Main Article Content
Abstract
Voltage sag disturbances are the most frequently occurring Power Quality problems in the distribution system. This paper explains simulation of a dynamic voltage restorer as a voltage sag and swell mitigation device in electrical power distribution networks. A Dynamic Voltage Restorer is proposed to handle deep voltage sags, swells and outages on a low voltage single phase residential distribution system. The dynamic voltage restorer with its excellent dynamic capabilities, when installed between the supply and a critical load can compensate for voltage sags/swells, restoring line voltage to its nominal value within a few milliseconds and hence avoiding any power disruption to the sensitive load. Otherwise, it will operate as an Uninterruptable Power Supply across the sensitive load when disturbance occurs on the supply voltage. It is also designed to reduce the usage of utility power. A series injection transformer is connected in series with the sensitive loads which restoring voltage sag and swell to a nominal voltage by protecting the sensitive load from damage.