研究目的
To develop an efficient power conditioning unit for a single-stage single-phase grid-connected photovoltaic system that incorporates both maximum power-point tracking and current control algorithms using modified p-q theory to independently control active and reactive power sharing between the PV system and the grid.
研究成果
The proposed control technique effectively regulates active and reactive power sharing in a single-stage single-phase grid-connected PV system, demonstrating enhanced stability and faster response under varying conditions. It offers advantages such as reduced complexity, no need for phase-locked-loop (PLL), and easier digital implementation compared to conventional methods. Future work could focus on extending the approach to three-phase systems and optimizing for higher power applications.
研究不足
The hysteresis band current controller causes variable switching frequency, which may lead to increased electromagnetic interference. The system's performance is validated under specific conditions and may require further testing for broader applicability. The use of a single-phase system limits scalability to three-phase applications without modifications.
1：Experimental Design and Method Selection:
The study uses a single-stage H-bridge inverter as the power electronic device for DC to AC conversion, integrating MPPT and power control. Modified p-q theory is applied to derive reference current for hysteresis band current (HBC) control, and incremental conductance (IncCond) method with variable step-size is used for MPPT.
2：Sample Selection and Data Sources:
A
3：8 kW PV array composed of Kyocera KD205GX-LP modules is used, with simulations in MATLAB/Simulink and experimental setup with specific components. List of Experimental Equipment and Materials:
Includes PV modules, H-bridge inverter, storage capacitor, LC filter, grid-connecting reactor, FPGA for digital control, MOSFETs, opto-couplers, and other electronic components as detailed in Table I.
4：Experimental Procedures and Operational Workflow:
Simulations and experiments are conducted under varying solar insolation, temperature, and load conditions to validate power sharing and controller performance. The HBC controller generates PWM pulses based on error signals from reference and actual currents.
5：Data Analysis Methods:
Performance is evaluated through power measurements, efficiency calculations, total harmonic distortion (THD) analysis, and comparison with proportional resonant (PR) controller.
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