CN105119262A - Circuit capable of simultaneously adjusting the quality of electric energy and performing active arc extinguishing on a low-current ground fault - Google Patents
Circuit capable of simultaneously adjusting the quality of electric energy and performing active arc extinguishing on a low-current ground fault Download PDFInfo
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Abstract
Provided is a circuit capable of simultaneously adjusting the quality of electric energy and performing active arc extinguishing on a low-current ground fault. The circuit is characterized by including: a three-phase series module and a first coupling transformer, which are used for keeping voltages of a DC bus steady and inserting voltages into a distribution system line to solve the problem of voltage fluctuation of a power grid; a three-phase parallel module and a second coupling transformer, wherein currents are injected to a distribution system through the second coupling transformer during adjustment of the quality of electric energy to eliminate harmonic wave components of load currents in the line, and zero sequence compensation currents are injected to the distribution system during active compensation arc extinguishing; and a DC bus voltage stabilization unit, which connects the three-phase series module with the three-phase parallel module, and is used for providing steady DC voltages to the DC side of the three-phase series module and the three-phase parallel module. The circuit is capable of simultaneously adjusting the quality of electric energy and performing active arc extinguishing on a low-current ground fault. Through adoption of the three-phase series module, the three-phase parallel module and the DC bus voltage stabilization unit, the functions of simultaneously adjusting the quality of electric energy and performing active compensation on a low-current ground fault are achieved.
Description
Technical field
Realize the circuit of quality of power supply adjustment and the active extinguishing arc of low current grounding simultaneously, belong to intermediate distribution system technical field.
Background technology
Along with the development of modern science and technology, the power quality problems such as causing voltage and current wave distortion that comes into operation of numerous nonlinear-load, the continuous increase of sensitive load is had higher requirement to power supply quality and power supply reliability; Meanwhile often there is earth fault in distribution system, network system power outage etc. may be caused to cause economic loss, in earth fault, the fault of about 70% is transient single-phase earth fault, when the electric current of fault point is larger, electric arc is difficult to self-extinguish, easily produces fault overvoltage, cause multiple accident, transformer and switch cubicle may be caused to burn, large area blackout, cause great economic loss.
Along with the attention to power quality problem, the device improving the quality of power supply is also on the increase, and at present, mainly comprises passive LC filter, static var compensators etc.Along with the development of modern power electronics technology and the proposition of instantaneous reactive power theory, APF (Active Power Filter-APF) becomes the most promising means of filtering, and Active Power Filter-APF can be divided into Series FPB and parallel FPB Active Power Filter-APF by the connected mode with electrical network.Within 1996, Japanese scholars Akagi proposes the concept of UPQC (Research on Unified Power Quality Conditioner) first.Series and parallel connections Active Power Filter-APF is linked together by common DC bus by UPQC, can solve load harmonic current and distribution network voltage and to rise sharply the power quality problems such as rapid drawdown, several quality of power supply function can be made simultaneously to improve.
Extinguishing arc technology for small area analysis single phase ground fault comprises passive and active extinguishing arc technology, and all kinds of arc suppression coils of application at present all belong to passive extinguishing arc technology.Along with a large amount of uses of power distribution network capacity expansion, power electronic equipment, idle, meritorious and harmonic component in earth current all increases, simple passive extinguishing arc technology is difficult to fault point to compensate to zero, therefore active extinguishing arc technology is suggested and applies, active extinguishing arc refer to by active convertor circuit to power distribution network inject needed for zero-sequence current by Single-phase Ground Connection Failure current compensation to zero, no longer restrike after guaranteeing arc extinction.
For the quality of power supply and single phase ground fault problem, do not have a kind of device can solve this two problems at present simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, there is provided a kind of by three-phase series module, parallel three phase module and DC bus voltage regulation unit, the circuit that the quality of power supply regulates and realizes quality of power supply adjustment and the active extinguishing arc of low current grounding while the active extinguishing arc of low current grounding can be realized simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: this realizes the circuit of quality of power supply adjustment and the active extinguishing arc of low current grounding simultaneously, comprises A, B, C three-phase line of intermediate distribution system, it is characterized in that: comprising:
First coupling transformer, three groups of vice-side winding are connected in distribution system A, B, C three-phase line respectively;
Three-phase series module, comprise AC and DC side, its AC is connected with the first coupling transformer former limit winding respectively, solves power distribution system voltage fluctuation problem for giving the storage capacitor charging of DC bus voltage regulation unit and inserting voltage by the first coupling transformer to distribution system;
DC bus voltage regulation unit, one end is connected with the DC side of three-phase series module, for realizing DC voltage-stabilizing, providing passage, supporting DC bus side voltage simultaneously when active compensation extinguishing arc for exporting zero sequence compensation electric current;
Parallel three phase module, comprises DC side and AC, and its DC side is connected with the other end of DC bus voltage regulation unit, for realizing compensation and the active compensation arc eliminator of load current harmonic component to distribution system Injection Current;
Second coupling transformer, its former limit winding switching is between Parallel Control module AC and earth terminal, and vice-side winding is connected in parallel between A, B, C three-phase line of distribution system and earth terminal.
