CN103368196B - Chain-type variable direct-current simulation source and high-voltage energy storage converter all-in-one machine and control system - Google Patents
Chain-type variable direct-current simulation source and high-voltage energy storage converter all-in-one machine and control system Download PDFInfo
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- CN103368196B CN103368196B CN201310327112.3A CN201310327112A CN103368196B CN 103368196 B CN103368196 B CN 103368196B CN 201310327112 A CN201310327112 A CN 201310327112A CN 103368196 B CN103368196 B CN 103368196B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a chain-type variable direct-current simulation source and high-voltage energy storage converter all-in-one machine and a control system. The all-in-one machine comprises a multi-winding phase shifting transformer and 3N power units, wherein N is a positive integer, every N power units are serially connected together to form one phase, the three phases are connected together in a star form, and three led-out high-voltage output ends have access to an electric network through grid-connected electric reactors; the 3N power units comprise m energy storage units and n simulation units, m+n is equal to 3N, both m and n are natural numbers, and each energy storage unit comprises a first H-bridge power module and an energy storage battery; each simulation unit comprises a second H-bridge power module and a battery simulation device. The control system comprises a sampling processing unit, a central data processor, a PWM (pulse width modulation) signal generation circuit, an optical-fiber communication drive circuit, a human-machine interface and 3N unit controllers. By adopting the chain-type variable direct-current simulation source and high-voltage energy storage converter all-in-one machine and the control system, the mass detection on the working characteristics of the energy storage batteries can be realized, the enterprise investment can be greatly reduced, and an experimental platform for verifying the control strategy and especially the internal-phase and inter-phase balance characteristics of a high-voltage energy storage converter can be provided.
Description
Technical field
The present invention relates to electric power system technical field of energy storage, be specifically related to a kind of chain type variable dc dummy source and high-voltage energy storage converter all-in-one and control system, for the simulation of energy-storage battery and the checking to high-voltage energy storage system control strategy.
Background technology
Along with the exhaustion of traditional energy and going from bad to worse of environment, regenerative resource is applied widely.The regenerative resource such as photovoltaic, wind-powered electricity generation is subject to the restriction of himself intrinsic fluctuation and intermittent feature, after large-scale grid connection, can bring the problem of output-power fluctuation, the serious threat stable operation of electrical network.Battery energy storage technology can the power stage of effectively level and smooth grid-connected power generation system, improve the fail safe of electric power system, reliability, but the large-scale application of battery energy storage system is at least faced with following two hang-ups:
One is that energy-storage battery price is high, and extensive battery pack integrated technology difficulty is large, and project development construction cost is high.High-voltage energy storage converter according to a set of corresponding energy-storage battery of power requirement coupling, greatly can increase R&D costs and the initial stage design risk of enterprise, will cause the significant waste of social resources once make mistakes in R&D process.In addition, energy-storage battery needs to test tens of parameters such as cell voltage, capacity, internal resistance, charging/discharging voltage current characteristicss before use, the DC power supply charging generally adopted at present, resistance-type charging method can allow a large amount of electric energy conversion be heat energy and consume in vain, along with the large-scale application of energy-storage battery, this energy waste problem highlights more.Need exploitation one not only energy-conservation but also mass battery check device efficiently badly, and at the initial stage of development of energy storage project, the structure of converter and the innovation of algorithm can be carried out by replacement device simulated battery characteristic.
Two is lack the checking means for Large-scale High-Pressure energy-storage system control strategy.Large-scale energy storage system is applied, in order to improve overall efficiency, inevitable to high-pressure trend development, how effectively to control energy flow in the group of energy-storage battery, between group, checking high-voltage energy storage converter mutually in, alternate equalization problem, become among in the weight that converter design and control strategy study.
Summary of the invention
The object of the present invention is to provide a kind of chain type variable dc dummy source and high-voltage energy storage converter all-in-one, the operating characteristic of energy-storage battery can be detected mass, reduce power consumption, by coordinating of battery simulating device and actual energy-storage battery, reduce experiment investment and floor space, be a kind of ideal checking high-voltage energy storage convertor controls strategy especially mutually in, the experiment porch of alternate equalization characteristic.Meanwhile, provide the control system of this all-in-one, to control effectively to all-in-one, improve its efficiency and value further.
