Innovative Coordination Control Approach for Enhancing Grid-Connected Inverters' Resilience to Voltage Unbalance

Abstract

Voltage unbalance in electrical grids presents a substantial challenge that directly impacts the operational efficiency and reliability of grid-connected inverters, which are integral for the seamless integration of renewable energy resources. In response to this issue, this paper develops a sophisticated coordinated control strategy that harnesses the dynamic synchronization capabilities of the d-q rotating coordinate system, specifically designed to counteract grid fluctuations. This innovative approach facilitates the meticulous regulation of both active and reactive power through a synergistic integration of advanced power management techniques and adaptive tuning mechanisms, thereby significantly enhancing the system's responsiveness and overall reliability. The strategy's effectiveness in substantially improving the fault ride-through capabilities of grid-connected inverters, even under conditions of marked voltage unbalance, is rigorously validated through a series of comprehensive experimental procedures. The findings represent a pivotal advancement in the field, underscoring the novel application of dynamic synchronization techniques within the context of grid-connected inverters. By offering an advanced control solution that markedly improves the resilience and stability of grid-connected inverters, this work makes a significant contribution to the existing body of knowledge, addressing a critical gap in the literature and paving the way for future research in this area. The implications of this study are far-reaching, providing a robust framework for enhancing the integration of renewable energy sources into the power grid, thereby supporting the global transition towards sustainable energy systems.