CN204333943U - A kind of multi-objective short-circuit Fault Current Limiting Device - Google Patents

A kind of multi-objective short-circuit Fault Current Limiting Device Download PDF

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Publication number
CN204333943U
CN204333943U CN201420867058.1U CN201420867058U CN204333943U CN 204333943 U CN204333943 U CN 204333943U CN 201420867058 U CN201420867058 U CN 201420867058U CN 204333943 U CN204333943 U CN 204333943U
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China
Prior art keywords
phase
circuit
passive filter
short
bridge
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CN201420867058.1U
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Inventor
黄明辉
陈志光
曾耿晖
李一泉
朱峥
邱建
屠卿瑞
王峰
李盛兴
李帅虎
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Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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Hangzhou Zhi Guangyichuan Science And Technology Ltd
Electric Power Dispatch Control Center of Guangdong Power Grid Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Abstract

The utility model discloses a kind of multi-objective short-circuit Fault Current Limiting Device, comprise system power supply, parallel network circuit, inverter circuit and master control system; Each single phase circuit of parallel network circuit is serially connected with short circuit current limitation reactor and rapid closing switch, and is connected in series with system power supply by short circuit current limitation reactor; Each rapid closing switch is parallel with metal oxide pressure-limiting device and serial compensation capacitance; Inverter circuit comprises A phase passive filter, B phase passive filter and C phase passive filter, is connected with each phase short circuit current limitation reactor respectively by rapid closing switch; The input of each single phase passive filter connects the AC of intermediate frequency transformer group, and the DC side of intermediate frequency transformer group is connected with IGBT type inversion full-bridge; Each phase IGBT type inversion full-bridge is connected with inversion full-bridge direct current lateral capacitance jointly.The utility model can take into account the multiple target combination properties such as reliability, rapidity, cost be low when short trouble occurs.

