CN110212556A - Three-phase imbalance and idle improvement automatic switching device and method - Google Patents
Three-phase imbalance and idle improvement automatic switching device and method Download PDFInfo
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- CN110212556A CN110212556A CN201910212497.6A CN201910212497A CN110212556A CN 110212556 A CN110212556 A CN 110212556A CN 201910212497 A CN201910212497 A CN 201910212497A CN 110212556 A CN110212556 A CN 110212556A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A kind of three-phase imbalance and idle improvement automatic switching device, main circuit include Switching Power Supply, voltage collecting device, current collecting device, contactor, breaker, intelligent capacitor group, power electronic equipment；Intelligent capacitor group includes alternate compensating electric capacity and phase ground compensating electric capacity, and including the multiple groups capacitance adjustment branch being connected between three-phase between phase ground, each road is connected with combination switch, is connected with contactor between intelligent capacitor group and bus；Controller of the data transmission that current collecting device and voltage collecting device acquire to main circuit, controller internal calculation goes out every active power and reactive power, and calculates the capacity that capacitive coupling device group, phase ground capacitor group and power electronics compensation device are respectively necessary for switching according to watt level.Precision of the present invention is high, fast response time, not only can carry out Dynamic control to the serious distributing net platform region of three-phase load unbalance problem, can also realize that the operating status to platform area transformer is monitored.
Description
Technical field
The present invention relates to a kind of low-voltage network three-phase imbalances to administer automatic switching device and method, belongs to power quality
Governing problem technical field.
Background technique
In the power system, due to the presence of inductance and capacitor, not only there is active power in system, but also exist
Reactive power.With the development of modern industry and power electronic technique, largely having used in low-voltage network has power
The equipment for the features such as factor is low, non-linear, asymmetry, such as motor, electric welding machine, thyristor.These equipment were being run
Cheng Zhong will not only consume certain active power, also consume a large amount of reactive power.When a large amount of reactive power through transmission of electricity with
After distribution system enters electrical equipment, the power factor of power supply system can be reduced, line loss is caused, cause Voltage Drop, together
When, in the case where electrical equipment is continually accessed or exited with different capabilities and place, when low voltage three-phase energy imbalance, has
Occur, gently then reduces the power supply efficiency of route and distribution transformer, it is heavy then cause conducting wire to blow, switch and burn out or even distribution transformer
Device such as burns at the serious consequences.But low-pressure system is other than reasonable distribution load as far as possible for a long time, almost without having for what row
The means of effect are reasonably adjusted.
Summary of the invention
In view of the drawbacks of the prior art, the present invention provides a kind of three-phase imbalance controlling device and its switching strategy, by phase
Between capacitor can shift and active can also compensate active characteristic and power electronics compensation device fast response time, characteristic with high accuracy
It combines, can be with three-phase imbalance problem in Dynamic control power grid, and the operating condition of transformer is monitored.
In order to solve the technical problem, the technical solution adopted by the present invention is that:
A kind of three-phase imbalance and idle improvement automatic switching device, including control circuit, the letter being connected with control circuit
Number conditioning circuit, the main circuit being connected with signal conditioning circuit, the main circuit includes Switching Power Supply, voltage collecting device, electricity
Flow acquisition device, contactor, breaker, intelligent capacitor group and power electronics compensation device；The intelligent capacitor group includes
Compensating electric capacity between alternate compensating electric capacity and phase zero, alternate compensating electric capacity include the multiple groups capacitance adjustment branch being connected between three-phase
Road, compensating electric capacity includes the multiple groups capacitance adjustment branch being connected between each phase and zero curve between phase zero, and each road is connected with multiple
Combination switch is connected with a contactor between intelligent capacitor group and bus；The control circuit passes through current collecting device and electricity
Pressure acquisition device detects the electric current of alternate compensating electric capacity, phase ground compensating electric capacity and power electronics compensation device respectively；Control circuit
Output end connect with computer monitor software by communication module, display three-phase electricity harness status.
Further, the control circuit passes through 485 communications, 485 turns of Ethernets and Wifi communication mode and intelligent capacitor
Group and the communication of power electronics compensation device.
