CN105207208A - Circuit achieving power flow control and small current ground fault active compensation arc suppression simultaneously - Google Patents
Circuit achieving power flow control and small current ground fault active compensation arc suppression simultaneously Download PDFInfo
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- CN105207208A CN105207208A CN201510602073.2A CN201510602073A CN105207208A CN 105207208 A CN105207208 A CN 105207208A CN 201510602073 A CN201510602073 A CN 201510602073A CN 105207208 A CN105207208 A CN 105207208A
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Abstract
A circuit achieving power flow control and small current ground fault active compensation arc suppression simultaneously is characterized by comprising a three-phase parallel module, a first coupling transformer, a three-phase serial module, a second coupling transformer and a direct current bus voltage stabilizing unit; when power flow control is conducted, the three-phase parallel module and the first coupling transformer are used for providing active power balance for the interior of the circuit and conducting reactive compensation on the circuit through the first coupling transformer, and when active compensation arc suppression is conducted, the three-phase parallel module and the first coupling transformer are used for providing a zero-sequence compensation current for a small current ground fault; when power flow control is conducted, voltage is inserted into a power distribution system circuit through the second coupling transformer to change power flow; the direct current bus voltage stabilizing unit connects the three-phase serial module with the three-phase parallel module and is used for providing stable direct current voltage for the direct current side of the three-phase serial module and the direct current side of the three-phase parallel module. According to the circuit achieving power flow control and small current ground fault active compensation arc suppression simultaneously, by means of the three-phase parallel module, the three-phase serial module and the direct current bus voltage stabilizing unit, the functions of power flow control small current ground fault active compensation can be achieved simultaneously.
Description
Technical field
Realize the circuit of power flowcontrol and low current grounding active compensation extinguishing arc simultaneously, belong to intermediate distribution system field.
Background technology
Along with the development of science and technology and the progress of society, various distributed power source is increasing, and cause power distribution network scale constantly to expand, operational mode is day by day complicated.Early stage only exist serious trend flow field problem in transmission system, and in recent years due in a large amount of input distribution systems of distributed power source and microgrid, the trend flow field problem of distribution system became more serious.In intermediate distribution system, earth fault occurs often simultaneously, impacts, even cause power outage to distribution system.In earth fault, the fault of about 70% is transient single-phase earth fault, for small current neutral grounding system, system can be with single phase ground fault to run two hours, but when current in the fault point is larger, electric arc is difficult to self-extinguish, easily produces fault overvoltage, cause multiple accident, transformer and switch cubicle may be burnt, cause large area blackout, cause great economic loss.
For the power flowcontrol problem of intermediate distribution system, the existing power electronic equipment UPFC(THE UPFC being applied to transmission system can be utilized), UPFC can solve the various functions such as voltage fluctuation, reactive power compensation, power flowcontrol preferably, but cannot process for earth fault.For reducing single-phase earth fault current, the electrical network of portion voltage grade adopts neutral non-effective grounding mode usually, comprise isolated neutral and through grounding through arc, when there is single phase ground fault, fault current is less, electrical network can be allowed to continue a period of time that operates with failure, but low current grounding may cause the extinguishing of electric arc, restrike, so repeatedly can cause larger system overvoltage, cause great hazardous accidents.Therefore active compensation extinguishing arc is carried out to low current grounding, by Single-phase Ground Connection Failure current compensation to zero, guarantee that fault point 100% blow-out is significant.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, provides a kind of by parallel three phase module, three-phase series module and DC bus voltage regulation unit, can realize the circuit of power flowcontrol and low current grounding active compensation extinguishing arc simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: this realizes the circuit of power flowcontrol and low current grounding active compensation extinguishing arc simultaneously, it is characterized in that: comprising:
First coupling transformer, three groups of former limit windings are connected in parallel on distribution system A, between B, C three-phase line and earth terminal respectively;
Parallel three phase module, comprises AC and DC side, and its AC is connected with the first coupling transformer vice-side winding respectively, for being realized reactive power compensation and the active compensation extinguishing arc of electrical network by the first coupling transformer;
DC bus voltage regulation unit, one end is connected with the DC side of parallel three phase module, for realizing DC voltage-stabilizing and providing passage for exporting zero sequence compensation electric current;
Three-phase series module, comprises AC and DC side, and its DC side is connected with the other end of DC bus voltage regulation unit, changes trend flowing for inserting voltage by the second coupling transformer to distribution system;
Second coupling transformer, its former limit winding is connected between three-phase series module AC and earth terminal, and vice-side winding is connected in distribution system A, B, C three-phase line respectively.