Preferably, described three-phase series module comprises for the series filtering unit of high order harmonic component in filtering 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 passes through the first coupling transformer described in the connection of 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 module comprises for the parallel filtering unit of high order harmonic component in filtering output current, 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 connects the former limit winding of described second coupling transformer by parallel filtering unit, the DC bus voltage regulation unit described in AC connection of parallel three phase current transforming unit.
Preferably, described three-phase series current transforming unit adopts the three phase bridge all control circuit be made up of IGBT pipe G1 ~ G6 and diode D1 ~ D6, the collector electrode of parallel IGBT pipe G1, IGBT pipe G3, IGBT pipe G5 while of three-phase series current transforming unit DC side positive pole, the emitter of parallel IGBT pipe G2, IGBT pipe G4, IGBT pipe G6 while of three-phase series 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 three-phase series current transforming unit is respectively connected with series 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 voltage control unit simultaneously.
Preferably, described series 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, one end shunt inductance L1 and electric capacity C1 respectively of three groups of vice-side winding 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, and the other end of three groups of vice-side winding is by K switch 1 ground connection.
Preferably, the three phase bridge all control circuit that described parallel three phase current transforming unit adopts IGBT pipe G1 ' ~ G6 ' and diode D1 ' ~ D6 ' to form, parallel three phase current transforming unit DC side positive pole is parallel IGBT pipe G1 ' simultaneously, IGBT pipe G3 ', the collector electrode of IGBT pipe G5 ', parallel three phase 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 parallel three phase current transforming unit are respectively connected with parallel 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 current control unit simultaneously.
Preferably, the parallel three phase LC second-order filter circuit that described parallel filtering unit adopts inductance L 4 ~ L6 and electric capacity C4 ~ C6 to form, one end of difference shunt capacitance C4 ~ C6 and one end of the second coupling transformer three groups of former limit windings after the AC difference series inductance L4 ~ L6 of parallel three phase current transforming unit, the other end of electric capacity C4 ~ C6 and the other end ground connection of the second coupling transformer three groups of former limit windings; Second coupling transformer three groups vice-side winding is connected in parallel between A, B, C three-phase line and earth terminal respectively.
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 three-phase series module the DC side positive pole of multiple-connected battery DC1, one end of electric capacity C7 and the DC side of parallel three phase module simultaneously, the negative pole of the negative pole of three-phase series module the DC side negative pole of multiple-connected battery DC2, one end of electric capacity C8 and the DC side of parallel three phase 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, the circuit simultaneously realizing quality of power supply adjustment and the active extinguishing arc of low current grounding of the present invention, by three-phase series module, parallel three phase module and DC bus voltage regulation unit, the function of quality of power supply adjustment and the active extinguishing arc of low current grounding can be realized simultaneously.When electrical network does not break down, can solve voltage swells rapid drawdown by three-phase series module, parallel three phase module can solve the power quality problems such as load harmonic current pollution; When there is single phase ground fault, by the capacitor charging that three-phase series module is DC bus voltage regulation unit, zero sequence compensation electric current needed for can being injected to electrical network by parallel three phase module, and determine whether transient earthing fault, the self-healing in time of transient fault energy, if permanent fault, carries out isolation maintenance.
2, three-phase series current transforming unit adopts three phase bridge all control circuit, there is higher switching frequency, rectification state and inverter mode can be operated in, three-phase series current transforming unit keeps the stable of DC bus-bar voltage when being operated in rectification state, when being operated in inverter mode, insert voltage by the first coupling transformer to electrical network, rising sharply when rapid drawdown etc. is fluctuated at distribution network voltage keeps the normal of distribution network voltage.
