High-performance digital PI current regulator for EV switched reluctance motor drives

This paper presents a design methodology for digital proportional-integral current regulators that may be used for the highly nonlinear switched reluctance motor control. The important nonlinear behavior of saturation, back electromotive force (EMF), and mutual coupling are accounted for to achieve consistent current regulator performance over the entire operating regime. Gain adaptation is used with respect to both position and current to insure stability. An improved back-EMF decoupling scheme is implemented to reduce bandwidth requirements. The proposed control is implemented on a high-torque traction drive for electric vehicle applications. Simulation and experimental results demonstrate excellent performance over the entire operating regime.