CN103560687B - Modular multi-level converter system, and control system and control method - Google Patents

Modular multi-level converter system, and control system and control method Download PDF

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Publication number
CN103560687B
CN103560687B CN201310449735.8A CN201310449735A CN103560687B CN 103560687 B CN103560687 B CN 103560687B CN 201310449735 A CN201310449735 A CN 201310449735A CN 103560687 B CN103560687 B CN 103560687B
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current
brachium pontis
valve
signal
input
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CN103560687A (en
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邓明
吴强
张志学
唐剑钊
刘华东
谭胜武
何伯钧
秦灿华
梁文超
刘永丰
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Zhuzhou National Engineering Research Center of Converters Co Ltd
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Zhuzhou National Engineering Research Center of Converters Co Ltd
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Abstract

The invention discloses a kind of modular multi-level converter system, and control system and control method, PC control layer comprises operations staff's monitoring system, operations staff's monitoring system is connected with system control machine case. System-level key-course comprises system control machine case, and system control machine case is connected with valve control cabinet. Valve level key-course comprises valve control cabinet, and submodule start pulse signal is issued to submodule controller by valve control cabinet. Module level key-course comprises submodule controller, and submodule controller dispersed placement, in the submodule of modular multi-level converter valve, is controlled upper power model and the lower power model of submodule and opened and turn-off. The present invention is directed to the special control requirement of modular multi-level converter self, adopt the hierarchy of multi-control unit, realize the Comprehensive Control to whole modular multi-level converter from different control priority levels respectively, for the large-scale engineering applications of modular multi-level converter is had laid a good foundation.

Description

Modular multi-level converter system, and control system and control method
Technical field
The present invention relates to electric power Semiconductor Converting Technology field, especially relate to that one is widely used in flexible DC power transmission, static reacance is sent outModular multi-level converter (ModularMultilevelConverter, the MMC) system of the electric power applications such as raw device,And control system and control method.
Background technology
Siemens Company has proposed based on modular multi-level converter (ModularMultilevelConverter, MMC)(VoltageSourceConverterBasedHighVoltageDirectCurrent, based on voltage source for VSCHVDCThe D.C. high voltage transmission of current transformer) technology, and by its called after HVDCPLUS, as shown in Figure 1. Due to modularized designAnd manufacture, MMC can reach very high level number easily, and this is traditional multilevel converter, as diode clamp type and electricityAppearance clamper type current transformer is difficult to reach. So MMC level step is very little, there is good output characteristics, be also easy to structureBuild large capacity current transformer, claim to reach 1000MW according to the data of Siemens Company even larger. Can say that MMC is than traditionTwo level and three-level current transformer be more suitable for for high pressure, powerful direct current transportation field. Modular multi-level converter(ModularMultilevelConverter, MMC) adopted extensive submodule (Sub-Modular, SM) level because of itMany level structure of connection, can adapt to higher electric pressure and power requirement more neatly, defeated at flexible direct current gradually in recent yearsIn the electric power applications such as electricity, static reacance generator, be applied. The main circuit topological structure figure of modular multi-level converterAs shown in Figure 1, its basic circuit unit is also called submodule, and each brachium pontis is all to have a same structure by a certain amount ofSubmodule and a valve level reactor in series, only, by changing the number of submodule, just can change flexibly current transformerOutput voltage and power grade. In addition, by multiple identical submodules of connecting, the positive and negative dc bus of this topological structureCan be applicable to D.C. high voltage transmission occasion.
Technology of HVDC based Voltage Source Converter based on MMC, than traditional HVDC Transmission Technology, does not have the problem of commutation failure, Ke YishiThe quick decoupling zero control of existing merit, reactive power, harmonic content has also obtained reduction simultaneously. Therefore, VSC-HVDC is at electrical networkAsynchronous interconnected and electricity market support, distributed power generation is grid-connected, connects isolated minor scale power net and passive load, and to big cityThere is good application prospect the aspects such as central concentrated load power supply. And control system is one of core of whole current transformer, each to current transformerPlant the realization of function and the performance of advantage and play conclusive effect. Be different from conventional three-phase two level bridge architectures, diodeClamp or striding capacitance type three level topological structures, modular multi-level converter employing IGBT half-bridge and Capacitance parallel connectionThe topological structure of submodule cascade, level approaches modulation control, the control of submodule capacitance voltage balance, alternate brachium pontis circulation recentlyInhibitory controls etc. are himself distinctive control modes. In order to ensure the reliable and stable operation of modular multi-level converter, needDesign and configure control system for the control feature of modular multi-level converter self, making control system meet modularizationThe engineering application requirements of many level current transformers.
In the prior art, mainly contain following two sections of documents related to the present invention:
Document 1 is that Shandong University applied on 03 03rd, 2011, and open on 08 17th, 2011, and publication number isThe Chinese invention patent application " a kind of complex control system of modular multilevel converter and method thereof " of CN102158112A.As shown in Figure 2, this application for a patent for invention has proposed a kind of complex control system and method thereof of modular multilevel converter,By the each submodule capacitance voltage of upper and lower brachium pontis of detection module multi-level converter, upper and lower brachium pontis electric current, and exchangeSide supply voltage obtains the public dutycycle of upper and lower brachium pontis PWM after a master controller calculation process. Upper and lower brachium pontis is eachThe public dutycycle of submodule capacitance voltage and above-mentioned upper and lower brachium pontis PWM, through upper and lower brachium pontis controller calculation process, obtainsThe PWM dutycycle of the each submodule of upper and lower brachium pontis. The PWM dutycycle of each submodule produces each submodule through pwm signal generatorThe pwm control signal of piece, realizes electric current, the Control of Voltage of the balance control of the each submodule capacitance voltage of converter and converter. ButThat this application only have been introduced for the concrete control system of the bridge arm unit submodule of converter and implementation method, not from conversionThe system level such as device AC, DC side, digital quantity, analog quantity are described, simultaneously real with the control system of the present invention's propositionExisting mode difference, and function is not identical yet.
Zhejiang University's master thesis " modularization that the Shen Feifei that document 2 is Zhejiang University delivered on March 16th, 2012The research of many level current transformers control system ". This paper has proposed a kind of modular multi-level converter control system, this systemBe three grades of controller architectures, wherein master controller is the arithmetic core of MMC system, is mainly responsible for 6 brachium pontis electric currents and outputThe isoparametric sampling of voltage, algorithm control design, and man-machine interaction. Pilot controller uses FPGA to realize, and three-phase instituteSome submodules carry out interconnected, accept at each carrier cycle the information of voltage that each phase submodule sends back, and realize each phase brachium pontis electricityAll pressures of holding and the unified protection of module, the function of redundancy. Module controller is realized independence and the intellectuality of submodule,Accept the duty cycle information of host computer at each carrier cycle, for the generation of PWM. Meanwhile, return to host computer submoduleCapacitance voltage information and submodule status information. But the technical scheme of this paper and technical solution of the present invention are in signals collecting and realityExisting control function aspects has obvious difference.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of modular multi-level converter system, and control system and sideMethod, for the special control requirement of modular multi-level converter self, adopts the hierarchy of multi-control unit, respectively neverWith control priority level realizes the Comprehensive Control to whole modular multi-level converter, for modular multi-level converter greatlyThe application of scale engineering is had laid a good foundation.
In order to realize foregoing invention object, the present invention specifically provides a kind of technology of modular multi-level converter control system realExisting scheme, a kind of modular multi-level converter control system, modular multi-level converter comprises modular multi-level converterValve, described modular multi-level converter valve comprises upper and lower brachium pontis, described brachium pontis comprises submodule. Described control system bagDraw together: PC control layer, system-level key-course, valve level key-course and module level key-course;
Wherein, described PC control layer comprises operations staff's monitoring system, described operations staff's monitoring system and system control machineCase is connected, and realizes status monitoring, Long-distance Control to described modular multi-level converter, and described modular multilevel is becomeThe fault of stream device is reported to the police and is analyzed;
Described system-level key-course comprises system control machine case, and described system control machine case is realized voltage on line side signal, net side electricityThe collection of stream signal, voltage on valve side signal, current on valve side signal, valve side d. c. voltage signal and valve side DC current signal, instituteState system control machine case and be connected with valve control cabinet, described system control machine case receives by under described operations staff's monitoring system simultaneouslyThe control instruction of sending out, generates modulating wave by computing, and described modulating wave is issued to valve control cabinet;
Described valve level key-course comprises valve control cabinet, and described valve control cabinet is realized brachium pontis under brachium pontis current signal and valve on valveThe collection of current signal, described valve control cabinet receives the modulating wave that described system control machine case issues, and generates by computingSubmodule start pulse signal, and described submodule start pulse signal is issued to submodule controller;
Described module level key-course comprises submodule controller, and described submodule controller dispersed placement is in described modular multilevelIn the submodule of current transformer valve, described submodule controller receives the submodule start pulse signal that described valve control cabinet issues,And by the pulse distribution upper power model to described submodule and lower power model transmission driving signal respectively, thereby described in controllingThe opening and turn-offing of upper power model and lower power model.
