SRG Load Voltage Control Strategy Based on Turn- Off Angle Modifying

Abstract

This paper presents a control strategy for the Switched Reluctance Generator (SRG) output voltage. The developed technique uses a PI controller to vary the magnetization angle of the machine phases, acting on the value of the turn off angle in one of the switches of the half-bridge converter, allowing the inclusion of a freewheeling step between the magnetization and demagnetization of the phases. This strategy was implemented both in simulation (Matlab/ Simulink® ) and experimentally (through DSP). Results with and without the freewheeling step were compared, showing that its addition for the SRG magnetization control substantially increases the energy conversion capability. Besides, the obtained results demonstrated that the proposed strategy is also able to perform an accurate control of the generator output voltage, even in transient situations.