Further, the current collecting device and voltage collecting device acquire data are transmitted to the control of main circuit
Device, controller internal calculation go out every active power and reactive power, and according to watt level calculate capacitive coupling device group,
Phase ground capacitor group and power electronics compensation device are respectively necessary for the capacity of switching.
Further, the current collecting device is current transformer, and voltage collecting device is voltage transformer, triple line
In each phase line on be provided with a current transformer.
Connection type inside the capacitive coupling device group is triangle connection, and phase ground capacitor group inner connecting way is
Star-like connection, capacity arbitrary disposition.
Power electronics compensation device is responsible for accurate compensating three-phase unbalance and reactive power, when power electronics compensation device
When compensation capacity is limited, the automatic compensation electric current distributed between three, so that their final compensation effects are best.
A kind of three-phase imbalance and idle improvement automatic switching method, comprising the following steps:
Step 1, initialization, set three-phase current unbalance degree threshold value Uth1 and Uth2, wherein Uth1 < Uth2, setting branch
Line three-phase current acquisition time interval t0；
Step 2 acquires three-phase current and calculates three-phase current unbalance degree Un:
Wherein, UnIndicate three-phase current unbalance degree, Ia、Ib、IcRespectively collected three-phase electricity flow valuve.
The U that will be calculatednWith the threshold value comparison size of setting, if Uth1<Un<Uth2, then it represents that current unbalance factor is not
Greatly, it can directly be compensated using power electronics compensation device；If Un>Uth2, then the compensation for first carrying out capacitive coupling is needed, is held
Row step 3；Otherwise interval time t0After continue to execute step 2；
Step 3 calculates three phases active power P according to electric currenta、Pb、Pc, active mean power Pv, reactive power Qa、Qb、Qc,
And two major classes are divided into according to the size of active power:
3.1)、Pa>Pb>Pc, Pb>Pc>Pa, Pc>Pa>Pb
3.2)、Pa>Pc>Pb, Pb>Pa>Pc, Pc>Pb>Pa
Step 4 compensates for the first time: active power sorted from small to large, maximal term Px, middle entry Py, minterm is
Pz, corresponding reactive power is respectively Qx, Qy, Qz, maximal term shifts to minterm, and the active size of transfer is Pact1=Px-Pv,
Maximal term and minterm compensate idle
Active-power P after compensating for the first timex1=Pv, Py1=Py, Pz1=Pz+Pact1, reactive power Qx1=Qx+Pre1, Qy1=
Qy, Qz1=Qz+Pre1, and carry out primary idle whether the judgement of overfill if reactive power has greater than zero illustrates idle overfill
Then carry out critical compensation:
4.1), belong to that idle Q according to overfill of the 1st major class situationminRecalculate the active of transfer for the first time
4.2), belong to that idle Q according to overfill of the 2nd major class situationminRecalculate the active of transfer for the first time
Pact2=-Qmin/2.It is no to then follow the steps 5；
Step 5 compensates for second: active power adjusted for the first time sorted from small to large, maximal term Px1, intermediate
Item is Py1, minterm Pz1Corresponding reactive power is respectively Qx1, Qy1, Qz1Active maximal term is shifted to minterm, transfer
Active size is Pact2=Py1-Pv, maximal term and minterm compensation it is idleWattful power after second of compensation
Rate Px2=Px1, Py2=Py1-Pact2, Pz2=Pz1+Pact2, reactive power Qx2=Qx1, Qy2=Qy1+Pre2, Qz2=Qz1+Pre2.It goes forward side by side
Row is primary, and idle whether the judgement of overfill if reactive power has greater than zero illustrates that idle overfill carries out critical compensation:
5.1), belong to that idle Q according to overfill of the 1st major class situationminRecalculate the active of transfer for the first time
5.2), belong to that idle Q according to overfill of the 2nd major class situationminRecalculate the active of transfer for the first time
Pact4=-Qmin/2。
Step 6 calculates each capacitance for mutually needing to put into according to the active power compensated for the first time with second；
Step 7 acquires optimal switching value with nonlinear programming problem according to calculated capacitance, and switch state passes through
Binary instruction determines.0,1 coding is carried out to all switch states, the switch state of each single item there are 16 kinds, is respectively: [0 0
0 0]、[1 0 0 0]、[0 1 0 0]、[1 1 0 0]、[0 0 1 0]、[1 0 1 0]、[0 1 1 0]、[1 1 1 0]、[0
00 1], [1 00 1], [0 10 1], [1 10 1], [0 01 1], [1 01 1], [0 11 1], [1 11 1],
Then the switch state of three-phase can be expressed as the matrix that one 3 × 4 element value is 0 or 1.