Preferably, described system-level key-course also comprises voltage on line side signal gathering unit, current on line side signal gathering unit, straightStream voltage signal acquisition unit, current on valve side signal gathering unit, voltage on valve side signal gathering unit and DC current signal collectionUnit. Described voltage on line side signal gathering unit, current on line side signal gathering unit, d. c. voltage signal collecting unit, valve sideCurrent signal collecting unit, voltage on valve side signal gathering unit and DC current signal collecting unit all with described system control machine caseBe connected. Described voltage on line side signal gathering unit realizes voltage on line side signal Ua,Ub,UcA/D sampling, described current on line sideSignal gathering unit realizes current on line side signal Ia,Ib,IcA/D sampling, described d. c. voltage signal collecting unit is realized mouldMany level current transformers of blocking valve d. c. voltage signal UdcA/D sampling, described current on valve side signal gathering unit realizes valve sideCurrent signal I'a,I′b,I'cA/D sampling, described voltage on valve side signal gathering unit realizes voltage on valve side signal Va,Vb,VcA/DSampling, described DC current signal collecting unit is realized the anodal DC current signal of modular multi-level converter valveWith negativeUtmost point DC current signalA/D sampling.
Preferably, described modular multi-level converter comprises: net side breaker, voltage on line side transformer, current on line side mutual inductanceDevice, transformer, valve side breaker, charging breaker, charging resistor, voltage on valve side transformer, current on valve side transformer, straightStream voltage sensor, DC current sensor, direct-current isolating switch, DC current sensor, direct-current isolating switch and modularizationMany level current transformers valve. The input of described net side breaker is connected to three-phase alternating current electrical network, and the output of described net side breaker dividesBe not connected to the input of described voltage on line side transformer and described current on line side transformer, the output of described current on line side transformerBe connected to the former avris of described transformer, the secondary side of described transformer is connected to respectively described valve side breaker and described charging breakerInput, the output of described charging breaker is connected to the input of described charging resistor, the output of described charging resistor connectsBe connected to the output of described valve side breaker, the output of described valve side breaker be connected to respectively described voltage on valve side transformer withThe input of described current on valve side transformer, the output of described current on valve side transformer is connected to described modular multi-level converterThe three-phase input side of valve, is parallel with described direct current between the direct current output cathode of described modular multi-level converter valve and negative polePressure sensor, the direct current output cathode of described modular multi-level converter valve is also connected to the defeated of described DC current sensor oneEnter end, the output of described DC current sensor one is connected to the input of described direct-current isolating switch, described modular multilevelThe direct current output negative pole of current transformer valve is connected to the input of described DC current sensor two, described DC current sensor twoOutput is connected to the input of described direct-current isolating switch. Described voltage on line side transformer is realized voltage on line side signalUa,Ub,UcCollection, described current on line side transformer is realized current on line side signal Ia,Ib,IcCollection, described voltage on valve sideTransformer is realized voltage on valve side signal Va,Vb,VcCollection, described current on valve side transformer is realized current on valve side signalI'a,I′b,I'cCollection, described direct current voltage sensor is realized described modular multi-level converter valve d. c. voltage signal Udc'sGather, described DC current sensor one is realized respectively described modular multi-level converter with described DC current sensor twoThe anodal DC current signal of valveWith negative pole DC current signalMeasurement.
Preferably, described valve level key-course also comprises brachium pontis current signal collecting unit and lower brachium pontis current signal collecting unit,Described upper brachium pontis current signal collecting unit is all connected with described valve control cabinet with lower brachium pontis current signal collecting unit. On describedBrachium pontis current signal collecting unit is realized brachium pontis current signal I on valvea_u,Ib_u,Ic_uA/D sampling, described lower brachium pontis electric currentSignal gathering unit realizes brachium pontis current signal I under valvea_d,Ib_d,Ic_dA/D sampling.
Preferably, described modular multi-level converter valve comprises upper and lower totally six brachium pontis of three-phase, described brachium pontis comprise one orTwo above described submodules of series connection mutually. The input side that A goes up brachium pontis is mutually connected to the input of commutating reactor one, described inThe output of commutating reactor one is connected to the input of brachium pontis current sensor one, the output of described brachium pontis current sensor oneBe connected to described brachium pontis. The input side that B goes up brachium pontis is mutually connected to the input of commutating reactor three, described commutating reactor threeOutput is connected to the input of brachium pontis current sensor three, and the output of brachium pontis current sensor three is connected to described brachium pontis. CThe input side of going up mutually brachium pontis is connected to the input of commutating reactor five, and the output of described commutating reactor five is connected to brachium pontis electric currentThe input of sensor five, the output of described brachium pontis current sensor five is connected to described brachium pontis. Described A goes up the defeated of brachium pontis mutuallyGo out outlet side and the outlet side output in parallel that C goes up brachium pontis mutually that side, B go up brachium pontis mutually, form described modular multi-level converterThe DC voltage electrode of valve. A descends the input side of brachium pontis to be connected to the input of commutating reactor two, described commutating reactor two mutuallyOutput be connected to the input of brachium pontis current sensor two, the output of described brachium pontis current sensor two is connected to described bridgeArm. B descends the input side of brachium pontis to be connected to the input of commutating reactor four mutually, and the output of described commutating reactor four is connected toThe input of brachium pontis current sensor four, the output of described brachium pontis current sensor four is connected to described brachium pontis. C descends brachium pontis mutuallyInput side is connected to the input of commutating reactor, and the output of described commutating reactor six is connected to the input of brachium pontis current sensor sixEnd, the output of described brachium pontis current sensor six is connected to described brachium pontis. Described A descends the outlet side of brachium pontis, B to descend mutually brachium pontis mutuallyOutlet side and C descend mutually the outlet side output in parallel of brachium pontis, the DC voltage that forms described modular multi-level converter valve is negativeThe utmost point. Realize respectively A by described brachium pontis current sensor one, brachium pontis current sensor three and brachium pontis current sensor five and go up mutually bridgeArm electric current Ia_u, B goes up brachium pontis electric current I mutuallyb_uGo up mutually brachium pontis electric current I with Cc_uThe collection of signal, by described brachium pontis current senseDevice two, brachium pontis current sensor four and brachium pontis current sensor six are realized respectively A and are descended mutually brachium pontis electric current Ia_d, B descends brachium pontis electricity mutuallyStream Ib_dDescend mutually brachium pontis electric current I with Cc_dThe collection of signal.
Preferably, described module level key-course further comprises 6n sub-module controller, n >=1, described submodule controllerBe connected with described valve control cabinet, described submodule controller is also connected with described submodule. Described submodule adopts upper power mouldPiece and lower power model are composed in series half-bridge structure, and wherein, upper power model is made up of switching tube one and anti-paralleled diode one,Lower power model is made up of switching tube and anti-paralleled diode two. DC side storage capacitor, direct current voltage sensor and direct current are all pressedResistance is in parallel with described half-bridge structure, is parallel with by-pass switch at the two ends of described lower power model, described submodule controller withBetween described upper power model, be connected with power model drive plate, between described submodule controller and described lower power model, connectBe connected to lower power model drive plate, described submodule controller is sent out to described upper power model by described upper power model drive plateSend trigger impulse, described submodule controller is sent and triggers arteries and veins to described lower power model by described lower power model drive platePunching, described submodule controller receives the submodule DC voltage measurement signal U from described direct current voltage sensorc', described inDescribed in the control of submodule controller, by-pass switch opening and turn-offing.
Preferably, described voltage on line side signal gathering unit, current on line side signal gathering unit, d. c. voltage signal collection listUnit, current on valve side signal gathering unit, voltage on valve side signal gathering unit and DC current signal collecting unit are all believed by optical fiberNumber be connected with described system control machine case, between described operations staff's monitoring system and described system control machine case, enter by EthernetRow connects.
Preferably, described upper brachium pontis current signal collecting unit and lower brachium pontis current signal collecting unit are all by fiber-optic signal and instituteState valve control cabinet and be connected, between described system control machine case and described valve control cabinet, be connected by light signal.
