Pathak, GeetaPathak, GeetaPathak, GeetaKousar JanKousar JanKousar Jan2023-02-102023-02-102022-08https://krishikosh.egranth.ac.in/handle/1/5810193616Power quality is one of the main issues in today's electrical distribution system because of the escalation in use of power electronic devices. Harmonics, voltage sag, voltage swell, power interruptions, and other problems with power quality have an impact on utility distribution networks and sensitive industrial loads. In this thesis, a three-phase DVR (Dynamic Voltage Restorer) model is developed in Matlab-Simulink to protect critical loads from voltage-related power quality problems. The detailed design of the primary system parameters, including the voltage source converter (VSC), the three-phase series injection transformer, the ripple filter (Rr, Cr), and the interfacing inductance (LT) is provided. The simulation of Synchronous Reference Frame Theory (SRFT), Instantaneous Reactive Power Theory (IRPT), Affine Projection (AP), and Affine Projection Like (APL-II) algorithm based three-phase DVR is performed and analysed under a number of source side voltage quality issues, including balanced voltage sag and swell, unbalanced voltage sag and swell, and voltage harmonic distortion. The voltage harmonic distortion is analysed for both lower and higher order harmonics. PI (Proportional Integral) controller is used to keep the DC-link voltage constant. The SPWM (Sinusoidal Pulse Width Modulation) technique is used to generate gate pulses for the VSC (Voltage Source Converter) of DVR. The comparison of stability, time response, convergence speed, and THD (Total Harmonic Distortion) for both lower and higher order harmonics is done thoroughly. These control algorithms use energy-minimized voltage compensation technique which makes the Dynamic Voltage Restorer self-supporting in nature i.e. only the capacitor is adequate at the DC-bus of the VSC, and no additional energy storage device is required.Power quality is one of the main issues in today's electrical distribution system because of the escalation in use of power electronic devices. Harmonics, voltage sag, voltage swell, power interruptions, and other problems with power quality have an impact on utility distribution networks and sensitive industrial loads. In this thesis, a three-phase DVR (Dynamic Voltage Restorer) model is developed in Matlab-Simulink to protect critical loads from voltage-related power quality problems. The detailed design of the primary system parameters, including the voltage source converter (VSC), the three-phase series injection transformer, the ripple filter (Rr, Cr), and the interfacing inductance (LT) is provided. The simulation of Synchronous Reference Frame Theory (SRFT), Instantaneous Reactive Power Theory (IRPT), Affine Projection (AP), and Affine Projection Like (APL-II) algorithm based three-phase DVR is performed and analysed under a number of source side voltage quality issues, including balanced voltage sag and swell, unbalanced voltage sag and swell, and voltage harmonic distortion. The voltage harmonic distortion is analysed for both lower and higher order harmonics. PI (Proportional Integral) controller is used to keep the DC-link voltage constant. The SPWM (Sinusoidal Pulse Width Modulation) technique is used to generate gate pulses for the VSC (Voltage Source Converter) of DVR. The comparison of stability, time response, convergence speed, and THD (Total Harmonic Distortion) for both lower and higher order harmonics is done thoroughly. These control algorithms use energy-minimized voltage compensation technique which makes the Dynamic Voltage Restorer self-supporting in nature i.e. only the capacitor is adequate at the DC-bus of the VSC, and no additional energy storage device is required.Power quality is one of the main issues in today's electrical distribution system because of the escalation in use of power electronic devices. Harmonics, voltage sag, voltage swell, power interruptions, and other problems with power quality have an impact on utility distribution networks and sensitive industrial loads. In this thesis, a three-phase DVR (Dynamic Voltage Restorer) model is developed in Matlab-Simulink to protect critical loads from voltage-related power quality problems. The detailed design of the primary system parameters, including the voltage source converter (VSC), the three-phase series injection transformer, the ripple filter (Rr, Cr), and the interfacing inductance (LT) is provided. The simulation of Synchronous Reference Frame Theory (SRFT), Instantaneous Reactive Power Theory (IRPT), Affine Projection (AP), and Affine Projection Like (APL-II) algorithm based three-phase DVR is performed and analysed under a number of source side voltage quality issues, including balanced voltage sag and swell, unbalanced voltage sag and swell, and voltage harmonic distortion. The voltage harmonic distortion is analysed for both lower and higher order harmonics. PI (Proportional Integral) controller is used to keep the DC-link voltage constant. The SPWM (Sinusoidal Pulse Width Modulation) technique is used to generate gate pulses for the VSC (Voltage Source Converter) of DVR. The comparison of stability, time response, convergence speed, and THD (Total Harmonic Distortion) for both lower and higher order harmonics is done thoroughly. These control algorithms use energy-minimized voltage compensation technique which makes the Dynamic Voltage Restorer self-supporting in nature i.e. only the capacitor is adequate at the DC-bus of the VSC, and no additional energy storage device is required.EnglishThesis