CN102403736A - Method and system for switching microgrid from island mode to grid connected mode - Google Patents
Method and system for switching microgrid from island mode to grid connected mode Download PDFInfo
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- CN102403736A CN102403736A CN2011104263093A CN201110426309A CN102403736A CN 102403736 A CN102403736 A CN 102403736A CN 2011104263093 A CN2011104263093 A CN 2011104263093A CN 201110426309 A CN201110426309 A CN 201110426309A CN 102403736 A CN102403736 A CN 102403736A
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
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Abstract
The invention, belonging to the field of dispatching and management of a distribution network, provides a method and system for switching a microgrid from an island mode to a grid connected mode. The criterion for switching a microgrid system from the island mode to the grid connected mode is that: an external electric network is detected to return to normal; after the external electric network returns to normal, if the electric network side voltage of a grid connected contact breaker is monitored to be normal and is lasted for a certain time, operations of a fan, a photovoltaic inverter system and an energy storage system of a storage battery are stopped, and a load in the microgrid system is disconnected with the power; the grid connected contact breaker of the microgrid system is closed, and the load is powered with the external electric network; after the grid connected contact breaker of the microgrid system is closed, the devices such as the fan, the photovoltaic inverter system and the like are reconnected to the grid for operation, so that a stable operation of the microgrid system in a transient state process of switching from the island mode and the grid connected mode is ensured, the transient time is shortened, the requirements of the microgrid system in safety, reliability and quick response are satisfied, and the controllability in the switching process is improved. The method and system have the characteristics of quickness, stability and reliability.
Description
Technical field
The invention belongs to power distribution network scheduling and management domain, relate in particular to a kind of microgrid that is used for by the method and system of isolated island pattern to the mode switch that is incorporated into the power networks.
Background technology
The microgrid system is under the islet operation pattern; When external electrical network is recovered later on normal or is according to circumstances needed microgrid to be incorporated into the power networks; The microgrid system should switch to the pattern of being incorporated into the power networks rapidly, and there is irrationality in existing microgrid system from the isolated island mode switch to the pattern of being incorporated into the power networks, and is longer like switching time; Intermittent outage can appear in load, is difficult to satisfy that the microgrid system safety is reliable, the rapid-action requirement.
Summary of the invention
The invention provides a kind of microgrid that is used for by the method and system of isolated island pattern to the mode switch that is incorporated into the power networks; There is more irrationality in the method for microgrid system from the isolated island mode switch to the pattern of being incorporated into the power networks that being intended to solve prior art provides; Switching time is longer; Intermittent outage can appear in load, is difficult to satisfy that the microgrid system safety is reliable, the problem of fast reaction requirement.
The object of the present invention is to provide a kind of microgrid that is used for by the method for isolated island pattern to the mode switch that is incorporated into the power networks, this method may further comprise the steps:
Set the microgrid system by the threshold voltage U1 of isolated island pattern to the mode switch that is incorporated into the power networks;
The external electrical network voltage U 2 that monitoring in real time is connected with the microgrid system;
According to the relation of external electrical network voltage U 2 with threshold voltage U1, system operates accordingly to microgrid.
Another object of the present invention is to provide a kind of microgrid that is used at isolated island and the system that is incorporated into the power networks and switches between the pattern, this system comprises:
The threshold voltage settings module is used to set the microgrid system by the threshold voltage U1 of isolated island pattern to the mode switch that is incorporated into the power networks;
The line voltage monitoring modular is used for the external electrical network voltage U 2 that monitoring in real time is connected with the microgrid system;
The pattern operational module is used for according to the relation of external electrical network voltage U 2 with threshold voltage U1, and system operates accordingly to microgrid.