Beneficial effects of the present invention: the present invention can not only carry out the serious distributing net platform region of three-phase load unbalance problem
Dynamic control can also realize that the operating status to platform area transformer is monitored.It is mended by intelligent capacitor group and power electronics
It repays device to cooperate jointly, adjusts completed by capacitive coupling adjusting branch and phase ground capacitance adjustment branch for the first time, adjust for the second time
It is completed by power electronics compensation device, not only utilizes capacitor multistage-combination post-compensation advantage with high accuracy, but also power electronics is utilized
The advantage of compensation device fast response time, improves practicability and accuracy.
Detailed description of the invention
Fig. 1 is three-phase imbalance and the idle main circuit schematic diagram for administering automatic switching device.
In figure: 1- current transformer；2- contactor；3- capacitive coupling；4- phase ground capacitor；5- breaker；6- Switching Power Supply；
7- power electronics compensation device；8- voltage transformer；9- main circuit；10- signal conditioning circuit；11 control circuits；
Fig. 2 is the system diagram of three-phase imbalance controlling device.
Fig. 3 is the flow chart of capacitor switching strategy.
Fig. 4 is the experimental result picture using the electric current before and after capacitor switching strategy provided by the invention.
Fig. 5 is the experimental result picture using the active power before and after capacitor switching strategy provided by the invention.
Fig. 6 is the experimental result picture using the reactive power before and after capacitor switching strategy provided by the invention.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
Referring to Figures 1 and 2, a kind of three-phase imbalance and idle improvement automatic switching device, including control circuit 11 and control
Circuit processed connected signal conditioning circuit 10, the main circuit 9 that is connected with signal conditioning circuit, the main circuit includes Switching Power Supply
6, voltage collecting device 8, current collecting device 1, contactor 2, breaker 5, intelligent capacitor group 34 and power electronics compensation dress
Set 7；The intelligent capacitor group includes alternate compensating electric capacity 3 and mutually compensating electric capacity 4, alternate compensating electric capacity 3 include being connected to
Multiple groups capacitance adjustment branch 3-1 between three-phase, mutually compensating electric capacity 4 includes the multiple groups capacitor tune being connected between each phase and ground
Save branch 4-1, each road be connected with combination switch, in order to facilitate the quick excision under fault condition, intelligent capacitor group with
A contactor 2 is connected between bus；Each phase line in triple line is designed with a current transformer 1；The control circuit
Alternate compensating electric capacity 3, mutually compensating electric capacity 4 and power electronics are detected respectively by current collecting device 1 and voltage collecting device 8
The electric current of compensation device 7；The control circuit 11 is separately connected alternate compensating electric capacity 3, mutually compensating electric capacity 4 and power electronics is mended
Repay device 7；Alternate compensating electric capacity and mutually the compensating electric capacity branch that respectively include four pool-sizes different include three in every group of branch
A capacity identical capacitor uses delta connection between capacitive coupling, mutually uses wye connection, 4 groups of compensation between capacitor
Capacitance are as follows: 3.33kvar, 6.66kvar, 13.32kvar, 26.64kvar.The output end of the control circuit passes through communication
Module is connect with computer monitor software, shows three-phase electricity harness status.The signal conditioning circuit 10 include voltage follower circuit,
Voltage bias scale smaller circuit and A/D converter circuit.Voltage follower circuit is isolated outside control panel and control panel circuit, guarantees
Circuit on control panel is not influenced by extraneous power network fluctuation.Since AD conversion chip input voltage is 0~5V, need to pass through electricity
Pressure biasing scale smaller circuit, the signal of output will be fed into AD conversion chip.AD conversion chip and control circuit using 16 simultaneously
Row serial bus connection type.The controller of the main circuit 9 receive after the sampled signal of conditioning inside DSP into
Row analysis, and instruction can be assigned to the pulse generating module and intelligent capacitor group of power electronics compensation device.The electric power electricity
The effect that module occurs for subpulse is that the pwm pulse for generating DSP passes through gate drivers TCP4427EOA voltage amplification, then
It is connected by ox horn plug with the power electronics compensation device IGBT drive module outside plate.The intelligent capacitor group 34 passes through
RS485 turns ethernet module and connect with the controller of main circuit 9.Led between each intelligent capacitor by ether net mode
Letter, is connected to intelligent capacitor control module by cable.Specifically, the host computer communication module refers to that RS485 turns
WIFI serial server, the connection of 485 Interface and Controler of serial server, PC machine turn virtual serial port and host computer by WIFI
Labiew communication, realizes and recalls to the monitoring of power quality, fault diagnosis and waveform.
