CN100527561C - Short circuit fault current limiter - Google Patents
Short circuit fault current limiter Download PDFInfo
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- CN100527561C CN100527561C CNB2005100120358A CN200510012035A CN100527561C CN 100527561 C CN100527561 C CN 100527561C CN B2005100120358 A CNB2005100120358 A CN B2005100120358A CN 200510012035 A CN200510012035 A CN 200510012035A CN 100527561 C CN100527561 C CN 100527561C
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Abstract
A short trouble current limiter in particular relates to transmission and distribution network failure current limiter. It features on available bridge circuit type short trouble current limiter basic, rectifying bridge arm consisting of controllable solid-state switch tube series connected with current limiting resistance shunt circuit and then series connected with diode. The present invention realizes inductor and resistor combined current limiting, not only limiting failure current peak value but also steady state value.
Description
Technical field
The present invention relates to a kind of short-circuit fault current limiter, particularly the fault current limiter of transmission and distribution network.
Background technology
Along with fast development of national economy, society constantly increases the demand of electric power, driven the continuous development of electric power system, unit and station capacity, substation capacity, city and center of industry load constantly increase, just make between the electric power system interconnected, short circuit current level in the electrical networks at different levels improves constantly, and short trouble is also increasing to the destructiveness of electric power system and continuous electric equipment thereof.And in growing to the demand of electric energy, people also have higher requirement to the quality of power supply, power supply reliability and fail safe etc.Yet the transient stability problem of big electrical network is more outstanding, and wherein one of most important reason is because the conventional electric power technology lacks effective short-circuit current restriction technologies.At present, extensively adopt circuit breaker that short circuit current is fully cut-off in the world, because short circuit current level is directly related with the capacity of system, under the certain situation of the specified drop-out current level of circuit breaker, adopt and fully cut-off the growth that short circuit current will limit the capacity of electric power system, and circuit breaker costs an arm and a leg and its price rises rapidly with the increase of its specified drop-out current.Along with the expansion of net capacity and scale, it is even more serious that this problem will become.
Short-circuit fault current limiter provides new approaches for the solution of this problem.Such as; solid-state short-circuit fault current limiter it when detecting short trouble, by the impedance and the induction reactance parameter of quick change fault electrical network, fault current can be limited in lower level; with the protection power equipment, and guarantee under the prerequisite of existing circuit breaker breaking capacity, to cut off short trouble.Application number is that 200410003459.8 Chinese patent proposes a kind of short-circuit fault current limiter, and shown in Fig. 1 (a): its circuit mainly is made up of direct supercurrent reactor of the diode that constitutes rectifier bridge, the current limiting reactor of connecting with diode, fault current limiting etc.When normal operation, flow restricter does not have pressure drop, does not almost have a power consumption electrical network; The fault in case system is short-circuited, when power network current reaches the electric current of direct current reactor, the direct supercurrent reactor just is automatically connected into the common fault current limiting climbing of reactor on circuit and the bridge circuit, thereby fault current is limited in certain level, to guarantee the timely disengagement failure electric current of circuit breaker.In this flow restricter topology,, improved the current limiting capacity of flow restricter by giving the diode series reactor.Can cooperate the lower circuit breaker of level that opens circuit to realize the fault current rupturing operation of higher level by short-circuit fault current limiter.But this flow restricter is the reactor current limliting in itself, peak value that can only fault current limiting, steady-state value that can't fault current limiting.Application number is that a kind of short-circuit fault current limiter of proposing of 200510007537.1 Chinese patent is shown in Fig. 1 (b), this invention comprise existing fault current limiter by diode D1, D2, D3, rectifier bridge and current-limiting inductance that D4 forms, current-limiting inductance L (general inductance or superconduction inductance all can) is given in this invention a current-limiting resistance R series connection of series connection and a solid-state switch (GTO, IGBT, IGCT etc.) shunt circuit, give a current-limiting inductance L diode Ds (inverse parallel) in parallel and resistance R s series connection continuous current circuit, constituted a kind of short-circuit fault current limiter, wherein bridge circuit is constituted by a diode, and cancels grid bias power supply simultaneously.In the short-circuit fault current limiter of this invention, the solid-state switch in parallel with current-limiting resistance (GTO, IGBT, IGCT etc.) is composed in series by a plurality of solid-state switches, thereby satisfies the needs of flow restricter high-pressure work.This invention has proposed direct series connection such as GTO, IGBT and GTO, IGBT etc. satisfy high-tension needs with the construction of switch that IGCT directly connects, and has designed the continuous current circuit of superconducting current-limiting inductance, thereby has formed the short-circuit fault current limiter topology of multiple structure.This invention has realized resistance and the common current limliting of reactance in itself, both can the fault current limiting peak value, and again can the fault current limiting steady-state value.But, increasing with the short circuit malfunction capacity, the current-limiting resistance of this flow restricter is difficult to realize technically.
Summary of the invention
In order to overcome the deficiency of prior art, the present invention proposes a kind of short-circuit fault current limiter that is used for transmission and distribution network, it both can the fault current limiting peak value, again can the fault current limiting steady-state value.The present invention organically combines current-limiting resistance and solid-state switch pipe, makes that short-circuit fault current limiter of the present invention is simple in structure, manufacturing and operating cost is low, is more suitable for through engineering approaches.
