ANALYSIS AND DATA PROCESSING SYSTEMS

Abstract
The dc power generation system (270 V 120 kW) based on a permanent magnet synchronous generator and an active rectifier is analyzed. A permanent-magnet generator converts mechanical energy into electrical energy. The design simplicity, a higher efficiency and lower operation costs of a permanent magnet synchronous generator are among its advantages. But the output voltage of a permanent magnet synchronous generator varies as it is proportional to the rotation frequency of the generator shaft which in its turn has almost a double range of variation. The paper proposes to stabilize an active rectifier output voltage by changing an input current phase. The stabilization is necessary because the generator rotation frequency changes in a double range and, therefore, generator voltages change in a double range too. It is necessary to increase voltage to a required value by an armature magnetizing reaction at a low speed and a maximum load, and decrease the voltage by an armature demagnetizing reaction at a high speed and a minimum load. The main energy characteristics in various operation conditions with the proposed stabilization technique are obtained by analytical calculations and simulation. The simulation results of the power generation system show that the generator total power is higher by 11 % than the maximum load power and the best energy characteristics are obtained when the generator frequency is 1000 Hz and the load range is 50…100 %. This corresponds to the designed aircraft cruising speed. Owing to the known principles of a semiconductor converter operation based on the voltage source inverter there is an opportunity to change the power flow direction without using any additional switching equipment, i.e. the considered active rectifier in the power generation system can be used to implement a turbine start in the presence of a dc source.

 

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