基于独立分量分析和互信息的多谐波源定位

摘要

In view of the non-fixed relationship between the subharmonic current estimated by ICA and the harmonic source voltage, a multi -harmonic source localization method was proposed, which was based on the independent component analysis ( ICA) algorithm and the mutual information ( MI) theory. The ICA algorithm was applied to esti-mate the harmonic currents generated by the harmonic source. The MI theory could accurately locate multi-harmonic sources according to the relevant information between the estimated harmonic current and bus voltage. To verify the feasibility of this method, PSCAD simulations were made to locate multi-harmonic sources in the IEEE-14 bus sys-tem. The results showed that this approach could accurately locate multi-harmonic sources without knowledge of the network parameters.%针对独立分量分析算法在谐波源定位中估计得到的各次谐波电流与谐波源电压不存在固定的对应关系，提出了一种基于独立分量分析（ ICA)算法和互信息（ MI)理论的多谐波源定位方法。独立分量分析算法用于估计由谐波源产生的谐波电流大小；互信息理论根据估计得到的谐波电流和母线电压之间的相关信息程度，精确确定多谐波源的位置。为了验证此方法的可行性，在PSCAD环境中，对有多个谐波源的IEEE-14母线网络进行了仿真。结果表明，这种方法在对电网参数未知的情况下，能够准确判断出多个谐波源的位置。