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Grid Connected PV system with Zeta Converter in MATLAB

Grid Connected PV system with Zeta Converter in MATLAB


Overview of the PV System

The PV system comprises a series of PV arrays, each consisting of 10 series modules, totaling 47 parallel strings. Each panel has a maximum power of 213.15 watts, with a voltage and current at the maximum power point of 29 volts and 7.35 amps, respectively. The system can supply a maximum power of up to 100.2 kilowatts.

Role of the Zeta Converter

The Zeta converter plays a crucial role in stepping up the voltage from the PV panels to match the required voltage level for the grid. With the grid operating at 400 volts and 50 hertz, the Zeta converter boosts the voltage from 290 volts to around 600 volts.

Designing the Zeta Converter

Designing the Zeta converter involves calculating the values of inductors (L1, L2) and capacitors (C1) based on specified equations. These components are critical for the efficient operation of the Zeta converter.

Implementing MPPT Algorithm

The Maximum Power Point Tracking (MPPT) algorithm is essential for extracting the maximum power from the PV panels while adjusting the duty cycle of the Zeta converter. Incremental Conductance MPPT is employed, which continuously adjusts the duty cycle based on changes in PV voltage and current.

DC-DC and DC-AC Conversion

The Zeta converter facilitates the initial DC-DC conversion, followed by a DC-AC conversion using an inverter. Voltage and current control concepts are applied to ensure smooth power transfer from the PV panels to the grid.

Voltage and Current Control

Voltage control involves maintaining the desired grid voltage by comparing it with a reference voltage and adjusting the duty cycle of the Zeta converter accordingly. Current control ensures that the inverter sends only real power to the grid by generating reference currents based on grid conditions.

Results and Analysis

Simulation results demonstrate the effectiveness of the Zeta converter in maintaining grid power and voltage levels across varying irradiation conditions. The grid current waveform remains sinusoidal, indicating stable power transfer. Additionally, the Total Harmonic Distortion (THD) of the grid current remains below 5%, signifying low harmonic distortion.

Conclusion

Group-connected PV systems with Zeta converters offer a reliable and efficient solution for integrating solar power into the grid. By effectively managing voltage levels and maximizing power extraction from PV panels, these systems contribute to sustainable energy production. Thank you for exploring the intricacies of this innovative technology with us. Subscribe to our channel for more updates and insights into renewable energy solutions.


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