Description

A kind of multi-objective short-circuit Fault Current Limiting Device
Technical field
The utility model relates to electric and electronic technical field, particularly relates to a kind of multi-objective short-circuit Fault Current Limiting Device.
Background technology
Along with the continuous expansion of electric power system transmission capacity, grid short circuit levels of current also constantly increases, short trouble has very large potential threat to electric power system and power equipment, and limiting short-circuit current has become a unavoidable important technical and economic problems in modern power network development.In addition, the safety and reliability of people to the quality of power supply, power supply it is also proposed higher requirement.But short circuit current mainly relies on fully cut-offfing of circuit breaker in the world at present, the growth of electric power system capacity is caused to receive the restriction of circuit breaker level.
Paying the utmost attention to for current limliting the effective measures taked is that adjustment electric power system grid structure is suitably to reduce the electrical link between electrical network.The major way of current grid structure adjustment comprises and cut-offs circuit, partition running, bus splitting, series reactor, employing high impedance device etc.Facts have proved, receiving end power network line cut-offs relatively simple, and the restriction effect of short circuit current is also very remarkable, its common way is all the outlet of directly cut-offfing the website that exceeds standard, the branch road injecting short circuit current by reducing Nodes reduces the total current of this place's node, but in fact this way is only the effect of optimization reaching local current, but does not consider the of overall importance of system., there is certain necessity to the integrality of maintenance system and fail safe in especially large-scale complex power grid.
Existing short-circuit fault current limiter mostly is solid-state current limiter, superconduction saturated core fault current limiter etc.Solid-state current limiter many employings power electronic device controls, and the through-current capability of power electronic device is limited, needs the mode adopting multiple device parallel connection, and in the synchronism of action, also have requirement, cause flow restricter cost to raise, reliability is affected simultaneously.Superconduction saturated core fault current limiter needs extra direct current system to be direct supercurrent coil power supply, and during to make normally to work, iron core is in degree of depth saturation condition, causes flow restricter manufacturing cost to increase, and volume increases, and reliability reduces.
For taking into account the advantage of the combination properties such as reliability, rapidity, cost are low, a large amount of short circuit current limiter circuit is still in experiment and tentative stage, because the factor such as performance, cost does not also have a kind of short circuit current limiter to reach effective multiobjective decision-making scheme at present.Along with the fast development of industry, need badly and a kind of multi-objective short-circuit Fault Current Limiting Device is provided, can need to control its equiva lent impedance according to system, therefore when short trouble occurs, the effects such as adjusting circuit trend, suppression system oscillation, the raising stability of a system, also can reduce fault current levels, be applicable to high pressure long distance power transmission.
Utility model content
Based on this, the utility model provides a kind of multi-objective short-circuit Fault Current Limiting Device, can take into account the multiple target combination properties such as reliability, rapidity, cost be low when short trouble occurs.
A kind of multi-objective short-circuit Fault Current Limiting Device, comprises system power supply, parallel network circuit, inverter circuit and master control system;
Each single phase circuit of described parallel network circuit is serially connected with short circuit current limitation reactor and rapid closing switch, and is connected in series with described system power supply by described short circuit current limitation reactor; Each described rapid closing switch is parallel with metal oxide pressure-limiting device and serial compensation capacitance;
Described inverter circuit comprises: A phase passive filter, B phase passive filter and C phase passive filter; The output of described A phase passive filter is connected with A phase short circuit current limitation reactor by the first rapid closing switch; The output of described B phase passive filter is connected with B phase short circuit current limitation reactor by the second rapid closing switch K2; The output of described C phase passive filter is connected with C phase short circuit current limitation reactor by the 3rd rapid closing switch;
Described A phase passive filter, B phase passive filter and the input of C phase passive filter are connected the AC of an intermediate frequency transformer group respectively, and the DC side of each described intermediate frequency transformer group connects a single-phase IGBT type inversion full-bridge; Each phase IGBT type inversion full-bridge is connected with inversion full-bridge direct current lateral capacitance jointly; Described each phase IGBT type inversion full-bridge is also connected with described master control system.
Preferably, each described single-phase IGBT type inversion full-bridge comprises switch commutation components and the IGBT passive absorption circuit in parallel with described switch commutation components;
The passive absorption circuit of described IGBT is made up of noninductive resistance and sudden-wave absorbing electric capacity.
Preferably, the described master control system data acquisition circuit, zero cross detection circuit and the IGBT drive circuit that comprise master controller and be connected respectively with described master controller;
Described data acquisition circuit is also connected with described parallel network circuit with described zero cross detection circuit; Described IGBT drive circuit is connected with described each phase IGBT type inversion full-bridge input.
Preferably, described A phase passive filter, B phase passive filter and C phase passive filter comprise the monotonic filter of multiple parallel connection respectively.
