A HYBRID GRID-CONNECTED TRANSFORMERLESS PHOTOVOLTAIC INVERTER WITH REDUCED COMMON-MODE LEAKAGE CURRENT AND INTELLIGENT POWER CONTROL

Abstract

Transformerless photovoltaic (PV) gridconnected inverters have gained significant attention due to their high efficiency, reduced size, lower cost, and improved power density. However, the absence of galvanic isolation introduces commonmode leakage currents, which can degrade power quality, increase electromagnetic interference (EMI), and compromise system safety. Furthermore, modern grid codes require PV inverters to provide reactive power support for voltage regulation and grid stability. This paper proposes a hybrid single-phase transformer less solar PV grid-connected inverter with reactive power capability and reduced leakage current using an Adaptive NeuroFuzzy Inference System (ANFIS) controller. The proposed topology combines a modified H-bridge inverter structure with advanced common-mode voltage suppression techniques to minimize leakage current while maintaining high conversion efficiency. The ANFIS controller ensures accurate active and reactive power control under varying solar irradiance and load conditions. MATLAB/Simulink results demonstrate significant improvements in leakage current reduction, power quality, dynamic response, and overall system efficiency compared to conventional transformerless inverter configurations.