CN110071515A - A kind of more microgrid Voltage unbalance compensation methodes based on Two-stage control - Google Patents
A kind of more microgrid Voltage unbalance compensation methodes based on Two-stage control Download PDFInfo
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- CN110071515A CN110071515A CN201910399360.6A CN201910399360A CN110071515A CN 110071515 A CN110071515 A CN 110071515A CN 201910399360 A CN201910399360 A CN 201910399360A CN 110071515 A CN110071515 A CN 110071515A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims abstract description 30
- 238000005859 coupling reaction Methods 0.000 claims abstract description 30
- 230000008878 coupling Effects 0.000 claims abstract description 25
- 230000003252 repetitive effect Effects 0.000 claims abstract description 12
- 238000013461 design Methods 0.000 claims abstract description 8
- 230000009466 transformation Effects 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 238000012546 transfer Methods 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000002035 prolonged effect Effects 0.000 claims 1
- 230000010485 coping Effects 0.000 abstract description 3
- 238000011217 control strategy Methods 0.000 description 14
- 238000004146 energy storage Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UEJYSALTSUZXFV-SRVKXCTJSA-N Rigin Chemical compound NCC(=O)N[C@@H](CCC(N)=O)C(=O)N1CCC[C@H]1C(=O)N[C@@H](CCCN=C(N)N)C(O)=O UEJYSALTSUZXFV-SRVKXCTJSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000001914 filtration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
Abstract
Voltage at a kind of more microgrid Voltage unbalance compensation methodes based on Two-stage control, including the more microgrid point of common coupling of sampling, is transmitted to Two-stage control after being carried out Park Transformation, based on voltage unbalance factor VUF at point of common couplingPCCWith reference value VUF*Between difference, calculate imbalance compensation reference value UCRdqDesign quasi- ratio resonant controller: design repetitive controller, repetitive controller includes internal model control M (s) and compensator K, relative to traditional voltage compensating method, control method of the present invention can make output voltage have preferable power quality and stronger stability when coping with the scenes such as Voltage unbalance and output-power fluctuation.
Description
Technical field
The invention belongs to more microgrid voltage control technology fields, in particular to a kind of more microgrid voltages based on Two-stage control
Imbalance compensation method.
Background technique
With the fast development of microgrid, mutually supplied between multiple adjacent micro-capacitance sensors by interconnecting within a certain area
The more micro-grid systems formed receive significant attention.More microgrids are the in-depth and continuity of micro-capacitance sensor, the stability contorting operation of more microgrids
It is the key that each electrical equipment normal table operation maintained in whole region, in remote village area, border on the sea islands and reefs and city
There is biggish application value in town distribution end etc..When there are unbalanced loads or three single-phase nets and three-phase for the more microgrids of single three-phase
When Tie line Power is not harmonious between microgrid, it is all likely to occur voltage imbalance question.For this reason, it is necessary to be directed to more
Microgrid voltage imbalance question is studied, so that the stability contorting operation for more microgrids provides safeguard.
The document of the prior art, document Optimal sizing and control strategy of isolated
grid with wind power and energy storage system(Luo Y,Shi L,Tu G.Optimal
sizing and control strategy of isolated grid with wind power and energy
Storage system [J] .Energy Conversion and Management, 2014,80:407-415.) propose one
Kind double-layer control structure.The voltage control strategy is also used to compensate while maintaining voltage stabilization unbalanced in whole system
Active power and reactive power, but the voltage control strategy dynamic characteristic is not ideal enough.
Document Cooperative Control Strategy of Energy Storage System and
Microsources for Stabilizing the Microgrid during Islanded Operation(Jong-Yul
K,Jin-Hong J,Seul-Ki K,et al.Cooperative Control Strategy of Energy Storage
System and Microsources for Stabilizing the Microgrid during Islanded
Operation [J] .IEEE Transactions on Power Electronics, 2010,25 (12): 3037-3048.) it mentions
A kind of collaboration voltage control strategy based on energy-storage system is gone out.The strategy is controlled by the reasonable coordination to energy storing and electricity generating power
Realize the adjusting to entire microgrid voltage.However, the control strategy is but and unresolved inverter end mouth voltage imbalance question.