The technical solution used in the present invention:
The present invention includes rectifier bridge and current-limiting inductance two parts that existing fault current limiter is made up of diode, controlled solid-state switch pipe and current-limiting resistance and form, current-limiting inductance of the present invention (generally inductance or superconduction inductance all can) still is connected dc terminal.On the brachium pontis of rectifier bridge, current-limiting resistance and controlled solid-state switch pipe (GTO, IGBT, SCR etc.) are in parallel, and a plurality of shunt circuits are in series, and connect with diode again, have formed switch control and the current limliting network on the brachium pontis.
In short-circuit fault current limiter of the present invention, switch control on the brachium pontis and current limliting network can be by changing the resistance of current-limiting resistance, change the number of current-limiting resistance and controlled solid-state switch pipe (GTO, IGBT, SCR etc.) shunt circuit, satisfy the needs of flow restricter high-pressure work.
The present invention can be single-phase short-circuit fault current limiter structure, it also can be the single-phase short-circuit fault current limiter structure that has coupling transformer, also can be that three single-phase short-circuit fault current limiters are applied to three-phase system and form the three phase short circuit fault occluder configurations, also can be that three single-phase short-circuit fault current limiters that have coupling transformer are applied to three-phase system and form the three-phase fault occluder configurations, also can be to adopt the fault current limiter structure of the three-phase system of optimizing and adopt the three-phase system fault current limiter structure of optimizing that has coupling transformer.
Major advantage of the present invention:
1, the present invention not only can the fault current limiting peak value, and can the fault current limiting steady-state value.The present invention adopts the mode of reactance and the common current limliting of resistance, has improved the current limiting capacity of flow restricter, thereby obtains than the better current limitation effect of existing short-circuit fault current limiter.
The series and parallel structure of controlled solid-state switch pipe, current-limiting resistance and the diode that 2, adopts among the present invention, not only help realizing the high voltage current limliting, and avoided the impact of high voltage to controlled solid-state switch pipe, prolong its useful life, improved the reliability of flow restricter.
3, the present invention designs current-limiting resistance on the brachium pontis of rectifier bridge and the directly parallel connection of controlled solid-state switch pipe, simplified the buffer loop of controlled solid-state switch pipe, avoid the impact of the big electric current of short trouble, helped the heat dissipation design of current-limiting resistance, be easy to realize big capacity.
4, the control method of flow restricter is simple among the present invention.Existing flow restricter needs periodically control, algorithm complexity.The in parallel controlled solid-state switch pipe of cut-off current-limiting resistance gets final product when detecting fault and the present invention only needs.
5, short-circuit fault current limiter of the present invention can cooperate the reclosing action.After fault disappeared, the continuous current circuit that current-limiting resistance provides can make the electric current of current-limiting inductance be reduced to the normal state current value rapidly, thereby reach the purpose of rapid cooperation reclosing.Current-limiting inductance of the present invention does not need superconduction inductance quench to come fault current limiting, and comes current limliting by series limiting resistor if adopt the superconduction inductance, and is same, is fit to very much the needs of reclosing yet.
6, the present invention has saved grid bias power supply, has formed the passive short circuit fault current limiter, and flow restricter does not cause the line current wave distortion when having guaranteed stable state simultaneously.Inductance in the circuit of the present invention can reduce thermal losses if adopt the superconduction inductance, further reduces the influence of flow restricter to circuit.Simultaneously, the cancellation of grid bias power supply has reduced the flow restricter cost, has improved the reliability of flow restricter.
Description of drawings
Fig. 1 (a), Fig. 1 (b) are the circuit theory schematic diagram of existing short-circuit fault current limiter;
Fig. 2 is the specific embodiment of the invention 1 a circuit theory schematic diagram;
Fig. 3 is the specific embodiment of the invention 2 circuit theory schematic diagrames;
Fig. 4 is the specific embodiment of the invention 3 circuit theory schematic diagrames;
Fig. 5 is the specific embodiment of the invention 4 circuit theory schematic diagrames;
Fig. 6 is the specific embodiment of the invention 5 circuit theory schematic diagrames;
Fig. 7 is the specific embodiment of the invention 6 circuit theory schematic diagrames;
Fig. 8 is the specific embodiment of the invention 7 circuit theory schematic diagrames.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is further described:
As shown in Figure 2, specific embodiments of the invention 1 are single-phase short-circuit fault current limiter.The controlled solid-state switch pipe of 1-1 K11, the controlled solid-state switch pipe of 1-2 K12, the controlled solid-state switch pipe of 1-N K1n respectively with 1-1 current-limiting resistance R11,1-2 current-limiting resistance R12,1-N current-limiting resistance R1n parallel connection, again with 1-1 diode D11,1-2 diode D12, the loop of 1-M diode D1m series connection, the controlled solid-state switch pipe of 2-1 K21, the controlled solid-state switch pipe of 2-2 K22, the controlled solid-state switch pipe of 2-N K2n respectively with 2-1 current-limiting resistance R21,2-2 current-limiting resistance R22,2-N current-limiting resistance R2n parallel connection, again with 2-1 diode D21,2-2 diode D22, the loop of 2-M diode D2m series connection, the controlled solid-state switch pipe of 3-1 K31, the controlled solid-state switch pipe of 3-2 K32, the controlled solid-state switch pipe of 3-N K3n respectively with 3-1 current-limiting resistance R31,3-2 current-limiting resistance R32,3-N current-limiting resistance R3n parallel connection, again with 3-1 diode D31,3-2 diode D32, the loop of 3-M diode D3m series connection, the controlled solid-state switch pipe of 4-1 K41, the controlled solid-state switch pipe of 4-2 K42, the controlled solid-state switch pipe of 4-N K4n respectively with 4-1 current-limiting resistance R41,4-2 current-limiting resistance R42,4-N current-limiting resistance R4n parallel connection, again with 4-1 diode D41,4-2 diode D42, the loop of 4-M diode D4m series connection, four brachium pontis forming rectifier bridge respectively, the parameter of controlled solid-state switch pipe of forming each brachium pontis is identical, the parameter of current-limiting resistance is identical, and the parameter of diode is identical.On this basis, current-limiting inductance L (common inductance or superconduction inductance) is connected the dc terminal of rectifier bridge, constitutes single-phase short-circuit fault current limiter.SW is a circuit breaker, and Vac is the line alternating current source, and R is load.
