Wind Distributed System Based on Switched Reluctance Generator Using a Bidirectional DC-DC Converter with Sliding Mode Control

This paper proposes the utilization of a bidirectional DC-DC converter with sliding mode control in a wind distributed system employing the switched reluctance generator (SRG). The SRG wind system is connected to a three-phase AC utility grid by means of a voltage source converter. The presented proposal employes the DC-DC converter to regulate the optimum excitation voltage at the SRG side, while the VSC is responsible to maintain the DC bus voltage in a fixed value to allow the DC-AC conversion with the required voltage level and frequency. To face the problem of wide voltage variations, sliding mode control is applied to ensure the desired PWM duty cycle to the bidirectional DC-DC converter. SRG control is implemented through direct power control by current hysteresis, for low speeds, and by voltage single pulse control, for high speeds of operation. A careful examination about the behavior of the system considering the whole SRG operating speed range is carried out. Simulation results show that the proposal system is applicable and the applied sliding mode controller has rapid an robust behavior, as desired.