CN106877375A - A kind of microgrid and island mode take over seamlessly control method - Google Patents
A kind of microgrid and island mode take over seamlessly control method Download PDFInfo
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- CN106877375A CN106877375A CN201510914865.3A CN201510914865A CN106877375A CN 106877375 A CN106877375 A CN 106877375A CN 201510914865 A CN201510914865 A CN 201510914865A CN 106877375 A CN106877375 A CN 106877375A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004146 energy storage Methods 0.000 claims abstract description 16
- 238000011217 control strategy Methods 0.000 claims abstract description 8
- 230000008859 change Effects 0.000 claims abstract description 4
- 206010021703 Indifference Diseases 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 abstract description 4
- 238000011105 stabilization Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- H02J3/383—
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- H02J3/386—
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
A kind of microgrid and island mode take over seamlessly control method, including DG controls, microgrid Comprehensive Control and energy-storage system three parts of Comprehensive Control.Integrated control strategy proposed by the present invention ensure that before and after operational mode switching that the power-balance of microgrid, voltage and frequency are maintained in allowed band, it is possible to achieve microgrid operational mode takes over seamlessly.Microgrid Comprehensive Control realizes the automatic distribution of bearing power change, while also having played master-slave control strategy can maintain the advantage of system voltage and frequency stabilization, and reduce the dependence to main control unit, increased the reliability of system operation.Energy storage Comprehensive Control reduces the number of times of energy storage device control mode switching, the possibility of handoff failure is reduced, so as to improve microgrid reliability of operation.
Description
Technical field
Control method is taken over seamlessly the present invention relates to the switching of a kind of microgrid and island mode, more particularly to a kind of microgrid and island mode.
Background technology
Microgrid is ordinarily connected to user side, both independent operating can be disconnected with bulk power grid again, with flexibility higher and schedulability with bulk power grid networking operation.Many countries are included in following planning for the expansion of power grids, Europe and the U.S., Japan and other countries actively develop microgrid research and the technical merit of microgrid have been transitioned into application from theoretic, China has also carried out the research of microgrid and the construction of demonstration project, and such as microgrid architectural study, microgrid access the multinomial research topic of influence research to bulk power grid and the wind light mutual complementing micro-grid system Integrated Demonstration project that is put into operation in Zhangbei County for 2010 and Hainan MW grade wind-light-diesel hydrogen storage in 2011 provides multiple forms of energy to complement each other that microgrid is integrated and demonstrative project etc..
The control of microgrid is the important content of microgrid research.Major control target includes：1）Feeder line trend in regulation microgrid, independent uneoupled control is carried out to active and reactive power；2）Adjust the voltage of each micro power interface, it is ensured that the stability of voltage；3）During islet operation, it is ensured that each micro battery energy quick response, and share customer charge；4）It is smooth independently to be separated with major network, side by side according to failure situation or system needs, or the transition conversion operation for realizing the two.Wherein, micro-grid connection operation and taking over seamlessly for islet operation pattern are the emphasis and difficult point for controlling.
The content of the invention
In order to overcome micro-grid connection to run the problem with islet operation mode smooth switching control, the present invention proposes that a kind of microgrid and island mode take over seamlessly control method.
The technical solution adopted for the present invention to solve the technical problems is：The present invention with wind-light storage microgrid as research object, using the novel integrated control strategy based on energy storage, it is ensured that the stabilization of the balance, voltage and frequency of microgrid power, it is ensured that micro-grid connection/islet operation pattern takes over seamlessly.Microgrid and normal grid parallel running, provide unnecessary electric energy or the deficiency by power network supplement self generating amount, here it is being incorporated into the power networks to power network.When electric network fault is detected or the quality of power supply is unsatisfactory for requiring, microgrid can disconnect with major network is individually powered from DG to the load in microgrid, here it is islet operation.Take over seamlessly refers to ensure that voltage, the frequency of microgrid fluctuate in allowed band in handoff procedure.
Microgrid and island mode take over seamlessly three parts of Comprehensive Control of control method including DG controls, microgrid Comprehensive Control and energy-storage system.
The calculating that the DG controls pass through frequency departure and voltage, so that it is determined that DG needs exerting oneself for additional issue, realizes that frequency and the indifference of voltage are controlled using PI controllers.
The integrated control strategy that the microgrid Comprehensive Control is combined using master ＆ slave control with equity control, and use different strategies under microgrid operation and islet operation pattern.
The Comprehensive Control of the energy-storage system determines to be controlled with droop control or V/f according to voltage and frequency situation of change.
The beneficial effects of the invention are as follows：Integrated control strategy proposed by the present invention ensure that before and after operational mode switching that the power-balance of microgrid, voltage and frequency are maintained in allowed band, it is possible to achieve microgrid operational mode takes over seamlessly.Microgrid Comprehensive Control realizes the automatic distribution of bearing power change, while also having played master-slave control strategy can maintain the advantage of system voltage and frequency stabilization, and reduce the dependence to main control unit, increased the reliability of system operation.Energy storage Comprehensive Control reduces the number of times of energy storage device control mode switching, the possibility of handoff failure is reduced, so as to improve microgrid reliability of operation.
Brief description of the drawings
Fig. 1 is microgrid Comprehensive Control figure.
Fig. 2 is to take over seamlessly figure.
Fig. 3 is energy storage Comprehensive Control figure.
