This project demonstrates the DC bus voltage ripple computational method leveraging AC error voltage vector information, independent of instantaneous current data, making it an offline model. The method enables the evaluation of PWM techniques for minimizing voltage ripple. Results show that the proposed sequencing PWM generates minimum voltage ripple compared to conventional, confirmed by RMS voltage ripple computations across various modulations and load conditions. Additionally, the proposed PWM reduces DC capacitor size by 35% compared to conventional for a target DC voltage ripple at ma = 0.6 and δ = 60°, highlighting its effectiveness in optimizing inverter performance. 

This project introduces an innovative smart solar water pumping system, revolutionizing traditional rural irrigation methods. Unlike conventional systems using grid-powered three-phase or single-phase motors, this design employs a single-phase capacitor-less induction motor controlled via a three-leg inverter. At the heart of the system is the Remote Irrigation Energy Management System (RIEMS) box, a breakthrough solution developed by the inventor. RIEMS seamlessly connects the user application (APP) with the inverter control, enabling remote pump operation. Through a user-friendly APP interface, farmers can remotely monitor and regulate the pump, enhancing efficiency and transforming irrigation management for improved sustainability. 

In this project, filter-based discontinuous PWM (DPWM) technique is proposed for three-phase, two-level grid-connected inverters, specifically for 60° clamping PWMs, which involve sudden transitions between clamping and non-clamping regions. The DC capacitor current and DC voltage ripple are mathematically modeled based on grid and inverter parameters. Comparative analysis with conventional DPWM reveals that the proposed filtered DPWM reduces DC bus voltage and source current ripple by 46%. The filter time constant is optimized, balancing ripple reduction with the closed-loop system phase margin. This approach demonstrates improved performance, ensuring enhanced stability and reduced ripple in grid-connected inverter applications. 

This Project demonstrate the effectiveness of a series solar inverter configuration in simultaneously compensating nonlinear load harmonics and injecting active power. Operating at half the pole voltage and double the switching frequency, the series inverter reduces filter size requirements by eight times compared to a parallel inverter. The doubled system bandwidth enables extended harmonic compensation, significantly lowering grid current %THD. Experimental validation under various conditions—symmetrical/asymmetrical solar power changes (DC side) and different loads (AC side)—confirms its performance. The proposed configuration efficiently shapes harmonics, ensuring grid current %THD complies with IEEE-519 standards in real-time conditions.