Research On The Control Strategy Of Three-Phase To Single-Phase AC Power Generation System Based On The Open-Winding PMSG

Permanent magnet synchronous generator(PMSG) has been widely used in the vehicle power supply system and wind energy generation system for its merits of high power density, high reliability and high efficiency. The open-winding PMSG, with the inherent advantages of PMSG, has the characteristics of independent voltage regulation of each winding, high fault-tolerant rate and flexible converter configuration, which extends the application field of PMSG. Based on the open-winding PMSG, this thesis adopts a paralleled dual-inverter topology to realize the three-phase to single-phase AC power conversion of the PMSG system over a wide range of frequency and the control strategy of the power generation system is proposed.Firstly, the overview of the research on the open-winding motor topology is introduced. On the basis of the paralleled open-winding PMSG system, the configuration of the three-phase to single-phase AC power generation system including the inverter, the open-winding PMSG, the capacitor and the single-phase load is proposed. The basic operating principle of the proposed system is analyzed via the working mode with different switching state and the steady-state power flow. Then, the control strategy of the positive-sequence and zero-sequence component of the generator current to realize the stable voltage output was presented.Secondly, the simulation model that consists of the open-winding PMSG, the main power circuits and the kernel control arithmetic is built via the software of Matlab/Simulink. The theoretical feasibility of the proposed control strategy is verified by the simulation results.Finally, the hardware platform built on the real-time simulation control system is established. The design details of main hardware circuits including the power circuit, the sampling circuit and the protection and latch circuit are introduced. Then, the rapid control prototyping of the control strategy is realized by the AD5435. The experiment results focused on the 2k W open-winding PMSG demonstrates the validity of the three-phase to single-phase AC power generation system and the feasibility of the system control algorithm.