Hybrid EMI Mitigation in PV Systems

Photovoltaic (PV) inverter systems play a crucial role in renewable energy applications. Nevertheless, their rapid switching activity frequently produces unwanted electromagnetic interference (EMI), which diminishes performance and leads to non-compliance with electromagnetic compatibility (EMC) regulations. This study suggests a hybrid method for EMI reduction that integrates Spread Spectrum Pulse Width Modulation (SSPWM) with an RC snubber circuit. SSPWM distributes the spectral energy of switching harmonics across a broader frequency range, thus reducing the intensity of EMI peaks. The RC snubber circuit, conversely, captures transient energy and minimizes voltage spikes resulting from switching transitions. Analysis through simulation and experimentation was performed for four scenarios traditional PWM, SSPWM, RC snubber, and the hybrid setup. The comparative findings indicate that the hybrid method achieves considerable EMI reduction, lessening both the amplitude of high-frequency noise and the strength of narrowband spikes. This approach is straightforward, cost-effective, and works well with current inverter designs.