3, parallel three phase current transforming unit adopts three phase bridge all control circuit, has higher switching frequency.When electrical network does not break down, export the load harmonic current eliminated with the electric current of amplitude antiphase with load harmonic current in distribution line, the harmonic pollution problems that solution nonlinear load etc. causes.Inject zero-sequence current by the second coupling transformer to power distribution network when there is single phase ground fault in electrical network and active compensation is carried out to fault point, no longer restrike after guaranteeing arc extinction.
4, the series filtering unit in three-phase series module, for the high order harmonic component in filtering three-phase series current transforming unit output voltage.
5, the parallel filtering unit in parallel three phase module, filtering parallel three phase current transforming unit export harmonic compensation and earth point offset current in high order harmonic component.
6, the withstand voltage of switching device can be reduced by the first coupling transformer and the second coupling transformer, three-phase string parallel three phase current transforming unit and electrical network are isolated, improve system safety stability.
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 quality of power supply adjustment and the active extinguishing arc of low current grounding.
Fig. 2 is the circuit theory diagrams simultaneously realizing quality of power supply adjustment and the active extinguishing arc of low current grounding.
Fig. 3 is the circuit three-phase series current transforming unit structure chart simultaneously realizing quality of power supply adjustment and the active extinguishing arc of low current grounding.
Fig. 4 is the circuit parallel three phase convertor circuit structure chart simultaneously realizing quality of power supply adjustment and the active extinguishing arc of low current grounding.
Fig. 5 is the circuit working principle flow chart simultaneously realizing quality of power supply adjustment and the active extinguishing arc of low current grounding.
Fig. 6 is load-side three-phase line oscillogram when there is not earth fault.
Fig. 7 is input compensation harmonic current back loading side three-phase line oscillogram.
Fig. 8 is system voltage generation rapid drawdown bus bar side three-phase voltage oscillogram during generation earth fault.
Fig. 9 carries out bus bar side three-phase voltage oscillogram after voltage compensation in Fig. 8.
Figure 10 is that single phase ground fault current in the fault point oscillogram occurs A phase.
Figure 11 injects current in the fault point oscillogram after zero sequence current compensation in Figure 10.
Embodiment
Fig. 1 ~ 11 are most preferred embodiments of the present invention, and below in conjunction with accompanying drawing 1 ~ 11, the present invention will be further described.
As shown in Figure 1, realize the circuit of quality of power supply adjustment and low current grounding active compensation extinguishing arc simultaneously, comprise the first coupling transformer, series filtering unit, three-phase series current transforming unit, DC bus voltage regulation unit, parallel three phase current transforming unit, parallel filtering unit, the second coupling transformer, current control unit and voltage control unit.The vice-side winding of the first coupling transformer is connected with A, B, C three-phase line of intermediate distribution system (following distribution system all refers to intermediate distribution system) respectively.One end of the former limit winding switching series filtering unit of the first coupling transformer, the other end of series filtering unit connects the AC of three-phase series current transforming unit, the DC side of three-phase series 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 parallel three phase current transforming unit, the AC of parallel filtering 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.
Three-phase series current transforming unit is three phase bridge all control circuit, and switching device adopts IGBT and the antiparallel mode of diode to realize, and has higher switching frequency.Three-phase series current transforming unit keeps the stable of DC bus-bar voltage when being operated in rectification state, when being operated in inverter mode, inserts voltage by series coupled transformer to electrical network, and rising sharply when rapid drawdown etc. is fluctuated at distribution network voltage keeps the normal of distribution network voltage.
The drive singal of each switching device of three-phase series current transforming unit is given by voltage control unit, voltage control unit realizes by the IGBT control circuit of routine, 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 algorithm refer to when voltage in electrical network rise sharply or the problem such as rapid drawdown time, the output voltage of voltage control determination circuit produces corresponding pwm signal, and distribution network voltage compensates to normal value by the 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 first coupling transformer former limit winding switching, the use of the first coupling transformer can reduce the withstand voltage of switching device and three-phase series current transforming unit and power network line be isolated, the former limit winding of the first coupling transformer can adopt the direct ground connection of star or earth-free mode, the three-phase of the vice-side winding of the first coupling transformer seals in electrical network respectively, is connected on respectively in 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, guarantees the Stability and veracity of three-phase series current transforming unit rectifier output voltage.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; The capacitance terminal of DC bus voltage stabilizing circuit is connected with the DC side of parallel three phase current transforming unit.