The microgrid that is used for provided by the invention is by the method and system of isolated island pattern to the mode switch that is incorporated into the power networks, and it is to detect external electrical network to recover normal that the microgrid system switches to the criterion that is incorporated into the power networks from islet operation, after external electrical network is recovered normally; If after monitoring the normal also certain time of the network interconnecting circuit grid side voltage that is incorporated into the power networks; Stop blower fan, photovoltaic inversion system and the operation of batteries to store energy system simultaneously, microgrid system internal loading dead electricity is assigned the network interconnecting circuit that the closed microgrid of instruction system is incorporated into the power networks then; Load is supplied power by external electrical network; After the network interconnecting circuit closure that the microgrid system is incorporated into the power networks, blower fan, photovoltaic inversion system and batteries to store energy system are incorporated into the power networks again, have satisfied the microgrid system by the stable operation of isolated island pattern in the transient process of the mode switch that is incorporated into the power networks; Reduced transient state transit time effectively; Satisfied reliable, the rapid-action requirement of microgrid system safety, improved the controllability of microgrid system in the mode switch process, had fast, stable, reliable characteristics.
Description of drawings
What Fig. 1 showed that the embodiment of the invention provides is used for microgrid by the realization flow figure of isolated island pattern to the method for the mode switch that is incorporated into the power networks;
Fig. 2 be the embodiment of the invention provide when external electrical network voltage U 2 is higher than threshold voltage U1, the microgrid system is carried out by the flow chart of isolated island pattern to the implementation method of the mode switch that is incorporated into the power networks;
Fig. 3 shows that the embodiment of the invention provides is used for microgrid at isolated island and the structured flowchart of the system switched between the pattern of being incorporated into the power networks.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further specified below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in the qualification invention.
What Fig. 1 showed that the embodiment of the invention provides is used for microgrid by the realization flow of isolated island pattern to the method for the mode switch that is incorporated into the power networks.
This method may further comprise the steps:
In step S101, set the microgrid system by the threshold voltage U1 of isolated island pattern to the mode switch that is incorporated into the power networks;
In step S102, the external electrical network voltage U 2 that monitoring in real time is connected with the microgrid system;
In step S103, according to the relation of external electrical network voltage U 2 with threshold voltage U1, system operates accordingly to microgrid.
In embodiments of the present invention, this method further comprises:
When external electrical network voltage U 2 is higher than threshold voltage U1, the microgrid system is carried out by the isolated island pattern to the mode switch that is incorporated into the power networks;
When external electrical network voltage U 2 was lower than threshold voltage U1, the microgrid system kept the isolated island pattern constant.
As shown in Figure 2, in embodiments of the present invention, when external electrical network voltage U 2 is higher than threshold voltage U1, the microgrid system carried out by the isolated island pattern be to the implementation method of the mode switch that is incorporated into the power networks:
In step S201, when external electrical network voltage U 2 during greater than threshold voltage U1, the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode;
In step S202, blower fan, photovoltaic inversion system and batteries to store energy system temporarily quit work;
In step S203, system converts the pattern of being incorporated into the power networks into batteries to store energy;
In step S204, the network interconnecting circuit between closed microgrid system and the external electrical network;
In step S205, blower fan, photovoltaic inversion system are incorporated the microgrid system again into and are generated electricity.
In embodiments of the present invention, threshold voltage U1 can be set at 202V.
In embodiments of the present invention, the off-the-line of microgrid system and principle arranged side by side are:
During the external electrical network fault, the intrasystem distributed power source of microgrid should be able to be before network interconnecting circuit carries out the off-the-line operation, and quick and external electrical network is broken off;
Network interconnecting circuit between microgrid system and the external electrical network should have and prevents unplanned isolated island defencive function, prevents the appearance of unplanned isolated island, brings potential safety hazard for the safe operation of higher level's electrical network;
The microgrid system main power source mode switch time can adjust according to the operate time of avoiding power distribution automation or other automatics;
When microgrid system and external electrical network are incorporated into the power networks, should guarantee that all distributed power sources are out of service, non-simultaneous interconnecting problem can not occur;
The distribution system protection that inserts the microgrid system principle of adjusting need be taken all factors into consideration all distributed power sources are provided in the microgrid maximum short circuit current and maximum load current;
Bring off-the-line operation, parallel operation, the internal protection unification of microgrid system into microgrid system capacity management system, realize that the protection monitoring of microgrid is integrated.
