针对已有滤波器对大型冶炼企业谐波治理效果不理想的情况,提出一种新颖的有源电力滤波器(APF)——单独注入式APF。该滤波器把串联谐振注入型APF和并联混合型APF结合在一起,在有效滤除谐波的同时还可提供一定容量的基波无功功率补偿。实践表明,所提出的单独注入式APF不仅具有较大容量的无功补偿能力,且APF逆变器容量较小,因而工程应用价值较高。 Aiming at the situation that the existing filter is not ideal for the harmonic control of large-scale smelting enterprises, a novel active power filter (APF) -single injection APF is proposed. The filter combines series resonant injection type APF with parallel hybrid APF to provide a certain amount of fundamental reactive power compensation while effectively filtering out harmonics. Practice shows that the proposed single-injection APF not only has a large capacity of reactive power compensation capability, and APF inverter capacity is small, so the engineering application of higher value.