The negative-sequence suppression control strategy and low-voltage ride-through control strategy are adopted when the inverter-based power supply fails，which leads to a serious inequality between the distribution coefficients of positive- and negative-sequence currents at the energy storage station side in a full-scale new energy system，resulting in incorrect phase selection of the phase current difference mutation element.Based on the fault sequence component network，the constraint condition for the correct phase selection of the phase current difference mutation element is derived.A phase selection performance recovery scheme based on fault component regulation is proposed，which can eliminate the degradation of phase selection performance at the energy storage side caused by unequal distribution coefficients of positive- and negative-sequence currents.Simulation results show that the proposed scheme restores the performance of the traditional current mutation phase selection element at the energy storage side in a full-scale new energy system，enabling existing current mutation phase selection schemes to remain applicable to high-penetration and even full-scale new energy grids.