研究目的
To develop a robust nonlinear continuous-time controller for a three-phase single-stage grid-connected PV system to ensure operation at maximum power point with unity power factor and low harmonic distortion.
研究成果
The proposed backstepping controller effectively achieves maximum power point tracking and unity power factor with low harmonic distortion in a three-phase grid-connected PV system. The use of an LCL-filter significantly reduces harmonics compared to an L-filter, meeting standards. Simulation results confirm robust performance under transient conditions, demonstrating the controller's accuracy and stability.
研究不足
The study is based on simulation results only, without experimental validation. The controller requires more computation due to its nonlinear nature, and parameters are selected via trial-and-error, which may not be optimal. The system is tested under specific climate changes and may not cover all real-world conditions.
1：Experimental Design and Method Selection:
The study uses a simulation-based approach in Matlab/Simulink environment to model and control a three-phase grid-connected PV system with an LCL-filter. A backstepping control strategy is developed in the synchronous dq-frame, with grid synchronization via a three-phase PLL and stability analysis using Lyapunov methods.
2：Sample Selection and Data Sources:
The PV system is modeled using a Siemens SM55 solar panel, with a generator formed by 33 panels in series. Climate changes (solar irradiation and temperature variations) are simulated to test performance under transient conditions.
3：List of Experimental Equipment and Materials:
The system includes a photovoltaic array, three-phase PWM inverter, LCL-filter, DC bus capacitor, and grid connection. Specific parameters are provided in Table III of the paper.
4：Experimental Procedures and Operational Workflow:
The simulation involves setting up the system model, applying the backstepping controller, and testing under varying solar irradiation (1000W/m2 to 800W/m2 and back) and temperature (25°C to 45°C and back). Data on power, voltage, currents, and harmonic distortion are collected and analyzed.
5：Data Analysis Methods:
Performance is evaluated through simulation results, including tracking of maximum power points, unity power factor achievement, and harmonic analysis using Total Harmonic Distortion (THD) calculations.
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