Enhancing Power Quality using a Dynamic Voltage Restorer (DVR) with PI Controller

Abstract: Nowadays, many people are shifting and adapting to the renewable energy sources like wind and solar which are free of cost and easily available to us. But shifting to the renewable energy sources comes with some problems, and we need to focus on those problems. So the power quality is the main problem in this power system and maintaining it consistently time to time. Some situations like voltage sags, voltage swells, harmonic content and so on has major effect on load side. To overcome this problems custom power devices like Dynamic Voltage Restorer(DVR), Distribution Static Compensator are used in power distribution networks. From this custom devices I picked the Dynamic Voltage Restorer(DVR) for my project. The Dynamic Voltage Restorer has much quality like fast flexible and efficient solutions to the voltage sag and swell problems. The DVR works by injecting the voltage in series and synchronize with the standard voltage ensuring a stable power supply. It continuously monitors the standard voltage and if any deviations occur it quickly injects are decreases the voltage keeping the power supply stable. The important parts of the DVR are voltage source inverter(VSI), boost transformer, filter and DC energy source (Solar energy, Wind energy, Battery).This DVR has an excellent performance in protecting the critical load from voltage sag and swell problems.So that’s why I am going with this custom device. By using this I will compensate the voltage fluctuations and instability in the power distribution networks