The technical scheme realizing above-mentioned purpose is:
A kind of chain type variable dc dummy source of one of the present invention and high-voltage energy storage converter all-in-one, outside electric power network and grid-connected reactor, described all-in-one comprises Multiple coil phase shifting transformer and 3N power cell, and N is positive integer, wherein:
Described electrical network is accessed on the former limit of described Multiple coil phase shifting transformer;
Every N number of power unit cascade forms a phase, the star-like connection of three-phase, and three high-voltage output ends of extraction access described electrical network through described grid-connected reactor;
A described 3N power cell comprises m energy-storage units and n analogue unit, m+n=3N and m, n are natural number, wherein:
Each energy-storage units comprises in parallel H bridge power model and an energy-storage battery, and this energy-storage units is connected by two outputs of the H bridge power model in it energy-storage units adjacent with homophase or analogue unit;
Each analogue unit comprises the 2nd in parallel H bridge power model and battery simulating device, and this analogue unit is connected by two outputs of the 2nd H bridge power model in it energy-storage units adjacent with homophase or analogue unit; Described battery simulating device comprises reactor, PWM(pulse width modulation) rectifier, DC capacitor and terminal, wherein:
One end of described reactor connects one group of secondary winding of described Multiple coil phase shifting transformer, and the other end connects the input of described PWM rectifier;
Described PWM rectifier, DC capacitor and terminal all with described 2nd H bridge power module parallel.
Above-mentioned chain type variable dc dummy source and high-voltage energy storage converter all-in-one, wherein, a described H bridge power model is identical with the 2nd H bridge power module architectures, comprises the switching device of four band anti-paralleled diodes, and the branch road that every two switching devices series connection is formed is parallel with one another; The series connection end of two switching devices be in series is as an output.
Above-mentioned chain type variable dc dummy source and high-voltage energy storage converter all-in-one, wherein, described each energy-storage units also comprises resistance, switch and electric capacity, wherein:
One end of described energy-storage battery connects an input of a described H bridge power model by described resistance, the other end of energy-storage battery connects another input of a described H bridge power model;
Described switch and described resistor coupled in parallel;
Described electric capacity and a described H bridge power module parallel.
Above-mentioned chain type variable dc dummy source and high-voltage energy storage converter all-in-one, wherein, described energy-storage battery is lithium battery, flow battery, sodium-sulphur battery, lead-acid battery or ultracapacitor.
The chain type variable dc dummy source based on one of the present invention of the present invention two and the control system of high-voltage energy storage converter all-in-one, comprise sample processing unit, central data processor, pwm signal generative circuit, optical-fibre communications drive circuit, man-machine interface and with each power cell 3N cell controller one to one, wherein:
Described sample processing unit sampling line voltage and input current information, and after carrying out the digitized process of discretization, export to described central data processor;
Described central data processor, to the data message analytical calculation received, controls described pwm signal generative circuit and generates pwm pulse control signal needed for each power cell, and pass to described optical-fibre communications drive circuit;
Described optical-fibre communications drive circuit is sent to described unit controller by after each pwm pulse control signal coded treatment received through optical fiber;
Each cell controller, the pwm pulse control signal according to receiving controls corresponding power unit, meanwhile, the work state information of corresponding power cell is fed back to described central data processor;
Described man-machine interface connects described central data processor, for man-machine interaction.
The invention has the beneficial effects as follows: the present invention is charged by the battery simulating device simulated battery of analogue unit, discharged and energy storage characteristic, test and the job information of energy-storage units battery pack under being captured in identical operating state, just can the carrying out of mass be detected by the quantity increasing energy-storage units, reduce power consumption, and by series connection outlet side by energy-feedback power grid, comparatively energy-conserving and environment-protective.Simultaneously, because energy-storage battery cost and floor space are all far above analogue means, the external behavior of multiple energy-storage battery is simulated by battery simulating device, battery investment can be greatly reduced, reduction initial stage design risk, is convenient to verify high-voltage energy storage converter interior mutually, alternate equalization characteristic operationally.Meanwhile, control system provided by the invention effectively can control all-in-one, thus further increases efficiency and the value of all-in-one.