Preferably, described parallel three phase module comprises for the parallel three phase filter unit of filtering high order harmonic component, parallel three phase current transforming unit and the current control unit that controls parallel three phase current transforming unit; The AC of parallel three phase current transforming unit passes through the first coupling transformer described in the connection of parallel filtering unit, the DC bus voltage regulation unit described in DC side connection of parallel three phase current transforming unit.
Preferably, described three-phase series module comprises for the series filtering unit of high order harmonic component in filtering three-phase series current transforming unit output voltage, three-phase series current transforming unit and the voltage control unit that controls three-phase series current transforming unit; The AC of three-phase series current transforming unit connects the former limit winding of described second coupling transformer by series filtering unit, the DC bus voltage regulation unit described in DC side connection of three-phase series current transforming unit.
Preferably, described parallel three phase current transforming unit adopts three phase bridge all control circuit, comprise IGBT pipe G1 ~ G6 and diode D1 ~ D6, the collector electrode of parallel IGBT pipe G1, IGBT pipe G3, IGBT pipe G5 while of parallel three phase current transforming unit DC side positive pole, the emitter of parallel IGBT pipe G2, IGBT pipe G4, IGBT pipe G6 while of parallel three phase current transforming unit DC side negative pole; The emitter of IGBT pipe G1, IGBT pipe G3, IGBT pipe G5 connects the collector electrode of IGBT pipe G2, IGBT pipe G4, IGBT pipe G6 respectively and the AC of drawing parallel three phase current transforming unit is respectively connected with parallel filtering unit;
The negative electrode of diode D1 ~ D6 connects the collector electrode of IGBT pipe G1 ~ G6 respectively, and the anode of diode D1 ~ D6 connects the emitter of IGBT pipe G1 ~ G6 respectively, and the gate pole of IGBT pipe G1 ~ G6 is connected with described current control unit simultaneously.
Preferably, described parallel filtering unit adopts the parallel three phase LC second-order filter circuit be made up of electric capacity C1 ~ C3 and inductance L 1 ~ L3, three groups of vice-side winding shunt inductance L1 and electric capacity C1 respectively of the first coupling transformer, one end of inductance L 2 and electric capacity C2 and inductance L 3 and electric capacity C3, the other end ground connection of electric capacity C1 ~ C3, the other end of inductance L 1 ~ L3 connects the AC of parallel three phase current transforming unit respectively.
Preferably, described three-phase series current transforming unit adopts three phase bridge all control circuit, comprise IGBT pipe G1 ' ~ G6 ' and diode D1 ' ~ D6 ', three-phase series current transforming unit DC side positive pole is parallel IGBT pipe G1 ' simultaneously, IGBT pipe G3 ', the collector electrode of IGBT pipe G5 ', three-phase series current transforming unit DC side negative pole is parallel IGBT pipe G2 ' simultaneously, IGBT pipe G4 ', the emitter of IGBT pipe G6 ', IGBT pipe G1 ', IGBT pipe G3 ', the emitter of IGBT pipe G5 ' connects IGBT pipe G2 ' respectively, IGBT pipe G4 ', the collector electrode of IGBT pipe G6 ' the AC of drawing three-phase series current transforming unit are respectively connected with series filtering unit,
The negative electrode parallel IGBT pipe G1 ' ~ G6 ' collector electrode respectively of diode D1 ' ~ D6 ', the emitter of anode difference parallel IGBT pipe the G1 ' ~ G6 ' of diode D1 ' ~ D6 ', IGBT pipe G1 ' ~ G6 ' gate pole is connected with described voltage control unit simultaneously.
Preferably, described series filtering unit comprises the three-phase series LC second-order filter circuit be made up of electric capacity C4 ~ C6 and inductance L 4 ~ L6, one end of difference the second coupling transformer in parallel three groups of former limit windings and one end of electric capacity C4 ~ C6 after the AC difference series inductance L4 ~ L6 of three-phase series current transforming unit, the other end ground connection of electric capacity C4 ~ C6, the other end of the second coupling transformer three groups former limit winding is by K switch 2 ground connection.
Preferably, supporting two storage battery and the double-energy storage element of DC bus side voltage when described DC bus voltage regulation unit is included in active compensation extinguishing arc, in the middle of double-energy storage element, draw the direct ground connection of center line, providing passage for exporting zero sequence compensation electric current.
Preferably, described two storage batterys are storage batteries D C1 and DC2, and described double-energy storage element is storage capacitor C7 ~ C8;
The positive pole of the positive pole of parallel three phase module the DC side positive pole of multiple-connected battery DC1, one end of electric capacity C7 and the DC side of three-phase series module simultaneously, the negative pole of the negative pole of parallel three phase module the DC side negative pole of multiple-connected battery DC2, one end of electric capacity C8 and the DC side of three-phase series module simultaneously, earth terminal is the negative pole of multiple-connected battery DC1, the positive pole of storage batteries D C2 and the other end of electric capacity C7 ~ C8 simultaneously, draws the direct ground connection of center line between electric capacity C7 and C8.
