Critical switching of capacitors to prevent voltage collapse

• DOI: 10.1016/j.epsr.2003.12.016
• Publication Date: 2004-02-05T10:34:35Z
• Authors: P.K. Satpathy; D. Das; P.B. Dutta Gupta
• Keywords: Busbar; Cascading failure

Abstract In this paper, critical switching of capacitors is studied for preventing voltage instability in transmission networks. In order to make a realistic analysis of the problem, both static and dynamic approaches are combined. Through static analysis, the steady-state power flow solutions are obtained for the three distinct scenarios, namely; pre-disturbance steady-state, post-disturbance steady-state without any VAR support and post-disturbance steady-state with VAR support. Line outage contingencies supporting the disturbance are simulated and the effect is observed at the most critical busbars for the analysis of voltage instability. A dynamic analysis is conducted involving the post-disturbance dynamic recovery of the aggregated load. Also, a criterion for critical switching of capacitors is proposed and subsequently the critical switching time is investigated to ensure voltage stability in the network. Case studies on IEEE 14-bus test system, IEEE 24-bus reliability test system, IEEE 30-bus test system and IEEE 57-bus test system are presented. The results represent the variation of critical switching time against parameters of aggregate load and system conditions.