低频运行时MMC电容电压纹波抑制策略研究  

Low Frequency MMC Voltage Ripple Suppression Strategy

作　　者：刘伟[1] 赵诗坛 LIU Wei;ZHAO Shitan(School of Electrical and Information Engineering,Northeast Petroleum University,Daqing 163319)

机构地区：[1]东北石油大学电气信息工程学院,大庆163319

出　　处：《电气工程学报》2025年第1期140-149,共10页Journal of Electrical Engineering

基　　金：国家自然科学基金资助项目(11372071)。

摘　　要：低频运行时,模块化多电平变换器(Modular multilevel converter,MMC)存在较大的低频电容电压纹波,使输出电压波形畸变。针对这一问题,提出一种改进的高频注入策略。首先针对调制过程中模块电压计算值与实际值之间存在一定偏差的问题,选择采用基于实际值的调制方法。接着分析电容电压波动机理,并对高频注入基本原理进行分析,为了在现有高频注入法的基础上进一步优化高频环流幅值,提出方波和梯形波相结合的高频注入方法。最后,利用Matlab/Simulink对所提方法进行仿真验证,结果表明,该方法可在实现低频电压纹波抑制的基础上进一步优化高频环流和桥臂电流幅值,减小系统损耗。When modular multilevel converter(MMC)is operating at low frequency,there are relatively large low frequency capacitor voltage ripple,which causes the output voltage waveform distortion.Aiming at this problem,an improved high frequency injection strategy is proposed.Firstly,aiming at the problem that there is a certain deviation between the calculated value of module voltage and the actual value in the modulation process,the modulation method based on the actual value is selected to analyze the capacitor voltage fluctuation mechanism,and the basic principle of high-frequency injection is analyzed.In order to further optimize the amplitude of high-frequency circulation based on the existing high-frequency injection method,a high-frequency injection method combining square wave and trapezoidal wave is proposed.Finally,the proposed method is verified by Matlab/Simulink simulation.The results show that the proposed method can further optimize the high frequency circulation and the current amplitude of the bridge arm on the basis of realizing the low frequency voltage ripple suppression,and reduce the system loss.

关 键 词：模块化多电平变换器 低频运行 调制方法 高频注入 

分 类 号：TM561[电气工程—电器]