Preferably, described A phase passive filter, B phase passive filter and C phase passive filter also comprise the high pass filter be connected with the AC of corresponding intermediate frequency transformer group respectively.
Above-mentioned multi-objective short-circuit Fault Current Limiting Device, the feature of device for harmonic suppression and reactive power compensation, fast and reliable limiting short-circuit current when not only there is failure operation, the effect of the voltage-drop that series connection current limiting reactor causes is reduced during normal operation, harmonics restraint and the no-power compensation function of nonlinear load can also be realized, improve power supply reliability and the stability of a system.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the multi-objective short-circuit Fault Current Limiting Device that the utility model provides.
Fig. 2 is that a kind of of the single-phase inversion full-bridge that provides of the utility model Fig. 1 embodiment can the topological structure schematic diagram of implementation.
Fig. 3 is a kind of structural representation of the passive filter that the utility model Fig. 1 embodiment provides.
Fig. 4 is the structural representation of another embodiment of multi-objective short-circuit Fault Current Limiting Device that the utility model figure provides.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
See Fig. 1, it is the structural representation of an embodiment of the multi-objective short-circuit Fault Current Limiting Device that the utility model provides.
The multi-objective short-circuit Fault Current Limiting Device that the present embodiment provides, comprises system power supply 10, parallel network circuit 20, inverter circuit 30 and master control system 40;
Each single phase circuit of described parallel network circuit 20 is serially connected with short circuit current limitation reactor and rapid closing switch, and is connected in series with described system power supply 10 by described short circuit current limitation reactor; Each described rapid closing switch is parallel with metal oxide (Metal-Oxide-Varistor is called for short MOV) voltage limiter and serial compensation capacitance.Particularly, as shown in Figure 1, A circuitry phase is serially connected with short circuit current limitation reactor L1 and the first rapid closing switch K1, and rapid closing switch K1 two ends are parallel with MOV voltage limiter M1 and serial compensation capacitance C1; B circuitry phase is serially connected with short circuit current limitation reactor L2 and the second rapid closing switch K2, and rapid closing switch K2 two ends are parallel with MOV voltage limiter M2 and serial compensation capacitance C2; C circuitry phase is serially connected with short circuit current limitation reactor L3 and the 3rd rapid closing switch K3, and rapid closing switch K3 two ends are parallel with MOV voltage limiter M3 and serial compensation capacitance C3.During concrete enforcement, rapid closing switch described in each can adopt bi-stable permanent magnetism operating mechanism, makes its closing operation full stroke time controling within 10ms, as the overvoltage protection of the serial compensation capacitance of related circuit; The serial compensation capacitance of each phase can adopt string to mend electricity container group and realize.The MOV voltage limiter of each phase and the series resonance-type fault current limiter of rapid closing switch, when system is short-circuited fault, the MOV voltage limiter quick acting being connected in parallel on electric capacity two ends makes serial compensation capacitance short circuit, break series resonance condition, short circuit current limitation reactor is sealed in system and realizes current limliting, effectively suppress the first peak value of short circuit current.MOV voltage limiter as the overvoltage protection of serial compensation capacitance, makes serial compensation capacitance voltage be limited in the residual voltage level of MOV voltage limiter simultaneously.Rapid closing switch is as the backup protection of MOV voltage limiter hot tolerance in short-term.When being short-circuited fault, rapid closing switch can discharge the capacity of short circuit that MOV voltage limiter absorbs, and greatly alleviates the burden of MOV voltage limiter, extends MOV voltage limiter useful life, improves economy, the reliability of fault current limiter.
Described inverter circuit 30 comprises: A phase passive filter 301, B phase passive filter 302 and C phase passive filter 303; The output of described A phase passive filter 301 is connected with A phase short circuit current limitation reactor L1 by rapid closing switch K1; The output of described B phase passive filter 302 is connected with B phase short circuit current limitation reactor L2 by rapid closing switch K2; The output of described C phase passive filter 303 is connected with C phase short circuit current limitation reactor L3 by rapid closing switch K3.
The input of each single phase passive filter connects the AC of intermediate frequency transformer group, the DC side of described intermediate frequency transformer group is connected with IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) type inversion full-bridge; Each phase IGBT type inversion full-bridge is connected with inversion full-bridge direct current lateral capacitance C4 jointly; Described each phase IGBT type inversion full-bridge is also connected with described master control system 40.Particularly, A phase passive filter 301 is connected with intermediate frequency transformer group 304 AC, and intermediate frequency transformer group 304 DC side is connected with IGBT type inversion full-bridge 305; B phase passive filter 302 is connected with intermediate frequency transformer group 306 AC, and intermediate frequency transformer group 306 DC side is connected with IGBT type inversion full-bridge 307; C phase passive filter 303 is connected with intermediate frequency transformer group 308 AC, and intermediate frequency transformer group 308 DC side is connected with IGBT type inversion full-bridge 309.Wherein, electric capacity C4 can be used as the direct voltage support electrochemical capacitor of inversion full-bridge; The intermediate frequency transformer group that the three-phase output end of each inversion full-bridge composition is single-phase with three is respectively connected, to reach the object be incorporated into the power networks.Each phase intermediate frequency transformer group achieves electric network source and the buffer action of each phase IGBT type inversion full-bridge on electrically on the one hand, achieves corresponding single-phase inversion full-bridge direct current voltage modulated output AC voltage at single-phase mid-frequency Circuit Fault on Secondary Transformer no-load voltage ratio output action on the other hand.
