双馈发电网侧变换器的电网电压定向控制方法的研究

摘要

建立了三相电压型PWM变换器的数学模型,详细分析了PWM变换器电网电压定向控制的两种实现方式,并重点根据电网电压和线电压间的矢量关系,确定了双馈发电励磁系统网侧PWM变换器电网电压定向的实现方法.以TMS320F2812为主控制芯片,搭建了三相电压型PWM变换器控制实验所需的平台,设计了过零比较电路和相应的软件实现程序.实验结果验证了该电网电压定向控制方法的有效性和可行性.%A mathematical model of three-phases voltage PWM converter was established, two implementation methods of grid voltage orientation control of PWM converter were analyzed in details. According to vector relation of grid voltage and line voltage, an implementation method of grid voltage orientation of grid side PWM converter of doubly-fed power excitation system was determined. An experimental platform of three-phase voltage PWM converter was built by taking TMS320F2812 as main control chip, and zero-crossing comparator and software were designed. The experimental result indicated that the control method is correct and valid.