Referring to Fig. 3, a kind of three-phase imbalance and idle improvement automatic switching method, comprising the following steps:
Step 1 calculates three-phase current voltage unbalance factor, if degree of unbalancedness is more than threshold value Uth, then pass through Current Voltage
Calculate three phases active power Pa、Pb、Pc, three phase reactive power Qa、Qb、Qc, active mean power Pv；
Step 2 is sorted from large to small three-phase that step 1 obtains is active, can be divided into 1. Pa > Pb > Pc altogether, 2.
Pa > Pc > Pb, 3. Pb > Pa > Pc, 4. Pb > Pc > Pa, 5. Pc > Pa > Pb and 6. this 6 kinds of situations of Pc > Pb > Pa；
Step 3, if it is 1. Pa > Pb > Pc the case where, a phase be transferred to the active size of c phase be Pact=Pa-Pv, Pa1
=Pa-Pact=Pv, Pb1=Pb, Pc1=Pc+Pact；A phase, b phase, c phase compensating reactive powerQa1=Qa+
Pre, Qb1=Qb+2Pre, Qc1=Qc+Pre.If overfill situation is not present in compensated a, b, c phase reactive power for the first time,
Then follow the steps 4.Otherwise critical compensation is carried out, if a, c phase overfill, compare QaAnd QcOrder of magnitude, take small one to be
Qmin, Pre '=Qmin；If b phase overfill, Pre '=- Qb/2,Pa1=Pa-Pact ', Pb1=Pb, Pc1
=Pc+Pact ', Qa1=Qa+Pre ', Qb1=Qb+2Pre ', Qc1=Qc+Pre ', then step 5 is executed, 4. 5. situation is same 1.；
The case where if it is 2. Pa > Pc > Pb, it is Pact=Pa-Pv, Pa1=Pa- that a phase, which is transferred to the active size of b phase,
Pact=Pv, Pb1=Pb+Pact, Pc1=Pc；A phase, b phase compensating reactive powerQa1=Qa+Pre, Qb1=Qb+
Pre, Qc1=Qc.If overfill situation is not present in compensated a, b phase reactive power for the first time, 4 are thened follow the steps.Otherwise into
The critical compensation of row, compares QaAnd QbOrder of magnitude, take small one be Qmin, Pre ,=Qmin,
Pa1=Pa-Pact ', Pb1=Pb+Pact ', Pc1=Pc, Qa1=Qa+Pre ', Qb1=Qb+Pre ', Qc1=Qc, then execute
Step 5,3. 6. situation is same 2.；
Step 4, the size for comparing b phase and c phase before compensating for second, if b > c, b phase are transferred to c phase, active size is
Pact=Pb1-Pv, Pa2=Pa1, Pb2=Pb1-Pact, Pc2=Pc1+Pact, b phase and c phase compensating reactive powerQa2=Qa1, Qb2=Qb1+Pre, Qc2=Qc1+Pre repay a kindness if b, c phase reactive power were not present
Condition thens follow the steps 5；Otherwise critical compensation is carried out, Q is comparedbAnd QcOrder of magnitude, take small one be Qmin, Pre '=
Qmin,
Pa2=Pa1, Pb2=Pb1-Pact ', Pc2=Pc1+Pact ', Qa2=Qa1, Qb2=Qb1+Pre ', Qc2=
Qc1+Pre ', then execute step 5；
If c > b, the direction of active transfer is that c to a arrives b, Pact=Pc1-Pv, b, c phase compensating reactive powerA phase compensating reactive power 2Pre thens follow the steps 5 if overfill situation is not present in a, b, c phase reactive power；It is no
Critical compensation is then carried out, if b, c phase overfill, compare QbAnd QcOrder of magnitude, take small one be Qmin, Pre '=
Qmin, if a phase overfill, Pre '=- Qa1/2,Pa2=Pa1, Pb2=Pb1+Pact ', Pc2=
Pc1-Pact ', Qa2=Qa1+2Pre ', Qb2=Qb1+Pre ', Qc2=Qc1+Pre ', then execute step 5；
Step 5, after having obtained switching capacity needed for active reactive, controller calculates the electricity that each compensation circuit needs to put into
Hold capacitance, action command is transmitted in the form of binary-coded on the branch switch for needing to put into.