During the circuit normal state, controlled solid-state switch pipe K11, K12 ..., K1n, K21, K22 ..., K2n, K31, K32 ..., K3n, K41, K42 ..., K4n triggers by high level, with diode D11, D12 ..., D1m, D21, D22 ..., D2m, D31, D32 ..., D3m, D41, D42 ..., D4m alternately is in positively biased conducting or afterflow state, electrical network makes its equivalence be-constant-current source constantly for current-limiting inductance L charging.Current-limiting resistance R11, R12 ..., R1n, R21, R22 ..., R2n, R31, R32 ..., R3n, R41, R42 ..., R4n because of the controlled solid-state switch pipe conducting of correspondence by short circuit, make the pressure drop at flow restricter two ends be approximately zero, circuit is not impacted.
When electrical network is short-circuited fault, if fault current is a positive half cycle current, equal the current value of current-limiting inductance L when the instantaneous value of fault current, fault current will by D1m-...-D12-D11-K1n-...-K12-K11-L-D4m-...-D42-D41-K4n-...-K42-K41 conducting, current-limiting inductance L is automatically connected into the circuit current limliting, K21, K22 ..., K2n, D21, D22 ..., D2m, K31, K32 ..., K3n, D31, D32 ..., D3m is owing to the anti-cut-off state that is in partially.If fault current is a negative half-cycle current, equal the current value of current-limiting inductance L when the instantaneous value of fault current, fault current will by D3m-...-D32-D31-K3n-...-K32-K31-L-D2m-...-D22-D21-K2n-...-K22-K21 conducting, current-limiting inductance L is automatically connected into the circuit current limliting, K11, K12 ..., K1n, D11, D12 ..., D1m, K41, K42 ..., K4n, D41, D42 ..., D4m is owing to the anti-cut-off state that is in partially.-the dawn, system detected short trouble, and all switching tubes on the brachium pontis will be triggered by low level and force shutoff.At this moment, if fault current is a positive half cycle current, fault current will by D1m-...-D12-D11-R1n-...-R12-R11-L-D4m-...-D42-D41-R4n-...-R42-R41 conducting, realized the common current limliting of resistance and inductance, diode D21, D22 ..., D2n, D31, D32 ..., D3n is owing to the anti-cut-off state that is in partially.If fault current is a negative half-cycle current, fault current will by D3m-...-D32-D31-R3n-...-R32-R31-L-D2m-...-D22-D21-R2n-...-R22-R21 conducting, realized the common current limliting of resistance and inductance, diode D11, D12 ..., D1n, D41, D42 ..., D4n is owing to the anti-cut-off state that is in partially.In this current limliting process, each current-limiting resistance has reduced the design capacity of the cooling system of current-limiting resistance widely only by half-wave current.In case short trouble disappears, after system detected the fault recovery signal, the triggering level of all controlled solid-state switch pipes became high level simultaneously on the brachium pontis.Flow restricter returns to normal state, and coupled system is realized reclosing operation.From above-mentioned analysis as can be seen, the common current limliting of resistance and inductance both can the fault current limiting peak value, steady-state value that again can fault current limiting, thus more effectively limited the impact of fault current to flow restricter and circuit.
As shown in Figure 3, specific embodiments of the invention 3 are the single-phase short-circuit fault current limiter that has coupling transformer.The single-phase earthing fault occluder configurations is identical with specific embodiment 1.TR is the coupling transformer of flow restricter, and SW is a circuit breaker, and Vac is an AC power, and R is load.The single-phase earthing fault flow restricter is connected in parallel on the secondary of coupling transformer TR, constitutes the single-phase short-circuit fault current limiter that has coupling transformer; For high pressure or EHV transformer, by transformer coupled, can reduce the rated voltage and the insulation rank of power device in the flow restricter, thereby reduce the cost of flow restricter.The operation principle of the single-phase short-circuit fault current limiter that has a coupling transformer is identical with the operation principle of single-phase earthing fault flow restricter of the present invention.
