MATLAB Implementation of Three-Phase Solar PV Integrated UPQC
Introduction
We explore the design and performance analysis of a Three-Phase Solar PV Integrated Unified Power Quality Conditioner (UPQC). The UPQC is utilized to mitigate voltage sag and swell issues in power systems connected to nonlinear and unbalanced loads.
Overview of the System
Solar PV and UPQC Integration: The setup integrates a solar PV system with series and shunt compensators. This configuration addresses power quality issues by maintaining a stable voltage at the load side while compensating for disturbances on the source side.
System Structure
Components: The system includes the solar PV array connected through a filter inductor to the grid, along with series and shunt compensators. The series compensator handles voltage sags and swells, while the shunt compensator addresses reactive power issues.
Control Logic for Compensation
Shunt Compensation: Utilizing a Maximum Power Point Tracking (MPPT) algorithm, the shunt compensator regulates the reactive power and balances the load current. The control logic involves measuring load current and converting it into a suitable reference frame for effective compensation.
Series Compensation: The series compensator operates by measuring both load and grid voltages, converting them into the direct-quadrature (DQ) reference frame, and then injecting the required voltage to mitigate any voltage sag or swell.
Simulation Model
Inputs and Outputs: The simulation uses solar radiation and temperature inputs to model the solar PV system. The control logic continuously monitors load conditions and adjusts the output to maintain a consistent voltage at the load.
Performance Analysis
Dynamic Response: The system is tested under various conditions, including unbalanced loads and voltage sags. The results show that the UPQC effectively maintains sinusoidal source currents and keeps the load voltage at one per unit, demonstrating its capability to mitigate power quality issues.
Conclusion
This MATLAB implementation of the Three-Phase Solar PV Integrated UPQC successfully addresses critical power quality challenges. The system ensures a stable and reliable power supply in the presence of nonlinear and unbalanced loads, showcasing the benefits of integrating renewable energy sources with advanced power quality solutions.
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