In this Modeling and Analysis of SVPWM Based Dynamic Voltage Restorer report the modeling and analysis of Space Vector Pulse Width Modulation (SVPWM) based Dynamic Voltage Restorer (DVR) using PSCAD/EMTDC software will be presented in details. The simulation includes full modeling of the SVPWM technique used to control the DVR inverter. A test power system composed of three phase voltage source, sag generator, DVR and three phase resistive load is used to demonstrate restoration capability of the DVR. The simulation results of the presented DVR proved excellent voltage sag mitigation to protect sensitive loads.
Dynamic Voltage Restorer (DVR) is one of the most important mitigation equipment for voltage sag in both medium voltage and distribution levels. Base on the idea of using DC storage and voltage source converter (VSC) to inject series voltage for sag mitigation. Recent improvements in fast switching power devices have led to an increased interest in VSC with Pulse Width Modulation (PWM) techniques. Space Vector Pulse Width Modulation (SVPWM) technique is widely adopted due to its simple and effective digital implementation. The theory of SVPWM with several modes of operation is presented in this report. SVPWM technique introduces reduced commutation losses, lower harmonics and better utilization of the DC voltage compared to other PWM techniques. The restoration capability of the DVR is one of the most with most important issues to evaluate a DVR. Different sag levels will be applied to the simulated system to test the restoration capability of the DVR.
Modeling and Analysis of SVPWM Based Dynamic Voltage Restorer Conclusion:
In this report a detailed model describing the operation of dynamic voltage restorer was built in PSCAD/EMTDC environment. The simulation model facilitates analyzing the performance of DVR during different operating conditions. The DVR effectiveness in voltage sags compensation up to the designed sag level makes it an interesting power quality device compared to other custom power devices. The results of the PSCAD/EMTDC simulation also verify the presented control algorithm based on SVPWM technique to generate the necessary switching pulses for the DVR inverter in order to generate the proper injected voltage for voltage sag mitigating.
Download Modeling and Analysis of SVPWM Based Dynamic Voltage Restorer.