【正文】 在三相六開關并聯(lián)型APF的SVPWM調制算法的研究基礎上，將SVPWM調制算法擴展到三相四開關系統(tǒng)，提出了用于三相四開關并聯(lián)型APF輸出電流控制的SVPWM調制算法。所以，四開關三相逆變器的輸出能力要相對弱一些。A、B兩相功率開關器件的控制規(guī)律相同，現(xiàn)以A相為例來說明。 四開關組成的電路既可以用于整流也可以用于逆變，本文主要介紹三相四開關逆變器，濾波器。關鍵詞三相四開關；SPWM變換器；整流器；逆變器；濾波器AbstractPower electronic technology appeared in the 1950 s and in 1957 the general electric pany on the basis of the transistor developed the first thyristor and then was called SCR silicon controlled rectifier, (SCR). The thyristor is a use of semiconductor PN junction principle development of a solid controllable switch, he can use small current control switch conduction, so as to control high voltage large current circuit.With the rapid development of the power electronic technology, all kinds of high power switch device to a wide range of applications. They hand to power transformation application convenience, on the other hand, to the power system brought heavy reactive control and harmonic management problem. Power electronic technology is widely used four switch. Power electronic technology is the study of the form of electrical energy transformation technology, they transform the basic types of exchangea: dc, dcdc, dcmunication and exchangemunication transform.