Document " the voltage unbalance factor compensation method under low pressure micro-capacitance sensor multi-inverter parallel " (Zhou Jie, Luo An, Chen Yan
Voltage unbalance factor compensation method electric power network technique under eastern low pressure micro-capacitance sensor multi-inverter parallel, 2014,38 (2): 412-
418.) propose that eliminate negative phase-sequence reactive power be control target, it is real by introducing the uneven sagging control ring of the idle conductance of negative phase-sequence
The control method of existing inverter end dipped ring weighing apparatus voltage compensation.But the document does not consider but to electricity uneven at point of common coupling
Pressure compensates.
Summary of the invention
Against the above deficiency, the present invention proposes a kind of more microgrid Voltage unbalance compensation methodes based on Two-stage control, should
Method is divided into two-step evolution, the novel voltage control strategy that primary control is made of the control of quasi- ratio resonance with Repetitive controller；
Two-stage control generates imbalance compensation signal by voltage at sampling point of common coupling and transmits it to primary control, to realize
Adjusting to more microgrid voltages.Relative to traditional voltage compensating method, control method of the present invention reply Voltage unbalance and
When the scenes such as output-power fluctuation, it can make output voltage that there is preferable power quality and stronger stability.
The technical scheme adopted by the invention is as follows:
A kind of more microgrid Voltage unbalance compensation methodes based on Two-stage control, comprising the following steps:
Step 1: voltage at more microgrid point of common coupling is sampled, is transmitted to Two-stage control after being carried out Park Transformation, it is public
The Park Transformation calculation formula of voltage is as follows at Coupling point altogether:
Wherein, ua、ub、ucA, b, c three-phase voltage, u respectively at point of common couplingd、uqD respectively after Park Transformation
Axis, q axis component.
Step 2: based on voltage unbalance factor VUF at point of common couplingPCCWith reference value VUF*Between difference, calculate not
Balanced compensated reference value UCRdq,
Voltage unbalance factor calculation method at point of common coupling:
Wherein, VUFPCCFor voltage unbalance factor；For d axis negative sequence voltage at point of common coupling；At point of common coupling
Q axis negative sequence voltage；For d axis positive sequence voltage at point of common coupling；For q axis positive sequence voltage at point of common coupling.
Imbalance compensation reference value UCRdqCalculation method:
Wherein,For the negative sequence voltage of d, q axis at point of common coupling, kpFor proportionality coefficient, kiFor integral coefficient, s is
Complex frequency domain operator.
Step 3: design quasi- ratio resonant controller:
Quasi- ratio resonant controller transmission function are as follows:
Wherein, kQpFor scale parameter, kQiIt is directly proportional to peak gain for resonant parameter, act the work for reducing steady-state error
With ω1For cutoff frequency, the bandwidth of controller is determined, s is complex frequency domain operator, ω0For resonance fundamental wave frequency.
Step 4: design repetitive controller:
Repetitive controller includes internal model control M (s) and compensator K, the transmission function of internal model control are as follows:
Wherein, τdIndicating the period of control signal, s is complex frequency domain operator,Indicate that delay link, R (s) are low-pass filtering
The transmission function of device.
It converts the design of compensator K to and solves H∞Typical problem is controlled, according to H∞Typical problem is controlled, system inputs w
=[vg1 iref a]T, system output z=[ze zu zt]T, the closed-loop system output-transfer function matrix comprising repetitive controller
Form may be expressed as:
Wherein, vg1For network voltage, irefFor reference current, a is the output of internal model delay link；ze、zuAnd ztIn expression
Input, control output and the system output quantity of mould delay link；U' indicates control output signal, and y indicates to measure output signal, G
For generalized transfer function matrix, K is controller to be designed.
