Vector control of permanent magnet synchronous generator based on parallel converters

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.