用户侧谐波源对PCC谐波水平的影响与区分

按照谐波源定位理论判断的结果,主要谐波源消失后反而可能加剧公共耦合点(PCC)处的谐波水平。从用户侧谐波源对PCC谐波电压、谐波电流的影响着手,提出了助增/助减谐波源的概念,并定义了区分助增/助减谐波源的综合判据,通过算例和IEEE测试系统进行了计算和仿真。所提出的助增/助减谐波源的概念和综合判据弥补了目前谐波定位理论的不足,对谐波治理方案的制订具有重要意义。

Effect of custom harmonic sources on PCC harmonic level

Harmonic pollution is one of the problems of power quality.Considering the point of common coupling(PCC),harmonicsources can exist in both the utility side and the custom side.And the study about harmonic management mostly focuses on thelocalization of harmonic source.This paper derives the condition in which the contributions of custom harmonic sources decrease theharmonic level at PCC.And it testifies the distortion could be worse after the custom harmonic source is eliminated,even if thecustom side is judged as the main pollution source.The definition of strengthening/weakening harmonic source is proposed on thestudy of both voltage and current distortion.An index is suggested to determine whether the custom harmonic sources weaken theharmonic pollution.The result performes on an IEEE industrial test system is reported.The concept and method proposed in thispaper reinforces the harmonic source localization principle.