Enhancing photovoltaic grid integration with hybrid energy storage and a novel three-phase ten-switch inverter for superior power quality

Abstract

• Hybrid Energy Storage: Integrates battery and supercapacitor for stability, enabling long-term storage and rapid power response. • Power Quality Improvement: Reduces leakage currents and harmonics, enhancing PV system power quality. • Energy System Optimization: Enhances power quality for efficient PV-grid integration. • Novel H10 Inverter: Ten-switch design with SVPWM minimizes CMV fluctuations and dv / d t stresses. • Comprehensive Validation: MATLAB and experiments confirm superior performance over existing inverters. This paper introduces an innovative approach to improving power quality in grid-connected photovoltaic (PV) systems through the integration of a hybrid energy storage, combining batteries and supercapacitors and a novel three-phase ten-switch (H10) inverter. The hybrid storage system enhances the stability and responsiveness of the PV system, offering both sustained energy delivery and rapid power support. The H10 inverter, controlled by a unique space vector pulse width modulation strategy, reduces common mode voltage (CMV) fluctuations and d v / d t stresses, comparable to three-level inverters but with reduced component complexity. This configuration significantly lowers leakage currents and suppresses grid current harmonics, leading to enhanced power quality. The system’s effectiveness is validated through comprehensive MATLAB simulations and experimental results, demonstrating its superiority over existing inverter topologies in reducing CMV and leakage currents while improving overall PV system performance.