CN104953605A - Interphase unbalance management circuit, system and method for three-phase network - Google Patents
Interphase unbalance management circuit, system and method for three-phase network Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention relates to an interphase unbalance management circuit, system and method for a three-phase network. The interphase unbalance management circuit comprises three line-side inductors (L1, L2 and L3), three inverter inductors (L4, L5 and L6), a three-phase full-wave circuit and capacitor banks (C4 and C5), wherein one ends of the three line-side inductors are respectively connected with the phases A, B and C of the three-phase network, and the other end of the three line-side inductors are respectively connected with the three inverter inductors correspondingly; the other ends of the three inverter inductors are respectively connected with the inverter output sides of the three-phase full-wave circuit; each of the connecting point of the inductor L1 and L4, the connecting point of the inductor L2 and L5, and the connecting point of the inductor L3 and L6 is connected with a filtering circuit, and the other ends of the filtering circuits are connected with a network N wire; the middle point of the two capacitor banks is connected with the network N wire. The invention solves the technical problem that the compensation mode of a passive device cannot realize linear compensation. The interphase unbalance management circuit, system and method can well manage three-phase unbalance and reduce the three-phase unbalance degree.
Description
Technical field
The present invention relates to the improvement of rural power service system power quality, be specifically related to the alternate unbalanced electrical network Standard type device of a kind of improvement three phase network.
Background technology
Network system mostly is low voltage three-phase four-wire system and powers, and network load mostly is the unbalanced and electricity consumption time property of there are differences of single-phase load, power load distributing, and make three-phase load unbalance, N line exists larger electric current, causes network system line loss rate high; Three-phase imbalance causes transformer loss to increase, and heating is serious, and transformer damage is serious, and three-phase imbalance also reduces exerting oneself of transformer simultaneously, has had a strong impact on the fail safe of network system power supply quality and mains supply.
Prior art majority is the reactive power using three-phase power capacitor or the three-phase power capacitor that is made up of three single-phase electricity containers to carry out compensates electric system.China Patent No. is 200510045751.6, name is called: " device of effectively compensating three-phase unbalance load and reactive power " adopts the compensator of delta connection (capacitor or reactor) or the compensating device by same group of Y connection, their are made to realize they to be added in simultaneously and respectively to go up mutually by the single-phase switch controlled by power controller, also can be added between different each phases with each phase or between each phase and zero line, three-phase total compensation can be used as, also can be used as single-phase compensation, also can realize the balance of active power; China Patent No. is 201410330635.8, name is called: " device of a kind of active power balance adjustment and reactive power compensation ", idle Intelligent capacitor of mending altogether divides benefit reactive power compensation Intelligent capacitor with A, B, C phase, regulating Intelligent capacitor Cab, BC line active balance to regulate Intelligent capacitor Cbc, CA line active balance to regulate Intelligent capacitor Cca by arranging AB line active balance, realizing the balance of active power.Prior art also has the three-phase imbalance device adopting active device to form.China Patent No. is 201310224032.5, name is called: " a kind of laod unbalance bucking-out system " adopts DSP+FPGA to control a kind of active type laod unbalance bucking-out system of framework, though be describe method and implementation procedure in detail, but all do not adopt effective ways to administer because HF switch harmonic wave pollutes the electromagnetic interference that electrical network causes in above-mentioned patent, and possibility that is untreated and electrical network generation resonance, cannot apply in grid power system.
Prior art passes through passive device, pass through switch on-off, the mode of combination realizes the balance adjustment of power, but there is the problem that notch cuttype compensates in above method, and overcompensation or undercompensation can be there is, the degree of balance that three-phase is meritorious can only be reduced, cannot linear compensation be realized, three-phase imbalance problem cannot be solved at all; And adopt the mode of switch on-off combination, especially in network system, the fluctuation of load is very frequent, and will cause switch switching work continually, and easily cause the damage of switching device, for network system, maintainability and operability are too poor; Adopt the mode of passive device switching to realize power three-phase imbalance to administer, easily cause and electrical network generation resonance, cause the instability of electrical network; And adopt passive device implementation method, there is volume large, the problem that weight is large, is difficult to install at electrical network Standard type; So existing defects is gone back in active power balance technology application at present, be especially difficult to use at electrical network Standard type.
