midfrequency meaning in Chinese

中心频率

Secondly , according to the character of this kind of harmonic , the solutions of power filter are deeply analyzed and an optimized topology for series connected hybrid power filter is obtained . by pwm technique , midfrequency transformer and the principle of the magnetomotive force ( mmf ) compensation , the problem to the transfer of the low - frequency harmonic power compensatory signal in the series apf is solved , in technique
其次，针对acem系统特有的“电源谐波”特性，深入分析了滤波器方案，得到了一种适用于acem系统谐波抑制的串联混合型有源电力滤波器优化拓扑结构，并采用了pwm调制技术、中频注入变压器和磁势补偿原理有效地解决了串联apf中低频谐波功率补偿信号传输的难题。