基于并联型变换器的永磁同步发电机矢量控制

Vector Control of Permanent Magnet Synchronous Generator Based on Parallel Converters

当永磁同步发电机接并联型变换器时,由于并联变换器之间会相互影响,采用传统模型进行控制时会对发电机的运行性能产生不利影响。为此,文中给出了基于并联型变换器的永磁同步发电机模型,并得出了其等效电路,分析了并联变换器之间的相互影响。考虑到风电机组工作环境恶劣,根据两相静止坐标系下的状态方程设计了滑模观测器,实现了永磁同步发电机的无位置传感器矢量控制,提高了系统的可靠性。根据上述分析,设计了前馈解耦控制策略,既实现了d轴和q轴分量之间的解耦,又削弱了两并联变换器之间的耦合,提高了系统的运行性能。最后,对一组10kW直驱型风电平台进行了仿真及实验验证,证明了上述分析的正确性。

When the permanent magnet synchronous generator（PMSG） is connected to the parallel converters,controlling the generator according to the traditional model has a bad influence on the operation performance of the generator,due to the interaction between the parallel converters.Therefore,the PMSG model based on parallel converters is presented.The equivalent circuits are obtained and the interaction between the parallel converters is analyzed.Taking into account the adverse operation environment,a sliding mode observer is designed according to the state equation in the two-phase stationary coordinates.The position sensor-less vector control of PMSG is achieved and the system reliability is improved.Moreover,the feed-forward decoupling control strategy is designed according to the above analysis.Not only are the d-axis components and the q-axis components decoupled,but also coupling between the parallel converters is weakened.Therefore the operation performance of the system is improved.Finally,simulation and experiments have been done on a 10 kW direct-drive wind power platform,which validates the above analysis.