ANALYSIS AND DATA PROCESSING SYSTEMS

Abstract
An integrated starter-generator set for off-line systems allows combining the starter and the generator into one unit. A vehicle-type block diagram of the starter-generator is presented in this paper. Permanent magnet synchronous machine control in the starter and generator modes is proposed. The electric machine is fed by a supercapacitor via a voltage source inverter and operates as an engine in the starter mode. As soon as an internal combustion engine starts operating, the inverter begins to operate as an active rectifier, and the electric machine as a generator. It is necessary to stabilize the voltage generated by the electric machine at the required level at all ranges of load and shaft speeds. An output voltage of the permanent magnet synchronous machine is proportional to the rotor speed. It is necessary to increase voltage by armature magnetizing reaction at low speeds, and decrease voltage by armature demagnetizing reaction at high speeds. Output voltage stabilization is implemented by a voltage source inverter which provides an electric machine leading or lagging armature current. The realization of the proposed control circuit has been verified on a mathematical model. The results of modeling in the starter and generator modes are given in this paper.

 

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