Title: VSCF brushless doubly-fed stand-alone control of power systems

Title: VSCF brushless doubly-fed stand-alone control of power systemsAuthor: Wu TaoDegree-granting units: Huazhong University of Science and TechnologyKeywords: brushless doubly-fed generation;; wound rotor;; scalar control;; vector decoupling control;; marine shaft powerSummary:AC excitation current in the double-fed motor speed constant frequency power system is widely used, but mostly brush structure, but BDFM eliminating brush and slip ring structure, easy maintenance, more reliable, but the performance has not yet reached less than a practical requirement. Constraints BDFM performance bottleneck is the main rotor, rotor structure of the existing special cage and reluctance-two, a large harmonic content, power density, while the use of new Neodymium Magnets wound rotor wiring flexible, effective reduce the harmonic content, improve the utilization of the conductor, the BDFM to solve the problem of low efficiency, which has broad application prospects.In this paper, wound rotor BDFM for the study, mainly to study stand-alone as an independent power generating operation rules and methods. Papers in the analysis of a "pole-Law" and "tooth harmonic method" design wound rotor BDFM rotor structure, the magnetic field modulation theory, operating principles based on the study of the BDFM in the power generation state run-time energy transfer between the motor is derived and the establishment of equations of mathematical physics and control system characteristics according to established models and voltage control current source control model for the BDFM stand-alone power generation to run the state, were studied using scalar control strategy proposed and vector decoupling control strategy, in which scalar closed-loop control using voltage and frequency, focused on a different PID parameters of the system dynamic performance, comparing the voltage source model and the current source model for dynamic response; vector dual synchronous decoupling control is coordinate model of decoupling the rotor field oriented vector control strategy, derived power winding and control winding current-voltage relationship between the precise, because of its stand-alone http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets stand-alone power generation voltage is not constant, is proposed based on the power winding flux loop correction model , combined with wound rotor structure for wound rotor BDFM rotor current can be measured, the rotor current measurement is proposed based on the precise current control model and experimental measurements of a full data calculation of equivalent circuit parameters methods for vector control decoupling provides a practical basis.This paper also studied the use of scalar control marine shaft power control system of the actual control system structure, describes the use of 80C51F200 various parts of the control circuit works, the main program flow, and the use of commercial inverter control method and energy feedback device works, developed a power output of 64kW marine shaft brushless doubly-fed generator prototype, and test prototype of the power state of the running to build pressure, speed and load changes in the dynamic process simulation and experimental research, prototype Experimental and theoretical analysis and simulation results match.Degree Year: 2009