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电网技术  2009 

应用于VSC-HVDC输电系统中的新型混合脉宽调制技术

, PP. 7-13

Keywords: 电压源换流器(VSC),高压直流输电,脉宽调制(PWM),特定次谐波消除脉宽调制(SHEPWM),3次谐波注入SPWM,幂和理论

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Abstract:

针对基于两电平电压源换流器(voltagesourceconverter,VSC)的HVDC系统,为实现两电平VSC在获得较优谐波特性的同时,尽可能降低开关频率、提高暂态控制能力,文中提出一种将特定次谐波消除脉宽调制(selectiveharmoniceliminationpulsewidthmodulation,SHEPWM)与3次谐波注入SPWM相结合的混合脉宽调制技术。运用“幂和理论”,提出一种两电平SHEPWM非线性超越方程组求解算法,可显著降低运算量。通过构建稳态控制单元、状态监测器、暂态控制单元与选择器,较好地实现了混合调制的目标。并通过仿真加以验证,结果表明,此混合脉宽调制技术可提高VSC-HVDC工程的效率、可靠性及经济性。

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