As shown in Figure 4, specific embodiments of the invention 4 are that three single-phase short-circuit fault current limiters seal between a, b, c three-phase alternating-current supply Va, Vb, Vc, a, b, c three-phase breaker SW and a, b, the c threephase load R1oad three-phase fault flow restricter of composition respectively.Three single-phase earthing fault occluder configurations are identical with specific embodiment 1.The operation principle of each phase of three phase short circuit fault flow restricter is identical with the operation principle of single-phase earthing fault flow restricter of the present invention.Three single-phase earthing fault flow restricters work alone in three-phase circuit, help realizing to the flexible control of flow restricter and the reliability of raising system.
As shown in Figure 5, specific embodiments of the invention 4 are the secondary that three single-phase earthing fault flow restricters are connected in parallel on a, b, c three-phase coupling transformer Tr respectively, the former limit of a, b, c three-phase coupling transformer Tr seals in respectively between a, b, c three-phase alternating-current supply Va, Vb, Vc and a, b, the c threephase load R1oad, constitutes the short-circuit fault current limiter that three-phase has the transformation that is coupled.The single-phase short-circuit fault current limiter structure that has a coupling is identical with specific embodiment 3.The operation principle of each phase of short-circuit fault current limiter that three-phase has coupling transformer is identical with the operation principle of the single-phase short-circuit fault current limiter that has a coupling of the present invention.This short-circuit fault current limiter has the single-phase earthing fault flow restricter and has the advantage of the short-circuit fault current limiter of coupling transformer.
As shown in Figure 6, a kind of three phase short circuit fault flow restricter of specific embodiments of the invention 5 for optimizing.The three phase short circuit fault flow restricter of optimizing is made up of three-phase commutation bridge and current-limiting inductance L (common inductance or superconduction inductance).The controlled solid-state switch pipe of 1-1 K11, the controlled solid-state switch pipe of 1-2 K12, the controlled solid-state switch pipe of 1-N K1n respectively with 1-1 current-limiting resistance R11,1-2 current-limiting resistance R12,1-N current-limiting resistance R1n parallel connection, again with 1-1 diode D11,1-2 diode D12, the loop of 1-M diode D1m series connection, the controlled solid-state switch pipe of 2-1 K21, the controlled solid-state switch pipe of 2-2 K22, the controlled solid-state switch pipe of 2-N K2n respectively with 2-1 current-limiting resistance R21,2-2 current-limiting resistance R22,2-N current-limiting resistance R2n parallel connection, again with 2-1 diode D21,2-2 diode D22, the loop of 2-M diode D2m series connection, the controlled solid-state switch pipe of 3-1 K31, the controlled solid-state switch pipe of 3-2 K32, the controlled solid-state switch pipe of 3-N K3n respectively with 3-1 current-limiting resistance R31,3-2 current-limiting resistance R32,3-N current-limiting resistance R3n parallel connection, again with 3-1 diode D11,3-2 diode D32, the loop of 3-M diode D3m series connection, the controlled solid-state switch pipe of 4-1 K41, the controlled solid-state switch pipe of 4-2 K42, the controlled solid-state switch pipe of 4-N K4n respectively with 4-1 current-limiting resistance R41,4-2 current-limiting resistance R42,4-N current-limiting resistance R4n parallel connection, again with 4-1 diode D41,4-2 diode D42, the loop of 4-M diode D4m series connection, the controlled solid-state switch pipe of 5-1 K51, the controlled solid-state switch pipe of 5-2 K52, the controlled solid-state switch pipe of 5-N K5n respectively with 5-1 current-limiting resistance R51,5-2 current-limiting resistance R52,5-N current-limiting resistance R5n parallel connection, again with 5-1 diode D11,5-2 diode D52, the loop of 5-M diode D5m series connection, the controlled solid-state switch pipe of 6-1 K61, the controlled solid-state switch pipe of 6-2 K62, the controlled solid-state switch pipe of 6-N K6n respectively with 6-1 current-limiting resistance R61,6-2 current-limiting resistance R62,6-N current-limiting resistance R6n parallel connection, again with 6-1 diode D61,6-2 diode D62, the loop of 6-M diode D6m series connection, the controlled solid-state switch pipe of 7-1 K71, the controlled solid-state switch pipe of 7-2 K72, the controlled solid-state switch pipe of 7-N K7n respectively with 7-1 current-limiting resistance R71,7-2 current-limiting resistance R72,7-N current-limiting resistance R7n parallel connection, again with 7-1 diode D71,7-2 diode D72, the loop of 7-M diode D7m series connection, the controlled solid-state switch pipe of 8-1 K81, the controlled solid-state switch pipe of 8-2 K82, the controlled solid-state switch pipe of 8-N K8n respectively with 8-1 current-limiting resistance R81,8-2 current-limiting resistance R82,8-N current-limiting resistance R8n parallel connection, again with 8-1 diode D81,8-2 diode D82, each brachium pontis of rectifier bridge is formed in the loop of 8-M diode D8m series connection respectively.The points of common connection of 1-M diode D1m, 4-1 controlled solid-state switch pipe K41 and 4-1 current-limiting resistance R41, the points of common connection of 3-M diode D3m, 6-1 controlled solid-state switch pipe K61 and 6-1 current-limiting resistance R61, the points of common connection of 5-M diode D5m, 6-1 controlled solid-state switch pipe K61 and 6-1 current-limiting resistance R61, link to each other with a, b, c three phase mains Va, Vb, Vc one end respectively, the other end of a, b, c three phase mains Va, Vb, Vc is in series with a, b, c three-phase breaker SW, a, b, c threephase load Rload respectively.The points of common connection that a, b, c threephase load Rload are in series links to each other with the points of common connection of 7-M diode D7m, the controlled solid-state switch pipe of 8-1 K81 and 8-1 current-limiting resistance R81.The parameter of controlled solid-state switch pipe of forming each brachium pontis is identical, and the parameter of current-limiting resistance is identical, and the parameter of diode is identical.
