Digital Simulation Research On Tactical Universal Helicopter's Power System

Along with the rapid development of More Electric Aircraft technique, the aircraft electrical system becomes more and more complicated. The research of aircraft's power supply system has widely aroused the domestic and foreign researchers' interest, and become the important factor of affecting and boosting the development of aero technique.R&D of practicality has unsuited the times developed requirement, because of its long period and high cost. Since the development of the simulation technique, the digital simulation of power system provides a visual analytic method for the aircraft's power supply system and is popular with the researchers, because of its special flexibility and advantage.Based on the Matlab/Simulink setting, the fundamental theory of the synchronous machines is analyzed in detail. After modifying the synchronous machine's Matlab model, this paper sets up the constant speed constant frequency(CSCF) brushless AC generator system, and its automatic voltage regulator(AVR) is designed. The electromagnetic environment of distributed power system, based on the CSCF generator system, and its filter theory are discussed. Especially, the Electro Magnetic interference(EMI) of the transformer rectifier unit(TRU) is analyzed. The research make clear that the three-phase four-wire common mode choke could restrain the TRU's EMI effectively. Based on the small signal approach, the constant power load(CPL)'s model is set up. With the research on the stability of the CPL's negative impedance characteristic, this paper proposes guarantees for the power system to be stable, which are confirmed by the simulation result. Finally, according to the aircraft power system's project plan, the simulation models of the tactic universal helicopter's power system are set up. The simulation results indicate that the simulation model have implemented the power system's fault tolerant function.