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Novel phase modifier and SVG coordinated control method for suppressing transient overvoltage

A technology for coordinated control and camera adjustment, which is used in AC network voltage regulation, flexible AC transmission systems, power transmission AC networks, etc., to reduce the off-grid rate and improve the standby dynamic reactive power capacity.

Pending Publication Date: 2020-09-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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Problems solved by technology

Therefore, the only option is to install a new type of condenser on the side of the rectifier station, and put SVG into each wind farm for on-site compensation

Method used

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  • Novel phase modifier and SVG coordinated control method for suppressing transient overvoltage
  • Novel phase modifier and SVG coordinated control method for suppressing transient overvoltage
  • Novel phase modifier and SVG coordinated control method for suppressing transient overvoltage

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Embodiment Construction

[0023] In order to better understand the present invention, the content of the invention will be described in detail below, explained in conjunction with the accompanying drawings, and a simulation example is given to verify the effect of the present invention.

[0024] Specifically include the following steps:

[0025] Step 1: On the side of the rectifier station, under the steady-state operation condition, the new condenser adopts the constant reactive power operation mode. Let the new condenser take part of the reactive power required for the normal operation of the rectifier station. In order to ensure that the voltage fluctuation of the filter switching bus is not greater than 1%, the new condenser needs to retain a certain static reactive power reserve.

[0026] ΔQ=Q f -(U n ×1%) / k

[0027] In the formula: Q f is the capacity of a single filter; k is the ratio of voltage to reactive power injected into the system, that is, the reactive voltage sensitivity coefficien...

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Abstract

The invention discloses a novel phase modifier and SVG coordinated control method for suppressing transient overvoltage. The method aims to solve the problem that transient overvoltage of a sending end is caused by direct-current commutation failure and locking failure. The method comprises: during steady-state running, optimizing dynamic reactive power reserves of a novel phase modifier and an SVG; and when a fault occurs, according to different situations of commutation failure and locking, switching the working modes of the phase modifier and the SVG, and assisting the switching control ofa filter, wherein especially the SVG control link of introducing voltage-current slope control is used. According to the invention, the transient overvoltage suppression capability is perfected on thebasis of the voltage regulation of the novel phase modifier by controlling the two operating parameters of the SVG, and the ideal coordination control effect is achieved; and with the method, the transient overvoltage of the direct-current transmission sending end under the direct-current transmission commutation failure / locking working condition is effectively suppressed, the good voltage coordination and control capability is achieved, and the off-grid phenomenon of the fan of the direct-current transmission sending end wind power plant due to the transient overvoltage is reduced.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a novel condenser and SVG coordinated control method for suppressing transient overvoltages Background technique [0002] my country's UHV DC sending end is mostly a weak sending end system developed intensively for large-scale new energy such as wind power. Under the circumstances, a large area of ​​new energy will be disconnected from the grid. [0003] As a rotating device, the new condenser can provide short-circuit capacity for the system, and the adjustment ability is not affected by the system. It has unique advantages in providing large-capacity dynamic reactive power support. The new generation of new condensers has been optimized in terms of transient response and overload capacity, and currently has the fastest instantaneous reactive power support speed. However, at present, the new type of condenser has a single model, a large number of supporting equi...

Claims

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Application Information

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IPC IPC(8): H02J3/16H02J3/36H02J3/38
CPCH02J3/16H02J3/36Y02E40/10Y02E40/30Y02E60/60
Inventor 曾贇刘文颖陈仕彬朱丽萍王方雨邵冲张雨薇行舟张尧翔张柏林王维洲徐宏雷吴斌夏鹏韩旭杉张雯程冯永春李潇魏博陈鑫鑫刘克权胡阳王耿郇悦刘紫东杨美颖
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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