During the circuit normal state, each controlled solid-state switch Guan Jun is triggered by high level, so they alternately are in positively biased conducting or afterflow state, and it is a constant-current source that electrical network makes its equivalence constantly for current-limiting inductance L charging.Current-limiting resistance all because of the controlled solid-state switch pipe conducting of correspondence by short circuit, make the pressure drop at flow restricter two ends be approximately zero, circuit is not impacted.
When electrical network is short-circuited fault (is example with the A circuitry phase), if fault current is a positive half cycle current, equal the current value of current-limiting inductance L when the instantaneous value of fault current, fault current will by D1m-...-D12-D11-K1n-...-K12-K11-L-D8m-...-D82-D81-K8n-...-K82-K81 conducting, current-limiting inductance L is automatically connected into the circuit current limliting, K21, K22 ..., K2n, D21, D22 ..., D2m, K71, K72 ..., K7n, D71, D72 ..., D7m is owing to the anti-cut-off state that is in partially.If fault current is a negative half-cycle current, equal the current value of current-limiting inductance L when the instantaneous value of fault current, fault current will by D7m-...-D72-D71-K7n-...-K72-K71-L-D2m-...-D22-D21-K2n-...-K22-K21 conducting, current-limiting inductance L is automatically connected into the circuit current limliting, K11, K12 ..., K1n, D11, D12 ..., D1m, K81, K82 ..., K8n, D81, D82 ..., D8m is owing to the anti-cut-off state that is in partially.-the dawn, system detected short trouble, and all switching tubes on the brachium pontis will be triggered by low level and force shutoff.At this moment, if fault current is a positive half cycle current, fault current will by D1m-...-D12-D11-R1n-...-R12-R11-L-D8m-...-D82-D81-R8n-...-R82-R81 conducting, realized the common current limliting of resistance and inductance, diode D21, D22 ..., D2n, D71, D72 ..., D7n is owing to the anti-cut-off state that is in partially.If fault current is a negative half-cycle current, fault current will by D7m-...-D72-D71-R7n-...-R72-R71-L-D2m-...-D22-D21-R2n-...-R22-R21 conducting, realized the common current limliting of resistance and inductance, diode D11, D12 ..., D1n, D81, D82 ..., D8n is owing to the anti-cut-off state that is in partially.In this current limliting process, each current-limiting resistance has reduced the design capacity of the cooling system of current-limiting resistance widely only by half-wave current.In case short trouble disappears, after system detected the fault recovery signal, the triggering level of all controlled solid-state switch pipes became high level simultaneously on the brachium pontis.Flow restricter returns to normal state, and coupled system is realized reclosing operation.From above-mentioned analysis as can be seen, the common current limliting of resistance and inductance both can the fault current limiting peak value, steady-state value that again can fault current limiting, thus more effectively limited the impact of fault current to flow restricter and circuit.Adopt optimized Measures, make the structure of fault current limiter of the present invention simpler, thereby reduced the manufacturing cost of system.
As shown in Figure 7, a kind of three-phase system short-circuit fault current limiter that have coupling transformer of specific embodiments of the invention 6 for optimizing.The three phase short circuit fault occluder configurations of optimizing is identical with specific embodiment 5.TR is the coupling transformer of flow restricter, and SW is a circuit breaker, and Va, Vb, Vc are three-phase alternating-current supply, and R is the threephase load equivalent resistance.The three phase short circuit fault flow restricter of optimizing is connected in parallel on the secondary of a, b, c three-phase coupling transformer TR respectively, the former limit of a, b, c three-phase coupling transformer Tr seals in respectively between a, b, c three-phase alternating-current supply Va, Vb, Vc and a, b, the c threephase load Rload, constitutes the three-phase system short-circuit fault current limiter of optimizing that has coupling transformer.For high pressure or EHV transformer, by transformer coupled, can reduce the rated voltage and the insulation rank of power device in the flow restricter, thereby reduce the cost of flow restricter.The operation principle of the operation principle of the three-phase system short-circuit fault current limiter of optimizing that has coupling transformer and the three phase short circuit fault flow restricter of optimization is identical.