Preferably, described submodule controller is connected with described valve control cabinet by fiber-optic signal, and described submodule controller is logicalCrossing fiber-optic signal is connected with described upper power model drive plate, described lower power model drive plate.
What preferably, described system control machine case reception was issued by described operations staff's monitoring system comprises DC voltage, wattful powerRate, reactive power, in interior control instruction, are controlled and are calculated by its inner corresponding DC voltage, active power, reactive power etc.Method module generates modulating wave, and described modulating wave is issued to described valve control cabinet.
Preferably, described valve control cabinet receives the modulating wave that described system control machine case issues, inner recently corresponding by itLevel approaches modulation algorithm module and submodule capacitance voltage balancing control algorithm module generates submodule start pulse signal, and willDescribed submodule start pulse signal is issued to corresponding 6n sub-module controller, n >=1 successively.
The present invention also specifically provides a kind of technic relization scheme of modular multi-level converter system in addition, and a kind of modularization is manyLevel current transformer system, comprising: modular multi-level converter and aforesaid modular multi-level converter control system, described inModular multi-level converter further comprises modular multi-level converter valve, and described modular multi-level converter valve is furtherComprise upper and lower brachium pontis, described brachium pontis further comprises submodule.
Preferably, described modular multi-level converter further comprises: net side breaker, voltage on line side transformer, net side electricityCurrent transformer, transformer, valve side breaker, charging breaker, charging resistor, voltage on valve side transformer, current on valve side mutual inductanceDevice, direct current voltage sensor, DC current sensor, direct-current isolating switch, DC current sensor, direct-current isolating switch andModular multi-level converter valve. The input of described net side breaker is connected to three-phase alternating current electrical network, described net side breaker defeatedGo out the input that end is connected to respectively described voltage on line side transformer and described current on line side transformer, described current on line side transformerOutput is connected to the former avris of described transformer, and the secondary side of described transformer is connected to respectively described valve side breaker and described chargingThe input of breaker, the output of described charging breaker is connected to the input of described charging resistor, described charging resistor defeatedGo out the output that end is connected to described valve side breaker, it is mutual that the output of described valve side breaker is connected to respectively described voltage on valve sideThe input of sensor and described current on valve side transformer, the output of described current on valve side transformer is connected to described modular multilevelThe three-phase input side of current transformer valve, described in being parallel with between the direct current output cathode of described modular multi-level converter valve and negative poleDirect current voltage sensor, the direct current output cathode of described modular multi-level converter valve is also connected to described DC current sensorOne input, the output of described DC current sensor one is connected to the input of described direct-current isolating switch, described modularizationThe direct current output negative pole of many level current transformers valve is connected to the input of described DC current sensor two, described DC current sensingThe output of device two is connected to the input of described direct-current isolating switch.
Preferably, described modular multi-level converter valve further comprises upper and lower totally six brachium pontis of three-phase, and described brachium pontis comprisesThe described submodule that one or more is connected mutually. The input side that A goes up brachium pontis is mutually connected to the input of commutating reactor one,The output of described commutating reactor one is connected to the input of brachium pontis current sensor one, described brachium pontis current sensor one defeatedGo out end and be connected to described brachium pontis. The input side that B goes up brachium pontis is mutually connected to the input of commutating reactor three, described commutating reactorThree output is connected to the input of brachium pontis current sensor three, and the output of brachium pontis current sensor three is connected to described bridgeArm. The input side that C goes up brachium pontis is mutually connected to the input of commutating reactor five, and the output of described commutating reactor five is connected to bridgeThe input of arm current sensor five, the output of described brachium pontis current sensor five is connected to described brachium pontis. Described A goes up bridge mutuallyThe outlet side of arm, outlet side and the C that B goes up brachium pontis mutually go up the outlet side output in parallel of brachium pontis mutually, form described modular multilevelThe DC voltage electrode of current transformer valve. A descends the input side of brachium pontis to be connected to the input of commutating reactor two, described commutation electricity mutuallyThe output of anti-device two is connected to the input of brachium pontis current sensor two, and the output of described brachium pontis current sensor two is connected toDescribed brachium pontis. B descends the input side of brachium pontis to be connected to the input of commutating reactor four, the output of described commutating reactor four mutuallyBe connected to the input of brachium pontis current sensor four, the output of described brachium pontis current sensor four is connected to described brachium pontis. C mutually underThe input side of brachium pontis is connected to the input of commutating reactor, and the output of described commutating reactor six is connected to brachium pontis current sensor sixInput, the output of described brachium pontis current sensor six is connected to described brachium pontis. Described A descends outlet side, the B phase of brachium pontis mutuallyThe outlet side of lower brachium pontis and in parallel output of outlet side that C descends brachium pontis mutually, form the direct current of described modular multi-level converter valvePress negative pole.
Preferably, described submodule adopts upper power model and lower power model to be composed in series half-bridge structure, wherein, and upper power mouldPiece is made up of switching tube one and anti-paralleled diode one, and lower power model is made up of switching tube and anti-paralleled diode two, DC sideStorage capacitor, direct current voltage sensor and direct current equalizing resistance are in parallel with described half-bridge structure, at the two ends of described lower power modelBe parallel with by-pass switch.
The present invention also specifically provides a kind of technology of the method that above-mentioned modular multi-level converter system is controlled real in additionExisting scheme, a kind of method that above-mentioned modular multi-level converter system is controlled, comprises the following steps:
Operations staff's monitoring system of described PC control layer is carried out status monitoring and long-range to described modular multi-level converterControl, issue control instruction to the system control machine case of described system-level key-course, and to described modular multi-level converterFault is reported to the police and is analyzed;
The system control machine case of described system-level key-course is to voltage on line side signal, current on line side signal, voltage on valve side signal, valveSide current signal, valve side d. c. voltage signal and valve side DC current signal gather, and described system control machine case receives simultaneouslyThe control instruction being issued by described operations staff's monitoring system, generates modulating wave by computing, and described modulating wave is issuedTo valve control cabinet;
The valve control cabinet of described valve level key-course gathers brachium pontis current signal under brachium pontis current signal and valve on valve, described inValve control cabinet receives the modulating wave that described system control machine case issues, and generates submodule start pulse signal by computing,And described submodule start pulse signal is issued to described submodule controller;
The submodule controller of described module level key-course receives the submodule start pulse signal that described valve control cabinet issues, andBy the pulse distribution upper power model to submodule and lower power model transmission driving signal respectively, thereby control described upper powerThe opening and turn-offing of module and lower power model.
What preferably, described system control machine case reception was issued by described operations staff's monitoring system comprises DC voltage, wattful powerRate, reactive power, in interior control instruction, are calculated and are processed generation modulating wave by DC voltage, active power, reactive power,And described modulating wave is issued to described valve control cabinet;
Described valve control cabinet receives the modulating wave that described system control machine case issues, and approaches modulation computing by nearest levelCalculate and generate submodule start pulse signal with the control of submodule capacitance voltage balance, and described submodule start pulse signal is complied withInferior corresponding 6n sub-module controller, n >=1 of being issued to.
The modular multi-level converter system providing by implementing the invention described above, and control system and control method, haveFollowing technique effect:
(1) control system of the present invention adopts hierarchy, controls step by step for every layer, controls function allocation more reasonable, can maximum limitDegree is brought into play the control efficiency of whole system, thereby realizes the optimal performance of modular multi-level converter;
(2) between every layer of control system of the present invention, adopt Ethernet or fibre circuit to connect, not only can effectively avoid because of electricConnect the electromagnetic interference producing, in addition due to the high-speed transfer speed of Ethernet and optical fiber, can greatly improve entirety controlledCan;
(3) in the present invention, the collection of all analog signalses all adopts the principle gathering nearby, and collection signal is passed through to light on the spotElectricity conversion, utilizes the mode of optical-fibre communications to realize the transmission of measuring-signal, can effectively avoid the electromagnetism producing because of electrical connection to doDisturb;
(4) each submodule controller dispersed placement of the present invention is in the submodule of MMC valve, only by a pair of fibre circuitRealize the effective control to each submodule.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or prior artIn description, the accompanying drawing of required use is briefly described, and apparently, the accompanying drawing in the following describes is only of the present invention oneA little embodiment, for those of ordinary skill in the art, are not paying under the prerequisite of creative work, can also be according to theseAccompanying drawing obtains other accompanying drawing.
