An ANFIS Regulator Integrated PQ Control of PV Array Connected Inverter for Grid Interconnection

Abstract

With the growing concern over global warming, the frequency of climate-related disasters is steadily increasing worldwide. A major contributor to this issue is environmental pollution caused by carbon emissions from non-renewable energy sources. To address this, renewable energy sources, which harness natural resources for power generation, are becoming essential. Among these, PV arrays are the most prominent, utilizing solar irradiation to generate electrical energy. In conventional PV systems, the inverter typically employs a SRF controller, which lacks the ability to regulate active and reactive power injection effectively. To overcome this limitation, the SRF controller is replaced with a PQ controller, which enables precise control over both active and reactive power flows. The PQ control strategy employs a dual-loop structure: the active power loop regulates the d-axis component, while the reactive power loop governs the q-axis component. Reference current components are generated using individual regulators, typically implemented as PI controllers. However, due to the low damping and linear characteristics of PI regulators, they are not well-suited for systems subjected to non-linear disturbances. To enhance system performance, this paper proposes replacing the conventional PI regulator with FL and ANFIS regulators. A comparative analysis is conducted, evaluating voltage profiles, power injection, and THD levels across these control strategies. The analysis identifies the most effective regulator for optimal PQ control in inverter-based PV systems.