研究目的
To implement Pulse Width Modulation (PWM) techniques and investigate the effect of switching frequency on Total Harmonic Distortion (THD), and propose a control method of switching frequency selection in order to maintain THD within the standard requirement during solar irradiance changing.
研究成果
The research concluded that CPWM has better performance in terms of THD and switching losses compared to DPWM at selected switching frequencies. A suitable control method using CPWM and appropriate switching frequency values was proposed to maintain THD within standard requirements during various irradiance levels.
研究不足
The study found that at very low solar irradiance levels (200 W/m2), THD levels could not be reduced below 5% for both CPWM and DPWM, indicating a limitation in the effectiveness of the proposed method under such conditions.
1：Experimental Design and Method Selection:
The study implemented Continuous Pulse Width Modulation (CPWM) and Discontinuous PWM (DPWM) techniques in the inverter control of the GC-PV system using MATLAB/Simulink environment to investigate the effect of switching frequency on THD at different levels of solar irradiance.
2：Sample Selection and Data Sources:
The system was tested at solar irradiance levels of 1000 W/m2, 800 W/m2, 600 W/m2, 400 W/m2, and 200 W/m2, with the temperature kept constant at 25 oC.
3：List of Experimental Equipment and Materials:
The GC-PV system model includes a PV array, dc-link capacitor, three-phase two-level IGBT inverter with PWM control, and a three-phase transformer to connect the inverter to the utility grid.
4：Experimental Procedures and Operational Workflow:
The switching frequency of the carrier signal was adjusted based on the solar irradiance range to maintain THD within the standard requirement.
5：Data Analysis Methods:
Fast Fourier Transform (FFT) analysis was used to obtain the THD of CPWM and DPWM at different levels of irradiance.
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