Fig. 3 shows that the embodiment of the invention provides is used for microgrid at isolated island and the structure of the system switched between the pattern of being incorporated into the power networks.For the ease of explanation, only show the part relevant with the present invention.
This system comprises:
Threshold voltage settings module 31 is used to set the microgrid system by the threshold voltage U1 of isolated island pattern to the mode switch that is incorporated into the power networks;
Line voltage monitoring modular 32 is used for the external electrical network voltage U 2 that monitoring in real time is connected with the microgrid system;
Pattern operational module 33 is used for according to the relation of external electrical network voltage U 2 with threshold voltage U1, and system operates accordingly to microgrid.
In embodiments of the present invention, pattern operational module 33 further comprises:
Pattern keeps module 331, is used for when external electrical network voltage U 2 is lower than threshold voltage U1, and the microgrid system keeps the isolated island pattern constant;
Mode switch module 332 is used for when external electrical network voltage U 2 is higher than threshold voltage U1, the microgrid system being carried out by the isolated island pattern to the mode switch that is incorporated into the power networks.
In embodiments of the present invention, mode switch module 332 further comprises:
Microgrid isolated location 3321 is used for when external electrical network voltage U 2 during greater than threshold voltage U1, and the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode, and blower fan, photovoltaic inversion system and batteries to store energy system temporarily quit work;
The mode switch element 3322 that is incorporated into the power networks is used for converting the batteries to store energy system into being incorporated into the power networks pattern;
Microgrid switching unit 3323 is used for the network interconnecting circuit between closed microgrid system of microgrid and the external electrical network, and blower fan, photovoltaic inversion system are incorporated the microgrid system again into and generated electricity.
Below in conjunction with accompanying drawing and specific embodiment application principle of the present invention is further described.
Change the stable operation in the mode switch process that is incorporated into the power networks in order to satisfy present microgrid system in the isolated island pattern; What the embodiment of the invention provided is used for microgrid by the method and system of isolated island pattern to the mode switch that is incorporated into the power networks; Can realize steady, the reliable switching of isolated island pattern to the pattern of being incorporated into the power networks, the microgrid system is under the islet operation pattern, when external electrical network is recovered later on normal or according to circumstances needed microgrid to be incorporated into the power networks; The closed microgrid switch that is incorporated into the power networks; Photovoltaic inversion system, blower fan and batteries to store energy system are incorporated into the power networks again, have improved the controllability of microgrid system in the mode switch process, have fast, stable, reliable characteristics and important and practical meanings.
As shown in Figure 2; During the piconet island operation; Circuit breaker is in open mode if external electrical network voltage is higher than 202v and the circuit-breaker status that is incorporated into the power networks is incorporated into the power networks, and then operational mode switches to isolated island changes the transient state pattern that is incorporated into the power networks, and at first stops blower fan, photovoltaic inversion system inverter and batteries to store energy system; The batteries to store energy system transfers the pattern of being incorporated into the power networks to then, then be incorporated into the power networks killer switch and incorporate photovoltaic inversion system, blower fan into microgrid again and generate electricity of closure again.
It is to detect external electrical network to recover normal that the microgrid system switches to the criterion that is incorporated into the power networks from independent operating; If after detecting the normal also certain time of the switch grid side voltage that is incorporated into the power networks; Stop blower fan, photovoltaic inversion system and the operation of batteries to store energy system simultaneously; Microgrid internal loading dead electricity is assigned the closed microgrid of the instruction switch that is incorporated into the power networks then, and load is by mains supply.Microgrid is incorporated into the power networks behind the switch closure, and blower fan, photovoltaic inversion system and batteries to store energy system are incorporated into the power networks again.