Accompanying drawing explanation
Fig. 1 is the structural representation of chain type variable dc dummy source of the present invention and high-voltage energy storage converter all-in-one;
Fig. 2 is the electrical block diagram of energy-storage units in the present invention;
Fig. 3 is the electrical block diagram of analogue unit in the present invention;
Fig. 4 is that all-in-one of the present invention and control system are in the structural representation of high-voltage fence;
Fig. 5 is the series connection principle schematic of all-in-one of the present invention under 6kV high-voltage fence.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Refer to Fig. 1, Fig. 2 and Fig. 3, the chain type variable dc dummy source of one of the present invention and high-voltage energy storage converter all-in-one, comprise Multiple coil phase shifting transformer 11 and 3N power cell, N is positive integer, wherein:
The former limit 12 of Multiple coil phase shifting transformer 11 is as the high voltage input terminal access electrical network 7 of all-in-one; Every N number of power cell (A1-AN, B1-BN or C1-CN) phase in series, the star-like connection of three-phase, three high-voltage output ends A, B, C of extraction, as the output of all-in-one, access electrical network 7 through grid-connected reactor 6;
3N power cell comprises m energy-storage units 15 and n analogue unit 14, m+n=3N and m, n are natural number, concrete number of unit is optimized configuration according to the test purpose of all-in-one, such as, for the operating mode of batch testing energy-storage battery operating characteristic, then increase the quantity of energy-storage units 15; During in order to verify high-voltage energy storage convertor controls strategy, then increase the quantity of analogue unit 14; Wherein:
Each energy-storage units 15 comprises in parallel H bridge power model 21 and an energy-storage battery E, and this energy-storage units E is connected by two outputs of the H bridge power model 21 in it energy-storage units 15 adjacent with homophase or analogue unit 14; One H bridge power model 21 comprises the switching device S of four band anti-paralleled diodes
1-S4, switching device can be IGBT, thyristor or high-power MOSFET constant power semiconductor device; Every two switching device (S
1and S
3, S
2and S
4) branch road that formed of series connection is parallel with one another, the two ends of this parallel branch are as two inputs of a H bridge power model 21; Two the switching device (S be in series
1and S
3, S
2and S
4) series connection end as an output, that is: switching device S
1with switching device S
2common port, and switching device S
3with switching device S
4common port as this energy-storage units 15 and the extraneous port carrying out energy exchange, connect with homophase adjacent cells; In the present embodiment, energy-storage units 15 also comprises resistance R, K switch and electric capacity C1, wherein: one end of energy-storage battery E connects an input of a H bridge power model 21 by resistance R, the other end of energy-storage battery E connects another input of a H bridge power model 21; K switch is in parallel with resistance R; Electric capacity C1 is in parallel with a H bridge power model 21, between two inputs being namely connected on a H bridge power model 21; When energy-storage battery E is in charged state, electric current is through S
1anti-also diode, resistance R, energy-storage battery E anode, negative terminal, S
4anti-also diode (or through S
2anti-also diode, resistance R, energy-storage battery E anode, negative terminal, S
3anti-also diode) store energy in energy-storage battery E; When energy-storage battery E is in discharge condition, electric current is through S
3, energy-storage battery E negative terminal, anode, K switch, S
2(or through S
4, energy-storage battery E negative terminal, anode, K switch, S
1) will store fault offset;