H∞Control problem can be attributed to the H for the closed loop transfer function, for making to input w to output z∞Least norm is based on H∞Control
Typical problem passes through above-mentioned closed-loop system output-transfer function Matrix Solving compensator K.
Using the above scheme, system stability is enhanced the present invention, and output electricity can be made when coping with Voltage unbalance
Pressing element has preferable power quality.
A kind of more microgrid Voltage unbalance compensation methodes based on Two-stage control of the present invention, this method is by two-step evolution group
At can be applied to the single three Voltage unbalances compensation for mixing more microgrids.Primary control is using based on quasi- ratio resonance and again
The novel voltage control strategy controlled again；Two-stage control calculates voltage unbalance factor by voltage at sampling point of common coupling
(VUF), it then generates imbalance compensation signal and is transmitted to primary control, to realize the adjusting to more microgrid voltages.
The method of the invention can make output voltage have preferable power quality when coping with more microgrid Voltage unbalances.
Detailed description of the invention
Fig. 1 is more microgrid structure charts.
Fig. 2 is Two-stage control structural block diagram of the present invention.
Fig. 3 is degree of unbalancedness test waveform figure when accessing unbalanced load at point of common coupling.
Specific embodiment
Below with reference to examples and drawings, the present invention is done and is further described in detail, but embodiments of the present invention are not
It is limited to this.
Fig. 1 is more microgrid structure charts.More microgrids are made of 4 micro-capacitance sensors, and wherein micro-capacitance sensor 1 is for three phase network and entire
It plays a leading role in more microgrids, micro-capacitance sensor 2,3 and 4 is single-phase micro-capacitance sensor and is connected by breaker with micro-capacitance sensor 1, entirely mostly micro-
Netcom crosses simultaneously/suspension switch L1 and is connected with power distribution network.When L1 is disconnected, more microgrids are switched to isolated operation mode, by micro-capacitance sensor 1
In energy storage device for its excess-three micro-capacitance sensor provide voltage and frequency support.Since status is more in more microgrids for micro-capacitance sensor 1
It is important, in order to guarantee quality of voltage of more microgrids in isolated operation, reliable performance need to be configured to the energy storage device in micro-capacitance sensor 1
Control strategy.Wherein energy storage main circuit parameter:
Capacity 30KVA, 380V (LL), 50Hz, filter inductance Lf1=1.3mH, resistance Rf1=0.1mH, filter capacitor Cf1=
50 μ F, switching frequency fsw1=10kHz.
Fig. 2 is Two-stage control structural block diagram of the present invention.More microgrid Two-stage control strategies pass through electricity at acquisition point of common coupling
Press vPCC, Two-stage control is transmitted it under Park Transformation and calculates voltage unbalance factor VUFPCC, then by reference value
VUF*With actual value VUFPCCIt is compared to obtain imbalance compensation reference value UCRdq.More microgrid primary controls, which use, is based on quasi- ratio
The novel voltage control strategy of example resonance and Repetitive controller.In Fig. 2By imbalance compensation reference value UCR in Two-stage controldqWith
Actual voltage value Vαβ, reference value VαβrefDifference through then being driven by pulsewidth modulation obtained by quasi- ratio resonance and Repetitive controller
Switching tube work, and then realize the control to inverter output voltage.
Closed-loop system output-transfer function matrix form comprising repetitive controller may be expressed as:
In above formula, system inputs w=[vg1 iref a]T, wherein vg1For network voltage, irefFor reference current, a is internal model
The output of delay link；System exports z=[ze zu zt]T, wherein ze、zuAnd ztIndicate input, the control of internal model delay link
Output and system output quantity；U' indicates control output signal, and y indicates to measure output signal, and G is generalized transfer function matrix, and K is
Controller to be designed.