As shown in Figure 8, specific embodiments of the invention 7 are a kind of asymmetric single-phase earthing fault flow restricter.The controlled solid-state switch pipe of 1-1 K11, the controlled solid-state switch pipe of 1-2 K12, the controlled solid-state switch pipe of 1-N K1n respectively with 1-1 current-limiting resistance R11,1-2 current-limiting resistance R12,1-N current-limiting resistance R1n parallel connection, again with 1-1 diode D11,1-2 diode D12, the loop of 1-M diode D1m series connection, 2-1 diode D21,2-2 diode D22, the loop of 2-S diode D2s series connection, the controlled solid-state switch pipe of 3-1 K31, the controlled solid-state switch pipe of 3-2 K32, the controlled solid-state switch pipe of 3-N K3n respectively with 3-1 current-limiting resistance R31,3-2 current-limiting resistance R32,3-N current-limiting resistance R3n parallel connection, again with 3-1 diode D31,3-2 diode D32, the loop of 3-M diode D3m series connection, 4-1 diode D41,4-2 diode D42, four brachium pontis of rectifier bridge are formed in the loop of 4-S diode D4s series connection respectively, the parameter of controlled solid-state switch pipe of forming each brachium pontis is identical, the parameter of current-limiting resistance is identical, and the parameter of diode is identical.On this basis, current-limiting inductance L (common inductance or superconduction inductance) is connected the dc terminal of rectifier bridge, constitutes single-phase short-circuit fault current limiter.
During the circuit normal state, controlled solid-state switch pipe K11, K12 ..., K1n, K31, K32 ..., K3n triggers by high level, with diode D11, D12 ..., D1m, D21, D22 ..., D2s, D31, D32 ..., D3m, D41, D42 ..., D4s alternately is in positively biased conducting or afterflow state, it is a constant-current source that electrical network makes its equivalence constantly for current-limiting inductance L charging.Current-limiting resistance R11, R12 ..., R1n, R31, R32 ..., R3n because of the controlled solid-state switch pipe conducting of correspondence by short circuit, make the pressure drop at flow restricter two ends be approximately zero, circuit is not impacted.
When electrical network is short-circuited fault, if fault current is a positive half cycle current, equal the current value of current-limiting inductance L when the instantaneous value of fault current, fault current will by D1m-...-D12-D11-K1n-...-K12-K11-L-D4s-...-D42-D41 conducting, current-limiting inductance L is automatically connected into the circuit current limliting, D21, D22 ..., D2s, K31, K32 ..., K3n, D31, D32 ..., D3m is owing to the anti-cut-off state that is in partially.If fault current is a negative half-cycle current, equal the current value of current-limiting inductance L when the instantaneous value of fault current, fault current will by D3m-...-D32-D31-K3n-...-K32-K31-L-D2m-...-D22-D21 conducting, current-limiting inductance L is automatically connected into the circuit current limliting, K11, K12 ..., K1n, D11, D12 ..., D1m, D41, D42 ..., D4s is owing to the anti-cut-off state that is in partially.In case system detects short trouble, all switching tubes on the brachium pontis will be triggered by low level and force shutoff.At this moment, if fault current is a positive half cycle current, fault current will by D1m-...-D12-D11-R1n-...-R12-R11-L-D4m-...-D42-D41 conducting, realized the common current limliting of resistance and inductance, diode D21, D22 ..., D2s, D31, D32 ..., D3m is owing to the anti-cut-off state that is in partially.If fault current is a negative half-cycle current, fault current will by D3m-...-D32-D31-R3n-...-R32-R31-L-D2s-...-D22-D21 conducting, realized the common current limliting of resistance and inductance, diode D11, D12 ..., D1m, D41, D42 ..., D4s is owing to the anti-cut-off state that is in partially.In this current limliting process, each current-limiting resistance has reduced the design capacity of the cooling system of current-limiting resistance widely only by half-wave current.In case short trouble disappears, after system detected the fault recovery signal, the triggering level of all controlled solid-state switch pipes became high level simultaneously on the brachium pontis.Flow restricter returns to normal state, and coupled system is realized reclosing operation.From above-mentioned analysis as can be seen, the common current limliting of resistance and inductance both can the fault current limiting peak value, steady-state value that again can fault current limiting, thus more effectively limited the impact of fault current to flow restricter and circuit.
Test is finished in three-phase 380V AC system.Current-limiting inductance L is the high-temperature superconductor inductance, L=10mH.Parameter m=n=3, s=6, the resistance R1=1 Ω of each current-limiting resistance, power diode are MDF150A, controlled solid-state switch pipe is DGT304, when the stable state fault current can be limited in no short-circuit fault current limiter about 40% of fault current.When if the resistance R1=2 Ω of current-limiting resistance, stable state fault current section are limited in no short-circuit fault current limiter about 15% of fault current.