Fig. 1 is the main circuit topological structure figure of prior art modular multi-level converter;
Fig. 2 is the complex control system of prior art modular multilevel converter and the system architecture diagram of method thereof;
Fig. 3 is the system architecture diagram of a kind of detailed description of the invention of modular multi-level converter control system of the present invention;
Fig. 4 is the main circuit of a kind of detailed description of the invention modular multi-level converter of modular multi-level converter system of the present inventionStructural topology figure;
Fig. 5 is the structure of a kind of detailed description of the invention modular multi-level converter of modular multi-level converter system of the present invention valveTopological diagram;
Fig. 6 is the structural topology figure of a kind of detailed description of the invention submodule of modular multi-level converter system of the present invention;
In figure: 1-PC control layer, the system-level key-course of 2-, 3-valve level key-course, 4-module level key-course, 5-modularizationMany level current transformers, 6-modular multi-level converter valve, 7-brachium pontis, 8-submodule, 9-submodule controller 10-moves peopleMember's monitoring system, 20-system control machine case, 21-voltage on line side signal gathering unit, 22-current on line side signal gathering unit,23-d. c. voltage signal collecting unit, 24-current on valve side signal gathering unit, 25-voltage on valve side signal gathering unit, 26-is straightStream current signal collecting unit, 30-valve control cabinet, the upper brachium pontis current signal of 31-collecting unit, brachium pontis current signal under 32-Collecting unit.
Detailed description of the invention
For quote and know for the purpose of, by the technical term hereinafter using, write a Chinese character in simplified form or abridge and be described below:
MMC:ModularMultilevelConverter, the abbreviation of modular multi-level converter;
SM:SubModular, the abbreviation of submodule;
IGBT:InsulatedGateBipolarTransistor, the abbreviation of insulated gate level bipolar transistor;
A/D: analog quantity/digital quantity conversion;
SCU:SystemControlUnit, the abbreviation of system control unit;
VCU:ValveControlUnit, the abbreviation of valve control unit, VCU.
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, attached below in conjunction with in the embodiment of the present inventionFigure, is clearly and completely described the technical scheme in the embodiment of the present invention, and obviously, described embodiment is only thisA part of embodiment of invention, instead of whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the artNot making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.
As shown in accompanying drawing 3 to 6, provide modular multi-level converter system of the present invention, and control system and control methodSpecific embodiment, below in conjunction with the drawings and specific embodiments, the invention will be further described.
The specific embodiment of the invention, for the special control requirement of modular multi-level converter self, has proposed a kind of modularization manyLevel current transformer control system, modular multi-level converter system and control method thereof based on this, this control system adopts manyThe hierarchy of control module, respectively from different control priority levels realize communication to whole modular multi-level converter,Analog measurement, switching value control and feedback, power control, the control of submodule capacitance voltage balance, nearest level approach modulationEtc. function, for the large-scale engineering applications of modular multi-level converter is had laid a good foundation.
A specific embodiment for modular multi-level converter system, comprising: modular multi-level converter 5 and modularization are manyLevel current transformer control system, modular multi-level converter 5 further comprises modular multi-level converter valve 6, modularizationMany level current transformers valve 6 further comprises upper and lower brachium pontis 7, and brachium pontis 7 further comprises submodule 8.
As shown in Figure 4, modular multi-level converter 5 further comprises: net side circuit breaker Q F1, voltage on line side transformerTV1, current on line side transformer TA1, transformer TM, valve side circuit breaker Q F2, charging circuit breaker Q F3, charging resistor R, valveSide voltage transformer TV2, current on valve side transformer TA2, direct current voltage sensor BV1, DC current sensor BC7, direct currentIsolating switch QS1, DC current sensor BC8, direct-current isolating switch QS2 and modular multi-level converter valve 6. Net side is disconnectedThe input of road device QF1 is connected to three-phase alternating current electrical network, and the output of net side circuit breaker Q F1 is connected to respectively voltage on line side transformer TV1With the input of current on line side transformer TA1, the output of current on line side transformer TA1 is connected to the former avris of transformer TM. BecomeThe secondary side of depressor TM is connected to respectively the input of valve side circuit breaker Q F2 and charging circuit breaker Q F3, and charging circuit breaker Q F3's is defeatedGo out to be connected to the input of charging resistor R, the output of charging resistor R is connected to the output of valve side circuit breaker Q F2, valve sideThe output of circuit breaker Q F2 is connected to respectively the input of voltage on valve side transformer TV2 and current on valve side transformer TA2, valve sideThe output of current transformer TA2 is connected to the three-phase input side of modular multi-level converter valve 6, modular multi-level converterThe direct current output cathode of valve 6+and negative pole-between be parallel with direct current voltage sensor BV1, modular multi-level converter valve 6Direct current output cathode+be also the connected to input of DC current sensor one BC7, the output termination of DC current sensor one BC7To the input of direct-current isolating switch QS1, the direct current output negative pole of modular multi-level converter valve 6-being connected to direct current spreadsThe input of sensor two BC8, the output of DC current sensor two BC8 is connected to the input of direct-current isolating switch QS2.
As shown in Figure 5, modular multi-level converter valve 6 further comprises upper and lower totally six brachium pontis 7 of three-phase, brachium pontis 7Comprise the submodule 8 that one or more is connected mutually. A goes up mutually brachium pontis and comprises submodule SM (1)～SM (n), A mutually underBrachium pontis comprises submodule SM (n+1)～SM (2n); B goes up mutually brachium pontis and comprises submodule SM (2n+1)～SM (3n), B mutually underBrachium pontis comprises submodule SM (3n+1)～SM (4n); C goes up mutually brachium pontis and comprises submodule SM (4n+1)～SM (5n), C phaseLower brachium pontis comprises submodule SM (5n+1)～SM (6n). The input side that A goes up brachium pontis is mutually connected to the defeated of commutating reactor one L1Enter end, the output of commutating reactor one L1 is connected to the input of brachium pontis current sensor one BC1, brachium pontis current sensor oneThe output of BC1 is connected to brachium pontis 7. The input side that B goes up brachium pontis is mutually connected to the input of commutating reactor three L3, commutation electricityThe output of anti-device three L3 is connected to the input of brachium pontis current sensor three BC3, the output of brachium pontis current sensor three BC3Be connected to brachium pontis 7. The input side that C goes up brachium pontis is mutually connected to the input of commutating reactor five L5, the output of commutating reactor five L5End is connected to the input of brachium pontis current sensor five BC5, and the output of brachium pontis current sensor five BC5 is connected to brachium pontis 7. AThe outlet side output in parallel of go up mutually the outlet side of brachium pontis, outlet side and C that B goes up brachium pontis mutually going up brachium pontis mutually, forms how electricity of modularizationThe DC voltage electrode of flat current transformer valve 6+. A descends the input side of brachium pontis to be connected to the input of commutating reactor two L2 mutually, changesThe output of phase reactor two L2 is connected to the input of brachium pontis current sensor two BC2, and brachium pontis current sensor two BC2's is defeatedGo out end and be connected to brachium pontis 7. B descends the input side of brachium pontis to be connected to the input of commutating reactor four L4, commutating reactor four L4 mutuallyOutput be connected to the input of brachium pontis current sensor four BC4, the output of brachium pontis current sensor four BC4 is connected to brachium pontis7. C descends the input side of brachium pontis to be connected to the input of commutating reactor L6 mutually, and the output of commutating reactor six L6 is connected to brachium pontis electricityThe input of flow sensor six BC6, the output of brachium pontis current sensor six BC6 is connected to brachium pontis 7. A descends the output of brachium pontis mutuallySide, B descend the outlet side of brachium pontis and in parallel output of outlet side that C descends brachium pontis mutually, formation modular multi-level converter valve 6 mutuallyDC voltage negative pole-.
As shown in Figure 6, submodule 8 adopts upper power model and lower power model to be composed in series half-bridge structure, wherein, and upper meritRate module is made up of switching tube one T1 and anti-paralleled diode one D1, and lower power model is by switch transistor T 2 and anti-paralleled diode twoD2 composition, DC side storage capacitor C, direct current voltage sensor BV and direct current equalizing resistance Rc are in parallel with half-bridge structure. UnderThe two ends of power model are parallel with by-pass switch K.
