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电网技术  2012 

背靠背双PWM变流器的协调控制策略

, PP. 146-152

Keywords: 双脉宽调制变流器,电压源型变流器,双环控制,解耦控制

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Abstract:

由于双PWM变流器可同时实现多种控制功能,因此其在可再生能源和电力系统中的应用越来越广泛。本文以背靠背双PWM变流器为研究对象,首先建立了其动态数学模型,接着从实现其多种控制功能的角度出发,设计了其构成VSC的双闭环控制器结构,并基于所建立电压源型变流器的d-q同步旋转坐标数学模型,研究了双闭环控制中用于实现VSC输出电流解耦控制的内环控制策略,以及用于实现VSC直流电压恒定、交流电压跟踪和功率四象限动态调节的多种外环控制策略。最后通过数字仿真,不仅考察了双PWM变流器中两个VSC实现不同外环控制策略的动态协调响应特性,而且仿真结果同时验证了所研究控制策略的可行性。

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