Low voltage ride-through system

A low-voltage ride-through and main control system technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problem of adjusting for a long period of time

Inactive Publication Date: 2014-07-30
SHANGHAI DIANJI UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to provide a low-voltage ride-through system to solve the problem of low-voltage ride-through in the prior art when the operating voltage of the power grid is too low and the short-circuit protection of the rotor side is cut off. Overspeed operation, when the grid voltage recovers, cut off the short-circuit protection circuit connected to the rotor side, when the converter resumes work, it needs to be adjusted for a long period of time to restore the normal operation of the grid

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[0024] The low voltage ride through system proposed by the present invention will be further described in detail below with reference to the drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0025] Please refer to figure 1 , which is a flow chart of the low voltage ride through system in an embodiment of the present invention. like figure 1 As shown, the low voltage ride through system includes: double-fed asynchronous generator 100, converter 200, main control system module 300, low voltage ride through module 400, and yaw system 500; the main control system module 300 receiving the working status information of the doubly-fed asynchronous generator 100 and the con...

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Abstract

The invention provides a low voltage ride-through system. A master control system module receives work status information of a doubly fed induction generator and a converter connected with the doubly fed induction generator; the master control system module sends a trigger command or an end command to a low voltage ride-through module; a yaw system receives a first control signal sent by the master control system module and a second control signal sent by the low voltage ride-through module and adjusts the work status of the doubly fed induction generator, so that the problems that operating voltage of a power grid in the prior art is too low and low voltage ride-through is needed, and when the converter is cut off and rotor side short circuit protection circuit is connected, the rotor of the doubly fed induction generator overspeeds are solved; when the voltage of the power grid recovers, the rotor side short circuit protection circuit is cut off, and when the converter returns to work, normal working of the power grid is recovered after a long time of adjustment.

Description

technical field [0001] The invention relates to the field of grid-connected power generation, in particular to a low-voltage ride-through system. Background technique [0002] With the development of human society, energy and environmental issues have become problems that must be solved for human survival and development; Among them, wind power and photovoltaics are currently the renewable energy that people pay more attention to. They are not only clean and environmentally friendly, but also inexhaustible. In recent years, photovoltaic grid-connected power generation systems and wind power grid-connected power generation systems have gradually emerged in various places. After grid connection, the stability of wind power generation system and photovoltaic power generation system is a difficult problem that must be solved in grid connection. The randomness and instability of power generation may bring unfavorable factors to the safe and stable operation of the grid, and the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 尹万杰高桂革曾宪文肖浩袁靖王晖杨凤惠余成龙李健
Owner SHANGHAI DIANJI UNIV
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