永磁风力发电系统用矩阵式电力电子变压器

Matrix-type Power Electronic Transformer for PMSG-based Wind Power Generation System

为实现风力发电系统输入输出之间的电压等级变换和电气隔离,提出了一种基于矩阵式电力电子变压器的永磁风力发电变流器方案,其具有输入输出波形质量优良、无需储能元件、功率密度高、可靠性高、效率高和成本低等显著优点。文中对其拓扑结构和工作原理进行分析,并针对该拓扑提出一种控制策略:通过对整流级的控制实现输入侧功率因数校正,中间隔离DC-DC变换器用于实现电压等级变换和电气隔离功能,而逆变级则完成最大风能跟踪控制和网侧功率因数控制。仿真结果证明了该方案的有效性,其非常适用于大功率永磁直驱式风力发电场合。

In order to achieve voltage scaling and galvanic isolation between the input side and output side of wind energy conversion system, a matrix-type power electronic transformer （PET） was proposed for PMSG-based wind energy conversion system, which has the advantages of sinusoidal input and output currents, requiring no energy storage elements, high power density, high reliability, high efficiency and low cost. After introducing the topology and operating principles, a control scheme was developed for the presented PET. With the developed control scheme, rectification stage of the PET is used to realize power factor correction at the input side, and isolated high frequency DC-DC converter is equipped to achieve voltage scaling and galvanic isolation, while the inversion stage is used for tracking the maximum power point of wind power and regulating the output power factor. Therefore, it is an attractive solution for high power PMSG-based direct-drive wind power generation system. Simulation results verified the correctness and feasibility of the method.