Summary of the invention
In order to solve adopt the compensation way of passive device cannot realize linear compensation, easily, weight large with electrical network generation resonance, compensation arrangement volume greatly, be difficult to the technical problem of installing at electrical network Standard type, the invention provides the alternate uneven controlling device of a kind of three phase network and method.
To achieve these goals, the present invention adopts following technical scheme:
The alternate imbalance of three phase network administers circuit, comprise three net side inductance, three inversion inductors, three-phase full-wave circuit, electric capacity C4 and electric capacity C5, described three net side inductance comprise inductor L1, inductor L2 and inductor L3, described three inversion inductors comprise inductor L4, inductor L5 and inductor L6, one end of three net side inductance respectively with three phase network A, B, C connects, three net side inductance other ends are corresponding with three inversion inductors respectively to be connected, the other end of three inversion inductors is connected with the inversion outlet side of three-phase full-wave circuit respectively, described electric capacity C4, electric capacity C5 is the Support Capacitor of three-phase full-wave circuit direct side,
Inductor L1 and the tie point of inductor L4 are connected with the resistance R1 and electric capacity C1 that connect, inductor L2 and the tie point of inductor L5 are connected with the resistance R2 and electric capacity C2 that connect, and inductor L3 and the tie point of inductor L6 are connected with the resistance R3 and electric capacity C3 that connect; The other end of described electric capacity C1, electric capacity C2, electric capacity C3 is connected to electrical network N line, and the mid point of electric capacity C4, electric capacity C5 is connected with electrical network N line.
Above-mentioned three-phase full-wave circuit is made up of 3 IGBT module.
The alternate uneven governing system of three phase network, comprises the alternate imbalance of three phase network and administers circuit, detects sampling conditioning unit, control algorithm unit and driver element,
The described sampling conditioning unit that detects is for the output conditioned signal of carrying out nursing one's health from three net side inductance and the three-phase inversion output current at three-phase inversion inductance tie point place, three-phase inversion inductance and the three-phase LCL filtered circuit of three-phase full-wave circuit junction, the threephase load electric current of external load and three-phase power grid voltage of sampling;
Described control algorithm unit comprises soft phase-locked loop control module, extraction module and SPWM modulation module,
Described soft phase-locked loop control module is carried out phase-locked to three-phase power grid voltage, exports synchronizing signal:
Described extraction module: based on a kind of adaptive control law of symmetrical component method, according to synchronizing signal, threephase load electric current is transformed to order components by phase component, the positive sequence component electric current obtaining needing to compensate, the value of negative sequence component electric current and zero-sequence component electric current: after zero-sequence component current operator is obtained fundamental wave zero sequence electric current and harmonic zero sequence current; Positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current the most at last, sends to SPWM modulation module;
Described SPWM modulation module: receive after positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current are added and carry out SPWM modulation, obtain three road pwm signal level;
Described driver element: by three road pwm signal level conversion conditionings, obtain the PWM drive singal of 6 tunnel isolation, control the IGBT module of three-phase full-wave circuit.
Above-mentioned control algorithm unit also comprises protection module, for foundation voltage, electric current and frequency protection equipment.
Above-mentioned control algorithm unit is based on DSP and FPGA.
The alternate uneven administering method of three phase network, its special character is: comprise the following steps:
1) sampling is from three net side inductance and three-phase inversion inductance tie point place LCL filtered circuit, three-phase inversion inductance and the three-phase inversion output current of three-phase full-wave circuit junction, the threephase load electric current of external load and the three-phase power grid voltage output conditioned signal of carrying out nursing one's health;
2) carry out phase-locked to three-phase power grid voltage, export synchronizing signal:
3) according to synchronizing signal, threephase load electric current is transformed to order components by phase component, the positive sequence component electric current obtaining needing to compensate, the value of negative sequence component electric current and zero-sequence component electric current: after zero-sequence component current operator is obtained fundamental wave zero sequence electric current and harmonic zero sequence current; Positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current the most at last;
4) be added after receiving positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current, then carry out SPWM modulation, obtain three road pwm signal level;
5) by three road pwm signal level conversion conditionings, obtain the PWM drive singal of six tunnel isolation, control the IGBT module of three-phase full-wave circuit, adopt closed-loop control system, obtain the electric current needing to export.
