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Wind power generation grid-connected system transient state stabilization control method based on automatic current adjustment

A control method and automatic current technology, applied in wind power generation, control systems, control generators, etc., can solve problems such as transient stability evaluation, and achieve the effect of improving transient stability and current output characteristics

Active Publication Date: 2021-10-19
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this document only analyzes the small-disturbance stability of the doubly-fed wind power grid-connected system, and does not further evaluate the stability of the transient state

Method used

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  • Wind power generation grid-connected system transient state stabilization control method based on automatic current adjustment
  • Wind power generation grid-connected system transient state stabilization control method based on automatic current adjustment
  • Wind power generation grid-connected system transient state stabilization control method based on automatic current adjustment

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Embodiment Construction

[0031] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0032] The invention is used to automatically improve the current output characteristics of the wind power grid-connected system, and improve the transient stability of the system during low voltage ride-through. figure 1 It is a schematic diagram of the structure of a full-power wind power grid-connected system connected to the grid, figure 2 It is a schematic diagram of the structure of the doubly-fed wind power grid-connected system connected to the grid, image 3 It is a structural schematic diagram of an adaptive additional q-axis current regulator of the present invention. When a short-circuit fault occurs in the power grid, the current output characteristics of the wind power grid-connected system can be automatically improved by adopting an adaptive additional q-axis current regulator control method, thereby improving the transient s...

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Abstract

The invention discloses a wind power generation grid-connected system transient state stabilization control method based on automatic current adjustment. The method comprises the steps of: converting a three-phase voltage signal of a grid-connected point from a three-phase static coordinate system to a two-phase rotating coordinate system in a power grid voltage d-axis orientation mode if a system enters a low voltage ride-through mode, and obtaining two-phase DC values Usd and Usq; with the usq used as an input signal of a phase-locked loop, calculating the output angular frequency, the output angular frequency deviation and the additional self-adaptive q-axis current adjusting quantity of the phase-locked loop in sequence; calculating d-axis and q-axis output current instruction values of the wind power generation grid-connected system in the low-voltage ride-through period; and sequentially controlling the active and reactive current instruction values in the low-voltage ride-through period, so as to make the wind power generation grid-connected system have a balance point again and successfully realize low voltage ride through. The transient stability of a wind power generation system can be improved only by adaptively changing the control strategy of the q-axis current instruction of the wind power generation grid-connected system.

Description

technical field [0001] The invention relates to a transient stability control method of a wind power grid-connected system based on automatic current adjustment, which can improve the transient stability of the wind power grid-connected system during low-voltage ride-through of the power grid, and make the wind power grid-connected system re-equipped with balance point and successfully achieve low voltage ride through. Background technique [0002] With the continuous development of wind power technology, the capacity of wind power grid-connected systems continues to increase. Due to the reverse distribution of power load and wind energy resources, the wind farm and the grid are in a weak connection state, and the transient stability of the wind power grid-connected system will be seriously threatened under the short-circuit fault of the grid. During the period of low voltage ride through, transient instability is prone to occur, which poses a serious threat to the safe and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/10H02P101/15
CPCH02J3/381H02P9/105H02J2300/28H02P2101/15Y02E10/76
Inventor 姚骏曹俊英陈诗玥黄森裴金鑫罗艺秦振涛
Owner CHONGQING UNIV
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