Harmonic Suppression Scheme of Inverter Based on 5th and 7th Harmonic Injection Method

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Abstract
As the driving unit of AC motor, frequency conversion device is more and more widely used because of its good energy-saving effect and high speed control accuracy. However, because the circuit topology of the frequency conversion device contains a large number of non-linear switching semiconductor devices, resulting in a large amount of output current, which interferes with the load. Firstly, the mechanism of high-order harmonic generation in frequency converter is analyzed, and the expression of high-order harmonic generation is obtained by mathematical modeling. Secondly, in order to suppress high-order harmonic generation in frequency converter, a harmonic suppression scheme based on specific harmonic injection method is proposed, that is, to inject 5 and 7 harmonic compensation voltage into SPWM sinusoidal signal, so as to reduce the specific harmonic content of output current. The simulation and experiment of MATLAB/Simulink prove that the scheme can effectively reduce the specific sub-high harmonics generated by frequency devices, reduce the harmonic distortion rate and improve the power quality of output current.

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