A Modified Neutral-point Voltage Control Strategy for Three-level Inverters Based on Decomposition of Space Vector Diagram

作     者：Dereje Woldegiorgis H.Alan Mantooth Dereje Woldegiorgis;H. Alan Mantooth

作者机构：Department of Electrical EngineeringUniversity of ArkansasFayettevilleAR72701USA 

出 版 物：《CES Transactions on Electrical Machines and Systems》 (中国电工技术学会电机与系统学报（英文）)

年 卷 期：2022年第6卷第2期

页      面：124-134页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

主　　题：Three-level inverter Neutral-point voltage control Execution time 

摘      要：Capacitor voltage imbalance is a significant problem for three-level *** to the mid-point modulation of these inverter topologies,the neutral point potential moves up or down depending on the neutral point current direction creating imbalanced voltages among the two *** imbalanced capacitor voltage causes imbalanced voltage stress among the semiconductor devices and causes increase output voltage and current *** paper introduces a modified voltage balancing strategy using two-level space vector *** decomposing the three-level space vector diagram into two-level space vector diagram and redistributing the dwell times of the two-level zero space vectors,the modified voltage balancing method ensures minimal NP voltage *** to the commonly used NP voltage control method(using 3L SVM[9]),the proposed modified NP voltage control method offers a slightly higher neutral-point voltage ripple and output voltage harmonics but,it has much lower switching loss,code size and execution time.