The microgrid system separates principle arranged side by side:
(1) during the external electrical network fault, the intrasystem distributed power source of microgrid should be able to be before the switch that is incorporated into the power networks carries out the off-the-line operation, fast with the electrical network disconnection;
(2) the microgrid system switch that is incorporated into the power networks should have and prevents unplanned isolated island defencive function, prevents the appearance of unplanned isolated island, brings potential safety hazard for the safe operation of higher level's electrical network;
(3) the microgrid system main power source mode switch time can adjust according to the operate time of avoiding power distribution automation or other automatics;
When (4) the microgrid system is incorporated into the power networks, should guarantee that all distributed power sources are out of service again, non-simultaneous interconnecting problem can not occur;
(5) the distribution system protection that inserts the microgrid system principle of adjusting need be taken all factors into consideration maximum short circuit current and the maximum load current that all distributed power sources provided in the microgrid system;
(6) with microgrid system splitting, parallel operation, the unified microgrid EMS of bringing into of microgrid internal system protection, realize that the protection monitoring of microgrid is integrated.
What the embodiment of the invention provided is used for microgrid by the method and system of isolated island pattern to the mode switch that is incorporated into the power networks, and it is to detect external electrical network to recover normal that the microgrid system switches to the criterion that is incorporated into the power networks from islet operation, after external electrical network is recovered normally; If after monitoring the normal also certain time of the network interconnecting circuit grid side voltage that is incorporated into the power networks; Stop blower fan, photovoltaic inversion system and the operation of batteries to store energy system simultaneously, microgrid system internal loading dead electricity is assigned the network interconnecting circuit that the closed microgrid of instruction system is incorporated into the power networks then; Load is supplied power by external electrical network; After the network interconnecting circuit closure that the microgrid system is incorporated into the power networks, blower fan, photovoltaic inversion system and batteries to store energy system are incorporated into the power networks again, have satisfied the microgrid system by the stable operation of isolated island pattern in the transient process of the mode switch that is incorporated into the power networks; Reduced transient state transit time effectively; Satisfied reliable, the rapid-action requirement of microgrid system safety, improved the controllability of microgrid system in the mode switch process, had fast, stable, reliable characteristics.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. one kind is used for microgrid by the method for isolated island pattern to the mode switch that is incorporated into the power networks, and it is characterized in that this method may further comprise the steps:
Set the microgrid system by the threshold voltage U1 of isolated island pattern to the mode switch that is incorporated into the power networks;
The external electrical network voltage U 2 that monitoring in real time is connected with the microgrid system;
According to the relation of external electrical network voltage U 2 with threshold voltage U1, system operates accordingly to microgrid.
2. the method for claim 1 is characterized in that, said method further comprises:
When external electrical network voltage U 2 is higher than threshold voltage U1, the microgrid system is carried out by the isolated island pattern to the mode switch that is incorporated into the power networks;
When external electrical network voltage U 2 was lower than threshold voltage U1, the microgrid system kept the isolated island pattern constant.
3. method as claimed in claim 2 is characterized in that, in the said method, when external electrical network voltage U 2 is higher than threshold voltage U1, the microgrid system carried out by the isolated island pattern be to the implementation method of the mode switch that is incorporated into the power networks:
When external electrical network voltage U 2 during greater than threshold voltage U1, the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode;
Blower fan, photovoltaic inversion system and batteries to store energy system temporarily quit work;
System converts the pattern of being incorporated into the power networks into batteries to store energy;
Network interconnecting circuit between closed microgrid system and the external electrical network;
Blower fan, photovoltaic inversion system are incorporated the microgrid system again into and are generated electricity.
4. the method for claim 1 is characterized in that, the threshold voltage U1 in the said method can be set at 202V.
5. one kind is used for microgrid at isolated island and the system that is incorporated into the power networks and switches between the pattern, it is characterized in that this system comprises:
The threshold voltage settings module is used to set the microgrid system by the threshold voltage U1 of isolated island pattern to the mode switch that is incorporated into the power networks;
The line voltage monitoring modular is used for the external electrical network voltage U 2 that monitoring in real time is connected with the microgrid system;
The pattern operational module is used for according to the relation of external electrical network voltage U 2 with threshold voltage U1, and system operates accordingly to microgrid.
6. system as claimed in claim 5 is characterized in that, said pattern operational module further comprises:
Mode switch module is used for when external electrical network voltage U 2 is higher than threshold voltage U1, and the microgrid system is carried out by the isolated island pattern to the mode switch that is incorporated into the power networks;
Pattern keeps module, is used for when external electrical network voltage U 2 is lower than threshold voltage U1, and the microgrid system keeps the isolated island pattern constant.
