非正弦电路功率因数改善

On improvement of non-sinusoidal circuit power factors

从非正弦电路功率因数的概念出发,阐述了改善非正弦电路功率因数的优点,可以减少电网无功功率的流动,提高电压质量,降低损耗,增加变压器及输电网载供能力。分析了无功补偿与谐波抑制的现状,指出电力电子技术与无功补偿、高次谐波抑制是紧密相联的,对无源滤波技术与有源滤波技术的优劣进行了分析,对基于电力电子技术的有源功率因数校正器的工作机理和系统构成作了简单介绍。从无功功率补偿和谐波抑制以及单位功率因数变流器方面介绍了国内外改善非正弦电路功率因数的一些新技术和发展动向。

In th is paper, the concepts of non - sinusoidal circuit power factor are reviewed. It is pointed out that the benefits of non - sinusoidal circuit power factor improvement, such as reducing the flow of the power system vat power, improving the power quality, reducing losses, increasing the capability of transformer and power transmission network＇s loading supply. It is pointed out that the status of vat compensation is tightly dependent upon the harmonic suppression ; the paper analyses the advantages and disadvantages of passive power filter technology and active power filter technology. The system forming and working principals of active power filter of APFC based power electronics are discussed in this paper. The state - of - the - art technology and new trends for overcoming these problems are introduced.