See Fig. 2, be that a kind of of the single-phase inversion full-bridge that provides of the utility model Fig. 1 embodiment can the topological structure schematic diagram of implementation.
In the attainable mode of one, each single-phase IGBT type inversion full-bridge comprises switch commutation components and the IGBT passive absorption circuit in parallel with described switch commutation components; The passive absorption circuit of described IGBT is made up of noninductive resistance and sudden-wave absorbing electric capacity.
Particularly, as shown in Figure 2, for the intermediate frequency transformer group 304 of A phase and IGBT type inversion full-bridge 305, IGBT type inversion full-bridge 305 comprises four brachium pontis be made up of four switch commutation components S1 ~ S4, the structure of each switch commutation components is identical, be formed by connecting by IGBT and anti-paralleled diode thereof, conduction voltage drop≤2V; Resistance R1 ~ R4 is respectively the noninductive resistance of each brachium pontis, and electric capacity C1 ~ C4 can absorb the surging that contravariant equipment produces.T1 is the medium-frequency isolation transformer that primary side is connected with single-phase inversion full-bridge output, and primary side and the secondary side no-load voltage ratio of this intermediate frequency transformer are 1:k.
According to Fig. 2, the concrete operations mode that the output voltage of the arbitrary single-phase inversion full-bridge of current-limiting apparatus inverter circuit part that the present embodiment provides is formed can be described.As shown in Figure 2, the output voltage of single-phase inversion full-bridge is:
u o(δ，wt，θ，α)＝kS(δ，wt，θ，α)u dc(1)
Wherein:
S ( δ , wt , θ , α ) = Σ n = 1 ∞ 4 nπ sin nθ 2 sin nπ 2 sin ( nwt - δ - n 1 · 2 π 3 - n 2 · α ) - - - ( 2 )
In above formula, n=1,3,5 ...
During concrete enforcement, when system is normally run, inverter circuit 30 and circuit load parallel running, implement reactive power compensation and the harmonics restraint of load side, inverter circuit 30 injects corresponding reactive power in load side simultaneously, compensates the voltage-drop that series connection short circuit current restriction reactor on the line produces; When load side is short-circuited, inverter circuit 30 enters trigger impulse blocking, out of service.Because short circuit current restriction reactor loses compensation, therefore play rapidly the effect of current limliting.
Further, described A phase passive filter 301, B phase passive filter 302 and C phase passive filter 303 comprise the monotonic filter of multiple parallel connection respectively, by the major harmonic of each phase passive filter filtering appts.
See Fig. 3, it is a kind of structural representation of the passive filter that the utility model Fig. 1 embodiment provides.
Wherein, the structure of the passive filter of each phase is identical, and for A phase passive filter 301, it can comprise the monotonic filter of multiple parallel connection, and each monotonic filter is composed in series by capacitor and reactor.Particularly, as shown in Figure 3, A phase passive filter 301 comprises the first monotonic filter be composed in series by electric capacity C5 and reactor L4, the second monotonic filter be composed in series by electric capacity C6 and reactor L5; Further, each phase single phase passive filter also comprises the high pass filter connected with the AC of corresponding intermediate frequency transformer group respectively.Such as, the A phase passive filter 301 shown in Fig. 3 can further include the A phase high pass filter be made up of electric capacity C7 and reactor L6, and one end of this high pass filter is connected with intermediate frequency transformer group 304.In the present embodiment, each switch commutation components S1 ~ S4 also can combine as Active Power Filter-APF, due to the high order harmonic component produced when high pass filter filtering single-phase inversion full-bridge works, now Active Power Filter-APF only bears less harmonic voltage and harmonic current, therefore its capacity reduces greatly.Wherein, transformer T1 is a part in intermediate frequency transformer group.
See Fig. 4, it is the structural representation of another embodiment of multi-objective short-circuit Fault Current Limiting Device that the utility model figure provides.
The distinctive points of the present embodiment and Fig. 1 embodiment is, further, data acquisition circuit 402, zero cross detection circuit 403 and IGBT drive circuit 404 that the described master control system 40 in the present embodiment comprises master controller 401 and is connected respectively with described master controller 401.
Wherein, described data acquisition circuit 402 is also connected with described parallel network circuit 10 with described zero cross detection circuit 403; Described IGBT drive circuit 404 is connected with described each phase IGBT type inversion full-bridge input, switches for the state of drived control inverter circuit 30 when being short-circuited fault.In addition, the structure composition of system power supply 10 parallel network circuit 20, inverter circuit 30 and operation principle, with related content is all identical above, do not repeat them here.
The master control system 40 of the present embodiment according to the needs of practical application, can gather more parameter or data in electrical network, obtains short circuit current fault to the impact of the various parameter of electrical network, realize the greater functionality beyond to grid current limiting to analyze.When fault occurs or after trouble shooting, avoid the normal operating conditions of other circuit affecting electrical network.
The multi-objective short-circuit Fault Current Limiting Device that the utility model provides, the feature of device for harmonic suppression and reactive power compensation, fast and reliable limiting short-circuit current when not only there is failure operation, the effect of the voltage-drop that series connection current limiting reactor causes is reduced during normal operation, harmonics restraint and the no-power compensation function of nonlinear load can also be realized, improve power supply reliability and the stability of a system.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.