7. system as claimed in claim 6 is characterized in that, said mode switch module further comprises:
The microgrid isolated location is used for when external electrical network voltage U 2 during greater than threshold voltage U1, and the network interconnecting circuit between checking microgrid system and the external electrical network is in open mode, and blower fan, photovoltaic inversion system and batteries to store energy system temporarily quit work;
The mode switch element that is incorporated into the power networks is used for converting the batteries to store energy system into being incorporated into the power networks pattern;
Microgrid switching unit is used for the network interconnecting circuit between closed microgrid system of microgrid and the external electrical network, and blower fan, photovoltaic inversion system are incorporated the microgrid system again into and generated electricity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104263093A CN102403736A (en) | 2011-12-19 | 2011-12-19 | Method and system for switching microgrid from island mode to grid connected mode |
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| CN2011104263093A CN102403736A (en) | 2011-12-19 | 2011-12-19 | Method and system for switching microgrid from island mode to grid connected mode |
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| CN2011104263093A Pending CN102403736A (en) | 2011-12-19 | 2011-12-19 | Method and system for switching microgrid from island mode to grid connected mode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997058A (en) * | 2014-05-08 | 2014-08-20 | 东北大学 | Control method of wind, photovoltaic and storage micro grid system |
| CN111030182A (en) * | 2019-12-27 | 2020-04-17 | 郑州众智科技股份有限公司 | Micro-grid electric energy monitoring system |
| US10965153B2 (en) | 2016-02-05 | 2021-03-30 | Duke Energy Corporation | Methods of microgrid communications and connection transitions |
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| JPS62155731A (en) * | 1985-12-26 | 1987-07-10 | 株式会社明電舎 | Parallel driving method of inverters |
| CN201654170U (en) * | 2010-04-29 | 2010-11-24 | 浙江省电力试验研究院 | Comprehensive micro net experimental system |
| CN102005777A (en) * | 2010-11-04 | 2011-04-06 | 艾默生网络能源有限公司 | Control method and control system for photovoltaic grid-connected inverter |
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2011
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62155731A (en) * | 1985-12-26 | 1987-07-10 | 株式会社明電舎 | Parallel driving method of inverters |
| CN201654170U (en) * | 2010-04-29 | 2010-11-24 | 浙江省电力试验研究院 | Comprehensive micro net experimental system |
| CN102005777A (en) * | 2010-11-04 | 2011-04-06 | 艾默生网络能源有限公司 | Control method and control system for photovoltaic grid-connected inverter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997058A (en) * | 2014-05-08 | 2014-08-20 | 东北大学 | Control method of wind, photovoltaic and storage micro grid system |
| CN103997058B (en) * | 2014-05-08 | 2015-11-04 | 东北大学 | A kind of control method of wind-light storage micro-grid system |
| US10965153B2 (en) | 2016-02-05 | 2021-03-30 | Duke Energy Corporation | Methods of microgrid communications and connection transitions |
| CN111030182A (en) * | 2019-12-27 | 2020-04-17 | 郑州众智科技股份有限公司 | Micro-grid electric energy monitoring system |
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Owner name: CHINA ELECTRIC POWER RESEARCH INSTITUTE BEIJING KE Free format text: FORMER OWNER: CHINA ELECTRIC POWER RESEARCH INSTITUTE BEIJING KEDONG POWER CONTROL SYSTEM CO., LTD. Effective date: 20121129 |
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Effective date of registration: 20121129 Address after: 300010 Tianjin city Hebei District Wujing Road No. 39 Applicant after: Tianjin Electric Power Corp. Applicant after: China Electric Power Research Institute Applicant after: Beijing Kedong Power Control System Co., Ltd. Applicant after: State Grid Corporation of China Address before: 300010 Tianjin city Hebei District Wujing Road No. 39 Applicant before: Tianjin Electric Power Corp. Applicant before: China Electric Power Research Institute Applicant before: Beijing Kedong Power Control System Co., Ltd. |
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Application publication date: 20120404 |