Parallel three phase current transforming unit adopts three phase bridge all control circuit, wherein switching device adopt IGBT and with diode inverse parallel, there is higher switching frequency.Electrical network do not break down and just the quality of power supply existing problems time export the load harmonic current eliminated with the electric current of amplitude antiphase with load harmonic current in distribution line, the harmonic pollution problems that solution nonlinear load etc. causes.Inject zero-sequence current by the second coupling transformer to power distribution network when there is single phase ground fault in electrical network and active compensation is carried out to fault point, no longer restrike after guaranteeing arc extinction.Second coupling transformer secondary is directly connected with distribution line, the use of parallel coupled 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, provides passage for exporting zero-sequence current.
In parallel three phase current transforming unit, the gate electrode drive signals of each switching device is given by current control unit, current control unit realizes by the IGBT control circuit of routine equally, Current Detection Algorithm and current Control Algorithm is provided with in main control chip within it, the phase place of required output current and amplitude when wherein Current Detection Algorithm refers on the one hand main control chip in it by determining that the quality of power supply regulates to the detection of power distribution network secondary side current and calculating, refer to that on the other hand main control chip in it is by determining amplitude and the phase place of the earth current of the needs compensation when there is single phase ground fault to the detection of power distribution network secondary side current, current Control Algorithm refers to that main control chip produces corresponding pwm signal driving switch device gate pole according to echo signal, exports the required set-point compensated.
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 three terminals of parallel three phase current transforming unit AC, filtering parallel three phase current transforming unit export harmonic compensation and earth point offset current in high order harmonic component.The former limit winding switching of the other end and the second coupling transformer, the vice-side winding of the second coupling transformer is directly connected with electrical network.Second coupling transformer can reduce the withstand voltage of three-phase series current transforming unit breaker in middle device, and three-phase series current transforming unit and electrical network are isolated, and improves system safety stability.
As shown in Figure 2, transformer T2 is the first above-mentioned coupling transformer, and three groups of vice-side winding N2 of transformer T2 are connected in electrical network A, B, C three-phase respectively, and three groups of corresponding former limit winding N1 of transformer T2 access in above-mentioned series filtering unit.Reduced the withstand voltage of three-phase series current transforming unit breaker in middle device by transformer T2, three-phase series current transforming unit and electrical network are isolated, improve system safety stability.
Series filtering unit comprises inductance L 1 ~ L2, electric capacity C1 ~ C3, one end of shunt capacitance C1 and inductance L 1 while of access one end of former limit winding corresponding to the vice-side winding of A cross streams electricity in transformer T2 with series connection, the other end ground connection of electric capacity C1; One end of shunt capacitance C2 and inductance L 2 while of access one end of former limit winding corresponding to the vice-side winding of B cross streams electricity in transformer T2 with series connection, the other end ground connection of electric capacity C2; One end of shunt capacitance C3 and inductance L 3 while of access one end of former limit winding corresponding to the vice-side winding of C cross streams electricity in transformer T2 with series connection, the other end ground connection of electric capacity C3.The other end of above-mentioned three groups of former limit winding N1 is simultaneously by K switch 1 ground connection, and when K switch 1 is off state, be the earth-free mode of star, when K switch 1 is closure state, be star direct grounding way, vice-side winding three-phase seals in electrical network.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, three-phase series current transforming unit comprises IGBT pipe G1 ~ G6, diode D1 ~ D6, and the AC of three-phase series current transforming unit is A, B, C three-phase line 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 three-phase series filter 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 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 current control unit (module U1) simultaneously and realizes controlling.Three-phase series current transforming unit keeps the stable of DC bus-bar voltage when being operated in rectification state, when being operated in inverter mode, inserts voltage by series coupled transformer to electrical network, and rising sharply when rapid drawdown etc. is fluctuated at distribution network voltage keeps the normal of distribution network voltage.
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 three-phase series connection 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 parallel three phase current transforming unit DC side simultaneously, the negative pole wearing connection 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 parallel three phase current transforming unit DC side 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 C7 and C8.
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 parallel three phase current transforming unit comprises IGBT pipe G1 ' ~ G6 ' and diode D1 ' ~ D6 '.The negative electrode of parallel three phase 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 parallel three phase 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 parallel three phase current transforming unit is held, the A phase of parallel three phase current transforming unit is held, B phase is held and C phase holds the AC forming parallel three phase current transforming unit, and AC is connected with above-mentioned parallel filtering unit.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 voltage control unit (module U2) simultaneously and realizes controlling, do not broken down by voltage control electrical network and just the quality of power supply existing problems time export the load harmonic current eliminated with the electric current of amplitude antiphase with load harmonic current in distribution line, the harmonic pollution problems that solution nonlinear load etc. causes.
