不同整流系统对直驱永磁风力发电机的性能影响及选型评估

Influence of Different Rectifier Systems on Performance of Wind Direct-Driven Permanent Magnet Generator and Type Evaluation

在设计兆瓦级永磁直驱风力发电机组时,为降低整个机舱的重量,必须使多极永磁同步发电机具有较高的功率密度,这就需要其具有较高的电感值。因此,发电机出口侧整流器类型的选择对发电机的功率、效率,以及风力发电机组的产能具有非常大的影响。对电机模型及常用的变流系统控制策略进行了介绍;再以金风科技股份有限公司1 200 kW直驱永磁同步发电机为实例,对不同整流系统下,电机磁链、电流、功率等参数的特性曲线进行了理论分析及对比说明,详细阐述了二极管整流、串联电容补偿二极管整流、并联电容补偿二极管整流及晶体管主动整流这四种整流系统对发电机运行性能的影响;最后,针对不同整流系统的控制策略及其电机的设计特点对四种整流系统的选型方案进行了综合评估。

In the design of MW class Direct-driven permanent magnet wind turbine, the power density of generator is generally high so as to reduce the weight of nacelle.Therefore,the generator inductance will be high and the power and efficiency of the generator as well as the energy yield of the wind turbine are sensitive to the type of rectifier.Firstly,the generator model and the rectifier control strategy are introduced.Then take Goldwind 1 200 kW generator for example,the performance curves of the generator operating under four rectifier systems are compared and analyzed.Finally the type evaluation of the four systems are made combined with the design feature of the generator and control strategy of rectifier systems.