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* Dated: 27-July-2023
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Download the Zip file of the project from my GitHub link is bellow:
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*******Description of the project*******
TITLE:
MATLAB Simulink Model for the Power Quality (PQ) Mitigation of Voltage Sag using a Dynamic Voltage Restorer (DVR)
INTRODUCTION:
The quality of electrical power supply is of paramount importance in ensuring the seamless operation of various electrical and electronic devices. However, power systems are often susceptible to disturbances, such as voltage sags, which can lead to momentary drops in voltage levels. These voltage sags can have detrimental effects on sensitive equipment, causing malfunctions and disruptions.
In recent years, significant advancements have been made in developing power electronic devices to address power quality issues and mitigate voltage sags effectively. One such innovative solution is the Dynamic Voltage Restorer (DVR). The DVR is a fast-acting voltage compensation device that dynamically injects voltage into the power system during sags, restoring the voltage to its nominal level and safeguarding connected equipment from any adverse impacts.
This project aims to design and implement a MATLAB Simulink model for the Power Quality (PQ) mitigation of voltage sag using a DVR. Through this simulation, we will explore the functionality and effectiveness of the DVR in compensating for voltage sags and enhancing power system stability. The model will allow us to analyze the performance of the DVR under different operating conditions and assess its capability in mitigating voltage sags in real-time.
By developing and evaluating this MATLAB Simulink model, we seek to contribute to the understanding and advancement of power quality improvement techniques, which are crucial in ensuring reliable and uninterrupted power supply in various industries and applications. Moreover, this research will pave the way for future developments in power electronics and grid resilience, ultimately benefiting both industrial and residential consumers.
WORKING:
The model uses a DLG fault (double line-to-ground fault) to cause the voltage sag. The fault is applied at 0.03 seconds and cleared at 0.07 seconds. The DVR is activated at 0.03 seconds and remains active until 0.07 seconds. The simulation time is 0.1 seconds.
The PI controller in the DVR is used to track the voltage waveform at the load. The controller output is used to control the voltage waveform injected by the DVR.
RESULT ANALYSIS:
The results of the simulation show that the DVR is able to successfully mitigate the voltage sag. The voltage waveform at the load remains relatively constant during the fault, and the current waveform does not show any significant spikes.
The DVR is able to mitigate the voltage sag because it injects a compensating voltage that is equal in magnitude and opposite in phase to the voltage sag. This compensating voltage effectively cancels out the voltage sag, resulting in a smooth and stable voltage waveform at the load.
The performance of the DVR is affected by the controller gains. The controller gains determine how quickly the DVR responds to the voltage sag. If the controller gains are too high, the DVR may oscillate around the desired voltage. If the controller gains are too low, the DVR may not be able to respond to the voltage sag quickly enough.
In the simulation, the controller gains are set to 10 and 0.1. These gains provide a good balance between performance and stability. The DVR is able to respond to the voltage sag quickly without oscillating around the desired voltage.
The MATLAB Simulink model is a simple and effective demonstration of how a DVR can be used to mitigate voltage sags. The model can be used to study the performance of different DVR controllers and to evaluate the effectiveness of DVRs for different types of loads.
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