CN105138799B - Suitable for the direct current reactor Parameters design of modularization multi-level converter - Google Patents
Suitable for the direct current reactor Parameters design of modularization multi-level converter Download PDFInfo
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- CN105138799B CN105138799B CN201510600686.2A CN201510600686A CN105138799B CN 105138799 B CN105138799 B CN 105138799B CN 201510600686 A CN201510600686 A CN 201510600686A CN 105138799 B CN105138799 B CN 105138799B
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Abstract
The invention discloses a kind of direct current reactor Parameters design suitable for modularization multi-level converter, including：The maximum instantaneous current value I of bridge arm permission is determined according to converter valve parameterlim；When calculating generation direct-current polar short trouble, the bridge arm current maximum value I before system lockingfault；The maximum instantaneous current value I that bridge arm is allowedlimBridge arm current maximum value I before being latched with systemfaultIt is compared, calculates the lower limiting value L of direct current reactor inductancelim, and as the final design value of direct current reactor inductance.Advantageous effect of the present invention：The maximum fault current limit value condition that can bear by bridge arm designs direct current reactor inductance value, while considers exchange feed-in, the influence that capacitance discharges to fault current, and computational methods are simple, and result of calculation is more accurate.
Description
Technical field
The present invention relates to Power System Flexible transmission ＆ distribution electro-technical fields, and in particular to one kind is changed suitable for modular multilevel
Flow the direct current reactor Parameters design of device.
Background technology
With application of the development and Power Electronic Technique of all-controlling power electronics device in electric system, based on module
The flexible DC transmission technology for changing multilevel converter is paid more and more attention.Direct current reactor is modular multilevel current conversion station system
One of important equipment in system, parameter directly affect the fault current rejection ability of system.The design of direct current reactor parameter
The main factor for considering two aspects：
First, bridge arm submodule limits the ability to bear of fault current final value.Most harsh operating mode is that direct current occurs for system
Bipolar short trouble, at this time bridge arm current rapidly rise, consider direct-current polar short trouble when, if system locking before bridge arm
Fault current is not up to the electric current final value that submodule can be born, then does not need to direct current reactor and carry out raising speed on fault current limiting
Rate；If bridge arm fault current has reached the electric current final value that submodule can be born before system locking, need to design at this time
Direct current reactor inhibits fault current climbing, with the safety of safeguards system.
Second is that direct current reactor and bridge arm reactor are distributed rationally.Direct current reactor is bigger, and system time constant is bigger,
Transient response time is longer, while increases construction cost, therefore, is meeting the design condition of bridge arm reactor and to failure
In the case of the limit value condition of electric current, the inductance value of direct current reactor should be reduced as far as possible.
Direct current reactance is determined by fault current climbing rejection condition, direct current dynamic responding speed condition in the prior art
The upper lower limit value of device inductance value, but this method has ignored influence of the exchange feed-in trouble point to fault current, and result of calculation is deposited
In large error.
Invention content
The purpose of the present invention is exactly to solve the above problems, and provides a kind of direct current suitable for modularization multi-level converter
Reactor Parameters design, maximum fault current limit value condition that this method can bear by bridge arm design direct current reactance
The parameter of device, while consider exchange feed-in, the influence that capacitance discharges to fault current, and direct current reactance has finally been calculated
Device value.
To achieve the above object, the present invention uses following technical proposals, including：
A kind of direct current reactor Parameters design suitable for modularization multi-level converter, including：
(1) the maximum instantaneous current value I of bridge arm permission is determined according to converter valve parameterlim；
(2) when calculating generation direct-current polar short trouble, the bridge arm current maximum value I before current conversion station lockingfault；
(3) the maximum instantaneous current value I for allowing bridge armlimBridge arm current maximum value I before being latched with systemfaultIt carries out
Compare, if Ilim>Ifault, then it is not provided with direct current reactor；If Ilim<Ifault, then the lower limit of direct current reactor inductance is calculated
Value Llim, and as the final design value of direct current reactor inductance.
