三电平VSC-HVDC系统谐波间谐波产生机理分析

摘要

In order to analyze the transfer behavior and the interaction of harmonics and interharmonics generated in the voltage source converter based high voltage direct current(VSC-HVDC)system,and considering a three-level VSC-HVDC system with pulse-width modulation(PWM)control,the generation mechanism of harmonics and interharmon?ics in both AC and DC sides is analyzed theoretically together with mathematical formulations,where Fourier analysis of switching function is also combined. Based on Matlab/Simulink,a model of three-level VSC-HVDC system with PWM control is established. The results of simulation verify the correctness of the mathematical model ,which provides a theoretical basis for the measurement and suppression of harmonics and interharmonics.%为分析电压源型高压直流输电系统谐波、间谐波的传递行为和相互影响,本文针对三电平脉宽调制控制电压源型高压直流输电系统,结合开关函数的傅里叶分析,对三电平变流器交流侧和直流侧的谐波、间谐波产生机理进行了详细的理论分析和数学推导.基于Matlab/Simulink搭建了三电平脉宽调制控制电压源型高压直流输电系统模型,数字仿真结果验证了数学模型的正确性,为谐波、间谐波的测量和治理提供了理论依据.