Above-mentioned steps 3) based on a kind of adaptive control law of symmetrical component method.
Compared with prior art, advantage is in the present invention:
1, the present invention can administer three-phase imbalance, reduces tri-phase unbalance factor: three-phase four wire system, due to the factor of single-phase load, causes three-phase imbalance, causes transformer loss to increase, transformer undercapacity, and line loss increases.The present invention detects load current by current transformer, on the basis of the zero-sequence current extracted, based on a kind of adaptive control law of symmetrical component method, extract negative-sequence current, positive sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current, the negative phase-sequence instruction needing to compensate is produced by DSP computing, positive sequence instruction, zero sequence instruction, using instruction superposition as given value of current, produce pwm control signal, equipment is made to export corresponding offset current, finally reach the target of administering three-phase imbalance, reduce tri-phase unbalance factor;
2, the present invention's many times of N line currents are administered: three-phase four wire system, due to the factor of single-phase load, causes three-phase imbalance, and N line current is large, causes serious electric energy loss.The present invention detects load current by current transformer, extract zero-sequence current, obtain fundamental wave zero sequence, harmonics zero sequence further, network system neutral line current is mainly above zero sequence composition, and DSP computing produces the zero-sequence current instruction needing to compensate, based on SPWM modulation technique, produce pwm control signal, make equipment export corresponding zero-sequence current, compensate N line current, final elimination N line current, reduces the line loss because N line current causes;
3, energy compensating reactive power of the present invention: network system load mostly is water pump, agricultural motor, need to draw idle from electrical network, cause power factor of electric network low, transformer undercapacity, line loss is large.The present invention detects load current by current transformer, compensating zero sequence, negative phase-sequence, residual capacity compensating reactive power, TTA Current Detection Algorithm, extract idle composition, produce reactive power compensation instruction by DSP computing, produce pwm control signal, make equipment export corresponding reactive current, finally reach compensating reactive power, improve transformer to exert oneself, reduce line loss, improve the object of power factor.
4, the present invention proposes the alternate unbalanced administering method of a kind of three phase network and electrical network Standard type device, load current is detected by current transformer, extract three phase unbalance current, pass through adaptive control algorithm, according to the real time data of load current, carry out Dynamic control, fast response time, can linear compensation, can not with electrical network generation resonance, and weight of equipment is light, capacity is large, be highly suitable for electrical network Standard type to install and use, final realization net side three phases active power balance, tri-phase unbalance factor can reach 0, eliminate N line current simultaneously, reach reduction line loss, improve transformer to exert oneself, equipment residual capacity can compensating reactive power.
Accompanying drawing explanation
Fig. 1 is main circuit structure figure of the present invention;
Fig. 2 is the schematic diagram of the alternate uneven governing system of three phase network of the present invention;
Fig. 3 is the principle schematic that symmetrical component method decomposes negative phase-sequence zero sequence.
Embodiment
As shown in Figure 1, the alternate imbalance of three phase network administers circuit, comprise three net side inductance, three inversion inductors, three-phase full-wave circuit, capacitance group (C4, C5), three net side inductance comprise inductor L1, inductor L2 and inductor L3, three inversion inductors comprise inductor L4, inductor L5 and inductor L6, one end of three net side inductance respectively with three phase network A, B, C connects, three net side inductance other ends are corresponding with three inversion inductors respectively to be connected, the other end of three inverter side inductance is connected with the inversion outlet side of three-phase full-wave circuit respectively, electric capacity C4, electric capacity C5 is the Support Capacitor of three-phase full-wave circuit direct side, also comprise filter circuit, comprise resistance R1 and electric capacity C1, resistance R2 and electric capacity C2 and resistance R3 and electric capacity C3, mainly filtering switch time high-frequency signal.