A kind of specific embodiment of modular multi-level converter control system as described in accompanying drawing 3, modular multi-level converter controlSystem processed adopts hierarchy, specifically comprises: PC control layer 1, system-level key-course 2, valve level key-course 3 and module levelKey-course 4;
PC control layer 1 further comprises operations staff's monitoring system 10, operations staff's monitoring system 10 and system control machineCase (SCU, SystemControlUnit, system control unit) 20 is connected, and realizes modular multi-level converter 5Status monitoring, Long-distance Control, and the fault of modular multi-level converter 5 is reported to the police and analyzed, operations staff monitors systemSystem 10 is the communication with system control machine case 20 by the realization of Ethernet connected mode;
System-level key-course 2 further comprises system control machine case 20, system control machine case 20 realize to voltage on line side signal,Adopting of current on line side signal, voltage on valve side signal, current on valve side signal, valve side d. c. voltage signal and valve side DC current signalCollection, the external interface of system control machine case 20 mainly comprises the input of analog measurement signals collecting, digital quantity input, switch controlThe output of system/other signals, with valve control cabinet (VCU, ValveControlUnit, valve control unit, VCU) 30 between optical fiberThe parts such as communication; System control machine case 20 is connected with valve control cabinet 30, and system control machine case 20 receives by operations staff simultaneouslyThe control instruction that monitoring system 10 issues, generates modulating wave by computing, and modulating wave is issued to valve control cabinet30；
Valve level key-course 3 further comprises valve control cabinet 30, and valve control cabinet 30 is realized brachium pontis current signal and valve on valveThe collection of lower brachium pontis current signal, the modulating wave that valve control cabinet 30 receiving system control cabinets 20 issue, by computingGenerate submodule start pulse signal, and submodule start pulse signal is issued to submodule controller 9;
Module level key-course 4 further comprises submodule controller 9, and submodule controller 9 dispersed placement are in modular multilevelIn the submodule 8 of current transformer valve 6, the submodule start pulse signal that submodule controller 9 receiving valve control cabinets 30 issue,And by the pulse distribution upper power model to submodule 8 and lower power model transmission driving signal respectively, thereby control upper powerThe opening and turn-offing of module and lower power model.
As a kind of exemplary embodiments of the present invention, system control machine case 20 receives the bag being issued by operations staff's monitoring system 10Draw together DC voltage, active power, reactive power in interior control instruction, by its inner corresponding DC voltage, wattful powerThe control algolithm such as rate, reactive power module generates modulating wave, and modulating wave is issued to valve control cabinet 30. Valve control cabinetThe modulating wave that 30 receiving system control cabinets 20 issue, approaches modulation algorithm module and son by its inner corresponding level recentlyModule capacitance balance of voltage control algolithm module generates submodule start pulse signal, and submodule start pulse signal is passed through to 6nOptical fiber is issued to corresponding 6n sub-module controller 9, n >=1 successively.
System-level key-course 2 also further comprises voltage on line side signal gathering unit 21, current on line side signal gathering unit 22, straightStream voltage signal acquisition unit 23, current on valve side signal gathering unit 24, voltage on valve side signal gathering unit 25 and DC currentSignal gathering unit 26. Voltage on line side signal gathering unit 21, current on line side signal gathering unit 22, d. c. voltage signal are adoptedCollection unit 23, current on valve side signal gathering unit 24, voltage on valve side signal gathering unit 25 and DC current signal collecting unit26 are all connected with system control machine case 20. Voltage on line side signal gathering unit 21 is triple channel analog quantity sampling structure, and it is right to realizeVoltage on line side signal Ua,Ub,UcA/D sampling, by utilizing a pair of optical fiber to be connected reality with system control machine case 20 after opto-electronic conversionThe input of existing network side voltage signal acquisition. Current on line side signal gathering unit 22 is triple channel analog quantity sampling structure, realizes net sideCurrent signal Ia,Ib,IcA/D sampling, by utilizing a pair of optical fiber to be connected and to realize net side with system control machine case 20 after opto-electronic conversionCurrent signal Gather and input. Voltage on valve side signal gathering unit 25 is triple channel analog quantity sampling structure, realizes voltage on valve side is believedNumber Va,Vb,VcA/D sampling, by utilizing a pair of optical fiber to be connected and to realize voltage on valve side with system control machine case 20 after opto-electronic conversionSignals collecting input. Current on valve side signal gathering unit 24 is triple channel analog quantity sampling structure, realizes current on valve side signalI'a,I′b,I'cA/D sampling, believe by utilizing a pair of optical fiber to be connected with system control machine case 20 after opto-electronic conversion to realize current on valve sideNumber Gather and input. D. c. voltage signal collecting unit 23 is single channel analog quantity sampling structure, realizes modular multilevel unsteady flowDevice valve d. c. voltage signal UdcA/D sampling, by utilizing a pair of optical fiber to be connected reality with system control machine case 20 after opto-electronic conversionExisting valve side d. c. voltage signal Gather and input. DC current signal collecting unit 26 is binary channels analog quantity sampling structure, and it is right to realizeThe anodal DC current signal of modular multi-level converter valve 6With negative pole DC current signalA/D sampling, by lightAfter electricity conversion, utilize a pair of optical fiber to be connected with system control machine case 20 and realize valve side DC current signal Gather and input. System-levelIn key-course 2, the digital quantity input signal of system control machine case 20 comprises net side circuit breaker Q F1, valve side circuit breaker Q F2, fillsHow electric the on off state feedback signal of electrical circuit breakers QF3, direct-current isolating switch QS1 and direct-current isolating switch QS2 and modularization beFlat current transformer 5 starts, stops, given input signal is controlled in reset, emergency shutdown etc., and switch control/other signals outputs compriseNet side circuit breaker Q F1, valve side circuit breaker Q F2, charging circuit breaker Q F3, direct-current isolating switch QS1 and direct-current isolating switch QS2Combined floodgate/separating brake control signal output, and other numeral letters of running status, the fault alarm etc. of modular multi-level converter 5Number output. As shown in Figure 4, voltage on line side transformer TV1 realizes voltage on line side signal Ua,Ub,UcCollection, net sideCurrent transformer TA1 realizes current on line side signal Ia,Ib,IcCollection, voltage on valve side transformer TV2 realize voltage on valve side is believedNumber Va,Vb,VcCollection, current on valve side transformer TA2 realizes current on valve side signal I'a,I′b,I'cCollection, DC voltage sensingDevice BV1 realizes modular multi-level converter valve 6 d. c. voltage signal UdcCollection, DC current sensor one BC7 withDC current sensor two BC8 realize respectively the anodal DC current signal of modular multi-level converter valve 6With negative pole direct currentCurrent signalMeasurement.
Valve level key-course 3 also further comprises brachium pontis current signal collecting unit 31 and lower brachium pontis current signal collecting unit 32,Upper brachium pontis current signal collecting unit 31 is all connected with valve control cabinet 30 with lower brachium pontis current signal collecting unit 32. Valve controlThe external interface of cabinet 30 mainly comprise analog measurement signals collecting input, and submodule controller between optical-fibre communications etc.Part. Upper brachium pontis current signal collecting unit 31 is triple channel analog quantity sampling structure, realizes brachium pontis current signal on valveIa_u,Ib_u,Ic_uA/D sampling, by utilizing a pair of optical fiber to be connected and to realize brachium pontis on valve with valve control cabinet 30 after opto-electronic conversionCurrent signal Gather and input. Lower brachium pontis current signal collecting unit 32 is triple channel analog quantity sampling structure, realizes brachium pontis under valveCurrent signal Ia_d,Ib_d,Ic_dA/D sampling, by utilizing a pair of optical fiber to be connected realization with valve control cabinet 30 after opto-electronic conversionBrachium pontis current signal Gather and input under valve. As shown in Figure 5, by brachium pontis current sensor one BC1, brachium pontis current senseDevice three BC3 realize respectively A with brachium pontis current sensor five BC5 and go up mutually brachium pontis electric current Ia_u, B goes up brachium pontis electric current I mutuallyb_uWith C phaseUpper brachium pontis electric current Ic_uThe collection of signal. By brachium pontis current sensor two BC2, brachium pontis current sensor four BC4 and brachium pontis electricityFlow sensor six BC6 realize respectively A and descend mutually brachium pontis electric current Ia_d, B descends brachium pontis electric current I mutuallyb_dDescend mutually brachium pontis electric current I with Cc_dLetterNumber collection.