Fig. 4-6 is to compensate the electric current of front and back, power effect using the capacitive coupling of capacitor switching strategy provided by the invention
Figure.
Active power before compensation are as follows: A phase 53.35kw, B phase 38.80kw, C phase 30.24kw；Reactive power before compensating are as follows:
A phase 47.25kvar, B phase 39.36kvar, C phase 31.49kvar.Electric current before compensating are as follows: A phase 368A, B phase 347A, C phase 228A.
Active power after compensation are as follows: A phase 41.53kw, B phase 40.55kw, C phase 39.69kw；Reactive power after compensation are as follows: A
Phase 1.43kvar, B phase 1.17kvar, C phase 1.94kvar.Electric current after compensation are as follows: A phase 266A, B phase 261A, C phase 256A.Explanation
The effect that three-phase imbalance is adjusted after capacitor investment is apparent.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, under the premise of not departing from the present invention, several improvements and modifications can also be made, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (6)
1. a kind of three-phase imbalance and idle improvement automatic switching device, it is characterised in that: the switching device includes control electricity
Road, the signal conditioning circuit being connected with control circuit, the main circuit being connected with signal conditioning circuit, the main circuit include switch
Power supply, voltage collecting device, current collecting device, contactor, breaker, intelligent capacitor group and power electronics compensation device；
The intelligent capacitor group includes alternate compensating electric capacity and mutually compensating electric capacity, alternate compensating electric capacity include being connected between three-phase
Multiple groups capacitance adjustment branch, mutually ground compensating electric capacity include the multiple groups capacitance adjustment branch being connected between each phase and ground, each
Branch road is connected with combination switch, and a contactor is connected between intelligent capacitor group and bus；The control circuit passes through electric current
Acquisition device and voltage collecting device detect the electricity of alternate compensating electric capacity, phase ground compensating electric capacity and power electronics compensation device respectively
Stream；The output end of control circuit is connect by communication module with computer monitor software, shows three-phase electricity harness status.
2. three-phase imbalance according to claim 1 and idle improvement automatic switching device, it is characterised in that: the control
Circuit is realized by 485 communications, 485 turns of Ethernets and Wifi communication pattern and intelligent capacitor group and power electronics compensation device
Communication.
3. three-phase imbalance according to claim 1 or 2 and idle improvement automatic switching device, it is characterised in that: described
Current collecting device and voltage collecting device acquire data are transmitted to the controller of main circuit, controller internal calculation goes out items
Active power and reactive power, and capacitive coupling device group, phase ground capacitor group and power electronics are calculated according to watt level
Compensation device is respectively necessary for the capacity of switching.
4. three-phase imbalance according to claim 1 or 2 and idle improvement automatic switching device, it is characterised in that: described
Connection type inside capacitive coupling device group is triangle connection, and phase ground capacitor group inner connecting way is star-like connection, is held
Measure arbitrary disposition.
5. three-phase imbalance according to claim 1 or 2 and idle improvement automatic switching device, it is characterised in that: described
Power electronics compensation device is responsible for accurate compensating three-phase unbalance and reactive power, when power electronics compensation device compensation capacity
When limited, the automatic compensation electric current distributed between three, so that their final compensation effects are best.