Inductor L1 and the tie point of inductor L4 are connected with the resistance R1 and electric capacity C1 that connect, inductor L2 and the tie point of inductor L5 are connected with the resistance R2 and electric capacity C2 that connect, and inductor L3 and the tie point of inductor L6 are connected with the resistance R3 and electric capacity C3 that connect; The other end of electric capacity C1, electric capacity C2, electric capacity C3 is connected to electrical network N line, and the mid point of electric capacity C4, electric capacity C5 is connected with electrical network N line.
Wherein three-phase full-wave circuit is made up of 3 IGBT module.
As shown in Figure 2, the alternate uneven governing system of three phase network, comprises the alternate imbalance of three phase network and administers circuit, detects sampling conditioning unit, control algorithm unit and driver element,
Detect sampling conditioning unit for the output conditioned signal of carrying out nursing one's health from three net side inductance and the three-phase inversion output current at three-phase inversion inductance tie point place, three-phase inversion inductance and the three-phase LCL filtered circuit of three-phase full-wave circuit junction, the threephase load electric current of external load and three-phase power grid voltage of sampling;
Control algorithm unit comprises soft phase-locked loop control module, extraction module and SPWM modulation module,
Soft phase-locked loop control module is carried out phase-locked to three-phase power grid voltage, export synchronizing signal: extraction module: based on a kind of adaptive control law of symmetrical component method, according to synchronizing signal, threephase load electric current is transformed to order components by phase component, the positive sequence component electric current obtaining needing to compensate, the value of negative sequence component electric current and zero-sequence component current i 0: after zero-sequence component current operator is obtained fundamental wave zero sequence electric current and harmonic zero sequence current; Positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current the most at last, sends to SPWM modulation module; SPWM modulation module: receive after positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current are added and carry out SPWM modulation, obtain three road pwm signal level; Driver element: by three road pwm signal level conversion conditionings, obtain the PWM drive singal of 6 tunnel isolation, control the IGBT module of three-phase full-wave circuit.
In order to ensure the normal operation of whole Circuits System, control algorithm unit also comprises protection module, for the protection of voltage and current.Control algorithm unit is based on DSP and FPGA.
Native system can reduce tri-phase unbalance factor, compensates fundamental negative sequence current, fundamental wave zero sequence electric current and harmonic zero sequence current, residual capacity compensating reactive power.
Main circuit is three-phase bridge two level voltage source current transformer composition, device for power switching adopts igbt (IGBT) module, DC side energy-storage travelling wave tube adopts electrochemical capacitor, for inverter provides direct voltage support, the output loop of device adopts LCL filtering, main filtering device for power switching high frequency switching noise, equipment is connected with electrical network by reactor, and device can not produce resonance with electrical network.
Because the imbalance of power in power distribution network is superimposed upon in positive sequence component by the negative sequence component in load current and zero-sequence component to cause.Making power-balance to compensate, these unbalanced components will be extracted from total current.First utilize symmetrical component method, the threephase load electric current of measurement be transformed to order components by phase component, obtain the value needing negative sequence component the current i 2 and zero-sequence component current i 0 compensated:
Fundamental wave zero sequence component and harmonic wave zero-sequence component is obtained by gathering the further computing of zero-sequence component electric current calculated, add that negative sequence component is delivered in SPWM modulation module together with positive sequence component, DSP is utilized to carry out SPWM control, generate a series of pwm signal, drive IGBT module through drive circuit, send the offset current of needs, these offset currents are contrary with unsymmetrical current size equidirectional, offset after superposition, thus realize the compensation of unbalanced power.
Whole system has methodological science, rationally, can carry out the compensation of unbalanced power, the advantages such as compensation effect is good to distribution system.
