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级联型变流器直流母线空载振荡分析与环路优化设计

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Keywords: 移相全桥直-直变换器,级联式变换器,平均电流控制,低频脉动,空载,电压环增益

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Abstract:

针对两级式静止变流器空载时出现直流母线低频振荡的问题开展研究。基于前级直-直变换器在电流连续(CCM)和电流断续(DCM)状态的小信号模型,分析了CCM和DCM状态下开环系统参数与补偿网络对于系统稳定性的影响,利用Matlab仿真软件绘制系统幅相曲线,揭示了级联型变换器直流母线电压在空载状态下低频振荡产生的原因及其与环路参数的关系。针对后级逆变器空载以及轻载状态,兼顾CCM状态的稳定性和动态性研究分析了前级直-直变换器电路参数和补偿网络设计规则,通过Saber仿真验证了设计规则的有效性。最后在4kV·A航空静止变流器实验平台上进行了实验验证,给出了相应的动态和稳态实验波形,表明了分析结果正确性和所提方法有效性。

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