刘波峰,候维杨,李诚明.MMC子模块电容电压检测新方法[J].电子测量与仪器学报,2017,31(7):1137-1143
MMC子模块电容电压检测新方法
New sub module voltage measuring technique in modular multilevel converter
  
DOI:10.13382/j.jemi.2017.07.021
中文关键词:  模块化多电平变流器  电压传感器减少  电压观测器  电压补偿
英文关键词:modular multilevel converter  voltage sensors reduction  capacitor voltage estimator  voltage compensation
基金项目:国家国际合作专项(2011DFA62240)资助
作者单位
刘波峰 湖南大学电气与信息工程学院长沙410082 
候维杨 湖南大学电气与信息工程学院长沙410082 
李诚明 湖南大学电气与信息工程学院长沙410082 
AuthorInstitution
Liu Bofeng School of Electrical and Information Engineering, Hunan University, Changsha 410082, China 
Hou Weiyang School of Electrical and Information Engineering, Hunan University, Changsha 410082, China 
Li Chengming School of Electrical and Information Engineering, Hunan University, Changsha 410082, China 
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中文摘要:
      传统模块化多电平换流器(modular multilevel converter, MMC)子模块电容电压检测方法需要与子模块数相同的电压传感器,存在传感器数量大、采集信息工作量大的问题,提出了一种基于最近电平逼近调制MMC子模块电压检测的新方法,对桥臂子模块进行分组,每组采用一个电压传感器进行检测,通过检测电压对电容电压观测器的观测值进行校正,得到每个时刻电容电压值,提出提高电容电压复位校正次数的方法。针对硬件电压采样电路带宽限制影响桥臂输出阶梯波电压测量的问题,提出了子模块电压的补偿方法。仿真和实验结果表明所提出方法的正确性和有效性。
英文摘要:
      The traditional sub module capacitor voltage measuring method requires the same number of sub module voltage sensor, which increases the system costs and burden of data acquisition system. In this paper, a new method based on the nearest level approach to detect the voltage of the MMC sub module is proposed. The method divides the sub module into groups, each group has only a voltage sensor to correct the observer voltage, and the method for improving the number of correction is proposed. Then a compensation method is proposed to solve the delay of voltage sampling circuit affecting the output voltage measurement accuracy. The simulation and experimental results show that the proposed method is correct and effective.
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