H4 Bridge Photovoltaic Grid-Tied Inverter Dual-Loop Voltage and Current Simulation

The H4 bridge serves as a fundamental power conversion component in electrical engineering systems, particularly crucial for photovoltaic grid-tied inverters that transform DC power generated by solar panels into grid-compatible AC power. This simulation model implements a sophisticated dual-loop control architecture comprising both voltage and current regulation loops. The outer voltage loop typically maintains stable DC-link voltage using PI controllers, while the inner current loop ensures precise grid synchronization through techniques like phase-locked loops (PLL) and sinusoidal pulse width modulation (SPWM). Key implementation aspects include: - Voltage loop algorithm calculating reference currents based on DC bus voltage error - Current control loop employing dq-axis transformation for decoupled active/reactive power regulation - PWM generation module implementing carrier-based modulation with dead-time compensation - Grid synchronization using enhanced PLL algorithms for frequency and phase tracking Engineers can utilize this model to optimize H4 bridge switching characteristics, minimize harmonic distortion, and improve overall inverter efficiency through parameter tuning and control strategy validation. The research contributes significantly to advancing renewable energy integration by enabling more stable and efficient power conversion systems, ultimately supporting global transition toward sustainable energy infrastructure.