Module level key-course 4 further comprises 6n sub-module controller 9, n >=1, submodule controller 9 and valve control cabinet30 are connected, and submodule controller 9 is also connected with submodule 8. As shown in Figure 6, submodule controller 9 and upper power mouldBetween piece, be connected with power model drive plate GU1, between submodule controller 9 and upper power model drive plate GU1, adopt oneFibre circuit is connected, between submodule controller 9 and lower power model, be connected with lower power model drive plate GU2, submoduleBetween controller 9 and lower power model drive plate GU2, adopt a pair of fibre circuit to be connected. Submodule controller 9 is by upper powerThe module drive plate GU1 upwards switch transistor T 1 of power model sends trigger impulse, and submodule controller 9 drives by lower power modelThe switch transistor T 2 of the moving downward power model of plate GU2 sends trigger impulse, and submodule controller 9 receives from direct current voltage sensorThe submodule DC voltage measurement signal U of BVc', submodule controller 9 is controlled opening and turn-offing of by-pass switch K. SubmoduleBetween controller 9 and valve control cabinet 30, adopt one group of fibre circuit to be connected, realize between submodule 8 and valve control cabinet 30Control be connected with communication.
Voltage on line side signal gathering unit 21, current on line side signal gathering unit 22, d. c. voltage signal collecting unit 23, valveSide current signal collecting unit 24, voltage on valve side signal gathering unit 25 and DC current signal collecting unit 26 all pass through optical fiberSignals & Systems control cabinet 20 is connected, and between operations staff's monitoring system 10 and system control machine case 20, is undertaken by EthernetConnect. Upper brachium pontis current signal collecting unit 31 and lower brachium pontis current signal collecting unit 32 are all by fiber-optic signal and valve controlCabinet 30 is connected, and between system control machine case 20 and valve control cabinet 30, is connected by light signal. Submodule controller9 are connected with valve control cabinet 30 by fiber-optic signal, and submodule controller 9 is by fiber-optic signal and upper power model drive plateGU1, lower power model drive plate GU2 are connected.
A specific embodiment for the method that above-mentioned modular multi-level converter control system is controlled, comprises the following steps:
Operations staff's monitoring system 10 of PC control layer 1 is carried out status monitoring and long-range control to modular multi-level converter 5System, issues control instruction to the system control machine case 20 of system-level key-course 2, and fault to modular multi-level converter 5Report to the police and analyze;
The system control machine case 20 of system-level key-course 2 is to voltage on line side signal, current on line side signal, voltage on valve side signal, valveSide current signal, valve side d. c. voltage signal and valve side DC current signal gather, and system control machine case 20 receives simultaneouslyThe control instruction being issued by operations staff's monitoring system 10, generates modulating wave by computing, and modulating wave is issued to valveControl cabinet 30;
The valve control cabinet 30 of valve level key-course 3 gathers brachium pontis current signal under brachium pontis current signal and valve on valve, valve controlThe modulating wave that cabinet 30 receiving system control cabinets 20 processed issue, generates submodule start pulse signal by computing, andSubmodule start pulse signal is issued to submodule controller 9;
The submodule start pulse signal that the submodule controller 9 receiving valve control cabinets 30 of module level key-course 4 issue, and logicalExtra pulse is distributed the upper power model to submodule 8 and lower power model transmission driving signal respectively, thereby controls upper power modelWith the opening and turn-offing of lower power model.
As a kind of typical embodiment of the present invention, system control machine case 20 receives the bag being issued by operations staff's monitoring system 10Draw together DC voltage, active power, reactive power in interior control instruction, by DC voltage, active power, wattless power meterCalculate and process generation modulating wave, and modulating wave is issued to valve control cabinet 30. Valve control cabinet 30 receiving system control cabinets 20The modulating wave issuing, approaches modulation computing and submodule capacitance voltage balance control calculating generation submodule by nearest levelStart pulse signal, and submodule start pulse signal is issued to corresponding 6n sub-module controller 9, n >=1 successively.
The control system that the specific embodiment of the invention is described adopts hierarchy, controls step by step, controls more adduction of function allocation for every layerReason, can bring into play to greatest extent the control efficiency of whole system, thereby realize the optimal performance of modular multi-level converter. OftenBetween layer control system, adopt Ethernet or fibre circuit to connect, not only can effectively avoid the electromagnetism producing because of electrical connectionDisturb, due to the high-speed transfer speed of Ethernet and optical fiber, can greatly improve overall control performance in addition. Meanwhile, all simulationsThe collection of amount signal all adopts the principle gathering nearby, and collection signal is passed through to opto-electronic conversion on the spot, utilizes the side of optical-fibre communicationsFormula realizes the transmission of measuring-signal, can effectively avoid the electromagnetic interference producing because of electrical connection. 9 points of each submodule controllersDistribution is placed in the submodule 8 of modular multi-level converter valve 6, only can realize each submodule by a pair of fibre circuitEffective control of piece 8. In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed isWith the difference of other embodiment, between each embodiment identical similar part mutually referring to.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction. Although thisInvention discloses as above with preferred embodiment, but not in order to limit the present invention. Any those of ordinary skill in the art,Do not depart from the situation of Spirit Essence of the present invention and technical scheme, all can utilize the method for above-mentioned announcement and technology contents to thisBright technical scheme is made many possible variations and modification, or is revised as the equivalent embodiment of equivalent variations. Therefore, every not de-From the content of technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, be equal toReplacement, equivalence change and modify, and all still belong in the scope of technical solution of the present invention protection.

Claims (17)

1. a modular multi-level converter control system, modular multi-level converter (5) comprises that modular multilevel becomesStream device valve (6), described modular multi-level converter valve (6) comprises upper and lower brachium pontis (7), described brachium pontis (7) comprisesSubmodule (8);
It is characterized in that, described control system comprises: PC control layer (1), system-level key-course (2), the control of valve levelLayer (3) and module level key-course (4);
Described PC control layer (1) comprises operations staff's monitoring system (10), described operations staff's monitoring system (10) withSystem control machine case (20) is connected, and realizes status monitoring, Long-distance Control to described modular multi-level converter (5), andThe fault of described modular multi-level converter (5) is reported to the police and analyzed;
Described system-level key-course (2) comprises system control machine case (20), and described system control machine case (20) is realized net sideVoltage signal, current on line side signal, voltage on valve side signal, current on valve side signal, valve side d. c. voltage signal and valve side direct currentThe collection of stream signal, described system control machine case (20) is connected with valve control cabinet (30), described system control machine case (20)Receive the control instruction being issued by described operations staff's monitoring system (10) simultaneously, generate modulating wave by computing, and willDescribed modulating wave is issued to valve control cabinet (30);
Described valve level key-course (3) comprises valve control cabinet (30), and described valve control cabinet (30) is realized brachium pontis electricity on valveThe collection of brachium pontis current signal under stream signal and valve, described valve control cabinet (30) receives under described system control machine case (20)The modulating wave of sending out, generates submodule start pulse signal by computing, and described submodule start pulse signal is issued toSubmodule controller (9);
Described module level key-course (4) comprises submodule controller (9), and described submodule controller (9) dispersed placement is in instituteState in the submodule (8) of modular multi-level converter valve (6), described submodule controller (9) receives described valve controllerThe submodule start pulse signal that case (30) issues, and by the pulse distribution upper power model to described submodule (8) respectivelySend and drive signal with lower power model, thereby control opening and turn-offing of described upper power model and lower power model.
2. a kind of modular multi-level converter control system according to claim 1, is characterized in that: described systemLevel key-course (2) also comprises voltage on line side signal gathering unit (21), current on line side signal gathering unit (22), direct currentPress signal gathering unit (23), current on valve side signal gathering unit (24), voltage on valve side signal gathering unit (25) and straightStream current signal collecting unit (26), described voltage on line side signal gathering unit (21), current on line side signal gathering unit (22),D. c. voltage signal collecting unit (23), current on valve side signal gathering unit (24), voltage on valve side signal gathering unit (25)All be connected with described system control machine case (20) with DC current signal collecting unit (26); Described voltage on line side signals collectingUnit (21) is realized voltage on line side signal Ua,Ub,UcA/D sampling, described current on line side signal gathering unit (22) is realNow to current on line side signal Ia,Ib,IcA/D sampling, described d. c. voltage signal collecting unit (23) is realized how electricity of modularizationFlat current transformer valve d. c. voltage signal UdcA/D sampling, described current on valve side signal gathering unit (24) realizes valve side electricityStream signal I'a,Ib',I'cA/D sampling, described voltage on valve side signal gathering unit (25) realizes voltage on valve side signal Va,Vb,Vc'sA/D sampling, described DC current signal collecting unit (26) is realized the anodal direct current of modular multi-level converter valve (6)Stream signalWith negative pole DC current signalA/D sampling.
