研究目的
Investigating the control strategy for a two-stage neutral point clamped (NPC) three-level photovoltaic inverter system to achieve maximum power point tracking (MPPT) and grid-connected operation with high efficiency and low harmonic distortion.
研究成果
The system demonstrates effective MPPT tracking and grid-connected operation with SVPWM control based on a 60° coordinate system. It achieves fast dynamic response, low harmonic distortion, and operates at a unit power factor, indicating high grid-connected performance.
研究不足
The complexity of the two-stage NPC three-level photovoltaic inverter system may introduce challenges in implementation and optimization. The study focuses on simulation and a specific hardware setup, which may limit generalizability.
1：Experimental Design and Method Selection:
The study employs a two-stage NPC three-level photovoltaic inverter system, utilizing SVPWM control under a 60° coordinate system for the back-stage DC/AC conversion. The front-stage involves Boost and MPPT tracking.
2：Sample Selection and Data Sources:
Photovoltaic cells from a company are used, with specific technical parameters provided.
3：List of Experimental Equipment and Materials:
Includes DSP+FPGA control chips, IGBT from Mitsubishi Group, and Matlab/Simulink for simulation.
4：Experimental Procedures and Operational Workflow:
The simulation involves setting up MPPT and SVPWM control models, followed by hardware platform testing with DSP+FPGA.
5：Data Analysis Methods:
Simulation results are analyzed for output characteristics, MPPT effectiveness, and grid-connected performance metrics like THD and power factor.
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