Two Phases Excitation Control Of Aero Three-stage Starter/Generator

The More Electric Aircraft(MEA) and All Electric Aircraft(AEA) are very important development directions of airplane in the future, which calls for more degree of integration and multi-functions in their power systems. Recently the three-stage brushless synchronous motor is widely used in the areonautic high power AC generator systems due to its adventage of high power density and high integration degrees.In order to further improve the system integration degree, it becomes a research hotspot to complete the integration of starter and genrator of the aero three-stage brushless synchronous genetaor. This thesis focuses on the disadvantages in single phase and three phases excitation of the TSG system curently, and develops a new starting control method using two phases excitation struction. By the way, this paper designs a starting control system based on the DSP and FPGA.An AC and DC exciting model of the two pahses excitor is built after the coordinate transformaiton in this thesis. Then a constant speed slip starting strategy using the two phases AC excitation is developed, and a calculatiing method of the initial exciting frenquence f0 is presented. During the DC excitaion period, a constant product of speed and excitation voltage control method is developed, and the switch point and method when it changes from AC mode to DC mode is discussed. The simulation model of the two new excitation control strategies and the direct torque angle control method of the TSG main generator are built by using the MATLAB simulink tools. The simulation results indicate that the methods fit the demands of the starting of the TSG system.In order to meet the actual requirements of the starting control system of the TSG, a two phases excitation starting controller is designed based on two aspects in this thesis, which are the main power topology consists of the IGBT, MOSFET modules and the main control circuit with DSP TMSF320F2812 and FPGA JQV300. In the main power topology, the IGBT driver circuit and snubber circuit are designed. In the main control circuit, the DSP minimum system, rotor position detection circuit, communication circuit, analog input and signal conditioning circuit, and protection circuit are also designed.Finally, the software of the TSG starting controller is designed in this thesis. Then an aeronautic TSG motor with load istested on the testbench by using the starting controller. Experiment results verify that the control method in this thesis satisfies the rapid starting demands of the TSG motor, and some improvements are achieved in the stability and load capacity of motor state.