研究目的
Proposing a new H-bridge clamped transformerless inverter for grid-connected Photovoltaic (PV) application to achieve high efficiency and low leakage current with constant common mode voltage (CMV).
研究成果
The proposed HB-ZVSCR inverter topology demonstrates high efficiency (97.74% at full load) and effectively reduces common mode and leakage current effects. It is suitable for grid-connected PV systems, offering pure sinusoidal output voltage and current waveforms.
研究不足
The study focuses on a specific topology and its comparison with existing mid-point clamping topologies. The experimental validation is limited to a 500 W system.
1：Experimental Design and Method Selection:
The proposed topology is analyzed through simulation and experimental validation using PLECS software. Thermal modeling is presented for loss calculation.
2：Sample Selection and Data Sources:
Parameters used for simulation and experiment include input voltage, resistive load, resistive-inductive load, output voltage, line frequency, output current, modulation index, rated power, switching frequency, DC bus capacitor, filter capacitor, filter inductor, switches, diodes, and controller.
3：List of Experimental Equipment and Materials:
Components include SiC power switches and diodes, individual heatsinks, gate drive circuits, and an sb-RIO GPIC controller from National Instrument (NI).
4：Experimental Procedures and Operational Workflow:
The operation of the proposed inverter is analyzed through four operational modes, with simulations carried out before experimental verification.
5：Data Analysis Methods:
Efficiency is calculated considering the rated output power, and losses in different parts of the inverter are analyzed.
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