双Buck交流斩波器抑制电网低次谐波的研究

Research on Restraining the Low Frequency Harmonic in Power Grid Introduced by Double Buck AC Chopper

针对双Buck交流斩波器电网引入的低次谐波问题,对其调制方式及调制函数与输出的关系进行定量分析,对PWM高频调制函数进行低次谐波补偿,构成带谐波补偿的调制函数,在Matlab/Simulink环境下进行相应的仿真,验证了采用谐波补偿的调制方式能够很好的解决由于电网引入的低次谐波问题。

Against the low frequency harmonic introduced into in the power grid by double buck ac chopper,the modulation mode of the low frequency harmonic and the relation between the modulation function and the output are analyzed in this paper. Based on the analysis,the PWM high frequency modulation function is compensated for low frequency harmonic and a modulation with harmonic compensation is then build which is validated by simulations with Matlab / Simulink to confirm that the modulation function with harmonic compensation can solve the problem of the low frequency harmonic introduced in the power grid.