基于可变频率变压器的近海风力发电系统控制

Control of offshore wind energy conversion system based on variable frequency transformer

文章提出了一种由可变频率变压器和鼠笼式异步发电机群组成的变速近海风力发电系统。该系统采用结构坚固可靠的鼠笼式异步发电机群集中控制,减少了近海风电场的建设和维护成本。利用可变频率变压器将风电场侧变频交流母线与恒频电网相连接,实现了风电机组的变速发电。首先简要描述了所提出近海风力发电系统的拓扑结构和工作原理,然后分析了可变频率变压器的稳态特性,并在稳态等效电路的基础上设计了控制方案,最后仿真验证了所提出的风力发电系统及其控制方案的有效性。

A variable speed offshore wind energy conversion system（WECS） using variable frequency transformer（VFT） and squirrel-cage induction generator（SCIG） group is proposed. The system adopts a reliable and robust SCIG group centralized control, which reduce the construction and maintenance costs of offshore wind farm. The VFT is used to connect the variable frequency AC bus of the wind farm to the constant frequency power grid, which enables the variable speed generation of wind turbines. This paper briefly describes the topology and operation principle of the proposed offshore WECS, the steady state characteristics of the VFT are analyzed, and the control scheme is designed based on the steady state equivalent circuit. Simulations are carried out to validate the feasibility of the proposed WECS and the designed control scheme.