基于特定次谐波注入法的变频装置谐波抑制研究

变频装置作为目前广泛采用的一种节能驱动电路,因其调速性能良好,在工业领域特别是机床和机器人自动控制方面得到了广泛应用。变频装置由非线性开关半导体元件构成,引起输出电流含有多次谐波,而常规变频器并未对谐波进行抑制。针对变频器产生的高次谐波,提出一种在SPWM正弦信号中注入高次谐波补偿信号的方法,从而对特定次谐波进行抑制。通过MATLAB/Simulink仿真和实验验证此方法能够降有效去除特定次谐波,降低谐波畸变率,提高输出电流电能质量。

Research on Harmonic Suppression of Frequency Converter Based on Specific Subharmonic Injection Method

As an energy-saving driving circuit widely used at present, frequency conversion device has been widely used in industrial field, especially in machine tool and robot control, because of its good speed regulation performance. Frequency converter is composed of non-linear switching semiconductor elements, which cause multiple harmonics in the output current, while conventional converters do not suppress harmonics. A method of injecting high-order harmonic compensation signal into SPWM sinusoidal signal was proposed to suppress specific sub-harmonics. The MATLAB/Simulink simulation and experiment show that the proposed method can be used to effectively reduce the specific sub-harmonics, reduce the harmonic distortion rate and improve the output current power quality.