变流器在双馈风电系统中的应用

Applications of Back- to- back Converters in Wind Power System based on Doubly Fed. Induction Generator

变流器作为一种能量转换器，广泛地应用于国民经济各部门、各领域。由于使用了变流器，使得发电机、传输电力的电网以及用电设备都有可能选择最合适的工作电压，安全而经济地运行。双馈式（DFIG-Doubly Fed．Induction Generator）变速恒频风力发电机组具有可减少功率变流器容量，有功、无功功率独立调节，柔性并网等多种特点，成为MW级变速恒频风力发电机系统并网发电的主流。通过对变流器在双馈风电系统中的理论分析，验证了变流器在实际应用中的有效性和可靠性。

The converter is widely used as a device to transfer energy in many national economy areas. With the converter, generators, power networks and other electric devices can operate at the optimal working voltage with safety and low costs. Doubly Fed. induction generator is currently the most popular technology in wind power system. The main advantage of DFIG is that it transfers partial power through .the converter, which makes the converter smaller compared with the full-size one. It enables the generator to capture the maximum wind power and permits active and reactive power to regulate independently. This paper describes the principle using converters in DFIG wind power system and the experimental results show that converters work effectively and reliably