As shown in Figure 2, above-mentioned parallel filtering unit comprises electric capacity C4 ~ C6, inductance L 4 ~ L6.The A phase of parallel three phase 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, this former other end of limit winding N1 and other end ground connection of electric capacity C4, the vice-side winding corresponding with this former limit winding is connected in parallel between A cross streams electricity and earth terminal; The B phase of parallel three phase 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, this former other end of limit winding N1 and other end ground connection of electric capacity C5, the vice-side winding corresponding with this former limit winding is connected in parallel between B cross streams electricity and earth terminal; The C phase of parallel three phase 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, this former other end of limit winding N1 and other end ground connection of electric capacity C6, the vice-side winding corresponding with this former limit winding is connected in parallel between C cross streams electricity and earth terminal.
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.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 the circuit of the quality of power supply adjustment of this while and low current grounding active compensation extinguishing arc carries out real-time quality of power supply adjustment to electrical network.The main control chip of circuit and signal processing circuit detect load side electric current and line voltage distribution, current control module controls the current harmonics in the convertor circuit work output in parallel current compensation distribution line contrary with load current harmonic components amplitude same phase, when detecting that fluctuation occurs voltage, voltage control module controls series connection convertor circuit and inserts magnitude of voltage to distribution line, solve voltage fluctuation problem, the quality of power supply of distribution system is effectively controlled.
For verifying that above-mentioned realizes the quality of power supply and regulate and the circuit of 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.The checking of compensation harmonic functional simulation is as follows, and threephase load adopts the nonlinear load of three-phase uncontrollable rectifier bridge, and when there is not earth fault, load side three-phase current waveform as shown in Figure 6.As shown in Figure 6, in load current, comprise a large amount of harmonic componentss, can main line be had a strong impact on.For contrast does not become front and back effect, when 0.65S, circuit comes into operation, and compensates harmonic current, and as shown in Figure 7, from figure, after compensating, main line electric current is sinusoidal to main line A, B, C three-phase current waveform after compensation substantially, and harmonic pollution is controlled.
Voltage collapse functional simulation figure is as shown in Fig. 8 ~ 9.In the three-phase line waveform shown in Fig. 8, be that earth fault is not occurring equally, system voltage there occurs voltage collapse, therefore can have a strong impact on the normal work of the various load of load side.After circuit drops into, its waveform as shown in Figure 9, can prove when there is not earth fault through emulation, the quality of power supply regulatory functions such as circuit can complete harmonic current compensation, the slump voltage that rises sharply compensation.
Active compensation arc eliminator simulating, verifying is as follows, and when 0.45S, single phase ground fault occurs A phase, and current in the fault point waveform as shown in Figure 10, according to Simulation Model calculation of parameter, is determined the zero sequence compensation electric current of the required output of the three-phase of circuit and is:
, existing according to the output carrying out three-phase electricity flow valuve as follows:
For comparing compensation context, when 0.1S, circuit comes into operation, and injects the current in the fault point waveform after zero-sequence current as shown in figure 11.
From above-mentioned simulation result map analysis, originally can realize the circuit of quality of power supply adjustment and active compensation extinguishing arc simultaneously, quality of power supply regulatory function 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 quality of power supply adjustment and the active extinguishing arc of low current grounding simultaneously, comprise A, B, C three-phase line of intermediate distribution system, it is characterized in that: comprising:
First coupling transformer, three groups of vice-side winding are connected in distribution system A, B, C three-phase line respectively;
Three-phase series module, comprise AC and DC side, its AC is connected with the first coupling transformer former limit winding respectively, solves power distribution system voltage fluctuation problem for giving the storage capacitor charging of DC bus voltage regulation unit and inserting voltage by the first coupling transformer to distribution system;
DC bus voltage regulation unit, one end is connected with the DC side of three-phase series module, for realizing DC voltage-stabilizing, providing passage, supporting DC bus side voltage simultaneously when active compensation extinguishing arc for exporting zero sequence compensation electric current;
Parallel three phase module, comprises DC side and AC, and its DC side is connected with the other end of DC bus voltage regulation unit, for realizing compensation and the active compensation arc eliminator of load current harmonic component to distribution system Injection Current;
Second coupling transformer, its former limit winding switching is between Parallel Control module AC and earth terminal, and vice-side winding is connected in parallel between A, B, C three-phase line of distribution system and earth terminal.
