Method for eliminating and controlling SVC specific times harmonic advanced research and apparatus realizing the same

Abstract

The invention discloses an SVC selected harmonic number prediction elimination control method and the devices for implementing thereof. The invention predicts the harmonic numbers of 2, 5, 7, 11 and 13 of the SVC system by adopting an adaptive control algorithm which is based on fuzzy prediction; the prediction result is used for modifying the PWM output, which is controlled by load current feedforward, of an injection-typed active filter HAPF; the HAPF outputs the harmonic current which is identical to the SVC selected harmonic time current and has reverse phase, thus reaching the objects of harmonic filtering, improving the dynamic performance of the device and improving the stability of the system. The invention implements the optimum control to power network reactive and power factor, provides a plurality of dynamic reactive storage for the power system, has an important effect in stabilizing the voltage of the generatrix and compensating the reactive power of the distribution network, and effectively improves the transmission capacity of the power system.

Description

technical field [0001] The invention relates to the core technology of a static var compensator and a hybrid injection active filter in a power system, in particular a SVC specific-order harmonic prediction and elimination control method and a realization device thereof. Background technique [0002] Since the 1970s, due to the rapid development of power electronic technology, various power electronic converters have been widely used in power systems, industries, transportation and households, and the harmonic pollution in the power grid has become more and more serious; at the same time, due to most The power factor of the power electronic device is very low, which also greatly reduces the power supply quality of the grid. Therefore, eliminating harmonic pollution and improving power factor have become major issues in current power operation and production departments. Active filter and reactive power compensation device is a new generation of power products belonging to f...

AI Technical Summary

Problems solved by technology

The traditional SVC filter device uses a set of passive filter (PPF) groups, which has a simple structure, low cost, and mature technology. But its biggest disadvantage is that the filtering characteristics are affected by the impedance of the grid, and the grid and filter may occur. The series and parallel resonance between devices cannot realize dynamic compensation for harmonics, and the effective material consumption is large and the volume is large

However, the joint operation of SVC and HAPF is rarely involved in research and engineering applications, and no one has proposed a solution involving the suppression of specific harmonics emitted by SVC by HAPF

The difficulty of its technology is to solve the contradiction between the HAPF filtering effect and the system dynamic performance, and how to realize the coordinated control of SVC and HAPF, avoid the interactive influence between the two controllers, and improve the system performance and stability

Images