Claims (5)

1. a multi-objective short-circuit Fault Current Limiting Device, is characterized in that, comprises system power supply, parallel network circuit, inverter circuit and master control system;
Each single phase circuit of described parallel network circuit is serially connected with short circuit current limitation reactor and rapid closing switch, and is connected in series with described system power supply by described short circuit current limitation reactor; Each described rapid closing switch is parallel with metal oxide pressure-limiting device and serial compensation capacitance;
Described inverter circuit comprises: A phase passive filter, B phase passive filter and C phase passive filter; The output of described A phase passive filter is connected with A phase short circuit current limitation reactor by the first rapid closing switch; The output of described B phase passive filter is connected with B phase short circuit current limitation reactor by the second rapid closing switch K2; The output of described C phase passive filter is connected with C phase short circuit current limitation reactor by the 3rd rapid closing switch;
Described A phase passive filter, B phase passive filter and the input of C phase passive filter are connected the AC of an intermediate frequency transformer group respectively, and the DC side of each described intermediate frequency transformer group connects a single-phase IGBT type inversion full-bridge; Each phase IGBT type inversion full-bridge is connected with inversion full-bridge direct current lateral capacitance jointly; Described each phase IGBT type inversion full-bridge is also connected with described master control system.
2. multi-objective short-circuit Fault Current Limiting Device according to claim 1, is characterized in that, each described single-phase IGBT type inversion full-bridge comprises switch commutation components and the IGBT passive absorption circuit in parallel with described switch commutation components;
The passive absorption circuit of described IGBT is made up of noninductive resistance and sudden-wave absorbing electric capacity.
3. multi-objective short-circuit Fault Current Limiting Device according to claim 2, is characterized in that, data acquisition circuit, zero cross detection circuit and IGBT drive circuit that described master control system comprises master controller and is connected respectively with described master controller;
Described data acquisition circuit is also connected with described parallel network circuit with described zero cross detection circuit; Described IGBT drive circuit is connected with described each phase IGBT type inversion full-bridge input.
4. multi-objective short-circuit Fault Current Limiting Device according to claim 3, is characterized in that, described A phase passive filter, B phase passive filter and C phase passive filter comprise the monotonic filter of multiple parallel connection respectively.
5. multi-objective short-circuit Fault Current Limiting Device according to claim 4, it is characterized in that, described A phase passive filter, B phase passive filter and C phase passive filter also comprise the high pass filter be connected with the AC of corresponding intermediate frequency transformer group respectively.
CN201420867058.1U 2014-12-30 2014-12-30 A kind of multi-objective short-circuit Fault Current Limiting Device Active CN204333943U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106711979A (en) * 2017-01-10 2017-05-24 中国电力科学研究院 DC power transmission system commutation failure suppression method and system
CN106936133A (en) * 2017-05-02 2017-07-07 国网江苏省电力公司睢宁供电公司 A kind of topological power quality controlling system and its control method
CN110611313A (en) * 2019-10-10 2019-12-24 广东华邦创科智能技术有限公司 Three-phase four-wire AC power frequency intelligent protection safety power supply
CN113872182A (en) * 2021-07-15 2021-12-31 华邦创科(惠州市)智能科技有限公司 Three-phase delta-Y type isolated safety power supply system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106711979A (en) * 2017-01-10 2017-05-24 中国电力科学研究院 DC power transmission system commutation failure suppression method and system
CN106711979B (en) * 2017-01-10 2020-04-17 中国电力科学研究院 Method and system for suppressing commutation failure of direct-current power transmission system
CN106936133A (en) * 2017-05-02 2017-07-07 国网江苏省电力公司睢宁供电公司 A kind of topological power quality controlling system and its control method
CN110611313A (en) * 2019-10-10 2019-12-24 广东华邦创科智能技术有限公司 Three-phase four-wire AC power frequency intelligent protection safety power supply
CN113872182A (en) * 2021-07-15 2021-12-31 华邦创科(惠州市)智能科技有限公司 Three-phase delta-Y type isolated safety power supply system
CN113872182B (en) * 2021-07-15 2024-03-22 华邦创科(惠州市)智能科技有限公司 Three-phase delta-Y type isolated safe power supply system

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Effective date of registration: 20230823

Address after: 510000 No. 75, Meihua Road, Yuexiu District, Guangzhou City, Guangdong Province (office building only)

Patentee after: ELECTRICAL POWER DISPATCHING & CONTROL CENTER OF GUANGDONG POWER GRID Co.,Ltd.

Address before: 510699 No. 75 Meihua Road, Yuexiu District, Guangzhou City, Guangdong Province

Patentee before: ELECTRICAL POWER DISPATCHING & CONTROL CENTER OF GUANGDONG POWER GRID Co.,Ltd.

Patentee before: HANGZHOU ZHIGUANG ECON TECHNOLOGY CO.,LTD.