Each analogue unit 14 comprises the 2nd in parallel H bridge power model 33 and battery simulating device, and this analogue unit 14 is connected by two outputs of the 2nd H bridge power model 33 in it energy-storage units 15 adjacent with homophase or analogue unit 14; Battery simulating device comprises reactor 34, PWM rectifier 31, DC capacitor C and terminal 321; One end of reactor 34 connects one group of secondary winding 13 of Multiple coil phase shifting transformer 11, and the other end connects the input of PWM rectifier 31; PWM rectifier 31, DC capacitor C and terminal 321 are all in parallel with the 2nd H bridge power model 33; PWM rectifier 31 comprises the switching device (S of six band anti-paralleled diodes
30, S
35, S
36, S
37, S
38and S
39), specifically as shown in Figure 3; Analogue unit 14 is ac-dc-ac transform circuit, the three-phase PWM rectification circuit that the first order is made up of reactor 34 and PWM rectifier 31, the DC capacitor module 32 that the second level is made up of DC capacitor C and the terminal 321 for drawing direct voltage Vdc, the third level is the 2nd H bridge power model 33,2nd H bridge power model 33 is identical with the structure of a H bridge power model 21, also comprises four switching device (S
31, S
32, S
33and S
34), as shown in Figure 3; The first order three-phase PWM rectification circuit of analogue unit 14 can four quadrant running, the operating characteristic such as voltage, electricity of all kinds of energy-storage battery is simulated by PWM rectifier 31, and output dc voltage size between 700-1100V is adjustable, realize to coordinate the strategy of high-voltage energy storage converter.Concrete output voltage will match with the voltage of energy-storage battery, also will adapt from different voltage on line side (as 6kV or 10kV); As shown in Figure 3, in the present embodiment, when being in simulation energy-storage battery discharge condition, receive 6 switching device S that 6 roads high-frequency PWM pulse (being produced by control device) control PWM rectifier 31
35, S
36, S
37, S
38, S
39, S
30, with reactor 34 acting in conjunction, produce the sinusoidal current waveform consistent with input voltage phase, now, circuit working is at first and third quadrant, and energy flows from left to right, feeds back electrical network through the 2nd H bridge power model 33; When being in simulation energy-storage battery charged state, PWM rectifier 31 input voltage is contrary with the sense of current, circuit working second, four-quadrant, reactor 34 pairs of electric current smothing filterings, energy by grid-connected reactor 6 through the 2nd H bridge power model
33 flow from right to left.
Energy-storage battery E is the electrochemical energy storage cell such as lithium battery, flow battery, sodium-sulphur battery, lead-acid battery or ultracapacitor.Because each energy-storage units 15 is separate, the energy-storage battery type of different energy-storage units 15 can be different, and the battery simulating device of analogue unit 14 can be simulated according to the feature of dissimilar energy-storage battery.
Refer to Fig. 4, the control system based on the described all-in-one of one of the present invention of the present invention two, comprise sample processing unit 421, central data processor 422, pwm signal generative circuit 423, optical-fibre communications drive circuit 424, man-machine interface 425 and with each power cell 3N cell controller 426 one to one, wherein:
Sample processing unit 421 is sampled line voltage and input current information, and after carrying out the digitized process of discretization, exports to central data processor 422;
Central data processor 422 is to the data message analytical calculation received, and control pwm signal generative circuit 423 generates the pwm pulse control signal needed for each power cell, and passes to optical-fibre communications drive circuit 424;
Optical-fibre communications drive circuit 424 is sent to unit controller 426 by after each pwm pulse control signal coded treatment received through optical fiber;
Each cell controller 426 controls corresponding power unit according to the pwm pulse control signal received, and meanwhile, the work state information of corresponding power cell is fed back to central data processor 422;
Man-machine interface 425 connects central data processor 422, for man-machine interaction, namely carries out the control operation of some systems and the running status of inquiry system.
