Control reconfiguration strategy for Doubly Fed Induction Machine pumped storage unit under balanced grid faults

This paper proposes a reconfiguration scheme of a control strategy for a Doubly Fed Induction Machine based pump turbine system under balanced grid faults. The start-up and synchronization procedures are initially achieved before pump or turbine mode, with a different control at each of these three working zones. A control reconfiguration method is proposed when balanced grid faults occur during pumping mode. The reconfiguration is performed into two steps. Firstly, the control is switched from the pumping mode one to the control used for synchronization. The second step is to return to the pumping mode. The first step allows the pumping mode control parameters to be adapted to the faulty grid conditions. Study Simulations are carried out on a 4kW laboratory set-up to illustrate the effectiveness of the proposed approach.