Claims (9)
1, a kind of short-circuit fault current limiter, comprise single-phase rectification bridge and the current-limiting inductance (L) formed by diode, controlled solid-state switch pipe and current-limiting resistance, it is characterized in that on the brachium pontis of single-phase rectification bridge, current-limiting resistance and controlled solid-state switch pipe are in parallel, a plurality of shunt circuits are in series, and connect with diode again; Four brachium pontis of single-phase rectification bridge are respectively by the controlled solid-state switch pipe of 1-1 (K11), the controlled solid-state switch pipe of 1-2 (K12), the controlled solid-state switch pipe of 1-N (K1n) respectively with 1-1 current-limiting resistance (R11), 1-2 current-limiting resistance (R12), 1-N current-limiting resistance (R1n) parallel connection, again with 1-1 diode (D11), 1-2 diode (D12), the loop of 1-M diode (D1m) series connection, the controlled solid-state switch pipe of 2-1 (K21), the controlled solid-state switch pipe of 2-2 (K22), the controlled solid-state switch pipe of 2-N (K2n) respectively with 2-1 current-limiting resistance (R21), 2-2 current-limiting resistance (R22), 2-N current-limiting resistance (R2n) parallel connection, again with 2-1 diode (D21), 2-2 diode (D22), the loop of 2-M diode (D2m) series connection, the controlled solid-state switch pipe of 3-1 (K31), the controlled solid-state switch pipe of 3-2 (K32), the controlled solid-state switch pipe of 3-N (K3n) respectively with 3-1 current-limiting resistance (R31), 3-2 current-limiting resistance (R32), 3-N current-limiting resistance (R3n) parallel connection, again with 3-1 diode (D31), 3-2 diode (D32), the loop of 3-M diode (D3m) series connection, the controlled solid-state switch pipe of 4-1 (K41), the controlled solid-state switch pipe of 4-2 (K42), the controlled solid-state switch pipe of 4-N (K4n) respectively with 4-1 current-limiting resistance (R41), 4-2 current-limiting resistance (R42), 4-N current-limiting resistance (R4n) parallel connection is again with 4-1 diode (D41), 4-2 diode (D42), the loop of 4-M diode (D4m) series connection is formed; Current-limiting inductance (L) is connected the dc terminal of single-phase rectification bridge.
2, according to the described short-circuit fault current limiter of claim 1, the controlled solid-state switch pipe that it is characterized in that forming flow restricter is GTO or IGBT or IGCT, the parameter of each controlled solid-state switch pipe is identical, and the parameter of each diode is identical, and the parameter of each current-limiting resistance is identical.
3, according to the described short-circuit fault current limiter of claim 1, the points of common connection that it is characterized in that 1-M diode (D1m), the controlled solid-state switch pipe of 2-1 (K21) and the 2-1 current-limiting resistance (R21) of short-circuit fault current limiter links to each other with AC power (Vac), the points of common connection of 3-M diode (D3m), the controlled solid-state switch pipe of 4-1 (K41) and 4-1 current-limiting resistance (R41) links to each other with an end of circuit breaker (SW), the other end of circuit breaker (SW) links to each other with load (Rload), constitutes single-phase short-circuit fault current limiter.
4, according to the described short-circuit fault current limiter of claim 3, it is characterized in that described single-phase short-circuit fault current limiter is connected in parallel on the secondary of coupling transformer (Tr), the former limit of coupling transformer (Tr) seals between AC power (Vac) and the load (Rload), constitutes the single-phase short-circuit fault current limiter that has the transformation that is coupled.
5, according to the described short-circuit fault current limiter of claim 3, it is characterized in that three described single-phase short-circuit fault current limiters seal in respectively between a, b, c three-phase alternating-current supply (Va, Vb, Vc), three-phase breaker (SW) and the threephase load (Rload), constitute the short-circuit fault current limiter of three-phase.
6, according to the described short-circuit fault current limiter of claim 3, it is characterized in that three described single-phase earthing fault flow restricters are connected in parallel on the secondary of a, b, c three-phase coupling transformer (Tr) respectively, the former limit of a, b, c three-phase coupling transformer (Tr) seals in respectively between a, b, c three-phase alternating-current supply (Va, Vb, Vc) and a, b, the c threephase load (Rload), constitutes the short-circuit fault current limiter that three-phase has the transformation that is coupled.
7, any one described short-circuit fault current limiter according to claim 1 to 3, four brachium pontis that it is characterized in that rectifier bridge are respectively by the controlled solid-state switch pipe of 1-1 (K11), the controlled solid-state switch pipe of 1-2 (K12), the controlled solid-state switch pipe of 1-N (K1n) respectively with 1-1 current-limiting resistance (R11), 1-2 current-limiting resistance (R12), 1-N current-limiting resistance (R1n) parallel connection, again with 1-1 diode (D11), 1-2 diode (D12), the loop of 1-M diode (D1m) series connection, 2-1 diode (D21), 2-2 diode (D22), the loop of 2-S diode (D2s) series connection, the controlled solid-state switch pipe of 3-1 (K31), the controlled solid-state switch pipe of 3-2 (K32), the controlled solid-state switch pipe of 3-N (K3n) respectively with 3-1 current-limiting resistance (R31), 3-2 current-limiting resistance (R32), 3-N current-limiting resistance (R3n) parallel connection, again with 3-1 diode (D31), 3-2 diode (D32), the loop of 3-M diode (D3m) series connection, 4-1 diode (D41), 4-2 diode (D42), the loop of 4-S diode (D4s) series connection is formed, and constitutes asymmetric single-phase earthing fault flow restricter.