Preferably, the former vice-side winding of the second described coupling transformer adopts star neutral point directly to connect mode.
Compared with prior art, the beneficial effect that the present invention has is:
1, realized the circuit of power flowcontrol and low current grounding active compensation extinguishing arc by this simultaneously, by parallel three phase module, three-phase series module and DC bus voltage regulation unit, the function of power flowcontrol and low current grounding active compensation can be realized simultaneously.When electrical network generation single phase ground fault, zero sequence compensation electric current needed for can being injected to electrical network by parallel three phase module and DC bus voltage regulation unit direct-flow storage battery, current in the fault point is compensated to zero, and whether time delay reduction Injection Current failure judgement is recovered.The self-healing in time of transient fault energy, permanent fault then carries out isolation maintenance.When not breaking down, being the storage capacitor charging of DC bus side by parallel three phase module, inserting voltage by three-phase series module to electrical network and change power flow distribution, improve electric power utilization ratio.
2, parallel three phase current transforming unit adopts three phase bridge all control circuit, there is higher switching frequency, rectification state and inverter mode can be operated in, being operated in rectification state during the non-fault of electrical network is that capacitor in DC bus voltage regulation unit charges, stable DC bus bar side voltage and being compensated by the reactive power of the first coupling transformer in parallel to circuit.When there is single phase ground fault in electrical network, parallel three phase current transforming unit is operated in inverter mode, injects zero-sequence current carry out active compensation extinguishing arc to electrical network.
3, three-phase series current transforming unit adopts three phase bridge all control circuit equally, and same employing IGBT and diode inverse parallel, as switching device, have higher switching frequency.The AC of series AC unit is connected with the former limit winding of the second coupling transformer, inserts amplitude and the phase place that voltage changes circuit output end voltage by the second coupling transformer to electrical network, thus the distribution of load disturbance.
4, the parallel filtering unit in parallel three phase module, when parallel three phase current transforming unit is operated in rectification state for the high order harmonic component that filtering electrical network flows into, exports for filtering when parallel three phase current transforming unit is operated in inverter mode and open by switching device the high order harmonic component turning off and cause in zero sequence compensation electric current.
5, the series filtering unit in three-phase series module, can high order harmonic component in filtering three-phase series current transforming unit output voltage.
6, the withstand voltage of switching device can be reduced by the first coupling transformer and the second coupling transformer and three-phase connection in series-parallel convertor circuit and power network line are isolated.
7, DC bus voltage regulation unit, when distribution system does not break down by three-phase series module be energy storage device charging, direct-flow storage battery does not come into operation, when distribution system generation single phase ground fault, direct current electric power storage is come into operation as parallel three phase module inversion output zero sequence compensation electric current provides DC voltage to support, when distribution system generation power outage, direct-flow storage battery is come into operation and is played the effect of uninterrupted power supply in short-term by the inversion of parallel three phase module.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc.
Fig. 2 is the circuit structure diagram simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc.
Fig. 3 is the circuit parallel three phase current transforming unit circuit structure diagram simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc.
Fig. 4 is the circuit three-phase series current transforming unit circuit structure diagram simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc.
Fig. 5 is the circuit working principle flow chart simultaneously realizing power flowcontrol and low current grounding active compensation.
Fig. 6 is distribution power flow control waveform figure.
Fig. 7 is three-phase line wave simulation figure when not carrying out voltage control.
Fig. 8 is for carrying out three-phase line wave simulation figure after voltage control.
A cross streams electrical waveform figure when Fig. 9 is for the non-active compensation extinguishing arc of single phase ground fault occurs.
Figure 10 is A cross streams electrical waveform figure after generation single phase ground fault active compensation extinguishing arc.
Embodiment
Fig. 1 ~ 10 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 10, the present invention will be further described.
As shown in Figure 1, realize the circuit of power flowcontrol and low current grounding active compensation extinguishing arc simultaneously, comprise the first coupling transformer, parallel filtering unit, parallel three phase current transforming unit, DC bus voltage regulation unit, three-phase series current transforming unit, series filtering unit, the second coupling transformer, voltage control unit and current control unit.The former limit winding of the first coupling transformer is connected with A, B, C three-phase line of distribution system respectively.The vice-side winding of the first coupling transformer connects one end of parallel filtering unit, the other end of parallel filtering unit connects the AC of parallel three phase current transforming unit, the DC side of parallel three phase current transforming unit connects one end of DC bus voltage regulation unit, the other end of DC bus voltage regulation unit connects the DC side of three-phase series current transforming unit, the AC of three-phase series filter unit connects the former limit winding of the second coupling transformer, and the vice-side winding of the second coupling transformer accesses in A, B, C three-phase line of distribution system respectively.
