A Multi-Objective Control Strategy for Three Phase Grid-Connected Inverter During Unbalanced Voltage Sag

This paper presents a new multi-objective control strategy for inverter-interfaced distributed generation (IIDG) to ensure its safe and continuous operation under unbalanced voltage sags. The proposed can effectively improve the low ride through (LVRT) capability, reduce active power oscillations, limit overcurrent simultaneously, which are marked as most important objectives of IIDG during advanced support scheme, utilizes positive sequence component, is firstly maximize LVRT capability Then, safety IIDG, oscillation suppression current limitation algorithm designed individually. Based on algorithms such objectives, method, including scenario classification reference determination, then presented achieve three various system conditions simultaneously. Finally, case studies evaluations based MATLAB/Simulink carried out illustrate effectiveness method.