8, a kind of short-circuit fault current limiter, it is characterized in that forming the three phase short circuit fault flow restricter by three-phase commutation bridge and current-limiting inductance (L), wherein, each brachium pontis of three-phase commutation bridge is respectively by the controlled solid-state switch pipe of 1-1 (K11), the controlled solid-state switch pipe of 1-2 (K12), the controlled solid-state switch pipe of 1-N (K1n) respectively with 1-1 current-limiting resistance (R11), 1-2 current-limiting resistance (R12), 1-N current-limiting resistance (R1n) parallel connection, again with 1-1 diode (D11), 1-2 diode (D12), the loop of 1-M diode (D1m) series connection, the controlled solid-state switch pipe of 2-1 (K21), the controlled solid-state switch pipe of 2-2 (K22), the controlled solid-state switch pipe of 2-N (K2n) respectively with 2-1 current-limiting resistance (R21), 2-2 current-limiting resistance (R22), 2-N current-limiting resistance (R2n) parallel connection, again with 2-1 diode (D21), 2-2 diode (D22), the loop of 2-M diode (D2m) series connection, the controlled solid-state switch pipe of 3-1 (K31), the controlled solid-state switch pipe of 3-2 (K32), the controlled solid-state switch pipe of 3-N (K3n) respectively with 3-1 current-limiting resistance (R31), 3-2 current-limiting resistance (R32), 3-N current-limiting resistance (R3n) parallel connection, again with 3-1 diode (D11), 3-2 diode (D32), the loop of 3-M diode (D3m) series connection, the controlled solid-state switch pipe of 4-1 (K41), the controlled solid-state switch pipe of 4-2 (K42), the controlled solid-state switch pipe of 4-N (K4n) respectively with 4-1 current-limiting resistance (R41), 4-2 current-limiting resistance (R42), 4-N current-limiting resistance (R4n) parallel connection, again with 4-1 diode (D41), 4-2 diode (D42), the loop of 4-M diode (D4m) series connection, the controlled solid-state switch pipe of 5-1 (K51), the controlled solid-state switch pipe of 5-2 (K52), the controlled solid-state switch pipe of 5-N (K5n) respectively with 5-1 current-limiting resistance (R51), 5-2 current-limiting resistance (R52), 5-N current-limiting resistance (R5n) parallel connection, again with 5-1 diode (D11), 5-2 diode (D52), the loop of 5-M diode (D5m) series connection, the controlled solid-state switch pipe of 6-1 (K61), the controlled solid-state switch pipe of 6-2 (K62), the controlled solid-state switch pipe of 6-N (K6n) respectively with 6-1 current-limiting resistance (R61), 6-2 current-limiting resistance (R62), 6-N current-limiting resistance (R6n) parallel connection, again with 6-1 diode (D61), 6-2 diode (D62), the loop of 6-M diode (D6m) series connection, the controlled solid-state switch pipe of 7-1 (K71), the controlled solid-state switch pipe of 7-2 (K72), the controlled solid-state switch pipe of 7-N (K7n) respectively with 7-1 current-limiting resistance (R71), 7-2 current-limiting resistance (R72), 7-N current-limiting resistance (R7n) parallel connection, again with 7-1 diode (D71), 7-2 diode (D72), the loop of 7-M diode (D7m) series connection, the controlled solid-state switch pipe of 8-1 (K81), the controlled solid-state switch pipe of 8-2 (K82), the controlled solid-state switch pipe of 8-N (K8n) respectively with 8-1 current-limiting resistance (R81), 8-2 current-limiting resistance (R82), 8-N current-limiting resistance (R8n) parallel connection is again with 8-1 diode (D81), 8-2 diode (D82), the loop of 8-M diode (D8m) series connection is formed; 1-M diode (D1m), the points of common connection of controlled solid-state switch pipe of 4-1 (K41) and 4-1 current-limiting resistance (R41), 3-M diode (D3m), the points of common connection of controlled solid-state switch pipe of 6-1 (K61) and 6-1 current-limiting resistance (R61), 5-M diode (D5m), the points of common connection of controlled solid-state switch pipe of 6-1 (K61) and 6-1 current-limiting resistance (R61), respectively with a, b, c three phase mains (Va, Vb, Vc) end links to each other, a, b, c three phase mains (Va, Vb, Vc) the other end respectively with a, b, c three-phase breaker (SW) and a, b, c threephase load (Rload) is in series a, b, points of common connection that c threephase load (Rload) is in series and 7-M diode (D7m), the points of common connection of controlled solid-state switch pipe of 8-1 (K81) and 8-1 current-limiting resistance (R81) links to each other.
9, according to the described short-circuit fault current limiter of claim 8, its feature constitutes the three-phase fault flow restricter that has coupling transformer by three coupling transformers (Tr) and three phase short circuit fault flow restricter.
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| JP3000981B2 (en) * | 1997-11-14 | 2000-01-17 | 日新電機株式会社 | High speed current limiter |
| CN1571233A (en) * | 2004-04-29 | 2005-01-26 | 浙江大学 | A power electronic type short-circuit fault current limiter |
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| JP3000981B2 (en) * | 1997-11-14 | 2000-01-17 | 日新電機株式会社 | High speed current limiter |
| CN1571233A (en) * | 2004-04-29 | 2005-01-26 | 浙江大学 | A power electronic type short-circuit fault current limiter |
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