Parallel three phase current transforming unit adopts three phase bridge all control circuit, wherein adopts IGBT and diode inverse parallel as switching device, has higher switching frequency.Convertor circuit in parallel can be operated in rectification state and inverter mode, being operated in rectification state during the non-fault of electrical network is that capacitor in DC bus voltage regulation unit charges, stable DC bus bar side voltage and being compensated by the reactive power of the first coupling transformer in parallel to circuit.When there is single phase ground fault in electrical network, parallel three phase current transforming unit is operated in inverter mode, injects zero-sequence current carry out active compensation extinguishing arc to electrical network.
In parallel three phase current transforming unit, the gate electrode drive signals of each switching device is given by current control unit, and current control unit realizes by the IGBT control circuit of routine, is provided with Current Detection Algorithm and current Control Algorithm in main control chip within it.Current Detection Algorithm refers to that main control chip is by detecting the parameter of circuit secondary side, and calculates the amplitude and the phase place that need the earth current compensated when determining single phase ground fault occurs.Current Control Algorithm is amplitude and the phase place of the earth current of the needs compensation that basis calculates, and produces corresponding pwm signal and drives parallel three phase current transforming unit breaker in middle device gate pole, export the set-point of required compensation.
Parallel filtering unit adopts parallel three phase LC second-order filter circuit, parallel three phase LC second-order filter circuit one end is directly connected with parallel three phase current transforming unit AC, when parallel three phase current transforming unit is operated in rectification state, parallel filtering unit is used for the high order harmonic component that filtering electrical network flows into, when parallel three phase current transforming unit is operated in inverter mode, parallel filtering unit is used for filtering and exports and open by switching device the high order harmonic component turning off and cause in zero sequence compensation electric current.The other end of parallel three phase LC second-order filter circuit is connected with the vice-side winding of the first coupling transformer, the use of the first coupling transformer can reduce the withstand voltage of switching device and convertor circuit in parallel and power network line be isolated, its former secondary all adopts star direct grounding way, there is provided passage for exporting zero sequence compensation electric current, former limit three-phase is directly connected with A, B, C three-phase line of distribution system.
DC bus voltage regulation unit comprises two direct-flow storage battery and double-energy storage electric capacity, and center line is drawn and direct ground connection, for zero-sequence current provides passage between double-energy storage electric capacity.When not breaking down, parallel three phase current transforming unit is the double-energy storage capacitor charging in DC bus voltage regulation unit, and storage capacitor plays main DC pressure stabilization function.When there is single phase ground fault, direct-flow storage battery has dropped into the function of support DC bus side voltage when carrying out active compensation to low current grounding, power network line break down cause circuit no-voltage time direct-flow storage battery dropped into the effect of instantaneous stand-by power supply; DC bus voltage stabilizing circuit is connected with the DC side of three-phase series current transforming unit simultaneously.
Three-phase series current transforming unit adopts three phase bridge all control circuit equally, and same employing IGBT and diode inverse parallel, as switching device, have higher switching frequency.The AC of series AC unit is connected with the former limit winding of the second coupling transformer, inserts amplitude and the phase place that voltage changes circuit output end voltage by the second coupling transformer to electrical network, thus the distribution of load disturbance.
The gate electrode drive signals of each switching device of series connection convertor circuit is given by voltage control unit, voltage control unit realizes by the IGBT control circuit of routine equally, voltage detecting algorithm and voltage control algorithm is provided with in main control chip within it, voltage detecting algorithm refers to that main control chip is by detecting the parameter of circuit secondary side, detects the amplitude and the phase place that obtain power network line voltage.Voltage control is calculated to send out and is referred to that main control chip produces corresponding pwm signal driving switch device gate pole according to the output voltage of line transmission power flow requirement determination circuit, the magnitude of voltage needed for output.
Series filtering unit adopts three-phase series LC second-order filter circuit, and one end of three-phase series LC second-order filter circuit is directly connected with three-phase series current transforming unit AC, for the high order harmonic component in filtering three-phase series current transforming unit output voltage.The other end of three-phase series LC second-order filter circuit and the second coupling transformer former limit winding switching, the use of the second coupling transformer can reduce the withstand voltage of switching device and series connection convertor circuit and power network line be isolated, the former vice-side winding of the second coupling transformer adopts star-star connection mode, neutral-point solid ground or earth-free (depending on the state of K switch 2), the three-phase of the vice-side winding of the second coupling transformer seals in A, B, C three-phase line of distribution system respectively.