The maximum instantaneous current value I that step (1) bridge arm allowslimIt is limited according to the electric current of component each in converter valve
Parameter processed is set.
In the step (2), bridge arm current maximum value I before system lockingfaultComputational methods be：
After direct-current polar short trouble occurs, bridge arm fault current is made of two parts：A part is put for submodule capacitance
Electric current, the electric current that a part is generated for AC system feed-in；
Branch equivalent inductance L during direct-current polar short troubleeqEqual to bridge arm reactor inductance value Larm；
The current-rising-rate that computational submodule capacitance discharge current climbing and AC system feed-in generate respectively, according to upper
State current-rising-rate and bridge arm overcurrent protection time setting value Tpro, obtain bridge arm current maximum value I before system lockingfault。
The determining method of the submodule capacitance discharge current climbing is：
Wherein, LeqFor circuit equivalent inductance；ReqFor circuit equivalent resistance；CsmFor submodule capacitance；N is bridge arm submodule
Number；TcFor capacitance discharge cycle；UdcFor DC bus-bar voltage.
The determining method for the current-rising-rate that the AC system feed-in generates is：
Wherein, UsFor converter valve side ac phase voltage peak value；LσFor Transformer Short Circuit Impedance.
Bridge arm current maximum value I before system lockingfaultSpecially：
Wherein, IproFor bridge arm overcurrent protection setting valve；UsFor converter valve side ac phase voltage peak value；UdcFor dc bus
Voltage；LarmFor bridge arm reactor inductance value；LσFor Transformer Short Circuit Impedance value；TproFor bridge arm overcurrent protection time setting value.
The lower limiting value L of direct current reactor inductance is calculated in the step (3)limMethod be specially：
Wherein, IproFor bridge arm overcurrent protection setting valve, UsFor converter valve side ac phase voltage peak value；UdcFor dc bus
Voltage；LarmFor bridge arm reactor inductance value；LσFor Transformer Short Circuit Impedance；TproFor bridge arm overcurrent protection time setting value.
The lower limiting value L of direct current reactor inductance valuelimSpecially：
Llim=max (Ldc1,Ldc2)；
LarmFor bridge arm reactor value；LσFor Transformer Short Circuit Impedance, IproFor bridge arm overcurrent protection setting valve, IfaultTo be
Bridge arm current maximum value before system locking, UsFor converter valve side ac phase voltage peak value；UdcFor DC bus-bar voltage, TproFor bridge arm
Overcurrent protection time setting value.
Advantageous effect of the present invention：
Direct current reactor Parameters design of the present invention by maximum fault current limit value condition that bridge arm can bear come
Design direct current reactor inductance value, it is contemplated that the influence that exchange feed-in, capacitance discharge to fault current, computational methods are simple, together
When result of calculation expression formula in without capacitance parameter, eliminate the influence that capacitance parameter error calculates direct current reactor parameter,
As a result it is more accurate.
Description of the drawings
Fig. 1 is direct current reactor parameter designing process flow diagram flow chart provided by the invention；
Fig. 2 is capacitance electric discharge equivalent circuit provided by the invention；
Fig. 3 is exchange feed-in fault current equivalent circuit provided by the invention.
Specific embodiment
The present invention will be further described with embodiment below in conjunction with the accompanying drawings：
Direct current reactor design method design cycle block diagram of the present invention is as shown in Figure 1.
It first has to obtain the maximum instantaneous current value I of bridge arm permission according to converter valve parameterlim.In the design of converter valve
Cheng Zhong needs to carry out type selecting to major loop device, and the maximum instantaneous current value that bridge arm allows to flow through is by members such as switching device, capacitances
The limit value of part can obtain the maximum instantaneous that bridge arm allows to flow through by the databook or consulting producer of consulting related elements
Current value Ilim。
Secondly when calculating generation direct-current polar short trouble, the bridge arm current maximum value I before system lockingfault。
System transient modelling regulating time can be caused elongated after direct current reactor, and increase being built into for current conversion station due to adding in
This, it is therefore desirable to the necessity for adding in direct current reactor is verified.During present invention selection direct-current polar short trouble, system
Bridge arm maximum current value I before lockingfaultWith IlimIt compares, to determine the need for design direct current reactor.
