Can DVR be used for voltage sag and swell mitigation?

In this paper, the advantage of including DVR in distribution system for the purpose of voltage sag and swell mitigation is interpreted. The DVR presented here is based on the concept of dqo. The control method is found very efficient for identifying and clearing any power quality disturbance in distribution systems.

What is voltage sag in a power system?

Voltage sag is defined as a decrease (between 10% and 90%) in RMS voltage at the power frequency for the duration of 0.5 cycles to 1 minute. In the network design under consideration, the motor at the 11kV bus bar is not started until the eighth second, which results in a sag in the voltage on the 11kV line.

How does a DVR compensate for a sagged voltage?

In-Phase compensation The DVR compensates only for the voltage magnitude in this particular compensation method, i.e. the compensated voltage has an equivalent phase as that of sagged voltage and it only compensates for the voltage magnitude. So this method minimizes the voltage injected by the DVR.

Does a DVR compensate SAG and swell?

(b)Voltage injected by DVR as a response to Swell In this paper, the modelling and simulation of a DVR for 3Φ 415V, 50 Hz distribution system with Sinusoidal PWM based controller has been developed by using Matlab/Simulink. The simulation results show that the DVR compensates the sag and swell and provides excellent voltage regulation.

What is pre sag compensation?

Pre-sag compensation Non linear loads need both magnitude as well as phase angle compensation. In pre-sag compensation technique, DVR provides the difference between pre-sag and sag voltage therefore restoring the voltage magnitude as well as the phase angle to that of the pre-sag value. Therefore this method is suited to nonlinear loads.

What causes voltage sag?

Faults on electric power system like short circuit owing to insulation breakdown at heavy load conditions will cause voltage sag. The voltage sag will be defined as decrease in rms value of voltage below the nominal voltage starting from 0.1 to 0.9 pu which lasts for a cycle to 1 minute.