As shown in Figure 2, transformer T2 is the first above-mentioned coupling transformer, and three groups of former limit winding N1 of transformer T2 are in parallel respectively to be accessed in electrical network A, B, C three-phase, and three groups of corresponding vice-side winding N2 of transformer T2 access in above-mentioned parallel filtering unit.Reduced the withstand voltage of parallel three phase current transforming unit breaker in middle device by transformer T2, parallel three phase current transforming unit and electrical network are isolated, improve system safety stability.
Parallel filtering unit comprises inductance L 1 ~ L2, electric capacity C1 ~ C3, accesses one end of vice-side winding corresponding to the former limit winding of A cross streams electricity shunt capacitance C1 and inductance L 1 simultaneously, the other end ground connection of electric capacity C1 in transformer T2 with parallel connection; One end of vice-side winding corresponding to the former limit winding of B cross streams electricity shunt capacitance C2 and inductance L 2 simultaneously is accessed with parallel connection, the other end ground connection of electric capacity C2 in transformer T2; Access one end of vice-side winding corresponding to the former limit winding of C cross streams electricity shunt capacitance C3 and inductance L 3 simultaneously with parallel connection in transformer T2, the other end ground connection of electric capacity C3, the other end of inductance L 1 ~ L3 accesses in above-mentioned parallel three phase current transforming unit simultaneously, by parallel filtering unit, the high order harmonic component that filtering electrical network flows into and the high order harmonic component exported in active compensation electric current, and serial inductance wherein affects the capacity of convertor circuit in parallel.
As shown in Figure 3, parallel three phase current transforming unit comprises IGBT pipe G1 ~ G6, diode D1 ~ D6, the AC of parallel three phase current transforming unit is A, B, C three-phase line of the distribution system introduced respectively by above-mentioned inductance L 1 ~ L3, and DC side draws direct-flow positive pole and negative pole respectively.The negative electrode of parallel filtering unit DC side the positive pole simultaneously collector electrode of parallel IGBT pipe G1, IGBT pipe G3, IGBT pipe G5 and diode D1, diode D3, diode D5.The collector electrode of IGBT pipe G1 and the anode of diode D1 be the collector electrode of parallel IGBT pipe G2, the negative electrode of diode D2 and above-mentioned inductance L 1 simultaneously; The collector electrode of IGBT pipe G3 and the anode of diode D3 be the collector electrode of parallel IGBT pipe G4, the negative electrode of diode D4 and above-mentioned inductance L 2 simultaneously; The collector electrode of IGBT pipe G5 and the anode of diode D5 be the collector electrode of parallel IGBT pipe G6, the negative electrode of diode D6 and above-mentioned inductance L 3 simultaneously.The anode of parallel three phase current transforming unit DC side the negative pole simultaneously emitter of parallel IGBT pipe G2, IGBT pipe G4, IGBT pipe G6 and diode D2, diode D4, diode D6.The gate pole of IGBT pipe G1 ~ G6 is connected with above-mentioned current control unit (module U1) simultaneously and realizes controlling.
As shown in Figure 2, above-mentioned DC bus voltage regulation unit comprises storage batteries D C1 ~ DC2, storage capacitor C7 ~ C8.The positive pole of parallel three phase current transforming unit DC side is the positive pole of multiple-connected battery DC1, one end of electric capacity C7 and the positive pole of three-phase series current transforming unit DC side simultaneously, the negative pole of parallel three phase current transforming unit DC side is the negative pole of multiple-connected battery DC2, one end of electric capacity C8 and the negative pole of three-phase series current transforming unit DC side simultaneously, and earth terminal is the negative pole of multiple-connected battery DC1, the positive pole of storage batteries D C2 and the other end of electric capacity C7 ~ C8 simultaneously.
DC bus voltage regulation unit, arranges switch (not shown in FIG.) to control the use of storage battery in the connection loop of storage battery, when distribution system does not break down by three-phase series current transforming unit be energy storage device charging, direct-flow storage battery does not come into operation.When distribution system generation single phase ground fault, direct current electric power storage is come into operation as parallel three phase current transforming unit inversion output zero sequence compensation electric current provides DC voltage to support, when distribution system generation power outage, direct-flow storage battery is come into operation and is played the effect of uninterrupted power supply in short-term by the inversion of parallel three phase current transforming unit.
