Study on Predictive Control Strategy of Pumped-Storage DFIM with Dual-Objective Constraint Model Under Grid Voltage Imbalance Condition

In this paper, a model predictive direct power control (MPDPC) strategy based on a dual-objective constraint model for pumped-storage doubly-fed induction machine (DFIM) is proposed to solve the problem that the conventional control method cannot output stable power and high-quality current at the same time during the generation condition of pumped-storage DFIM under the condition of grid voltage unbalance. Compared with the traditional control strategy, this strategy simultaneously takes the stator output power and stator current as the control objectives, and reduces the degree of stator current distortion under the condition of grid voltage imbalance with small stator power fluctuation, so as to make both indexes comply with the requirements.