标题：Space Vector Modulation Method for Simultaneous Common Mode Voltage and Circulating Current Reduction in Parallel Three-Level Inverters
作者：Zhang, Qinghao; Xing, Xiangyang; Sun, Kai
作者机构：[Zhang, Qinghao; Sun, Kai] Tsinghua Univ, Dept Elect Engn, State Key Lab Power Syst, Beijing 100084, Peoples R China.; [Xing, Xiangyang] Shandong Un 更多
通讯作者：Sun, Kai;Sun, K
通讯作者地址：[Sun, K]Tsinghua Univ, Dept Elect Engn, State Key Lab Power Syst, Beijing 100084, Peoples R China.
来源：IEEE TRANSACTIONS ON POWER ELECTRONICS
关键词：Common mode voltage (CMV); large; medium; small; zero vector modulation; (LMSZVM); parallel three-level Ttype inverters (3LT2Is); zero sequence; circulating current (ZSCC)
摘要：Parallel three-level inverters are widely used in highpower applications for increasing the power capacity of the system. However, when multiple three-level T-type inverters are connected to a single dc bus, the zero sequence circulating current (ZSCC) will be generated. For the operation of paralleled inverters, another requirement is to reduce the common mode voltage (CMV) associated with pulsewidth modulation (PWM) method. As these two issues are mutually coupled, the conventional space vector modulation (SVM) and active control methods reported so far cannot address them properly simultaneously. To overcome this limitation, a modified SVM technique is proposed to reduce the CMV, suppress ZSCC, and balance neutral point (NP) voltage. The generating mechanism of the ZSCC with respect to modulation scheme is analyzed. Based on the analysis, the large, medium, small, zero vector modulation method is proposed for reducing ZSCC and balancing the NP voltage with reduced CMV as the same in large, medium, zero vector modulation. Furthermore, the effectiveness of the proposed method is verified by comparing its results with those of the convectional PWM. The results are obtained from simulation and experiments.