Switched reluctance generators and their control

Abstract

This paper discusses how the switched reluctance generator (SRG) converts energy as directed by a controller. Beginning with a review of the electromechanics of generation, the paper identifies the implications of the energy conversion process on how the SRG is controlled. The structure of the SRG controller for speed-control and power-control applications is discussed. Practical implementation details for commutation of the SRG are reviewed. Concepts are illustrated with a 6-kW SRG designed to serve as a starter/alternator in automotive applications.

Development of Analytical Models for Switched Reluctance Machine and their Validation

“…During falling inductance period, variation of inductance with respect to rotor position is negative. Therefore torque generated is also negative [11]. If the phase is excited in this period, rotor experiences torque which opposes rotation and extracts energy from the turbine.…”

New Approach for Optimizing Control of Switched Reluctance Generator

“…4 shows the relationship between the idealized inductance profile and phase currents for generating at single voltage pulse and PWM voltage, above base speed at which the phase currents are nominally constant without need for regulation. It also represents the speed where the back-emf E balances the source voltage V and resistive drop RI [5]. …”

“…An application such as wind energy would focus on regulating the speed of the SRG relative to that of the wind stream in order to force peak aerodynamic efficiency [5].…”

High Efficiency Operation of a Switched Reluctance Generator over a Wide Speed Range

“…The rotor construction is very simple, because it consists of only laminated steel. The stator part consists of concentrated phase windings mounted on salient poles [1]. This is good in a commercial sense, since the manufacturing cost is low [2].…”