3. a kind of modular multi-level converter control system according to claim 1 and 2, is characterized in that described mouldThe many level current transformers of blocking (5) comprising: net side breaker (QF1), voltage on line side transformer (TV1), current on line side mutual inductanceDevice (TA1), transformer (TM), valve side breaker (QF2), charging breaker (QF3), charging resistor (R), valveSide voltage transformer (TV2), current on valve side transformer (TA2), direct current voltage sensor one (BV1), DC current sensingDevice one (BC7), direct-current isolating switch one (QS1), DC current sensor two (BC8), direct-current isolating switch two (QS2)With modular multi-level converter valve (6); The input of described net side breaker (QF1) is connected to three-phase alternating current electrical network, described netThe output of side breaker (QF1) is connected to respectively described voltage on line side transformer (TV1) and described current on line side transformer (TA1)Input, the output of described current on line side transformer (TA1) is connected to the former avris of described transformer (TM), described transformationThe secondary side of device (TM) is connected to respectively the input of described valve side breaker (QF2) and described charging breaker (QF3), instituteThe output of stating charging breaker (QF3) is connected to the input of described charging resistor (R), the output of described charging resistor (R)End is connected to the output of described valve side breaker (QF2), and the output of described valve side breaker (QF2) is connected to respectively instituteState the input of voltage on valve side transformer (TV2) and described current on valve side transformer (TA2), described current on valve side transformer (TA2)Output be connected to the three-phase input side of described modular multi-level converter valve (6), described modular multi-level converter valve (6)Direct current output cathode (+) and negative pole (-) between be parallel with described direct current voltage sensor one (BV1), described modularization is manyThe direct current output cathode (+) of level current transformer valve (6) is also connected to the input of described DC current sensor one (BC7),The output of described DC current sensor one (BC7) is connected to the input of described direct-current isolating switch one (QS1), described mouldThe direct current output negative pole (-) of many level current transformers of blocking valve (6) is connected to the input of described DC current sensor two (BC8)End, the output of described DC current sensor two (BC8) is connected to the input of described direct-current isolating switch two (QS2);Described voltage on line side transformer (TV1) is realized voltage on line side signal Ua,Ub,UcCollection, described current on line side transformer (TA1)Realize current on line side signal Ia,Ib,IcCollection, described voltage on valve side transformer (TV2) is realized voltage on valve side signalVa,Vb,VcCollection, described current on valve side transformer (TA2) is realized current on valve side signal I'a,Ib',I'cCollection, described direct currentVoltage sensor one (BV1) is realized described modular multi-level converter valve (6) d. c. voltage signal UdcCollection, instituteStating DC current sensor one (BC7) realizes respectively described modular multilevel with described DC current sensor two (BC8)The anodal DC current signal of current transformer valve (6)With negative pole DC current signalMeasurement.
4. a kind of modular multi-level converter control system according to claim 3, is characterized in that: described valve levelKey-course (3) also comprises brachium pontis current signal collecting unit (31) and lower brachium pontis current signal collecting unit (32), described inUpper brachium pontis current signal collecting unit (31) and lower brachium pontis current signal collecting unit (32) all with described valve control cabinet (30)Be connected; Described upper brachium pontis current signal collecting unit (31) is realized brachium pontis current signal I on valvea_u,Ib_u,Ic_uA/D adoptSample, described lower brachium pontis current signal collecting unit (32) is realized brachium pontis current signal I under valvea_d,Ib_d,Ic_dA/D sampling.
5. a kind of modular multi-level converter control system according to claim 4, is characterized in that: described moduleChange many level current transformers valve (6) and comprise upper and lower totally six brachium pontis (7) of three-phase, described brachium pontis (7) comprise one or two withThe upper described submodule (8) of series connection mutually; The input side that A goes up brachium pontis is mutually connected to the input of commutating reactor one (L1),The output of described commutating reactor one (L1) is connected to the input of brachium pontis current sensor one (BC1), described brachium pontis electric currentThe output of sensor one (BC1) is connected to described brachium pontis (7); The input side that B goes up brachium pontis is mutually connected to commutating reactor three(L3) input, the output of described commutating reactor three (L3) is connected to the input of brachium pontis current sensor three (BC3)End, the output of brachium pontis current sensor three (BC3) is connected to described brachium pontis (7); The input side that C goes up brachium pontis is mutually connected to and changesThe input of phase reactor five (L5), the output of described commutating reactor five (L5) is connected to brachium pontis current sensor five (BC5)Input, the output of described brachium pontis current sensor five (BC5) is connected to described brachium pontis (7); Described A goes up brachium pontis mutuallyOutlet side, the outlet side output in parallel that outlet side and C that B goes up brachium pontis mutually go up brachium pontis mutually, form described modular multilevel and becomeThe DC voltage electrode (+) of stream device valve (6); A descends the input side of brachium pontis to be connected to the input of commutating reactor two (L2) mutuallyEnd, the output of described commutating reactor two (L2) is connected to the input of brachium pontis current sensor two (BC2), described brachium pontisThe output of current sensor two (BC2) is connected to described brachium pontis (7); B descends the input side of brachium pontis to be connected to commutating reactance mutuallyThe input of device four (L4), the output of described commutating reactor four (L4) is connected to brachium pontis current sensor four (BC4)Input, the output of described brachium pontis current sensor four (BC4) is connected to described brachium pontis (7); C descends the input side of brachium pontis mutuallyBe connected to the input of commutating reactor (L6), the output of described commutating reactor six (L6) is connected to brachium pontis current sensor six(BC6) input, the output of described brachium pontis current sensor six (BC6) is connected to described brachium pontis (7); Described A mutually underThe outlet side of brachium pontis, outlet side and the C that B descends brachium pontis mutually descend the output in parallel of the outlet side of brachium pontis mutually, how electricly form described modularizationThe DC voltage negative pole (-) of flat current transformer valve (6); By described brachium pontis current sensor one (BC1), brachium pontis current senseDevice three (BC3) is realized respectively A with brachium pontis current sensor five (BC5) and is gone up mutually brachium pontis electric current Ia_u, B goes up brachium pontis electric current I mutuallyb_uGo up mutually brachium pontis electric current I with Cc_uThe collection of signal, by described brachium pontis current sensor two (BC2), brachium pontis current sensor four(BC4) realize respectively A with brachium pontis current sensor six (BC6) and descend mutually brachium pontis electric current Ia_d, B descends brachium pontis electric current I mutuallyb_dAnd CDescend mutually brachium pontis electric current Ic_dThe collection of signal.
6. a kind of modular multi-level converter control system according to claim 5, is characterized in that: described moduleLevel key-course (4) comprises 6n sub-module controller (9), n >=1, described submodule controller (9) and described valve controlCabinet (30) is connected, and described submodule controller (9) is also connected with described submodule (8); Described submodule (8) adoptsUpper power model and lower power model are composed in series half-bridge structure, and wherein, upper power model is by switching tube one (T1) and inverse parallelDiode one (D1) composition, lower power model is made up of switching tube (T2) and anti-paralleled diode two (D2), DC side storageEnergy electric capacity (C), direct current voltage sensor (BV) and direct current equalizing resistance (Rc) are in parallel with described half-bridge structure, under describedThe two ends of power model are parallel with by-pass switch (K), between described submodule controller (9) and described upper power model, are connectedThere is upper power model drive plate (GU1), between described submodule controller (9) and described lower power model, be connected with lower powerModule drive plate (GU2), described submodule controller (9) by described upper power model drive plate (GU1) to described upper meritRate module sends trigger impulse, described submodule controller (9) by described lower power model drive plate (GU2) under describedPower model sends trigger impulse, and described submodule controller (9) receives the submodule from described direct current voltage sensor (BV)Piece DC voltage measurement signal Uc', described submodule controller (9) is controlled opening and turn-offing of described by-pass switch (K).
7. a kind of modular multi-level converter control system according to claim 6, is characterized in that: described net sideVoltage signal acquisition unit (21), current on line side signal gathering unit (22), d. c. voltage signal collecting unit (23),Current on valve side signal gathering unit (24), voltage on valve side signal gathering unit (25) and DC current signal collecting unit (26)All be connected with described system control machine case (20) by fiber-optic signal, described operations staff's monitoring system (10) and described systemControl between cabinet (20) and connect by Ethernet.
8. a kind of modular multi-level converter control system according to claim 7, is characterized in that: described upper bridgeArm current signal collecting unit (31) and lower brachium pontis current signal collecting unit (32) are all by fiber-optic signal and described valve controlCabinet (30) is connected, and between described system control machine case (20) and described valve control cabinet (30), is undertaken by light signalConnect.
