方波差频低频谐波抑制控制策略

Suppression control strategies for square-wave difference frequency LF harmonics

针对常规方波差频逆变器存在输出波形低频谐波分量大的问题,提出了一种方波差频低频谐波抑制控制策略.首先对"死区"调制控制策略进行了分析;然后提出了两种降低低次谐波系数的控制策略,并与自然采样频率SPWM调制方式进行了对比;最后利用设计的参数进行了仿真.仿真结果与理论计算值一致,验证了所提方法的正确性.

Considering that the LF harmonic components are greater in the output waveforms of conventional square-wave difference frequency inverter, this paper proposes a suppression control strategy for square-wave difference frequency LF harmonics. At first, the adjustment and control strategies for the dead zone is analyzed, and the two methods of reducing the coefficients of lower harmonics are presented, next, and then, comparison with the natural sampling frequency SPWM modulation is made, and finally, simulation is performed by using the designed parameters. It is shown that this proposed strategy method is of feasibility as the simulation results agree with the theoretical calculations.