分布式控制同步误差对H桥并联拓扑结构均流特性影响分析  

Effects of Synchronization Error in Distributed Control on Current Sharing Characteristics in Parallel Connected H Bridge

作　　者：刘计龙[1] 肖飞[2] 陈伟[2] 范学鑫[2] 王瑞田[2] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]海军工程大学舰船综合电力技术国防科技重点实验室,湖北省武汉市430033

出　　处：《电力系统自动化》2015年第4期123-128,共6页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA040302);新世纪优秀人才支持计划资助项目(NCET-11-0871)~~

摘　　要：受现有电力电子开关容量限制,大容量直流变换器通常以开关管并联方式扩展装置单机容量。但驱动线路过多会增加装置的故障率和维护难度,装置容量变化时,控制器和驱动电路都要重新设计。针对该问题,提出一种基于分布式控制的H桥并联大容量三电平直流变换器拓扑结构,分析了分布式控制同步误差对H桥并联拓扑结构均流特性的影响。在H桥并联拓扑结构中通过高速光纤环网,实现多个H桥模块的驱动脉冲同步和分布式控制。分析了同步误差和死区宽度对装置稳定运行的影响,分布式控制同步误差和限流电感将决定H桥模块的电流均衡度,给出了H桥模块限流电感设计依据。制作了一台基于H桥模块并联的实验样机,对所述分析进行了验证。Restricted by the capacity of power electronics switches available,large-capacity direct current converter usually uses parallel connection of switches to expand its power rating.However,too many driver wires will increase the device failure rate and difficulty in maintenance.When device power rating changes,both the controller and driver circuit should be redesigned. To solve this problem,this paper proposes a novel parallel connected H bridges topology based on distributed control.The effects of synchronization errors on its current balance characteristics are analyzed.In this topology,a fiber ring net is used for the driver signal synchronization and distributed control.The effects of synchronization errors and dead zone width on the stable operation of the device are analyzed.The synchronization errors in distributed control and H bridge current-limiting inductor will determine the current sharing.The design basis of the H bridge current-limiting inductor is given.A prototype with H bridges in parallel connection has been built to verify the proposed analysis.

关 键 词：三电平直流变换器 H桥并联 分布式控制 同步误差 均流特性 

分 类 号：TM46[电气工程—电器]