一种新型的风力发电全功率变流器  

A Novel Full-Size Power Converter for Wind Energy Conversion System

作　　者：陈杰[1] 龚春英[1] 陈家伟[1] 张方华[1] 严仰光[1] 

机构地区：[1]南京航空航天大学江苏省新能源发电与电能变换重点实验室,南京210016

出　　处：《电工技术学报》2012年第11期160-168,共9页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划资助项目(2007CB210303)

摘　　要：提出了一种新型的风力发电全功率变流器,由电机侧自耦调压整流器(ATRU)和网侧Z源逆变器(ZSI)组成,具有结构简单、可靠性高、转换效率高等优点,为风力发电系统提供了一种可选的解决方案。文中首先简要地介绍了ATRU和ZSI的基本工作原理,对ATRU在变速风电机组中应用的可行性展开了推导分析,提出了相关设计要求。随后,针对网侧ZSI,详细地分析了其输入电压和直流链电压之间的内在关系,揭示了发电机和逆变器之间的参数匹配要求。设计了一种系统控制策略,实现了机组的最大功率跟踪,并提出了一种基于输入电压前馈的逆变器直流链电压控制方法,保证机组在各种风况下直流链电压的恒定。最后,设计了一套仿真实例,结果验证了新型全功率变换器及其控制策略的可行性和正确性,为下一步工程实现奠定了理论基础。Abstract A novel full-size power converter which consists of a machine side auto-transformer rectifier unit （ATRU） and grid side Z-source inverter（ZSI）is proposed in this paper. The power converter owns the merits of simple structure, high reliability, and high efficiency, which could cater for the off shore wind turbines where high reliability is required. The operational principle of the ATRU and ZSI is briefly introduced. Some design rules are concluded based on the feasibility analysis of applying ATRU to variable speed wind turbines. Then, the relationship between input voltage and dc link voltage of ZSI is carefully discussed, which decides the design requirements of PMSG and inverter A control strategy including the functions of maximum power point tracking （MPPT） function and dc link voltage stabilizing is devised for the wind energy conversion system （WECS）, based on the proposed full-scale power converter, and the input voltage feed forward control method is adopted for the ZSI. to improve the dynamic performance of do link peak voltage. Finally, a simulation case is implemented, and the simulation results show the correctness and feasibility of the proposed power converter and its control strategy.

关 键 词：风力发电 全功率变流器 ATRU Z源逆变器 最大功率跟踪 直流链电压 

分 类 号：TM315[电气工程—电机]