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电网技术  2015 

抑制直流母线电压波动的四象限级联型变频器前馈控制策略

DOI: 10.13335/j.1000-3673.pst.2015.01.011, PP. 69-75

Keywords: 四象限级联型变频器,功率单元,母线电压波动,瞬时功率平衡,有功电流前馈控制

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Abstract:

四象限级联型变频器功率单元H桥的瞬时输出功率以2倍和4倍频率脉动,使得直流母线产生2次和4次纹波电压。单个功率单元输入端PWM整流器采用前馈控制策略能有效抑制母线电压波动,且总的并网电流无低次谐波。从功率单元的数学模型出发,推导出输入输出的瞬时有功功率,提出了基于瞬时abc理论的瞬时有功电流前馈控制来抑制直流母线电压波动,同时建立了基于Kalman滤波的负载电流估计模型。最后通过功率单元实验测试,验证了控制策略的可行性。

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