Refer to Fig. 5, the series connection principle schematic of all-in-one of the present invention under 6kV high-voltage fence, each unit H bridge power model 21 or 33 inverter output voltage is 430V, every facies unit number N=8, then phase voltage of connecting is 3440V, and line voltage reaches 6000V.In like manner, when all-in-one works in 10kV high-voltage fence, control every unit H bridge power model 21 or 33 output voltage 480V, every facies unit number N gets 12, then can meet the application of system under 10kV electrical network.Citing is herein not limit this all-in-one only to run under these two kinds of operating modes, and in fact this chain structure can be adapted to the application under 1-500kV electrical network.Described two kinds of power cells all have modular design feature, are convenient to manufacture and install.When needs change electric pressure or change power system capacity, only need corresponding increase and decrease series unit number.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, various conversion or modification can also be made, therefore all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (5)
1. chain type variable dc dummy source and a high-voltage energy storage converter all-in-one, outside electric power network and grid-connected reactor, is characterized in that, described all-in-one comprises Multiple coil phase shifting transformer and 3N power cell, and N is positive integer, wherein:
Described electrical network is accessed on the former limit of described Multiple coil phase shifting transformer;
Every N number of power unit cascade forms a phase, the star-like connection of three-phase, and three high-voltage output ends of extraction access described electrical network through described grid-connected reactor;
A described 3N power cell comprises m energy-storage units and n analogue unit, m+n=3N and m, n are natural number, wherein:
Each energy-storage units comprises in parallel H bridge power model and an energy-storage battery, and this energy-storage units is connected by two outputs of the H bridge power model in it energy-storage units adjacent with homophase or analogue unit;
Each analogue unit comprises the 2nd in parallel H bridge power model and battery simulating device, and this analogue unit is connected by two outputs of the 2nd H bridge power model in it energy-storage units adjacent with homophase or analogue unit; Described battery simulating device comprises reactor, PWM rectifier, DC capacitor and terminal, wherein:
One end of described reactor connects one group of secondary winding of described Multiple coil phase shifting transformer, and the other end connects the input of described PWM rectifier;
Described PWM rectifier, DC capacitor and terminal all with described 2nd H bridge power module parallel.
2. chain type variable dc dummy source according to claim 1 and high-voltage energy storage converter all-in-one, it is characterized in that, a described H bridge power model is identical with the 2nd H bridge power module architectures, comprise the switching device of four band anti-paralleled diodes, the branch road that every two switching devices series connection is formed is parallel with one another; The series connection end of two switching devices be in series is as an output.
3. chain type variable dc dummy source according to claim 2 and high-voltage energy storage converter all-in-one, is characterized in that, described each energy-storage units also comprises resistance, switch and electric capacity, wherein:
One end of described energy-storage battery connects an input of a described H bridge power model by described resistance, the other end of energy-storage battery connects another input of a described H bridge power model;
Described switch and described resistor coupled in parallel;
Described electric capacity and a described H bridge power module parallel.
4. the chain type variable dc dummy source according to claim 1 or 3 and high-voltage energy storage converter all-in-one, is characterized in that, described energy-storage battery is lithium battery, flow battery, sodium-sulphur battery, lead-acid battery or ultracapacitor.
5. the control system based on the chain type variable dc dummy source described in any one of claims 1 to 3 and high-voltage energy storage converter all-in-one, it is characterized in that, comprise sample processing unit, central data processor, pwm signal generative circuit, optical-fibre communications drive circuit, man-machine interface and with each power cell 3N cell controller one to one, wherein:
Described sample processing unit sampling line voltage and input current information, and after carrying out the digitized process of discretization, export to described central data processor;
Described central data processor, to the data message analytical calculation received, controls described pwm signal generative circuit and generates pwm pulse control signal needed for each power cell, and pass to described optical-fibre communications drive circuit;
Described optical-fibre communications drive circuit is sent to described unit controller by after each pwm pulse control signal coded treatment received through optical fiber;
Each cell controller, the pwm pulse control signal according to receiving controls corresponding power unit, meanwhile, the work state information of corresponding power cell is fed back to described central data processor;
Described man-machine interface connects described central data processor, for man-machine interaction.
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| CA2808884A1 (en) * | 2010-08-24 | 2012-03-01 | Alstom Technology Ltd | Hvdc converter with neutral-point connected zero-sequence dump resistor |
| CN103280829B (en) * | 2013-04-26 | 2016-06-01 | 上海交通大学 | A kind of isolation double-stage chain type current transformer being applied to high capacity cell energy storage |
| CN203387195U (en) * | 2013-07-31 | 2014-01-08 | 上海电气集团股份有限公司 | Chain type variable DC simulation source and high-voltage energy storage converter integrated machine |
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