As shown in Figure 4, above-mentioned three-phase series current transforming unit comprises IGBT pipe G1 ' ~ G6 ' and diode D1 ' ~ D6 '.The negative electrode of three-phase series current transforming unit DC side the positive pole simultaneously collector electrode of parallel IGBT pipe G1 ', IGBT pipe G3 ', IGBT pipe G5 ' and diode D1 ', diode D3 ', diode D5 '.The anode of the collector electrode of IGBT pipe G1 ' and diode D1 ' the simultaneously collector electrode of parallel IGBT pipe G2 ', the negative electrode of diode D2 ' and the C phase of three-phase series current transforming unit is held; The anode of the collector electrode of IGBT pipe G3 ' and diode D3 ' the simultaneously collector electrode of parallel IGBT pipe G4 ', the negative electrode of diode D4 ' and the B phase of three-phase series current transforming unit is held; The anode of the collector electrode of IGBT pipe G5 ' and diode D5 ' the simultaneously collector electrode of parallel IGBT pipe G6 ', the negative electrode of diode D6 ' and the C phase of three-phase series current transforming unit is held, the A phase of three-phase series current transforming unit is held, B phase is held and C phase holds the AC forming three-phase series current transforming unit, and AC is connected with above-mentioned series filtering unit.The anode of three-phase series current transforming unit DC side the negative pole simultaneously emitter of parallel IGBT pipe G2 ', IGBT pipe G4 ', IGBT pipe G6 ' and diode D2 ', diode D4 ', diode D6 '.The gate pole of IGBT pipe G1 ' ~ G6 ' is connected with above-mentioned voltage control unit (module U2) simultaneously and realizes controlling, control three-phase series current transforming unit output amplitude and the controlled voltage of phase place by voltage control unit, and inserted in power network line the function realizing voltage-regulation, phase shifting control and power flow and control by series coupled transformer.
As shown in Figure 2, above-mentioned series filtering unit comprises electric capacity C4 ~ C6, inductance L 4 ~ L6.The A phase of above-mentioned three-phase series current transforming unit AC one end after holding series inductance L4 simultaneously in one end of shunt capacitance C4 and transformer T3 in one group of former limit winding N1, the vice-side winding corresponding with this former limit winding is connected in electrical network A cross streams electricity, the other end ground connection of electric capacity C4; The B phase of three-phase series current transforming unit AC one end after holding series inductance L5 simultaneously in one end of shunt capacitance C5 and transformer T3 in one group of former limit winding N1, the vice-side winding corresponding with this former limit winding is connected in electrical network B cross streams electricity, the other end ground connection of electric capacity C5; The C phase of three-phase series current transforming unit AC one end after holding series inductance L6 simultaneously in one end of shunt capacitance C6 and transformer T3 in one group of former limit winding N1, the vice-side winding corresponding with this former limit winding is connected in electrical network C cross streams electricity, the other end ground connection of electric capacity C6.The other end of three groups of former limit windings of above-mentioned transformer T3 is all by K switch 2 ground connection, when K switch 2 is off state, transformer T3 former limit winding is star-like direct grounding way, when K switch 2 is on-state, transformer T3 former limit winding is star-like earth-free mode, and vice-side winding three-phase seals in electrical network.
Specific works process and operation principle as follows:
As shown in Figure 5, voltage control module is by the three-phase voltage of the instrument transformer continuous measurement power distribution network in existing power distribution network and residual voltage, when residual voltage is greater than 15% of phase voltage, judge to there occurs earth fault, and by comparing three-phase voltage size and identifying fault phase, now parallel three phase current transforming unit is operated in inverter mode, the DC inverter that DC bus voltage regulation unit exports is converted to alternating current, and is exported by the first coupling transformer.Now current control unit controls the break-make of switching device in parallel three phase current transforming unit, injects the required zero-sequence current compensated in electrical network.After time delay 5s, reduce the injection of zero-sequence current, and again the residual voltage in electrical network is detected, and judge the whether proportional decline of residual voltage, if proportional decline, represent fault point blow-out, now stop continuing to inject zero-sequence current, recover power distribution network and normally run; If the not long ratio of residual voltage declines, then this fault point is continuous earth fault, carries out failure line selection and isolated fault circuit, makes distribution network restoration normal.
If there is not earth fault in electrical network, then this circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc carries out Real-time Power Flow control to electrical network, now circuital current, the main control chip of voltage control unit and signal processing circuit detect line voltage distribution and current signal, the magnitude of voltage needing to insert to distribution system is calculated according to target power, convertor circuit in parallel is operated in rectification state and charges to DC bus side storage capacitor, voltage control module controls Serial inverting circuit and is operated in inverter mode, magnitude of voltage needed for output realizes power flowcontrol function.