9. a kind of modular multi-level converter control system according to claim 8, is characterized in that: described submoduleBlock controller (9) is connected with described valve control cabinet (30) by fiber-optic signal, and described submodule controller (9) passes through lightOptical fiber signaling is connected with described upper power model drive plate (GU1), described lower power model drive plate (GU2).
10. according to a kind of modular multi-level converter control described in arbitrary claim in claim 1,2,4,5,6-9System processed, is characterized in that: described system control machine case (20) reception is issued by described operations staff's monitoring system (10)Control instruction including DC voltage, active power, reactive power, by its inner corresponding DC voltage, wattful powerThe control algolithm such as rate, reactive power module generates modulating wave, and described modulating wave is issued to described valve control cabinet (30).
11. a kind of modular multi-level converter control systems according to claim 10, is characterized in that: described valveControl cabinet (30) and receive the modulating wave that described system control machine case (20) issues, force by its inner corresponding level recentlyNearly modulation algorithm module and submodule capacitance voltage balancing control algorithm module generate submodule start pulse signal, and by described sonModule start pulse signal is issued to corresponding 6n sub-module controller (9), n >=1 successively.
12. 1 kinds of modular multi-level converter systems, is characterized in that, comprising: modular multi-level converter (5) and asModular multi-level converter control system in claim 1 to 11 described in arbitrary claim, described modular multilevel becomesStream device (5) further comprises modular multi-level converter valve (6), and described modular multi-level converter valve (6) is furtherComprise upper and lower brachium pontis (7), described brachium pontis (7) further comprises submodule (8).
13. a kind of modular multi-level converter systems according to claim 12, is characterized in that, described modularization is manyLevel current transformer (5) further comprises: net side breaker (QF1), voltage on line side transformer (TV1), current on line side mutual inductanceDevice (TA1), transformer (TM), valve side breaker (QF2), charging breaker (QF3), charging resistor (R), valveSide voltage transformer (TV2), current on valve side transformer (TA2), direct current voltage sensor one (BV1), DC current sensingDevice one (BC7), direct-current isolating switch one (QS1), DC current sensor two (BC8), direct-current isolating switch two (QS2)With modular multi-level converter valve (6); The input of described net side breaker (QF1) is connected to three-phase alternating current electrical network, described netThe output of side breaker (QF1) is connected to respectively described voltage on line side transformer (TV1) and described current on line side transformer (TA1)Input, the output of described current on line side transformer (TA1) is connected to the former avris of described transformer (TM), described transformationThe secondary side of device (TM) is connected to respectively the input of described valve side breaker (QF2) and described charging breaker (QF3), instituteThe output of stating charging breaker (QF3) is connected to the input of described charging resistor (R), the output of described charging resistor (R)End is connected to the output of described valve side breaker (QF2), and the output of described valve side breaker (QF2) is connected to respectively instituteState the input of voltage on valve side transformer (TV2) and described current on valve side transformer (TA2), described current on valve side transformer (TA2)Output be connected to the three-phase input side of described modular multi-level converter valve (6), described modular multi-level converter valve (6)Direct current output cathode (+) and negative pole (-) between be parallel with described direct current voltage sensor one (BV1), described modularization is manyThe direct current output cathode (+) of level current transformer valve (6) is also connected to the input of described DC current sensor one (BC7),The output of described DC current sensor one (BC7) is connected to the input of described direct-current isolating switch one (QS1), described mouldThe direct current output negative pole (-) of many level current transformers of blocking valve (6) is connected to the input of described DC current sensor two (BC8)End, the output of described DC current sensor two (BC8) is connected to the input of described direct-current isolating switch two (QS2).
14. according to a kind of modular multi-level converter system described in claim 12 or 13, it is characterized in that: described mouldMany level current transformers of blocking valve (6) further comprises upper and lower totally six brachium pontis (7) of three-phase, and described brachium pontis (7) comprises oneOr two above described submodules (8) of series connection mutually; The input side that A goes up brachium pontis is mutually connected to commutating reactor one (L1)Input, the output of described commutating reactor one (L1) is connected to the input of brachium pontis current sensor one (BC1), described inThe output of brachium pontis current sensor one (BC1) is connected to described brachium pontis (7); The input side that B goes up brachium pontis is mutually connected to commutationThe input of reactor three (L3), the output of described commutating reactor three (L3) is connected to brachium pontis current sensor three (BC3)Input, the output of brachium pontis current sensor three (BC3) is connected to described brachium pontis (7); C goes up the input side of brachium pontis mutuallyBe connected to the input of commutating reactor five (L5), the output of described commutating reactor five (L5) is connected to brachium pontis current senseThe input of device five (BC5), the output of described brachium pontis current sensor five (BC5) is connected to described brachium pontis (7); DescribedThe outlet side output in parallel that A goes up the outlet side of brachium pontis mutually, outlet side and C that B goes up brachium pontis mutually go up brachium pontis mutually, forms described modularizationThe DC voltage electrode (+) of many level current transformers valve (6); A descends the input side of brachium pontis to be connected to commutating reactor two (L2) mutuallyInput, the output of described commutating reactor two (L2) is connected to the input of brachium pontis current sensor two (BC2), instituteThe output of stating brachium pontis current sensor two (BC2) is connected to described brachium pontis (7); B descends mutually the input side of brachium pontis to be connected to and changesThe input of phase reactor four (L4), the output of described commutating reactor four (L4) is connected to brachium pontis current sensor four (BC4)Input, the output of described brachium pontis current sensor four (BC4) is connected to described brachium pontis (7); C descends the input of brachium pontis mutuallySide joint is to the input of commutating reactor (L6), and the output of described commutating reactor six (L6) is connected to brachium pontis current sensorThe input of six (BC6), the output of described brachium pontis current sensor six (BC6) is connected to described brachium pontis (7); Described A phaseThe outlet side of lower brachium pontis, outlet side and the C that B descends brachium pontis mutually descend the output in parallel of the outlet side of brachium pontis mutually, form described modularization manyThe DC voltage negative pole (-) of level current transformer valve (6).
15. a kind of modular multi-level converter systems according to claim 14, is characterized in that: described submodule (8)In employing, power model and lower power model are composed in series half-bridge structure, and wherein, upper power model is by switching tube one (T1) and anti-Parallel diode one (D1) composition, lower power model is made up of switching tube (T2) and anti-paralleled diode two (D2), direct currentSide storage capacitor (C), direct current voltage sensor (BV) and direct current equalizing resistance (Rc) are in parallel with described half-bridge structure, in instituteThe two ends of stating lower power model are parallel with by-pass switch (K).
16. 1 kinds the modular multi-level converter system described in arbitrary claim in claim 12-15 controlledMethod, is characterized in that, comprises the following steps:
Operations staff's monitoring system (10) of described PC control layer (1) is entered described modular multi-level converter (5)Row status monitoring and Long-distance Control, issue control instruction to the system control machine case (20) of described system-level key-course (2), andThe fault of described modular multi-level converter (5) is reported to the police and analyzed;
The system control machine case (20) of described system-level key-course (2) is to voltage on line side signal, current on line side signal, valve side electricityPress signal, current on valve side signal, valve side d. c. voltage signal and valve side DC current signal to gather, described system control machineCase (20) receives the control instruction being issued by described operations staff's monitoring system (10) simultaneously, generates modulation by computingRipple, and described modulating wave is issued to valve control cabinet (30);
The valve control cabinet (30) of described valve level key-course (3) carries out brachium pontis current signal under brachium pontis current signal and valve on valveGather, described valve control cabinet (30) receives the modulating wave that described system control machine case (20) issues, and gives birth to by computingBecome submodule start pulse signal, and described submodule start pulse signal is issued to described submodule controller (9);
The submodule controller (9) of described module level key-course (4) receives the submodule that described valve control cabinet (30) issuesStart pulse signal, and by the pulse distribution upper power model to submodule (8) and lower power model transmission driving letter respectivelyNumber, thereby control opening and turn-offing of described upper power model and lower power model.
17. methods according to claim 16, is characterized in that:
What described system control machine case (20) reception was issued by described operations staff's monitoring system (10) comprises DC voltage, hasMerit power, reactive power, in interior control instruction, are calculated to process to generate by DC voltage, active power, reactive power and are modulatedRipple, and described modulating wave is issued to described valve control cabinet (30);
Described valve control cabinet (30) receives the modulating wave that described system control machine case (20) issues, and approaches by nearest levelModulation computing and the control of submodule capacitance voltage balance are calculated and are generated submodule start pulse signal, and described submodule is touchedSend out pulse signal and be issued to successively corresponding 6n sub-module controller (9), n >=1.
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