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Since Microgrid located downstream in distribution network, voltage sags caused by short circuit have become common power quality events that users of Microgrid have to face. According to where the short circuits occurred, voltage sags can be divided into two categories, interior voltage sag and exterior voltage sag. Exterior voltage sag caused by short circuit taking place in distribution network,...
Recently, Dynamic Voltage Restorer (DVR) has become a popular power electronic device as a protection for sensitive loads from voltage sag. Voltage sag widely known as one of the major problem in power quality, it is defined as a short reduction of voltage from the nominal. DVR is a custom power device for voltage sag mitigation which works when the fault occurs in power distribution system. In this...
The problem of voltage sags and Swells and its severe impact on sensitive loads is well known. To solve this problem, custom power devices are used. One of those devices is the Dynamic Voltage Restorer (DVR), which is one of the most efficient and effective modern custom power devices used in power distribution networks. This paper described DVR principles and voltage correction methods for balanced...
With the development of information and automation techniques, dynamic voltage problems are once again in the spotlight. Dynamic voltage restorer (DVR) is a modern and important custom power device used for mitigating voltage sags in power distribution systems. The operating principles, structures, and control strategies of DVR are surveyed and compared in the paper after investigating a large amount...
In recent years, power system has employed many applications of power electronics technologies for power quality improvement. Unified Power Quality Conditioner (UPQC), which consists of double converters connected by a DC capacitor with each other, has great potential because of its high controllability. Various attractive applications for power quality improvement are considered but the active power...
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