For verifying that above-mentioned realizes the circuit of power flowcontrol and low current grounding active compensation extinguishing arc and the feasibility of method simultaneously, in the SIMULINK of MATLAB, build power distribution network looped network operation with closed ring system and circuit model has carried out simulation analysis.Power flowcontrol simulating, verifying is as follows, and for comparing situation before and after power flowcontrol, circuit comes into operation when 0.15S.
As shown in Figure 6, circuit active power flow condition when curve 1 and curve 2 are respectively same bus two outlet operation with closed ring, before not carrying out power flowcontrol, the outlet conveying active power that curve 1 represents is large, and the outlet conveying active power that curve 1 represents is little.When 0.15S, circuit carries out power flowcontrol to it, and after control, the active power of two outlet conveyings obviously changes, and regulates the active power flowing of two outlets.
As Fig. 7 ~ 8 are depicted as voltage-regulation oscillogram, wherein waveform A, B, C is respectively A, B, C three-phase corresponding voltage oscillogram, as shown in Figure 7, the voltage of system there occurs fluctuation, has a strong impact on the normal work of the various load of load side, after having carried out voltage-regulation, the waveform of A, B, C three-phase as shown in Figure 8, eliminate by line voltage fluctuates, and line voltage distribution recovers normal, line voltage fluctuates is eliminated, and line voltage distribution recovers normal.
As shown in Fig. 9 ~ 10, for this circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc have chance with compensate function checking waveform, as shown in Figure 9, when 0.04S, there is earth fault in A phase, fault waveform as shown in the figure, according to Simulation Model calculation of parameter, determines that the required zero sequence compensation electric current exported of the three-phase of circuit is as zero-sequence current comprehensive of injecting three-phase line.Now can according to combination in any to zero-sequence current comprehensively distributing and respectively inject three-phase line.For comparing compensation context, when 0.15S, circuit comes into operation, and injection zero-sequence current carries out the current in the fault point waveform after active compensation extinguishing arc as shown in Figure 10, and waveform recovers normal after 0.15S.
From above-mentioned simulation result map analysis, the circuit structure that simultaneously can realize power flowcontrol and active compensation extinguishing arc proposed by the invention, the function such as power flowcontrol, voltage-regulation can be carried out when not breaking down, and when generation is single-phase connect fault after can by three of circuit in parallel convertor circuit in opposite directions power distribution network inject zero-sequence current and carry out active compensation extinguishing arc, reduce the harm of single phase ground fault.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection range of technical solution of the present invention.
Claims (10)
1. realize the circuit of power flowcontrol and low current grounding active compensation extinguishing arc simultaneously, it is characterized in that: comprising:
First coupling transformer, three groups of former limit windings are connected in parallel on distribution system A, between B, C three-phase line and earth terminal respectively;
Parallel three phase module, comprises AC and DC side, and its AC is connected with the first coupling transformer vice-side winding respectively, for being realized reactive power compensation and the active compensation extinguishing arc of electrical network by the first coupling transformer;
DC bus voltage regulation unit, one end is connected with the DC side of parallel three phase module, for realizing DC voltage-stabilizing and providing passage for exporting zero sequence compensation electric current;
Three-phase series module, comprises AC and DC side, and its DC side is connected with the other end of DC bus voltage regulation unit, changes trend flowing for inserting voltage by the second coupling transformer to distribution system;
Second coupling transformer, its former limit winding is connected between three-phase series module AC and earth terminal, and vice-side winding is connected in distribution system A, B, C three-phase line respectively.
2. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 1, is characterized in that: described parallel three phase module comprises for the parallel three phase filter unit of filtering high order harmonic component, parallel three phase current transforming unit and the current control unit that controls parallel three phase current transforming unit; The AC of parallel three phase current transforming unit passes through the first coupling transformer described in the connection of parallel filtering unit, the DC bus voltage regulation unit described in DC side connection of parallel three phase current transforming unit.
3. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 1, is characterized in that: described three-phase series module comprises for the series filtering unit of high order harmonic component in filtering three-phase series current transforming unit output voltage, three-phase series current transforming unit and the voltage control unit that controls three-phase series current transforming unit; The AC of three-phase series current transforming unit connects the former limit winding of described second coupling transformer by series filtering unit, the DC bus voltage regulation unit described in DC side connection of three-phase series current transforming unit.
4. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 2, it is characterized in that: described parallel three phase current transforming unit adopts three phase bridge all control circuit, comprise IGBT pipe G1 ~ G6 and diode D1 ~ D6, the collector electrode of parallel IGBT pipe G1, IGBT pipe G3, IGBT pipe G5 while of parallel three phase current transforming unit DC side positive pole, the emitter of parallel IGBT pipe G2, IGBT pipe G4, IGBT pipe G6 while of parallel three phase current transforming unit DC side negative pole; The emitter of IGBT pipe G1, IGBT pipe G3, IGBT pipe G5 connects the collector electrode of IGBT pipe G2, IGBT pipe G4, IGBT pipe G6 respectively and the AC of drawing parallel three phase current transforming unit is respectively connected with parallel filtering unit;
The negative electrode of diode D1 ~ D6 connects the collector electrode of IGBT pipe G1 ~ G6 respectively, and the anode of diode D1 ~ D6 connects the emitter of IGBT pipe G1 ~ G6 respectively, and the gate pole of IGBT pipe G1 ~ G6 is connected with described current control unit simultaneously.
5. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 2, it is characterized in that: described parallel filtering unit adopts the parallel three phase LC second-order filter circuit be made up of electric capacity C1 ~ C3 and inductance L 1 ~ L3, three groups of vice-side winding shunt inductance L1 and electric capacity C1 respectively of the first coupling transformer, one end of inductance L 2 and electric capacity C2 and inductance L 3 and electric capacity C3, the other end ground connection of electric capacity C1 ~ C3, the other end of inductance L 1 ~ L3 connects the AC of parallel three phase current transforming unit respectively.
6. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 3, it is characterized in that: described three-phase series current transforming unit adopts three phase bridge all control circuit, comprise IGBT pipe G1 ' ~ G6 ' and diode D1 ' ~ D6 ', three-phase series current transforming unit DC side positive pole is parallel IGBT pipe G1 ' simultaneously, IGBT pipe G3 ', the collector electrode of IGBT pipe G5 ', three-phase series current transforming unit DC side negative pole is parallel IGBT pipe G2 ' simultaneously, IGBT pipe G4 ', the emitter of IGBT pipe G6 ', IGBT pipe G1 ', IGBT pipe G3 ', the emitter of IGBT pipe G5 ' connects IGBT pipe G2 ' respectively, IGBT pipe G4 ', the collector electrode of IGBT pipe G6 ' the AC of drawing three-phase series current transforming unit are respectively connected with series filtering unit,
The negative electrode parallel IGBT pipe G1 ' ~ G6 ' collector electrode respectively of diode D1 ' ~ D6 ', the emitter of anode difference parallel IGBT pipe the G1 ' ~ G6 ' of diode D1 ' ~ D6 ', IGBT pipe G1 ' ~ G6 ' gate pole is connected with described voltage control unit simultaneously.
7. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 3, it is characterized in that: described series filtering unit comprises the three-phase series LC second-order filter circuit be made up of electric capacity C4 ~ C6 and inductance L 4 ~ L6, one end of difference the second coupling transformer in parallel three groups of former limit windings and one end of electric capacity C4 ~ C6 after the AC difference series inductance L4 ~ L6 of three-phase series current transforming unit, the other end ground connection of electric capacity C4 ~ C6, the other end of the second coupling transformer three groups former limit winding is by K switch 2 ground connection.
8. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 1, it is characterized in that: the two storage battery and the double-energy storage element that support DC bus side voltage when described DC bus voltage regulation unit is included in active compensation extinguishing arc, drawing the direct ground connection of center line in the middle of double-energy storage element, providing passage for exporting zero sequence compensation electric current.
9. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 8, it is characterized in that: described two storage batterys are storage batteries D C1 and DC2, described double-energy storage element is storage capacitor C7 ~ C8;
The positive pole of the positive pole of parallel three phase module the DC side positive pole of multiple-connected battery DC1, one end of electric capacity C7 and the DC side of three-phase series module simultaneously, the negative pole of the negative pole of parallel three phase module the DC side negative pole of multiple-connected battery DC2, one end of electric capacity C8 and the DC side of three-phase series module simultaneously, earth terminal is the negative pole of multiple-connected battery DC1, the positive pole of storage batteries D C2 and the other end of electric capacity C7 ~ C8 simultaneously, draws the direct ground connection of center line between electric capacity C7 and C8.
10. the circuit simultaneously realizing power flowcontrol and low current grounding active compensation extinguishing arc according to claim 1, is characterized in that: the former vice-side winding of the second described coupling transformer adopts star neutral-point solid ground mode.
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| CN111505440A (en) * | 2020-04-27 | 2020-08-07 | 云南拓普特种电源科技有限公司 | Ground fault detection and protection system and method based on class D power amplifier |
| CN114142451B (en) * | 2021-11-19 | 2022-09-23 | 广东福德电子有限公司 | Power distribution network ground fault voltage reduction active arc suppression power supply and control method thereof |
| CN114142451A (en) * | 2021-11-19 | 2022-03-04 | 广东福德电子有限公司 | Power distribution network ground fault voltage reduction active arc suppression power supply and control method thereof |
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