摘要
传统单移相(SPS)控制策略下三有源桥(TAB)变换器控制简单,但内部存在较大回流功率,增加了变换器的电流有效值和损耗。采用多重移相(MPS)控制策略虽然能提高控制灵活度、降低回流功率,但其分析过程复杂、移相角选取思路不明确。针对上述问题,该文提出一种MPS控制策略下TAB变换器的简化分析模型和优化控制策略。首先建立TAB变换器的傅里叶级数等效模型,推导MPS控制策略下TAB变换器的统一表达形式,并提出TAB变换器的简化分析模型,降低了MPS控制策略下TAB变换器的分析和计算难度;然后结合简化分析模型,提出一种基于无功功率的TAB变换器优化控制策略,能有效减小TAB变换器的电流有效值,降低控制器的设计难度;最后通过仿真和实验验证了所提控制策略的有效性。
Under the traditional single-phase-shift(SPS)strategy,there is a large backflow power in the triple-active-bridge(TAB)converter,the backflow power increases the RMS current and the loss of the converter.Multi-phase-shift(MPS)strategy can improve the control flexibility and reduce the backflow power,but the analysis process and the phase shift angle selection method are extremely complicated.To solve this problem,this paper proposed a simplified analysis model based on multiple phase shifts and an optimized control strategy.Firstly,this paper established the equivalent Fourier series model of TAB converter,derived the unified expression form of TAB converter under MPS control strategy,and proposed a simplified analysis model of TAB converter,which reduces the difficulty of analysis and calculation of TAB converter.On this basis,an optimized control strategy based on reactive power is proposed,which can reduce the RMS current and the loss of TAB converter.Finally,simulation and experiment verified the effectiveness of the proposed control strategy.
作者
刘贝
帅智康
肖凡
涂春鸣
周达
Liu Bei;Shuai Zhikang;Xiao Fan;Tu Chunming;Zhou Da(National Engineering Research Center for Electricity Transformation and Control Hunan University,Changsha 410082 China;Marketing Service Center State Grid Jiangsu Electric Power Co.Ltd,Nanjing 210019 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第11期2394-2407,共14页
Transactions of China Electrotechnical Society
基金
国家重点研发计划(2018YFB0904100)
国家电网公司科技项目(SGHB0000KXJS1800685)资助。
关键词
三有源桥变换器
多重移相
傅里叶级数模型
无功功率
电流有效值
优化控制策略
Triple active bridge(TAB)converter
multi-phase-shift
Fourier series model
reactive power
current root-mean-square
optimal control strategy
