Fault Voltage Ride-Through Technology Implementation of Grid-Connected Photovoltaic Inverter on CloudPSS Platform

Abstract

In this paper, a fault voltage ride-through control strategy is developed for the grid-connected photovoltaic (PV) inverters. In this control strategy, a new phase-locked loop (PLL) is proposed to realize the grid voltage tracking under zero-voltage and unbalanced voltage faults. By detecting the voltage amplitude of the point of common coupling (PCC), the grid-connected PV inverter can switch its control strategy to realize the fault voltage ride-through, and inject a certain amount of reactive current to support the voltage recovery of the power grid. The CloudPSS is used to build an electromagnetic transient (EMT) simulation platform of the fault ride-through test system, and the simulation results prove the effectiveness of the proposed control strategy.