A proposed voltage ride through compensators for improving power system performance

Power quality is one of the most common problems now and in the near future especially after the increas-ing penetration of renewable energy in the power system grid. The abnormal operating conditions (such as heavy load-ing conditions, frequently starting of large induction motors and transmission system faults…) in electric system utility are considered as the main reasons of power quality problems. In this paper, the various main reasons of voltage sag problem are studied. The obtained results of the used simulation program (Electromagnetic Transient Programs ETAP and ATP) show the magnitude and duration of the voltage sag arising from the faults is more severe than that of the other causes, especially in the heavily loaded network. Also, three types of compensators (shunt, series and a combined of shunt and series (Unified Power Flow Controller (UPFC)) are addressed. The obtained results of hundred runs of the simulation program show the performance of the overall system before and after using different types of compensators. The proposed Unified Power Flow Controller (UPFC) gives better performance over the shunt and the series compensators. The most effective buses or lines (best location of compensators) also determined using the proposed system performance indices.

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