The alternate uneven administering method of three phase network, comprises the following steps:
1) the sampling output conditioned signal of carrying out nursing one's health from three net side inductance and the three-phase inversion output current at three-phase inversion inductance tie point place, three-phase inversion inductance and the three-phase LCL filtered circuit of three-phase full-wave circuit junction, the threephase load electric current of external load and three-phase power grid voltage;
2) carry out phase-locked to three-phase power grid voltage, export synchronizing signal:
Utilize the soft phase-locked loop control module of DSP, carry out phase-locked to line voltage, as control system synchronizing signal, the various impact load of network system is many, line voltage scope range of the fluctuation of voltage is large, and line voltage exists larger phase frequency skew, and this phase-locked loop adds stabilization and phase deviation process for power grid application, adapt to wider mains frequency fluctuation range, can 48Hz ~ 52Hz be reached;
3) according to synchronizing signal, by threephase load current i a, the ib of measurement, ic, be transformed to order components by phase component, obtain the value of positive sequence component current i 1, negative sequence component current i 2 and the zero-sequence component current i 0 needing to compensate, device is according to detecting load current composition, self adaptation determining device offset current:
Fundamental wave zero sequence, harmonic wave zero sequence is obtained by gathering the further computing of the zero-sequence component current i 0 calculated; Three phase unbalance current is decomposed into the most at last: positive sequence, negative phase-sequence, fundamental wave zero sequence, harmonic zero sequence current component, superpose decomposing the current-order obtained in dsp, DSP is utilized to carry out SPWM control, generate a series of pwm signal, amplify through drive circuit signal, drive IGBT module, send the offset current of needs, these offset currents are contrary with unsymmetrical current size equidirectional, offset, thus realize the improvement of three-phase power imbalance after superposition.
4) be added after receiving positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current, then carry out SPWM modulation, obtain three road pwm signal level;
5) by three road pwm signal level conversion conditionings, obtain the PWM drive singal of six tunnel isolation, control the IGBT module of three-phase full-wave circuit, adopt closed-loop control system, obtain the electric current needing to export.
The positive sequence component electric current that the uneven composition of three-phase current is corresponding, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current, current-order is added, again by d, q ordinate transform is to three phase coordinate systems, obtain the current-order of three phase coordinate systems, SPWM modulation is carried out based on DSP, obtain three road pwm signals, the pwm signal level that DSP exports is 3.3V, amplify through signal in outside, obtain+15V, 6 road drive singal of the band dead band isolation of-10V level, 63 groups, tunnel drive singal drive IGBT work, inversion exports and connects electrical network by inductor, adopt closed-loop control system, accurately obtain the electric current needing to export.
Concrete job step is as follows:
Step one: according to network load electric current, analyzes the data message of the unbalanced component (positive sequence component, negative sequence component, zero-sequence component) obtained wherein.
Step 2: need the data message of offset current to deliver in the DSP of equipment by detecting, DSP sends the pwm signal driving IGBT according to instruction, send required electric current, compensate by IGBT.
Step 3: system adopts LCL filter, possess good Electro Magnetic Compatibility: IGBT switch time high-frequency harmonic composition, if do not do corresponding filtering process, HF switch harmonic wave flows into electrical network, to serious electromagnetic interference be caused, and notably can cause the damage of the household electrical appliance of access network system.This device adopts LCL filter, can not only be clean by the filtering of HF switch subharmonic, and can not with electrical network generation resonance, even connect multiple devices in same district, low-frequency harmonics also can not be caused to amplify, generation oscillation risks.
Step 4: Phase Lock Technique
Utilize the soft phase-locked loop control module of DSP, carry out phase-locked to line voltage, as control system synchronizing signal, the various impact load of network system is many, line voltage scope range of the fluctuation of voltage is large, and line voltage exists larger phase frequency skew, and this phase-locked loop adds stabilization and phase deviation process for power grid application, adapt to wider mains frequency fluctuation range, can 48Hz ~ 52Hz be reached;
Step 5: active electric current generation technique:
By detecting load three-phase current ia, ib, ic obtains positive sequence corresponding to the uneven composition of three-phase current respectively, negative phase-sequence, zero sequence instruction current, instruction is added, again by d, q ordinate transform is to three phase coordinate systems, obtain the current-order of three phase coordinate systems, SPWM modulation is carried out based on DSP, obtain three road pwm signals, the pwm signal level that DSP exports is 3.3V, amplify through signal in outside, obtain+15V, 6 road drive singal of the band dead band isolation of-10V level, 63 groups, tunnel drive singal drive IGBT work, inversion exports and connects electrical network by inductor, adopt closed-loop control system, accurately obtain the electric current needing to export.
