Filtering method of stationary synchronous compensator (SVG)

Abstract

Disclosed is a filtering method of a stationary synchronous compensator (SVG). According to actual compensation currents output by the SVG in a last cycle, the virtual generation current Iref (i.e., a theoretical sampling value) of a current sampling point is obtained; according to a sampling fluctuation value X allowed by a system under a design requirement, the value range |i-Iref|<=X of the compensation current i of the sampling point is obtained, and the compensation current of the sampling point is filtered according to this. The filtering method provided by the invention, under the condition that a physical filter device is not additionally arranged, realizes front filtering on interference current and greatly reduces the application cost of the invention; through a design of ingenious determine logic, the actual compensation current of the current sampling point can be determined in real time, the front filtering can be rapidly completed, a time delay almost does not exist, and the filtering method has an actual application value; and low pass filtering is then carried out on current signals which are already subjected to the front filtering in the method provided by the invention, such that the filtering effect can be greatly improved.

Description

technical field [0001] The invention relates to a filtering method of 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 reactive power control, and ensure stable, ef...

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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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