研究目的
To propose a new topology for a single-phase grid-tie two-stage DC-AC boost inverter for PV systems that utilize high-frequency transformer for galvanic isolation, aiming to increase the inverter output voltage level, achieve MPPT, and ensure high reliability, small size, and lightweight.
研究成果
The proposed single-stage high-frequency boost inverter cascaded by a rectifier-inverter system effectively interfaces PV modules with the grid, providing voltage boosting, MPPT, and galvanic isolation. Simulation and experimental results validate the topology's performance, demonstrating its potential for PV grid-tie applications.
研究不足
The study focuses on a single-phase system and uses a resistive load in place of the grid for experimental validation, which may not fully represent grid-connected conditions. The high-frequency operation may introduce challenges in terms of switching losses and electromagnetic interference.
1：Experimental Design and Method Selection:
The study involves the design of a two-stage DC-AC boost inverter system for PV applications, incorporating a high-frequency transformer for galvanic isolation. The first stage is a high-frequency boost inverter (HFBI) for voltage boosting and MPPT, and the second stage is a rectifier-inverter system (RIS) for grid connection.
2：Sample Selection and Data Sources:
A 250W PV module is simulated under specific conditions (25°C temperature and 1000W/m2 radiation), and a 200-W experimental prototype is tested in the laboratory.
3：List of Experimental Equipment and Materials:
Includes HFBI inductors, HFBI filter capacitor, HFBI filter inductor, DC link capacitor, grid filter inductor, and PV module characteristics.
4：Experimental Procedures and Operational Workflow:
The system is simulated using PSIM software and experimentally validated with a laboratory prototype. The HFBI switches are modulated for MPPT, and the RIS is controlled for grid current injection.
5：Data Analysis Methods:
The performance is evaluated based on the THD of the grid current, voltage levels, and power efficiency.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
