A Comprehensive Study Approach for Evaluation of Resonance and Ferro-Resonance in HV Substations A Case Study: Khuzestan Regional Electric Company

Abstract

Resonance and ferroresonance in power systems are categorized as two destructive phenomena especially in HV networks which their occurrence are being initiated in consequence of a power system event. Hence, the study of resonance and ferroresonance requires an exhaustive evaluation of possible network events in different network configurations. In each event, the analysis of network voltages is conducted based on identified allowable limits by IEEE 519 standard as evaluation critera. In this paper, a novel comprehensive study approach is used for resonance and ferroresonance phenomena study in a real power system (KzREC). The utilized approach comprises different steps including substation equipment modeling, EMT simulation of the probable switching events, evaluation of correspondence results, and finally detecting the probable ferroresonance occurrence. Furthermore, voltage and current limits are implemented to define impedance criteria for performing resonance evaluation of network buses. In this paper, the detailed evaluation results of a 230 kV substation (Andimeshk) are presented as an example substation. By performing the proposed evaluations, the probable condition which may lead to resonance and ferroresonance occurrence are identified. The results are highly valuable for network operators in the prevention of unintended overvoltages occurrencesubstation.