Equipment is selected the offset current of one or more compound modes in fundamental wave zero sequence electric current, harmonic zero sequence current, negative-sequence current, forward-order current and reactive current, and control the watt level of output, can arrange for different application scenarios and select offset current type.
Claims (7)
1. the alternate imbalance of three phase network administers circuit, it is characterized in that: comprise three net side inductance, three inversion inductors, three-phase full-wave circuit, electric capacity C4 and electric capacity C5, described three net side inductance comprise inductor L1, inductor L2 and inductor L3, described three inversion inductors comprise inductor L4, inductor L5 and inductor L6, one end of three net side inductance respectively with three phase network A, B, C connects, three net side inductance other ends are corresponding with three inversion inductors respectively to be connected, the other end of three inversion inductors is connected with the inversion outlet side of three-phase full-wave circuit respectively, described electric capacity C4, electric capacity C5 is the Support Capacitor of three-phase full-wave circuit direct side,
Inductor L1 and the tie point of inductor L4 are connected with the resistance R1 and electric capacity C1 that connect, inductor L2 and the tie point of inductor L5 are connected with the resistance R2 and electric capacity C2 that connect, and inductor L3 and the tie point of inductor L6 are connected with the resistance R3 and electric capacity C3 that connect; The other end of described electric capacity C1, electric capacity C2, electric capacity C3 is connected to electrical network N line, and the mid point of electric capacity C4, electric capacity C5 is connected with electrical network N line.
2. the alternate imbalance of three phase network according to claim 1 administers circuit, it is characterized in that: described three-phase full-wave circuit is made up of 3 IGBT module.
3. the alternate uneven governing system of three phase network, is characterized in that: comprise the alternate imbalance of three phase network and administer circuit, detect sampling conditioning unit, control algorithm unit and driver element,
The described sampling conditioning unit that detects is for the output conditioned signal of carrying out nursing one's health from three net side inductance and the three-phase inversion output current at three-phase inversion inductance tie point place, three-phase inversion inductance and the three-phase LCL filtered circuit of three-phase full-wave circuit junction, the threephase load electric current of external load and three-phase power grid voltage of sampling;
Described control algorithm unit comprises soft phase-locked loop control module, extraction module and SPWM modulation module,
Described soft phase-locked loop control module is carried out phase-locked to three-phase power grid voltage, exports synchronizing signal:
Described extraction module: based on a kind of adaptive control law of symmetrical component method, according to synchronizing signal, threephase load electric current is transformed to order components by phase component, the positive sequence component electric current obtaining needing to compensate, the value of negative sequence component electric current and zero-sequence component electric current: after zero-sequence component current operator is obtained fundamental wave zero sequence electric current and harmonic zero sequence current; Positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current the most at last, sends to SPWM modulation module;
Described SPWM modulation module: receive after positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current are added and carry out SPWM modulation, obtain three road pwm signal level;
Described driver element: by three road pwm signal level conversion conditionings, obtain the PWM drive singal of 6 tunnel isolation, control the IGBT module of three-phase full-wave circuit.
4. the alternate uneven governing system of three phase network according to claim 3, is characterized in that: described control algorithm unit also comprises protection module, for foundation voltage, electric current and frequency protection equipment.
5. the alternate uneven governing system of the three phase network according to claim 3 or 4, is characterized in that: described control algorithm unit is based on DSP and FPGA.