2. the quality of power supply that can simultaneously realize according to claim 1 regulates and the circuit of the active extinguishing arc of low current grounding, it is characterized in that: described three-phase series module comprises for the series filtering unit of high order harmonic component in filtering 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 passes through the first coupling transformer described in the connection of series filtering unit, the DC bus voltage regulation unit described in DC side connection of three-phase series current transforming unit.
3. the quality of power supply that can simultaneously realize according to claim 1 regulates and the circuit of the active extinguishing arc of low current grounding, it is characterized in that: described parallel three phase module comprises for the parallel filtering unit of high order harmonic component in filtering output current, 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 connects the former limit winding of described second coupling transformer by parallel filtering unit, the DC bus voltage regulation unit described in AC connection of parallel three phase current transforming unit.
4. the circuit that simultaneously can realize quality of power supply adjustment and the active extinguishing arc of low current grounding according to claim 2, it is characterized in that: described three-phase series current transforming unit adopts the three phase bridge all control circuit be made up of IGBT pipe G1 ~ G6 and diode D1 ~ D6, the collector electrode of parallel IGBT pipe G1, IGBT pipe G3, IGBT pipe G5 while of three-phase series current transforming unit DC side positive pole, the emitter of parallel IGBT pipe G2, IGBT pipe G4, IGBT pipe G6 while of three-phase series 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 three-phase series current transforming unit is respectively connected with series 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 voltage control unit simultaneously.
5. the circuit that simultaneously can realize quality of power supply adjustment and the active extinguishing arc of low current grounding according to claim 2, it is characterized in that: described series 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, one end shunt inductance L1 and electric capacity C1 respectively of three groups of vice-side winding 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, the other end of three groups of vice-side winding is by K switch 1 ground connection.
6. the circuit that simultaneously can realize quality of power supply adjustment and the active extinguishing arc of low current grounding according to claim 3, it is characterized in that: the three phase bridge all control circuit that described parallel three phase current transforming unit adopts IGBT pipe G1 ' ~ G6 ' and diode D1 ' ~ D6 ' to form, parallel three phase current transforming unit DC side positive pole is parallel IGBT pipe G1 ' simultaneously, IGBT pipe G3 ', the collector electrode of IGBT pipe G5 ', parallel three phase 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 parallel three phase current transforming unit are respectively connected with parallel 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 current control unit simultaneously.
7. the circuit that simultaneously can realize quality of power supply adjustment and the active extinguishing arc of low current grounding according to claim 3, it is characterized in that: the parallel three phase LC second-order filter circuit that described parallel filtering unit adopts inductance L 4 ~ L6 and electric capacity C4 ~ C6 to form, one end of difference shunt capacitance C4 ~ C6 and one end of the second coupling transformer three groups of former limit windings after the AC difference series inductance L4 ~ L6 of parallel three phase current transforming unit, the other end of electric capacity C4 ~ C6 and the other end ground connection of the second coupling transformer three groups of former limit windings; Second coupling transformer three groups vice-side winding is connected in parallel between A, B, C three-phase line and earth terminal respectively.
8. the circuit that simultaneously can realize quality of power supply adjustment and the active extinguishing arc of low current grounding 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 that simultaneously can realize quality of power supply adjustment and the active extinguishing arc of low current grounding 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 three-phase series module the DC side positive pole of multiple-connected battery DC1, one end of electric capacity C7 and the DC side of parallel three phase module simultaneously, the negative pole of the negative pole of three-phase series module the DC side negative pole of multiple-connected battery DC2, one end of electric capacity C8 and the DC side of parallel three phase 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 that simultaneously can realize quality of power supply adjustment and the active extinguishing arc of low current grounding according to claim 1, is characterized in that: the former vice-side winding of the second described coupling transformer adopts star neutral point directly to connect mode.
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| CN108333474A (en) * | 2018-01-25 | 2018-07-27 | 清华大学 | A kind of the delay method of discrimination and system of the fault direction of bus circuit |
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| CN110011280A (en) * | 2019-04-18 | 2019-07-12 | 国网江苏省电力有限公司 | A kind of series connection unsteady flow module and electric power electric transformer with Fault Isolation function |
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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 |
| US11735923B2 (en) | 2020-07-28 | 2023-08-22 | Eaton Intelligent Power Limited | Voltage regulation device that includes a converter for harmonic current compensation and reactive power management |
| CN114256827A (en) * | 2021-12-17 | 2022-03-29 | 华中科技大学 | Arc extinction method for network-source direct connection system of marine nuclear power platform |
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