Quasi- ratio resonant controller GQPR(s) in: kQp=1, kQi=175, ξ=0.015, ω0=314rad/s.Therefore:
Fig. 3 is degree of unbalancedness waveform diagram when accessing unbalanced load at point of common coupling.In Fig. 3 in voltage unbalance factor
VpAnd VnRespectively represent the positive-sequence component and negative sequence component of voltage.As can be seen from Figure 3 at the 0.4s moment, when in more microgrids
When accessing single-phase unbalanced load, R=6 Ω, L=4mH, based on electricity at the micro-capacitance sensor point of common coupling under Traditional control effect
Pressing degree of unbalancedness is about 2%, compared with based on control effect of the Traditional control when cope with unbalanced load, based on this patent institute
Mentioning voltage unbalance factor at the micro-capacitance sensor point of common coupling under control strategy effect is about 1%.The comparing result table of above-mentioned test
Bright the mentioned method of the present invention can be effectively improved voltage unbalance factor, obtain better power quality.
Claims (1)
1. a kind of more microgrid Voltage unbalance compensation methodes based on Two-stage control, comprising the following steps:
Step 1: sampling voltage at more microgrid point of common coupling, be transmitted to Two-stage control, public coupling after being carried out Park Transformation
The Park Transformation calculation formula of voltage is as follows at chalaza:
Wherein, ua、ub、ucA, b, c three-phase voltage, u respectively at point of common couplingd、uqD axis, q axis respectively after Park Transformation
Component；
Step 2: based on voltage unbalance factor VUF at point of common couplingPCCWith reference value VUF*Between difference, calculate uneven mend
Repay reference value UCRdq,
Voltage unbalance factor calculation method at point of common coupling:
Wherein, VUFPCCFor voltage unbalance factor；For d axis negative sequence voltage at point of common coupling；For q axis at point of common coupling
Negative sequence voltage；For d axis positive sequence voltage at point of common coupling；For q axis positive sequence voltage at point of common coupling；
Imbalance compensation reference value UCRdqCalculation method:
Wherein,For the negative sequence voltage of d, q axis at point of common coupling, kpFor proportionality coefficient, kiFor integral coefficient, s is multifrequency
Domain operator；
Step 3: design quasi- ratio resonant controller:
Quasi- ratio resonant controller transmission function are as follows:
Wherein, kQpFor scale parameter, kQiIt is directly proportional to peak gain for resonant parameter, play a part of to reduce steady-state error, ω1
For cutoff frequency, the bandwidth of controller is determined, s is complex frequency domain operator, ω0For resonance fundamental wave frequency；
Step 4: design repetitive controller:
Repetitive controller includes internal model control M (s) and compensator K, the transmission function of internal model control are as follows:
Wherein, τdIndicating the period of control signal, s is complex frequency domain operator,Indicate that delay link, R (s) are low-pass filter
Transmission function；
It converts the design of compensator K to and solves H∞Typical problem is controlled, according to H∞Typical problem is controlled, system inputs w=[vg1
iref a]T, system output z=[ze zu zt]T, the closed-loop system output-transfer function matrix form comprising repetitive controller can table
It is shown as:
Wherein, vg1For network voltage, irefFor reference current, a is the output of internal model delay link；ze、zuAnd ztIndicate that internal model is prolonged
Input, control output and the system output quantity of slow link；U' indicates control output signal, and y indicates to measure output signal, and G is wide
Adopted transfer function matrix, K are controller to be designed；