After direct-current polar short trouble occurs, bridge arm fault current is made of two parts, and a part is put for submodule capacitance
Electric current, the electric current that a part is generated for AC system feed-in.It is considered that the two is linear change in short time, then it changes
Rate may be calculated：
1. submodule capacitance discharge current change rate calculates.
Submodule discharge loop equivalent circuit is as shown in Figure 2.Wherein LeqFor circuit equivalent inductance, ReqFor the equivalent electricity in circuit
Resistance, CsmFor submodule capacitance, N is bridge arm submodule number.
Wherein ReqIt is relatively small, it can be ignored, therefore capacitance discharge cycle may be calculated：
Then submodule discharge current climbing may be calculated：
2. it exchanges feed-in current-rising-rate to calculate.
It is as shown in Figure 3 to exchange feed-in current equivalence circuit.Wherein Req、RstrayFor circuit equivalent resistance, LσIt is short for transformer
Roadlock resists, usFor power grid phase voltage, LeqFor branch equivalent inductance.
Due to Req、RstrayIt is relatively small, it can be ignored, then bridge arm current may be calculated：
Consider the operating mode of most serious, then bridge arm current climbing maximum value may be calculated：
Bridge arm maximum current before system protection action may be calculated (L during direct-current polar short troubleeqEqual to Larm)：
In formula, IproFor bridge arm overcurrent protection current setting；TproFor bridge arm overcurrent protection time setting value, UdcFor direct current
Busbar voltage.
Finally compare IlimAnd IfaultMagnitude relationship, and determine direct current reactor final design value.
The determining method of direct current reactor final design value is：
Work as IlimMore than IfaultWhen, it can theoretically be not provided with direct current reactor.
Work as IlimLess than IfaultWhen, need that direct current reactor is set to inhibit fault current, at this time need by solve equation come
Calculate direct current reactor lower limiting value Llim, following (the equivalent electricity in DC bipolar short trouble circuit after access direct current reactor of equation
Feel LeqFor LarmWith direct current reactor and)：
(8) are solved equation, the lower limiting value of direct current reactor value can be obtained：
Llim=max (Ldc1,Ldc2) (9)
In formula：
Consider distributing rationally for direct current reactor, then select the direct current reactor lower limiting value L being calculatedlimAs direct current
The final design value of reactor, i.e. Ldc=Llim。
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (7)
1. a kind of direct current reactor Parameters design suitable for modularization multi-level converter, it is characterized in that, including：
(1) the maximum instantaneous current value I of bridge arm permission is determined according to converter valve parameterlim；
(2) when calculating generation direct-current polar short trouble, bridge arm current maximum value I before system lockingfault；
Bridge arm current maximum value I before system lockingfaultComputational methods be：
After direct-current polar short trouble occurs, bridge arm fault current is made of two parts：A part is submodule capacitance electric discharge electricity
Stream, the electric current that a part is generated for AC system feed-in；
Branch equivalent inductance L during direct-current polar short troubleeqEqual to bridge arm reactor inductance value Larm；
The current-rising-rate that computational submodule capacitance discharge current climbing and AC system feed-in generate respectively, according to submodule
Capacitance discharge current climbing, the current-rising-rate of AC system feed-in generation, bridge arm overcurrent protection time setting value Tpro, obtain
Bridge arm current maximum value I before being latched to systemfault；
(3) the maximum instantaneous current value I for allowing bridge armlimBridge arm current maximum value I before being latched with systemfaultIt is compared, such as
Fruit Ilim>Ifault, then it is not provided with direct current reactor；If Ilim<Ifault, then the lower limiting value L of direct current reactor inductance is calculatedlim,
And as the final design value of direct current reactor inductance.
2. a kind of direct current reactor Parameters design suitable for modularization multi-level converter as described in claim 1,
It is characterized in that the maximum instantaneous current value I that step (1) bridge arm allowslimIt is limited according to the electric current of component each in converter valve
Parameter processed is set.
