电力牵引系统的预测型谐波电流检测方法研究

准确、快速地检测系统电流中的谐波成分，是保证有源电力滤波器(APF)具备良好工作性能的关键。针对电力牵引负荷的经常性和剧烈变化的特点，提出了一种预测型谐波电流实时检测方法，能够在任一时刻正确预测出未来时刻的谐波电流值。理论分析和仿真研究表明，该方法检测误差小，并能克服低通滤波器造成的延时，使APF的控制时滞大大减少。该方法也可用于一般非线性负载的谐波电流检测。

Research on Detection Method of Harmonic Current in Electric Traction Systems

It is very important for detecting harmonic component s of system current fast and precisely.It is surely good at the performance of a n active power filter(APF).A predictive real-time harmonic detection method aim ing at electric traction load is presented,which is used in the APF of electrica l railway.The harmonic value of next time can be predicted by using this method in spite of the acute characteristic of traction load.The theoretical analysis a nd simulation results show that the proposed method can reduce the time delay pr oduced by low pass filters in APF.The method can be also used for detecting harm onic currents of other non-linear loads.