The Research Of Parallel Three-phase Four-wire Active Power Filter

With the rapid development of power electronics technology, the power electronicsequipment has realized the high frequency and miniaturization, especially for high powerswitch devices have been researched and application to power electronic devices.Theelectrical properties are improved, however it produce higher harmonic not only to power gridcaused serious pollution, but also to electric equipment caused great damage.At present, thepower electronics equipment has become the most important harmonic source for the powergrid.Have set standards at home and abroad, thus the power grid strictly the harmonic currentsand harmonic voltage limit within permitted. In order to restrain and reduce the pollution ofharmonic wave to power grid, improve the quality of power transmission and ensure thenormal operation of the power equipment.In order to control the harmonic pollution of thepower electronics equipment, except for research and development of high power factorrectifier net side,the effective way is to use filter unit filter harmonic sources of a harmonic.This paper is based on three line four wire parallel the voltage type active power filtertopology structure as the research object, firstly introduces the basic principle of active powerfilter, main circuit structure types and topology, then analyses the key technology of activepower filter, including harmonic current detection and compensation strategy, and selected theadaptive harmonic detection as this paper test methods, control strategy in the selection of thepoor take control to compensate for harmonic current, and take control of the error to join PIDlink, make compensation plan to be more perfect. Finally in MATLAB to three line under fourwire of active power filter on the principle of the simulation, through the experiment data, andverifies the feasibility of the scheme.