3. a kind of direct current reactor Parameters design suitable for modularization multi-level converter as described in claim 1,
It is characterized in that the determining method of the submodule capacitance discharge current climbing is：
Wherein, LeqBranch equivalent inductance during for direct-current polar short trouble；CsmFor submodule capacitance；N is bridge arm submodule number；Tc
For capacitance discharge cycle；UdcFor DC bus-bar voltage.
4. a kind of direct current reactor Parameters design suitable for modularization multi-level converter as described in claim 1,
It is characterized in that the determining method for the current-rising-rate that the AC system feed-in generates is：
Wherein, UsFor converter valve side ac phase voltage peak value；LσFor Transformer Short Circuit Impedance.
5. a kind of direct current reactor Parameters design suitable for modularization multi-level converter as described in claim 1,
It is characterized in that bridge arm current maximum value I before system lockingfaultSpecially：
Wherein, IproFor bridge arm overcurrent protection setting valve；UsFor converter valve side ac phase voltage peak value；UdcFor DC bus-bar voltage；
LarmFor bridge arm reactor inductance value；LσFor Transformer Short Circuit Impedance；TproFor bridge arm overcurrent protection time setting value.
6. a kind of direct current reactor Parameters design suitable for modularization multi-level converter as described in claim 1,
It is characterized in that the lower limiting value L of direct current reactor inductance is calculated in the step (3)limMethod be specially：
Wherein, IproFor bridge arm overcurrent protection setting valve, UsFor converter valve side ac phase voltage peak value；UdcFor DC bus-bar voltage；
LarmFor bridge arm reactor inductance value；LσFor Transformer Short Circuit Impedance；TproFor bridge arm overcurrent protection time setting value.
7. a kind of direct current reactor Parameters design suitable for modularization multi-level converter as claimed in claim 6,
It is characterized in that the lower limiting value L of direct current reactor inductancelimSpecially：
Llim=max (Ldc1,Ldc2)；
Wherein,
LarmFor bridge arm reactor inductance value；LσFor Transformer Short Circuit Impedance, IproFor bridge arm overcurrent protection setting valve, IfaultTo be
Bridge arm current maximum value before system locking, UsFor converter valve side ac phase voltage peak value；UdcFor DC bus-bar voltage, TproFor bridge arm
Overcurrent protection time setting value.
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| CN105701339B (en) * | 2016-01-06 | 2018-09-04 | 北京清电华力电气自动化科技有限公司 | A kind of computational methods of magnitude lower limit for DC traction high current inhibition inductance |
| CN106407494B (en) * | 2016-03-25 | 2020-01-14 | 华北电力大学 | MMC-based bipolar short-circuit fault current calculation method for HVDC system |
| CN106484998A (en) * | 2016-10-11 | 2017-03-08 | 南方电网科学研究院有限责任公司 | Modularization multi-level converter parameter integral Calculation Method based on Non-Linear Programming |
| CN106786709A (en) * | 2016-11-21 | 2017-05-31 | 中国能源建设集团浙江省电力设计院有限公司 | A kind of flexible direct current converter station main electrical scheme Optimal Configuration Method |
| CN106970269B (en) * | 2017-03-31 | 2019-04-26 | 华北电力大学 | Modularized multi-level converter sub-module local stray inductance extraction method and system |
| CN106887830B (en) * | 2017-04-05 | 2019-05-10 | 南方电网科学研究院有限责任公司 | A kind of converter valve transient current climbing control method and device |
| CN107817415A (en) * | 2017-11-10 | 2018-03-20 | 全球能源互联网研究院有限公司 | A kind of bipolar short trouble variable characteristics analysis method of converter and system |
| CN108429252B (en) * | 2018-02-08 | 2020-12-04 | 中国科学院电工研究所 | Method for calculating contribution short-circuit current of alternating current system during direct current fault of multi-terminal alternating current-direct current hybrid power distribution network |
| CN112018739B (en) * | 2020-08-28 | 2022-10-25 | 广东电网有限责任公司广州供电局 | Current-limiting inductance selection method based on voltage source converter and related device |
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