Specific embodiment
Fig. 1 is referred to, to realize the peak use rate of wind energy and solar energy, wind-force and photovoltaic generating system use P-Q control strategies all the time, are exerted oneself by energy storage device regulation and maintain microgrid stable operation.Under the pattern of being incorporated into the power networks, energy storage device uses droop control.After piconet island operation, when voltage deviation and frequency departure are in allowed band, energy storage device still keeps droop control, is exerted oneself according to microgrid frequency deviation and voltage deviation regulation；If voltage deviation or frequency departure exceed allowed band, it is V/f controls that energy storage device inverter is switched fast, to keep microgrid voltage and frequency stabilization.
When controller switches, in order to avoid producing larger transient state concussion, can use based on taking over seamlessly that controller state is followed.In Fig. 2, the output of V/f controller states and droop control device is designed as a negative-feedback as the input of V/f controllers so that V/f controllers follow the output of droop control device at any time before switching, it is ensured that the output state moment of two controllers is consistent.Rationally control logic switchs K1-K4 simultaneously：During using droop control, K1 and K4 is closed, and K2 and K3 is opened；During controlling tactic switch, K1 and K4 is opened, and K2 and K3 is closed.
In Fig. 3, when energy-storage system uses droop control, voltage reference value UrefWith voltage measuring value UmDifference by proportional component, export idle deviation △ Q；Frequency reference frefWith frequency measurement fmDifference by proportional component, export active deviation △ P.When microgrid △ U or △ f exceed range of operation, control mode switching is V/f controls, voltage reference value UrefWith voltage measuring value UmDifference by proportional integral link, export idle deviation △ Q；Frequency reference frefWith frequency measurement fmDifference by proportional integral link, export active deviation △ P.△ P and △ Q respectively with active and idle initial value P0、Q0Addition obtains value and power reference PrefAnd Qref；Power outer ring controller is input to active and reactive power measurement value Pm、QmIt is compared, current reference value i under dq coordinate systems is obtained by PI controllersdref、iqref；It is input to current inner loop controller and current measurement value id、iqIt is compared, and controls to realize respectively to i by corresponding pi regulatord、iqZero steady state error control.The output signal of current inner loop pi regulator is by after dq- α β conversion, you can by sinusoidal pulse width modulation (sinusoidal pulse width
Modulation, SPWM) obtain the corresponding switching drive signal S of combining invertera、Sb、Sc, so as to realize the cutting-in control of inverter.ua、ub、ucIt is the instantaneous value of inverter ac side bus three-phase voltage, ia、ib、icIt is the instantaneous value of inverter ac side bus electric current.
Claims (4)
1. a kind of microgrid and island mode take over seamlessly control method, it is characterised in that：Three parts of Comprehensive Control including DG controls, microgrid Comprehensive Control and energy-storage system.
2. microgrid as claimed in claim 1 and island mode take over seamlessly control method, it is characterised in that：The calculating that the DG controls pass through frequency departure and voltage, so that it is determined that DG needs exerting oneself for additional issue, realizes that frequency and the indifference of voltage are controlled using PI controllers.
3. microgrid as claimed in claim 1 and island mode take over seamlessly control method, it is characterised in that：The integrated control strategy that the microgrid Comprehensive Control is combined using master ＆ slave control with equity control, and use different strategies under microgrid operation and islet operation pattern.
4. microgrid as claimed in claim 1 and island mode take over seamlessly control method, it is characterised in that：The Comprehensive Control of the energy-storage system determines to be controlled with droop control or V/f according to voltage and frequency situation of change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510914865.3A CN106877375A (en) | 2015-12-13 | 2015-12-13 | A kind of microgrid and island mode take over seamlessly control method |
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| CN201510914865.3A CN106877375A (en) | 2015-12-13 | 2015-12-13 | A kind of microgrid and island mode take over seamlessly control method |
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| CN106877375A true CN106877375A (en) | 2017-06-20 |
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| CN201510914865.3A Pending CN106877375A (en) | 2015-12-13 | 2015-12-13 | A kind of microgrid and island mode take over seamlessly control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332439A (en) * | 2020-08-14 | 2021-02-05 | 长沙理工大学 | DC micro-grid on-grid and off-grid seamless switching control method |
| CN115021312A (en) * | 2022-06-16 | 2022-09-06 | 浙江中新电力工程建设有限公司自动化分公司 | Intelligent regulation and control system and method for distributed power supply multi-mode comprehensive control |
| CN117277403A (en) * | 2023-08-16 | 2023-12-22 | 湖北能源集团鄂州发电有限公司 | Micro-grid island control method |
-
2015
- 2015-12-13 CN CN201510914865.3A patent/CN106877375A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332439A (en) * | 2020-08-14 | 2021-02-05 | 长沙理工大学 | DC micro-grid on-grid and off-grid seamless switching control method |
| CN115021312A (en) * | 2022-06-16 | 2022-09-06 | 浙江中新电力工程建设有限公司自动化分公司 | Intelligent regulation and control system and method for distributed power supply multi-mode comprehensive control |
| CN117277403A (en) * | 2023-08-16 | 2023-12-22 | 湖北能源集团鄂州发电有限公司 | Micro-grid island control method |
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Application publication date: 20170620 |
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| WD01 | Invention patent application deemed withdrawn after publication |