关键词: 无功补偿, PWM, 功率因数

Abstract:

With the development of modern industry,more and more industrial electrical equipment with low power factor are connected to the power grid,which puts forward higher requirements for the stability of the power gird and the voltage quality.Based on the principle of reactive power compensation,this paper research and design a reactive power compensation devices of continuously varying capacitance with the principle of PWM.The compensator overcome the traditional device's disadvantage that use perceptual reactive cover capacitive reactive to produce adjustable capacitive reactiveand improve the status that existing reactive power compensation devices can only cast slice grouping-and-grading and don't have the ability of continuously varying capacitance of capacitors,it can track the load variation quickly,compensate the reactive power in real time,stable the voltage of power grid,and increase the power factor.

Key words: var compensator;PWM;power factor