Enhanced high-speed lower-pass filtering method used for static synchronous compensator

Abstract

The invention relates to an enhanced high-speed lower-pass filtering method used for a static synchronous compensator. According to the actual compensating current output by the SVG in the last cyclic wave, a virtual generation current I<ref> (namely a theoretical sampling value) of a current sampling point is acquired, according to an sampling fluctuating value X capable of being allowed under the design requirements of a system, a value range of the compensating current i of the sampling point is acquired, wherein the absolute value of (i-I<ref>) is smaller than or equal to X, and on the basis of the value range, the compensating current of the sampling point is filtered. According to the enhanced high-speed lower-pass filtering method used for the static synchronous compensator, on the premise that a physical filter is not additionally arranged, pre-filtering of an interference current is achieved, and application cost of the method is greatly reduced. Ingenious judgment logic is designed, real-time judgment of the actual compensating current of the current sampling point is achieved, pre-filtering can be completed rapidly, delay hardly exists, and the filtering method has practical application value. Current signals after pre-filtered with the method are subjected to low-pass filtering, and thus filtering effect can be greatly promoted.

Description

technical field [0001] The invention relates to an enhanced high-speed low-pass filtering method for a static synchronous compensator. Background technique [0002] In recent years, in order to solve the power quality problem of low-voltage distribution network, the power sector has installed reactive power compensation devices in low-voltage distribution network areas. These reactive power compensation devices are mainly based on the principle of dynamic switching of capacitor banks, and there are switching levels. Because the load of the low-voltage distribution network changes greatly, in the case of low load, due to the existence of switching extreme difference, it is impossible to correctly compensate the reactive power deficit in many cases. [0003] Static synchronous compensator (STATCOM-Static Synchronous Compensator, commonly known as SVG in China) can quickly and continuously provide capacitive and inductive reactive power, realize fast voltage and reacti...

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Problems solved by technology

[0006] For the use of the static synchronous compensator, it is necessary to use a filter to filter the compensation current. Using the method adopted by the traditional filter, in order to obtain a better filtering effect, it is at the cost of prolonging the time lag, and the delay is too large to cause current oscillation. Increase, reflected in the current waveform is that the waveform width is obviously wider, which reduces the filtering effect of the filter, thereby reducing the power quality of the low-voltage distribution network

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