研究目的
Investigating the performance of a new H2D4-type transformer-less inverter for grid-tied PV systems, focusing on reducing leakage current, maintaining low THD, and controlling reactive power to achieve a high power factor.
研究成果
The proposed H2D4 transformer-less inverter topology with PI and PLL control systems effectively reduces leakage current, maintains low THD, and achieves a high power factor, making it suitable for single-phase grid-connected PV systems. The topology's efficiency and reduced conduction losses due to fewer IGBT switches are highlighted.
研究不足
The study is based on simulation results, which may not fully capture real-world operational challenges. The proposed topology's performance in varying environmental conditions and its scalability for larger systems are not addressed.
1：Experimental Design and Method Selection:
The study proposes a new H2D4-type transformer-less inverter topology with two control systems (PI and PI+PLL) for reactive power control. The methodology includes theoretical analysis and simulation in MATLAB/Simulink to validate the design.
2：Sample Selection and Data Sources:
The study compares the proposed H2D4 topology with conventional NPC and H6 topologies using simulation parameters specified in Table I.
3：List of Experimental Equipment and Materials:
The simulation uses parameters such as input voltage (400VDC), frequency (50Hz), rated power (2kW), and components like IGBT switches, diodes, and a 4th order Butterworth filter.
4：Experimental Procedures and Operational Workflow:
The study outlines four operational modes of the H2D4 inverter and describes the control systems' operation for generating SPWM signals for the switches.
5：Data Analysis Methods:
The analysis focuses on THD and power factor measurements from the simulation results to compare the performance of the proposed and conventional topologies.
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