研究目的
To propose an improved H5 transformerless inverter topology for grid-connected PV systems that enhances the utilization factor and ensures maximum power point operation with a simpler MPPT algorithm.
研究成果
The proposed improved H5 topology with a boost converter and a simple offline MPPT algorithm significantly enhances the utilization factor to nearly 100% and ensures MPPT operation, with only a slight decrease in efficiency compared to the conventional system. The algorithm is simpler than traditional methods, and the system meets leakage current standards.
研究不足
The study is based on simulations, not experimental validation. The MPPT algorithm assumes a constant temperature of 25°C, and the system may have reduced efficiency due to added boost converter losses. The offline MPPT technique may not adapt quickly to rapid changes in environmental conditions.
1：Experimental Design and Method Selection:
The study involves designing an improved H5 inverter system by integrating a boost converter between the PV panel and the H5 inverter to operate in continuous conduction mode, ensuring continuous PV current for MPPT. A new offline MPPT algorithm based on the Fractional Short Circuit Current (FCCC) method with curve-fitting is developed. Simulation is used to compare performance with conventional H5 systems.
2：Sample Selection and Data Sources:
PV array characteristics are based on datasheets, with simulations performed for different insolation levels (e.g., 50 to 1000 W/m2 at 25°C).
3：List of Experimental Equipment and Materials:
PV panels, H5 inverter, boost converter, capacitors, inductors, controllers (PI and PR), and simulation software (Matlab/Simulink).
4：Experimental Procedures and Operational Workflow:
Simulations are conducted in Matlab/Simulink to model the conventional and proposed systems, with parameters set as per Table 2. The boost converter is controlled by the MPPT algorithm, and the H5 inverter is controlled for grid synchronization and voltage regulation.
5：The boost converter is controlled by the MPPT algorithm, and the H5 inverter is controlled for grid synchronization and voltage regulation.
Data Analysis Methods:
5. Data Analysis Methods: Performance metrics such as utilization factor (Ku), efficiency, total harmonic distortion (THD), and leakage current are analyzed from simulation results using mathematical calculations and comparisons.
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