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中文摘要：
根据自感知执行器的工作原理,利用一只变压器完成谐波检测和抑制两种功能,处于正常工作状态时可实现谐波抑制,处于非正常工作状态时不致放大谐波。首先对工频信号进行数字采样,再利用自相关函数法结合递推最小二乘估计工频信号的频率,再根据该频率产生反向抑制谐波,来抑制当前谐波。为实时调整各次反向抑制谐波的权重,根据当前时刻的谐波抑制的结果,采取最小均方自适应算法来更新权重。模拟试验表明,该调谐滤波器具有良好的控制特性。
英文摘要：
According to the principle of self-sensing actuators, a novel method measuring and suppressing harmonics was proposed. This approach could not only guarantee the performance in suppressing harmonics at normal operation state, but also ensure not to amplify harmonics in case of malfunctioning. Firstly, harmonic power signal was sampled, and then its frequency was estimated with autocorrelation function method and further improved with RLS algorithm. Based on the estimated value of frequency, an inverted suppression harmonic signal is generated to offset original harmonic. To update the weights of each harmonic offset signal in real-time, with the knowledge of last moment offset error, an adaptive algorithm LMS is employed. The experimental results show that the proposed filter has good command of control.
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