三相四线三电平储能变流器中点平衡优化控制  

Optimization control of neutral-point balance in three-phase four-wire three-level power conversion system

作　　者：肖琨羿 刘江 欧阳晖[3] 王斌[1] XIAO Kunyi;LIU Jiang;OUYANG Hui;WANG Bin(College of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;College of Electrical Information,Wuhan Institute of Technology,Wuhan 430205,China;Wuhan Second Ship Design and Research Institute,Wuhan 430064,China)

机构地区：[1]武汉科技大学信息科学与工程学院,湖北武汉430081 [2]武汉工程大学电气信息学院,湖北武汉430205 [3]武汉第二船舶设计研究所,湖北武汉430064

出　　处：《舰船科学技术》2024年第15期63-69,共7页Ship Science and Technology

基　　金：湖北省自然科学基金资助项目(2021CFB030)。

摘　　要：传统三电平中点平衡控制方法在低不平衡度下对中点波动的抑制效果显著,然而在高不平衡度负载下有待改进。本文通过对不平衡程度进行实时检测分析,提出一种基于零电平分解的中点平衡优化控制方法。在不平衡程度达到临界阈值时,对零电平分解作用区域和分解量进行协调控制,使三电平三桥臂储能变流器在高不平衡度工况下的中点电压波动得到较好抑制。仿真实验结果验证了所提方法在各不平衡度负载工况下均具有良好的中点电位平衡能力。The traditional three-level neutral-point balance control method has a significant suppressive effect on neutralpoint fluctuations under low imbalance,but needs improvement under high imbalance loads.In this artical,a neutral-point balance optimization control method based on the disassembly of zero level is proposed through real-time detection and analysis of the degree of imbalance.When the degree of imbalance reaches the critical threshold,coordinated control is carried out on the disassembly area of zero level and disassembly amount to effectively suppress the neutral-point voltage fluctuation of the three-level three-leg power conversion system under high imbalance conditions.The simulation experimental results verify that the proposed method has good neutral-point potential balancing ability under various unbalanced load conditions.

关 键 词：储能变流器 三相四线制三电平 零电平分解 中点电位平衡 

分 类 号：TM46[电气工程—电器]