Abstract
The integration of renewable energy sources such as solar and wind into the power grid requires efficient and reliable power conversion systems. The article presents the design, development, and production of a high-efficiency multi-level DC-AC inverter tailored for solar and wind power plants. The proposed inverter architecture employs a cascaded H-bridge topology, which enhances output waveform quality, reduces total harmonic distortion (THD), and minimizes the need for bulky filters. Advanced pulse-width modulation (PWM) techniques and digital control algorithms are implemented to achieve precise voltage regulation and dynamic response under variable renewable energy conditions. The system is designed to maximize energy conversion efficiency while maintaining operational stability and scalability. Prototyping and testing under laboratory and field conditions demonstrate energy efficiency exceeding 96%, with robust performance in hybrid renewable setups. This work contributes to the growing need for sustainable power electronics solutions by providing a scalable and efficient inverter platform suited for utility-scale renewable energy applications