SVG aging test method and its device

Abstract

The invention discloses an SVG aging test method and apparatus. The SVG aging test method and apparatus are characterized in that the output current cross feedback of two SVGs are used as the command current of the opposite party to enable the output reactive power of SVGs to be automatically alternated and improved by multi levels and to be mutually offset in real time, thus satisfying the requirement that multi groups of SVGs can perform aging tests at the same time and improving the aging test efficiency; when the SVGs are aged normally or during the aging process of the SVGs, once some SVGs fail, the output total reactive power can always approach to 0 in real time, thus reducing the influence of the aging test on the quality of power grid; and when the aging test platform is invested or withdrawn from the SVGs, the aging tests of other SVGs can be carried out normally when the whole aging test platform is not adjusted, thus being convenient for operation.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an SVG aging test method and a device thereof. Background technique [0002] In the power supply system, the use of reactive power compensation devices can improve the power factor of the grid, thereby reducing the loss of power supply transformers and transmission lines, improving the power supply environment, and improving the power quality of the grid; SVG (static var generator) can both compensate It can filter out harmonics and suppress three-phase unbalance, so it is a reactive power compensation device that is widely used at present. In order to ensure the stable and reliable operation of the SVG device, an aging test will be carried out before leaving the factory. The key to building an aging test platform is to avoid the problem of reducing the power factor of the grid caused by outputting a large amount of reactive power during the aging test. With the massive ...

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Problems solved by technology

[0004] The aging method of SVG with power frequency reactor load and sending part of inductive reactive power to the grid cannot meet the aging test of SVG with a higher power level under the limitation of the rated capacity of the power grid in the factory and the reactive load.

The method of the patent CN103487675A "An Aging Experimental System for a Static Dynamic Var Regulator" can solve the problem of SVG rated power aging under the condition that the capacity of the power grid in the factory and the reactive load current are limited, but according to the switchgear The process of adjusting the current value of the reactive current sent by the two SVGs needs to be completed by a third party such as human adjustment or software module adjustment; and in the aging test of the SVG, the output current of the two SVGs is based on the switchgear current rather than the other side. Therefore, one of the SVGs fails, and the other SVG continues to emit reactive power, generating reactive power greater than the rated capacity of the plant, which affects the power factor of the power grid.

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