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Distributed power supply grid connection control method

A distributed power supply and control method technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problems that it is difficult to ensure the switching stability of distributed power supply island operation mode and grid-connected operation mode, and achieve the goal of ensuring stable and efficient grid connection Effect

Inactive Publication Date: 2015-11-18
SHANGHAI DIANJI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] There is no recovery control of voltage and frequency in the traditional droop control of distributed power, so it is difficult to ensure the stability of switching between island operation mode and grid-connected operation mode of distributed power

Method used

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  • Distributed power supply grid connection control method
  • Distributed power supply grid connection control method
  • Distributed power supply grid connection control method

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Embodiment Construction

[0026] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] The present invention provides a distributed power grid-connected control method, including:

[0028] Step S1, adjusting the voltage amplitude, frequency and phase of the microgrid according to the grid-connected conditions of distributed power generation;

[0029] Step S2, when the distributed power generation meets the grid-connection conditions, the mode switching controller controls the static switch PCC to close, and completes the grid-connection operation.

[0030] In a preferred embodiment of the distributed power grid-connected control method of the present invention, the distributed power grid-connected operating conditions are:

[0031] E ...

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Abstract

The invention provides a distributed power supply grid connection control method, in which voltage recovery control, frequency recovery control and phase recovery control are added into droop control, thereby realizing the stable transition of a distributed power supply from island operation to grid connection operation, and ensuring the stable and efficient grid connection of the distributed power supply. The grid connection control method can keep the voltage amplitudes, frequencies and phases on two sides of a distributed power supply grid connection switch PCC essentially consistent, furthermore realize the stable transition of the distributed power supply from island operation to grid connection operation, and guarantee the stable and efficient grid connection of the distributed power supply.

Description

technical field [0001] The invention relates to a distributed power grid-connected control technology, and is mainly aimed at the distributed power grid-connected design using power droop control. Background technique [0002] Under the island operation state of the microgrid, the grid connection requirements of distributed power generation are the same as the parallel connection requirements of traditional synchronous generators, and the voltage amplitude, frequency and phase on both sides of the static switch PCC are basically consistent. Seamless switching control uses the distributed power supply mode switching controller to measure the voltage signals on both sides of the static switch, calculate the voltage amplitude difference, frequency difference and phase angle difference, and perform distributed power supply voltage frequency recovery control based on these differences and phase control to realize the smooth switching of distributed power island operation to grid-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/42
Inventor 陈丽娟王致杰
Owner SHANGHAI DIANJI UNIV
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