苗德根;侯世英;王永胜;廖磊;孙韬;

• 1:输配电装备及系统安全与新技术国家重点实验室(重庆大学)

摘要(Abstract)：

前馈控制能够预测输出随扰动变化的规律,使输出偏差产生之前即被纠正,将其应用于恒压恒频逆变器可以抑制负载电流对输出电压的影响。比例微分前馈能够完全补偿基于模拟电路控制的逆变器负载电流扰动,使之获得良好的输出电压波形,然而,在基于数字电路控制的恒压恒频逆变器中,比例微分前馈不能纠正负载电流谐波通过控制延时环节产生的输出电压谐波,甚至放大该谐波,恶化输出电能质量。以单相LC滤波的恒压恒频逆变器为研究对象,建立了数字电路控制的逆变器s域模型,揭示了逆变器带非线性负载输出电压总谐波畸变率升高的机理,从阻抗模型的角度分析了比例微分前馈控制造成谐波放大的原因,据此提出了基于多谐振控制器的前馈策略,并给出前馈环节参数设计方法。实验结果验证了所提改进前馈策略的可行性,以及在抑制输出电压谐波方面的优越性。

关键词(KeyWords)： 恒压恒频逆变器;谐波抑制;前馈;比例微分;谐振控制器;数字控制

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 苗德根;侯世英;王永胜;廖磊;孙韬;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.0778

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