6. the alternate uneven administering method of three phase network, is characterized in that: comprise the following steps:
1) sampling is from three net side inductance and three-phase inversion inductance tie point place LCL filtered circuit, three-phase inversion inductance and the three-phase inversion output current of three-phase full-wave circuit junction, the threephase load electric current of external load and the three-phase power grid voltage output conditioned signal of carrying out nursing one's health;
2) carry out phase-locked to three-phase power grid voltage, export synchronizing signal:
3) according to synchronizing signal, threephase load electric current is transformed to order components by phase component, the positive sequence component electric current obtaining needing to compensate, the value of negative sequence component electric current and zero-sequence component electric current: after zero-sequence component current operator is obtained fundamental wave zero sequence electric current and harmonic zero sequence current; Positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current the most at last;
4) be added after receiving positive sequence component electric current, negative sequence component electric current, fundamental wave zero sequence electric current and harmonic zero sequence current, then carry out SPWM modulation, obtain three road pwm signal level;
5) by three road pwm signal level conversion conditionings, obtain the PWM drive singal of six tunnel isolation, control the IGBT module of three-phase full-wave circuit, adopt closed-loop control system, obtain the electric current needing to export.
7. the alternate uneven administering method of three phase network according to claim 1, is characterized in that: described step 3) based on a kind of adaptive control law of symmetrical component method.
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Cited By (13)
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| CN105720593A (en) * | 2016-01-04 | 2016-06-29 | 东莞市宝英机电有限公司 | Novel three-phase induction type voltage balance voltage stabilizer |
| CN106026143A (en) * | 2016-08-01 | 2016-10-12 | 山东锦华电力设备有限公司 | Three-phase power balance device based on FPGA control and control system |
| CN106253312A (en) * | 2016-08-05 | 2016-12-21 | 杭州得诚电力科技股份有限公司 | A kind of three-phase imbalance intelligent compensation apparatus |
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| CN106253312A (en) * | 2016-08-05 | 2016-12-21 | 杭州得诚电力科技股份有限公司 | A kind of three-phase imbalance intelligent compensation apparatus |
| CN107748300A (en) * | 2017-09-27 | 2018-03-02 | 西安索普电气技术有限公司 | A kind of tri-phase unbalance factor detection method based on improvement S-transformation |
| CN109301846A (en) * | 2018-02-10 | 2019-02-01 | 新乡市中宝电气有限公司 | Uneven low-voltage controlling device and method |
| CN108879736A (en) * | 2018-06-08 | 2018-11-23 | 浙江涌原新能科技股份有限公司 | A kind of dynamic equilibrium three-phase installation |
| CN109510223A (en) * | 2018-12-14 | 2019-03-22 | 山东鲁能智能技术有限公司 | A kind of three-phase current unbalance administers controller, device and control method |
| CN109494770A (en) * | 2018-12-29 | 2019-03-19 | 国网北京市电力公司 | A kind of three-phase load unbalance intelligent regulating device and method |
| CN109546557A (en) * | 2019-01-15 | 2019-03-29 | 恒电气集团有限公司 | Power Quality Comprehensive Treatment Device |
| CN110022081A (en) * | 2019-04-26 | 2019-07-16 | 国网福建省电力有限公司南平供电公司 | A kind of distributed inverter and its dq transformation Static Decoupling Control method with route selection function |
| CN111464050A (en) * | 2020-04-28 | 2020-07-28 | 深圳供电局有限公司 | AC/DC converter control method, device, AC/DC converter equipment and storage medium |
| CN111464050B (en) * | 2020-04-28 | 2021-08-27 | 深圳供电局有限公司 | AC/DC converter control method, device, AC/DC converter equipment and storage medium |
| CN114256860A (en) * | 2021-11-19 | 2022-03-29 | 苏州爱科赛博电源技术有限责任公司 | Topological structure applied to three-phase unbalance treatment of distribution network and control method |
| CN114256860B (en) * | 2021-11-19 | 2023-11-10 | 苏州爱科赛博电源技术有限责任公司 | Topological structure applied to three-phase imbalance management of distribution network and control method |
| CN117074778A (en) * | 2023-10-16 | 2023-11-17 | 南方电网科学研究院有限责任公司 | Harmonic extraction method and device based on load scene and computer equipment |
| CN117074778B (en) * | 2023-10-16 | 2024-01-19 | 南方电网科学研究院有限责任公司 | Harmonic extraction method and device based on load scene and computer equipment |
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