Modelling of Dynamic Voltage Restorer against Balanced and Unbalanced Voltage Sags in Distribution systems

Abstract

The Dynamic Voltage Restorer (DVR) is used to regulate the voltage at the load terminals from various power quality problems like sag, swell, harmonics, unbalance etc. in supply voltage. This paper presents modelling aspects of several types of Dynamic Voltage Restorer (DVR) working against various voltage sags by simulation. Dynamic voltage restorers (DVRs) are used to protect sensitive loads from the effects of voltage sags on the distribution feeder. Significant simulation results show that these several types of the modelled device can work very well against balanced and/or unbalanced voltages caused by faults in a distribution system. Detailed analyses illustrate that with suitable parameter setting these devices can deal with different levels of voltage sag severity. In addition, appropriate ways to obtain a good quality output voltage by a DVR during voltage sag is also presented. It then provides analyses of working performance of the device, including capability and quality of compensation.

Influence of the DVR on the Transient Response of Wind Farms against Voltage Sags

“…In the last years, has been studied the use of the DVR in wind power systems to meet the requirements of the increasingly restrictive conditions in grid integration codes [29][30][31][32][33].…”

Performance of Distributed Generation (DG) towards Dynamic Voltage Restorer (DVR) in Mitigating Voltage Dips

“…A voltage dip is happen usually because by a fault in the utility system, a fault or a large increase of the load current, like starting an induced motor or energizing of the transformer. Typical faults are single-phase that means single phase to ground or multiple-phase which means phase to phase short circuits [1,2]. The sensitive loads is very demand with this problem of voltage dip phenomena because the sensitive loads such as the controller, variable speed drive at the semiconductor manufacturing place at the industry and computer system can give the bad impact to this equipment.…”