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宽电压范围高速低压发电机交直变换器的平均电流控制策略

, PP. 19-26

Keywords: 高速发电机,双管Buck-Boost变换器,低频小信号模型,平均电流控制

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Abstract:

基于双管Buck-Boost变换器,提出一种高速低压发电机交直变换器的平均电流控制策略。高速低压发电机的输出电压宽,低频电压纹波大,难以直接应用于低压直流供电系统,需要对发电机的输出电压进行稳压变换。同极性的双管Buck-Boost变换器适用于宽电压范围输入场合。基于平均开关模型,建立双管Buck-Boost变换器同步工作模式的非理想低频小信号模型,推导关键的传递函数,分析输入参数变化、负载变化以及右半平面零点对控制环路稳定性的影响,提出高稳定性和低输出纹波的宽输入电压平均电流控制策略。通过SABER仿真软件,验证宽电压输入双管Buck-Boost变换器平均电流控制的可行性,设计一台10倍输入电压变化范围的原理样机并进行实验测试,验证了所提出控制策略的可靠性和有效性。

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