研究目的
To design a one-phase inverter using the Third Harmonic Injection Pulse Width Modulation (THIPWM) method for mini-grid photovoltaic applications, aiming to convert DC voltage to AC voltage efficiently.
研究成果
The THIPWM method inverter design was capable of converting DC to AC voltage with a maximum error of 3.12% in output voltage measurements. However, the system's performance was limited to a maximum load of 40 watts due to voltage source limitations.
研究不足
The system could only load up to 40 watts effectively; loading beyond this caused the inverter voltage source to decrease below the required 267 Volts, limiting the output voltage to below 220 Volts.
1：Experimental Design and Method Selection:
The study employed the THIPWM method implanted into an Arduino Uno microcontroller for inverter control. The reference signal was formed using the sum of sinusoidal waves with the third harmonic wave.
2：Sample Selection and Data Sources:
The design specifications included an output power of 250 W, input voltage of 267 VDC, switching frequency of 10 kHz, output voltage of 220 VRMS, and output frequency of 50 Hz.
3：List of Experimental Equipment and Materials:
Components included an Arduino Uno microcontroller, MOSFETs, LC filter, and PSIM software for simulation.
4：Experimental Procedures and Operational Workflow:
The process involved simulation design using PSIM, hardware design with Arduino microcontroller for pulse generation, MOSFET driver testing, and inverter testing with and without LC filters.
5：Data Analysis Methods:
The output voltage and power capacity were measured and compared with theoretical calculations to determine error margins.
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