Based on H∞Typical problem is controlled, above-mentioned closed-loop system output-transfer function Matrix Solving compensator K is passed through.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601198A (en) * | 2019-10-30 | 2019-12-20 | 国网浙江省电力有限公司宁波供电公司 | Hybrid micro-grid optimized operation method considering harmonic and voltage unbalance constraints |
| CN112821375A (en) * | 2021-03-19 | 2021-05-18 | 中车青岛四方车辆研究所有限公司 | Charger output voltage harmonic suppression method and system based on composite control |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110106322A1 (en) * | 2009-10-30 | 2011-05-05 | Institute Of Nuclear Energy Research Atomic Energy Council, Executive Yuan | Network connection manner of microgrid energy storage backup power source, and method for dispatching the same |
| CN102832840A (en) * | 2012-08-16 | 2012-12-19 | 卧龙电气集团股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
| CN104953606A (en) * | 2015-07-20 | 2015-09-30 | 兰州理工大学 | Networked layered compensation method for voltage unbalance of PCC (Point of Common Coupling) of islanded microgrid |
| CN105743109A (en) * | 2016-04-19 | 2016-07-06 | 大连理工大学 | Phase-locked loop applicable to power grid voltage unbalance and distortion states |
| CN106532749A (en) * | 2016-12-27 | 2017-03-22 | 合肥工业大学 | Unbalanced power and harmonic voltage compensation system for micro-grid and application of system |
| US20170288561A1 (en) * | 2016-03-30 | 2017-10-05 | Ideal Power, Inc. | Microgrid Power Architecture |
| CN107332261A (en) * | 2017-08-11 | 2017-11-07 | 兰州理工大学 | A kind of micro-capacitance sensor quality of power supply distributed coordination administering method |
| CN108808682A (en) * | 2018-06-01 | 2018-11-13 | 三峡大学 | Single three based on compound robust control mix more microgrid voltage control methods |
-
2019
- 2019-05-14 CN CN201910399360.6A patent/CN110071515A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110106322A1 (en) * | 2009-10-30 | 2011-05-05 | Institute Of Nuclear Energy Research Atomic Energy Council, Executive Yuan | Network connection manner of microgrid energy storage backup power source, and method for dispatching the same |
| CN102832840A (en) * | 2012-08-16 | 2012-12-19 | 卧龙电气集团股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
| CN104953606A (en) * | 2015-07-20 | 2015-09-30 | 兰州理工大学 | Networked layered compensation method for voltage unbalance of PCC (Point of Common Coupling) of islanded microgrid |
| US20170288561A1 (en) * | 2016-03-30 | 2017-10-05 | Ideal Power, Inc. | Microgrid Power Architecture |
| CN105743109A (en) * | 2016-04-19 | 2016-07-06 | 大连理工大学 | Phase-locked loop applicable to power grid voltage unbalance and distortion states |
| CN106532749A (en) * | 2016-12-27 | 2017-03-22 | 合肥工业大学 | Unbalanced power and harmonic voltage compensation system for micro-grid and application of system |
| CN107332261A (en) * | 2017-08-11 | 2017-11-07 | 兰州理工大学 | A kind of micro-capacitance sensor quality of power supply distributed coordination administering method |
| CN108808682A (en) * | 2018-06-01 | 2018-11-13 | 三峡大学 | Single three based on compound robust control mix more microgrid voltage control methods |
Non-Patent Citations (2)
| Title |
|---|
| MEHDI SAVAGHEBI 等: "Secondary Control Scheme for Voltage Unbalance Compensation in an Islanded Droop-Controlled Microgrid", 《IEEE TRANSACTIONS ON SMART GRID》 * |
| 王灿: "单三相孤岛光储多微网控制策略研究", 《中国优秀博硕士学位论文全文数据库(博士) 工程科技Ⅱ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601198A (en) * | 2019-10-30 | 2019-12-20 | 国网浙江省电力有限公司宁波供电公司 | Hybrid micro-grid optimized operation method considering harmonic and voltage unbalance constraints |
| CN112821375A (en) * | 2021-03-19 | 2021-05-18 | 中车青岛四方车辆研究所有限公司 | Charger output voltage harmonic suppression method and system based on composite control |
| CN112821375B (en) * | 2021-03-19 | 2024-03-22 | 中车青岛四方车辆研究所有限公司 | Method and system for suppressing output voltage harmonic waves of charger based on compound control |
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