30 MW Grid Connected PV System in MATLAB
Welcome to LMS Solution! In this blog post, we will explore the MATLAB implementation of a 30-megawatt grid-connected photovoltaic (PV) system. This simulation model includes a 30 MW PV array connected to a three-phase inverter via a boost converter, with the inverter linked to an 11-kilovolt grid. We'll delve into the design considerations for the boost converter, the operation of the maximum power point tracking (MPPT) algorithm, and the control strategies for the inverter.
Boost Converter Design
The boost converter is a crucial component designed based on the power rating of the PV array, the terminal voltage of the PV array, and the voltage requirements for the inverter input. During the design, factors such as switching frequency, ripple inductor current, and ripple capacitor voltage are carefully considered. This converter serves to elevate the PV voltage to meet the requirements for the inverter input.
Maximum Power Point Tracking (MPPT) Algorithm
To extract the maximum power from the PV array, an MPPT algorithm is employed. The Perturb and Observe (P&O) algorithm is used in this case. The algorithm continuously adjusts the duty cycle of the boost converter based on the voltage and power measurements from the PV array, ensuring optimal power generation.
DC to AC Conversion
The DC power generated by the PV array is then converted to AC power using a three-phase inverter. The inverter is controlled using voltage and current control methods. The voltage control aims to maintain the DC link voltage constant, while the current control is responsible for converting DC power to AC power, ensuring only real power is sent to the grid.
Simulation and Irradiation Variation
The simulation involves varying irradiation conditions to observe the system's response. Irradiation levels change from 1000 to 800 watts per square meter, affecting the PV array's power output. The results include the PV power, grid power, inverter power, and current waveforms under changing irradiation conditions.
A harmonic analysis is performed to evaluate the system's harmonic distortion under varying irradiation. The Total Harmonic Distortion (THD) of the grid current is analyzed, ensuring it remains within acceptable limits as per standards.
In conclusion, the MATLAB simulation demonstrates the effective operation of a 30 MW grid-connected PV system. The boost converter efficiently elevates the PV voltage, the MPPT algorithm maximizes power extraction, and the inverter control methods ensure grid compatibility. Harmonic analysis confirms the system's adherence to quality standards, making it a reliable and efficient renewable energy source.