Reseach On The Control Strategy Of Parallel Switched Reluctance Generators Based On CAN Bus

With the development of the more-electric and all-electric aircraft, the aircraft power supply system, aircraft electric power system is going for the direction of hybrid power supply and high voltage DC power supply, which requires more about the aircraft power quality. Strong reliability, low facility fee and maintenance costs, and high power quality will continuously be the orientation in aero-generator development. With its simple and firm structure, high reliability and fault tolerance rate, Switched Reluctance Generator(SRG) is applicable to various bad working environment with multiple control methods, bringing out the highlight in aviation field. Illustrating with examples about the USA, F-35 “Lightning-II” have been already put in use which apply switched reluctance starter/generator as the main power system. Furthermore, so as to meet higher airborne power load and higher redundancy, higher fault tolerance and uninterrupted power supply, airborne power supply system needs to be composed of several main power supplies, which is called parallel generators. Therefore, SRG control in parallel becomes a valuable research topic.Parallel control consists of running control and current-sharing control, while running control is the system stability guarantee after motors have problems and current-sharing control is the power balance guarantee with multi-motors output which avoiding the exaggerate or understate output power of a single generator. Taking 12/8 SRG as the studying object, this topic provides parallel control simulation and design using the master-slave flow method and the maximum current flow method.In the first place, this research claims the significance of the topic studying with analyzing overseas and domestic research status. Secondly, the SRG principle is interpreted, along with the generating characteristics, mathematic model and control strategy. Then, with the foundation of building SRG model through Matlab/Simulink, two digital flow schemes are put forward on the basis of CAN bus and parallel current-sharing model is designed in multi-generators. Besides, in order to improve the dynamic and static performance in parallel system, a current-sharing controller is created basing on fuzzy PI control and the simulation shows the feasibility and superiority.Finally, according to the system functions and requirements, SRG starting/generation platform is set up, conducting the steady and dynamic experiments about generator performance. Furthermore, setting up the experimental platform of double generators, parallel generator is examined which turns out that the parallel control in double generators can be perfectly realized via digital flow scheme..