A Novel Power Injection Priority Optimization Strategy for Voltage Support Control of PSMG-based Wind Farm

Abstract

This paper proposes a novel power injection priority optimization-based control strategy of a PSMG-based wind farm (WF) that provides voltage support while mitigating the frequency excursion resulting from voltage dip during the fault. Different from the traditional reactive power support method, the reactive power injection priority plan is replaced by a novel optimal adaptive power injection priority plan. The control problem is formulated as a multi-objective function optimization problem, where the power injection priority flag is calculated by minimizing the shortfall of WF active power and maximizing the reactive power injection of WF. The power injection priority flag is employed as the control variable in the wind turbine generator control model. Additionally, the wake effect of WF is taken into consideration to achieve effective voltage support from the WF. The simulation system model and proposed optimal model are built in EMTDC/PSCAD and MATLAB respectively, to verify the effectiveness of the proposed strategy. Test results demonstrate that the proposed control strategy is applicable to mitigate frequency excursion while complying with the voltage support requirement during the fault.