基于电网电压补偿的多电平变频器控制

为了改善电网电压补偿效果，从主回路拓扑结构出发，以低压变频器规则采样法为基本理论，详细介绍了适合于多电平变频器控制的理论分析和算法推导过程，提出了一种基于电网电压补偿的多电平变频器控制方法，并给出了适合数字信号处理的采样原理和采样时序。根据电网电压的变化，实时调节输出电压，获得与闭环系统相同的理想机械特性和运行效果。该方法具有计算步骤简单、输出SPWM对称性好、精度高和控制方便的特点，适用于任何电平数目及拓扑结构。试验结果表明，和其他多电平控制方法相比，使用效果好，有很高的利用价值。

Control method for multilevel converters based on power compensation of network voltage

In order to improve the compensation effect of power network voltage a new method for multilevel converters based on the compensation of power network voltage is proposed.The article begin with the structure of main-loop and takes the regular sample theorem of low-voltage converter as the basic theory.Then it introduces the theory analyzing and algorithm deducing process in detail which is propitious to multilevel converter control.Sample theorem and sample time which are applied in digital process are also proposed.In order to acquire ideal mechanical character and running performance as closed loop,it regulates output voltage at times according to the variety of the voltage of power network.The method not only has great advantages such as simple calculation,high preponderance in the symmetry of SPWM output wave,high precision and convenience in control,but also it is applicable for any number of levels and structure.The results show that it has practical value for multilevel converter compared with other methods.