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Microgrid seamless switching control method based on improving phase control under peer mode

A phase control and control method technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems of large current impact, control mode switching and operation mode switching out of synchronization, etc., to reduce power impact and flexibly connect input effect

Active Publication Date: 2014-12-03
GUANGXI POWER GRID CORP +1
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Problems solved by technology

Therefore, when it performs seamless switching control, the main power supply needs to be switched from voltage frequency control when off-grid to PQ control when grid-connected. Since the control mode switching and operating mode switching are not synchronized, large currents are prone to occur at the moment of grid connection shock

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  • Microgrid seamless switching control method based on improving phase control under peer mode
  • Microgrid seamless switching control method based on improving phase control under peer mode
  • Microgrid seamless switching control method based on improving phase control under peer mode

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Embodiment Construction

[0025] The technical scheme of the application of the present invention will be further described below through the accompanying drawings and embodiments.

[0026] A typical microgrid system structure is as follows: figure 1 As shown, the wind power generation system, photovoltaic power generation system, and energy storage system in the microgrid convert renewable energy into power frequency AC power through their respective inverters, and then connect to the unified microgrid AC bus through feeders. Among them, all micro-grid inverters used for energy storage and grid-connection adopt drooping control strategies, which are responsible for providing voltage and frequency references for the independent operation of the micro-grid, and realize the reasonable distribution of active and reactive power output; wind power and photovoltaic power generation systems The inverter adopts current control to track the maximum output of wind turbines and photovoltaic cells in real time, so...

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Abstract

The invention discloses a microgrid seamless switching control method based on improving phase control under a peer mode, and belongs to the technical field of a distributed power generation microgrid. According to the method, through utilization of a characteristic that a distributed power supply is always controlled by voltage under the grid-connected operation mode and the independent operation mode, the switch from the microgrid grid-connected operation mode to an off-grid operation mode is achieved conveniently, meanwhile, power rush at the moment of switching the off-grid operation to the grid-connected operation is reduced by the voltage\frequency restorative control of a second layer and the improved phase angle control. Not only is flexible access of the distributed power supply in the microgrid achieved, but also the function of plug and play of the whole microgrid is achieved.

Description

technical field [0001] The invention relates to the technical field of distributed power generation microgrids, in particular to a microgrid seamless switching control method based on improved phase control in a peer-to-peer mode. Background technique [0002] Renewable energy such as solar energy and wind energy will gradually become an important part of the future world energy structure due to its advantages of non-polluting, renewable, and wide distribution. The access technology of renewable energy has also attracted more and more attention from various research institutions at home and abroad. As one of the important forms of renewable energy access to the grid, microgrid refers to a small power generation system arranged on the user side with a power generation of several thousand watts to 50 megawatts. A microgrid generally includes distributed power sources, energy storage devices, energy conversion devices, loads, monitoring and protection devices, etc. A microgri...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 陈卫东王成山高立克郭力孙艺敏黄秀琼奉斌杨艺云
Owner GUANGXI POWER GRID CORP
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