研究目的
To control the power that the inverter injects into the grid from the energy provided by the photovoltaic generator, ensuring the power quality injected into the grid and the performance of the converter system.
研究成果
The digital control system of the single phase inverter connected to the grid improves the efficiency of photovoltaic systems. The proposed control technique, based on DSPWM and feed forward technique, has been validated through simulations and experimental results, demonstrating its viability and the simplicity of digital implementation.
研究不足
The noise in the inverter output current signal due to the use of the grid signal sample for generating and synchronizing the reference current with the grid signal.
1：Experimental Design and Method Selection:
The control technique is based on digital pulse-width modulation (DSPWM) for synchronizing a sinusoidal output current with a grid voltage and controlling the power factor. It involves single phase inverter controlled by bipolar PWM Switching and lineal current control.
2：Sample Selection and Data Sources:
The system includes a photovoltaic generator, a maximum power point tracker (MPPT), and a single-phase inverter connected to the grid.
3：List of Experimental Equipment and Materials:
The system components include a DC/DC converter, an H-bridge inverter, coupling inductance, and a Field-Programmable Gate Array (FPGA) for digital control implementation.
4：Experimental Procedures and Operational Workflow:
The control strategy involves two control loops: an external control loop for DC voltage and an internal control loop for current to control the power injected into the grid. The digital implementation of the control is done using VHDL on an FPGA.
5：Data Analysis Methods:
Simulation results of output voltage and current are used to validate the control method. Experimental results from a prototype are also presented.
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