Robust controller designs of switched reluctance motor for electrical vehicle

The strong nonlinear and uncertain parameters of the switched reluctance motor make the traditional controllers difficult to ensure its performance and stable operation under diverse operating conditions. In this paper, we present two designs of H_∞, robust controller for switched reluctance motor drives for electrical vehicle to aim at attenuating the effect of disturbances and parameters uncertainties. For the application of the H_∞ theory, we have adopted the cascade control architecture (velocity - torque). The first controller of velocity in the outer control loop products the total torque of SRM. Hence, a linear equivalent mechanical dynamic is obtained. In the inner control loop, the phase reference current is determined using the torque-angle-current (T-θ-i) characteristics stored in a tabular form, the torque is regulated indirectly through the second controller of current. The design of both speed and current robust controllers using modern H_∞ control theory is then summarized. For each control loop, two H_∞ synthesis approaches are used and compared by μ-analysis. The simulation results demonstrate the effectiveness of the designed robust controllers and confirm the ability of the proposed designs.