A three-phase four-switch active power filter and its control method

Abstract

The invention discloses a three-phase four-switch active electric power filter and a control method thereof. The active electric power filter comprises an inverter. The inverter comprises two switch arms and a DC capacitive branch. The two switch arms and the DC capacitive branch are connected in parallel. The two switch arms are respectively composed of two power switches which are connected in series. The inverter is parallelly connected between a three-phase electric network and a three-phase load through an output wave filter. The control method is an increment type PID control method based on a two-dimensional subordinated cloud model. The two-dimensional subordinated cloud module is utilized for performing on-line adjustment on proportion coefficient, integral coefficient and differential coefficient of an increment type PID controller, thereby improving response performance of a control system. The three-phase four-switch active electric power filter can perform dynamic real-time treatment on each sub-harmonic current and wattless current, thereby greatly improving compensation performance of the system, saving cost, and realizing higher engineering practicability.

Description

technical field [0001] The invention relates to a power filter and a control method, in particular to a three-phase four-switch active power filter device and its incremental PID control method based on a two-dimensional subordinate cloud model. Background technique [0002] Electric energy is an indispensable and important energy source in modern society. The sustainable development of electric power has become the basis for realizing the sustainable development of society and economy, and plays an important balancing role in the coordinated development of society, economy, energy and environment. In recent years, with the increasing number of nonlinear loads such as rectifiers, frequency converters, and electrified railways in the distribution network, power quality problems such as current waveform distortion, voltage fluctuation, and three-phase imbalance have become increasingly serious. How to make full use of the characteristics of active power filters to dynamically ...

AI Technical Summary

Problems solved by technology

[0004] In the traditional control theory of active power filter, the control theory of linear system is relatively mature, and there are certain methods for dealing with nonlinear system, but the effect is still unsatisfactory, and the method is relatively complicated

For control models that are fuzzy or have serious uncertainties, traditional control methods are difficult to control them

Moreover, due to the delay of sampling and calculation, and other reasons, there must be an error between the current sent by the APF and the required compensation current

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