燕山大学学报2016，Vol.40Issue(1)：81-87,7.DOI:10.3969/j.issn.1007-791X.2016.01.013
三相三线和四线NPC三电平变流器中点电位控制方法
Neutral-point potential control method of three-phase three-wire and four-wire NPC three-level converter
摘要
Abstract
For neutral⁃point⁃clamped NPC converter of three⁃phase three⁃wire 3P3W and three⁃phase four⁃wire 3P4W first⁃ly the unified and general mathematical model of neutral⁃point potential NPP fluctuation is established in this paper the corre⁃sponding control strategy is derived and the corresponding NPP control model is established.For 3P3W system the control strategy is that the output zero sequence voltage of equalizing loop is superimposed to three⁃phase modulation voltage to realize the NPP con⁃trol the NPP given error calculation is decided by the system working mode. For 3P4W system the double closed loop control of NPP outer loop and current inner loop is adopted and zero sequence current is adjusted by equalizing outer loop to achieve the NPP balance control.Secondly equalizing loop open⁃loop cutoff frequency constraints of the two systems is analyzed in this paper and the cutoff frequency values which are needed by the actual system are obtained within the scope of the constraint condition.Finally the correctness of the theoretical analysis is verified by MATLAB simulation.关键词
中点电位控制/三相三线/三相四线/均压环Key words
NPP control/three-phase three-wire/three-phase four-wire/equalizing loop分类
信息技术与安全科学引用本文复制引用
柴秀慧,张纯江,郭忠南,贲冰..三相三线和四线NPC三电平变流器中点电位控制方法[J].燕山大学学报,2016,40(1):81-87,7.基金项目
国家自然科学基金资助项目（514771480）；河北省自然科学基金资助项目 （）
