Real Time Simulation of 3-Φ Grid-Connected Converter with Real and Reactive Power Control Under Different Grid Fault Conditions

摘要

In this article, a flexible pq reference current generation technique is used to control active and reactive power for a 3-Φ grid connected converter fed by a 800 V DC source. Grid connected operation is controlled by a converter output voltage, and output voltage of converter is controlled by a controller that generate pulses for converter. Controller uses phase locked loop (PLL) for calculating phase and frequency of grid voltage, P and Q reference is set according to load then compared with Vd and Vq quantities and then feed to Pi-based current controller to generate pulses. Various grid fault conditions low voltage ride through (LVRT), high voltage ride through (HVRT), low frequency ride through (LFRT) and high frequency ride through (HFRT) are injected for 0.5 s and then analysis had been drawn between healthy and faulty conditions.