三相PWM变流器谐波阻抗的研究

Research on the Harmonic Impedance of Three-phase PWM Converter

变流器的谐波阻抗是系统稳定性分析、滤波器优化设计中的重要参数。以典型的三相PWM逆变器为例,研究了三相PWM逆变器在abc坐标系下与dq坐标系下的输出阻抗模型,并采用谐波电流注入法,对逆变器的输出阻抗进行测量,从而得到三相P W M变流器的谐波阻抗参数。采用仿真实验对理论分析进行了验证。

Harmonic impedance is a key parameter used to analyze the stability of system, optimized design of filter, and so developed an output impedance model in abc coordinates and dq coordinates as an example of a typical three-phase PWM inverter. Output impedance of the inverter was extracted and measured by injecting a current perturbation and the parameter of harmonic impedance was got. Simulation results validate the theoretical analysis.