【摘要】 直驱式永磁同步风电系统中背靠背式变换器所用开关器件数量较多,提出九开关变换器替代背靠背式变换器。首先,确定了九开关变换器两通道在直驱风电系统中的连接方式。其次,在分析九开关变换器的工作状态基础上,采用调制波中注入三次谐波的调制方法提高电压利用率。结合常规直驱式风电系统的控制策略,给出适用于九开关型永磁同步风电系统控制策略。最后,在Matlab/Simulink中建立系统仿真模型,验证控制策略的正确性。研究结果表明九开关变换器应用于直驱式永磁同步风电系统中,可实现传统直驱式风电系统相同的运行特性。更多还原

【Abstract】 The number of switch devices of the back-to-back converter in the direct-drive permanent magnet synchronous wind power system was large, and the nine switch converter was proposed instead of the back-to-back converter. Firstly, the connection mode of two channels of nine switch converter in direct-drive wind power system was determined. Secondly, based on the analysis of nine switch converter’s working state, the modulation method of injecting the third harmonic into the modulated wave was used to improve the voltage utilization. According to the control strategy of conventional direct-drive wind power system, a control strategy suitable for nine switch permanent magnet synchronous wind power system was proposed. Finally, the system simulation model was built in Matlab/Simulink to verify the correctness of the control strategy. The research results show that the nine-switch converter is applied to the direct-drive permanent magnet synchronous wind power system, which can achieve the same operating characteristics of the traditional direct-drive wind power system.更多还原