Method and system for switching microgrid from island mode to grid connected mode
A mode switching and island mode technology, applied in flexible AC transmission system, single grid parallel feeding arrangement, sustainable manufacturing/processing, etc., can solve the problem of long switching time, power outage of load, and difficulty in meeting the requirements of rapid response of microgrid system etc. to achieve the effect of improving controllability and reducing transient transition time
Inactive Publication Date: 2012-04-04
STATE GRID TIANJIN ELECTRIC POWER +3
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[0003] The present invention provides a method and system for switching a micro-grid from an island mode to a grid-connected mode, aiming to solve many unreasonable problems in the method for switching a micro-grid system from an island mode to a grid-connected mode provided by the prior art The switching time is long, the load will have intermittent power outages, and it is difficult to meet the safety, reliability and rapid response requirements of the microgrid system.
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[0016] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the invention.
[0017] figure 1 It shows the implementation flow of the method for switching the microgrid from the island mode to the grid-connected mode provided by the embodiment of the present invention.
[0018] The method includes the following steps:
[0019] In step S101, the threshold voltage U1 for switching the microgrid system from the island mode to the grid-connected mode is set;
[0020] In step S102, the external grid voltage U2 connected to the microgrid system is monitored in real time;
[0021] In step S103, according to the relationship between the external grid voltage U2 and the threshold volt...
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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 [0001] The invention belongs to the field of distribution network dispatching and management, and in particular relates to a method and system for switching a microgrid from an island mode to a grid-connected mode. Background technique [0002] When the micro-grid system is in the island operation mode, when the external power grid returns to normal or when the micro-grid needs to be connected to the grid according to the situation, the micro-grid system should quickly switch to the grid-connected operation mode, while the existing micro-grid system switches from the island mode to the grid-connected operation mode. The grid-connected mode is unreasonable, such as long switching time, intermittent power outages of the load, and it is difficult to meet the requirements of safety, reliability and rapid response of the micro-grid system. Contents of the invention [0003] The present invention provides a method and system for switching a micro-grid from an isl...
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IPC IPC(8): H02J3/38
CPCY02E40/10Y02P80/14
Inventor 杨宇全杨磊赵丽文林昌年王庆平张鹏潘正魁迟福建
Owner STATE GRID TIANJIN ELECTRIC POWER