The Research Of A Wound Rotor Brushless Doubly-fed Machine Stand-alone Variable Speed Constant Frequency Power Generator Control System

AC excitation current of doubly fed variable speed constant frequency electrical power generation system has in the widely been used, but mostly with brush structure, which the BDFM eliminates brush and slip ring structure.It has easy maintenance, more reliable, but the performance has not yet reached practical use. It considers that constraints of BDFM performance bottlenecks mainly rotor, the existing structure, with special cage rotor and the reluctance type ,also have a large harmonic content, power density, and using the new method for wound rotor wiring flexible, can effective reduce the harmonic content, improve the conductor utilization.BDFM solves the problem of low efficiency, which has broad application prospects.In this paper, an emphasis on control of brushless doubly-fed stand-alone power generation system has been more in-depth researched. The paper analyzes the brushless doubly-fed machine's structure of stator and rotor, the magnetic field modulation principle, operating principle. Based on the derivation and the establishment of a motor mathematical model, namely the establishment of the voltage source control model and the current source control model of power generation is running the dynamic simulation. Generator System Operation Control Strategy includes: scalar and vector control strategy for decoupling control strategy, namely the establishment of the corresponding simulation model of correct simulation results. Scalar control with voltage and frequency of the closed-loop analysis model uses different PID parameters on the system dynamic performance. The vector decoupling control reference model is according to synchronous coordinates decouple the rotor flux-oriented vector control strategy which is derived the power winding voltage and control the precise relationship between the winding currents to establish simulation model The results confirm the correctness of control strategies. According to the a special structure of the Wound-rotor BDFM, the paper proposes a control method of a precise rotor's current measurement. Paper discusses the use of scalar control method of marine-axis drive system with the actual composition of power generation, and introduces the various parts circuit working principle of 80C51F200 control system, the main program flow, mainly introduces the use of commercial inverter control method and energy feedback device works. Finally, through 64kW marine shaft brushless doubly-fed generation system,the paper made an introductory experiment, and experiments done in a few special problems analysis and commentary.