基于电网电压补偿的多电平变频器控制方法研究

提出了一种基于电网电压补偿的多电平变频器控制方法，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。并给出了适合数字信号处理的采样原理和采样时序。直接根据电网电压的变化，实时调节输出电压，能获得与闭环系统相媲美的理想机械特性和运行效果。该方法不仅具有计算步骤简单、输出SPWM对称性好、精度高和控制方便的特点，而且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。

Research on Control Method for Multilevel Converter Based on Power Compensation of Network Voltage

In this paper, a new method for multilevel converter based on the compensation of power network voltage is proposed From the structure of mainloop begin, according to the basic regular sample theorem of lowvoltage converter, some detailed processes for theory analyzing and algorithm deducing is introduced which was propitious to multilevel converter in order to make it used to digital signal process, sample theorem and sample time sequence are also proposed It would acquired ideal mechanical character and run result just as closed loop system if adjust the output voltage very quickly to the variety of network voltage The method not only has great advantages such as simple calculation, high preponderance in the symmetry of SPWM output wave, high precision and very convenience in control,but also it is applicable for any number of levels we can draw a conclusion that it has practical value for multilevel converter