| Due to advantages of high reliability, small volume, low weight and good fitness to loads in theConstant Frequency power system, Variable Frequency(VF) AC power system has been attractive asthe main power system for the civil aircraft. In order to further reduce the weight, integration of starterand generator is becoming the key technology of VF AC power system. However, there are manydifficulties of VF generator used as starter for the engine cranking, the starting control strategy isbecoming imperative, and it is also the hot research spot for the foreign aeronautical electroniccorporations and universities.Three stage synchronous machine (TSSM) is one of the most widely used machines inaeronautical power system. A great deal of research works have beed done on focus of excitation andstarter control strategies of TSSM. Therefore, this thesis gives the analysis and coordinated controlmethod for the exciter and main generator of TSSM in the starter mode.The feasibility of theintegration strategy of AC and DC excitation is verified, and the starter control strategy based on theair-gap flux vector control is also proposed for the TSSM.Firstly, a new structure of TSSM with the open-winding structure in the exciter and itsmathematical models are proposed. Then, the analysis of the implementation for the exciter and startercontrol strategy is carried out theoretically. The comparation of the improved integration andtraditional integrator is given for the air-gap flux-based vector control method, and the realization ofthe air-gap flux observer is analyzed in detail finally.The simulation model of the TSSM starter system is built based on the mathematical models andthe control strategies of exceiter and starter, and the system starting operation principle has beenconfirmed. At last, experiment results from the hardware platforms using the TMS320F28335verifythe accuracy and feasibility of proposed control strategy for VF AC power system. |
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