6. a kind of three-phase imbalance as described in claim 1 and the idle operation/cutting method administering automatic switching device and realizing,
It is characterized in that, the described method comprises the following steps:
Step 1, initialization, set three-phase current unbalance degree threshold value Uth1 and Uth2, wherein Uth1 < Uth2, set branch line three
Phase current acquisition time interval t0；
Step 2 acquires three-phase current and calculates three-phase current unbalance degree Un:
Wherein, UnIndicate three-phase current unbalance degree, Ia、Ib、IcRespectively collected three-phase electricity flow valuve；
The U that will be calculatednWith the threshold value comparison size of setting, if Uth1<Un<Uth2, then it represents that current unbalance factor is little, can
Directly to be compensated using power electronics compensation device；If Un>Uth2, then the compensation for first carrying out capacitive coupling is needed, step is executed
3；Otherwise interval time t0After continue to execute step 2；
Step 3 calculates three phases active power P according to electric currenta、Pb、Pc, active mean power Pv, reactive power Qa、Qb、Qc, and root
It is divided into two major classes according to the size of active power:
3.1)、Pa>Pb>Pc, Pb>Pc>Pa, Pc>Pa>Pb
3.2)、Pa>Pc>Pb, Pb>Pa>Pc, Pc>Pb>Pa
Step 4 compensates for the first time: active power sorted from small to large, maximal term Px, middle entry Py, minterm Pz,
Corresponding reactive power is respectively Qx, Qy, Qz, active maximal term shifts to minterm, and the active size of transfer is Pact1=Px-
Pv, maximal term and minterm compensation it is idleActive-power P after compensating for the first timex1=Pv, Py1=Py, Pz1
=Pz+Pact1, reactive power Qx1=Qx+Pre1, Qy1=Qy, Qz1=Qz+Pre1, and carry out it is primary it is idle whether the judgement of overfill, if
Reactive power has greater than zero, illustrates that idle overfill then carries out critical compensation:
4.1), belong to that idle Q according to overfill of the 1st major class situationminRecalculate the active of transfer for the first time
4.2), belong to that idle Q according to overfill of the 2nd major class situationminRecalculate the active P of transfer for the first timeact2
=-Qmin/ 2, it is no to then follow the steps 5；
Step 5 compensates for second: active power adjusted for the first time sorted from small to large, maximal term Px1, middle entry is
Py1, minterm Pz1Corresponding reactive power is respectively Qx1, Qy1, Qz1Active maximal term to minterm shift, transfer it is active
Size is Pact2=Py1-Pv, maximal term and minterm compensation it is idleActive-power P after second of compensationx2
=Px1, Py2=Py1-Pact2, Pz2=Pz1+Pact2, reactive power Qx2=Qx1, Qy2=Qy1+Pre2, Qz2=Qz1+Pre2, and carry out one
It is secondary that idle whether the judgement of overfill if reactive power has greater than zero illustrates that idle overfill carries out critical compensation:
5.1), belong to that idle Q according to overfill of the 1st major class situationminRecalculate the active of transfer for the first time
5.2), belong to that idle Q according to overfill of the 2nd major class situationminRecalculate the active P of transfer for the first timeact4
=-Qmin/2；
Step 6 calculates each capacitance for mutually needing to put into according to the active power compensated for the first time with second；
Step 7 acquires optimal switching value with nonlinear programming problem according to calculated capacitance, switch state by two into
System instruction determines, carries out 0,1 coding to all switch states, the switch state of each single item has 16 kinds, is respectively: [0 00
0]、[1 0 0 0]、[0 1 0 0]、[1 1 0 0]、[0 0 1 0]、[1 0 1 0]、[0 1 1 0]、[1 1 1 0]、[0 0
0 1], [1 00 1], [0 10 1], [1 10 1], [0 01 1], [1 01 1], [0 11 1], [1 11 1], then
The switch state of three-phase is expressed as one 3 × 4 element value as 0 or 1 matrix.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829469A (en) * | 2019-11-29 | 2020-02-21 | 国网节能服务有限公司 | Power distribution network voltage quality improvement method based on single-phase photovoltaic inverter |
| TWI771196B (en) * | 2021-09-28 | 2022-07-11 | 行政院原子能委員會核能研究所 | Grid connection strategy for a three-phase unbalanced regional grid |
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| TWI771196B (en) * | 2021-09-28 | 2022-07-11 | 行政院原子能委員會核能研究所 | Grid connection strategy for a three-phase unbalanced regional grid |
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| CN110212556B (en) | 2021-10-29 |
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