Improvement in Voltage Recovery Delay Phenomenon Caused by Air Conditioners Specific Performance

Fault Induced Delayed Voltage Recovery (FIDVR) can cause a threat to the power system voltage stability. Due to the increasing penetration of Air Conditioning (A/C) loads in the power system and the specific behavior of these types of loads, the speed of voltage recovery is significantly reduced when a short circuit fault occurs in the power system. In this paper, a number of common A/Cs installed in the tropical region of southern Iran are investigated and their developed models are compared against the results of the related experimental modeling in other references. Subsequently, a comprehensive model is developed to simulate the behavior of A/C loads in a power system. To determine the power system vulnerabilities to voltage recovery, a screening method is proposed. Additionally, to increase the speed of voltage recovery, the “Impedance Deviation based Load Shedding” method is proposed. Using this method, the most effective buses in the improvement of delayed voltage recovery, are found and subsequently, the amount and priority of the load elimination needed to reduce the effects of FIDVR are determined. The results of simulations on the IEEE 39-bus test system, verifies the high performance of the load models employed and also the load shedding method used to address the FIDVR phenomenon.