Sag and harmonics control for solar PV system integrated to grid using Crosslink Harmonizer Integrator

Abstract This paper described a novel strategy for mitigation of voltage sag and harmonic using Crosslink Harmonizer Integrator (CHI) filter for solar PV system integration to grid. The proposed system, based on a double-stage 3-phase topology, addresses the challenges of ensuring power quality during abnormal grid conditions while enhancing the operational versatility of the PV system. Under typical operating circumstances, no reactive power is sent to the grid; instead, power is delivered to the grid at a Unity Power Factor (UPF). However, during grid voltage variations, the control technique dynamically adjusts the voltage at the Point of Common Coupling (PCC) to maintain it within specified limits. This is achieved by injecting or absorbing reactive power as needed. The Voltage Source Converter (VSC) and DC link capacitor work as a Distributed Static Synchronous Compensator (DSTATCOM) to optimize system use at times when PV generation does not occur, such as at night. However, this method preserves power quality far better than conventional control methods. MATLAB simulation is used to confirm the effectiveness of the proposed control mechanism. Both simulation and hardware implementation (OPAL-RT OP4510 real time simulator) are used for illustrating the control’s achievements.