PSO Based Optimal Location and Sizing of SVC for Novel Multiobjective Voltage Stability Analysis during N – 2 Line Contingency

Abstract

In this paper voltage stability is analysed based not only on the voltage deviations from the nominal values but also on the number of limit violating buses and severity of voltage limit violations. The expression of the actual state of the system as a numerical index like severity, aids the system operator in taking better security related decisions at control centres both during a period of contingency and also at a highly stressed operating condition. In contrary to conventional N – 1 contingency analysis, Northern Electric Reliability Council (NERC) recommends N – 2 line contingency analysis. The decision of the system operator to overcome the present contingency state of the system must blend harmoniously with the stability of the system. Hence the work presents a novel N – 2 contingency analysis based on the continuous severity function of the system. The study is performed on 4005 possible combinations of N – 2 contingency states for the practical Indian Utility 62 bus system. Static VAr Compensator is used to improve voltage profile during line contingencies. A multi- objective optimization with the objective of minimizing the voltage deviation and also the number of limit violating bus with optimal location and optimal sizing of SVC is achieved by Particle Swarm Optimization algorithm.

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Archives of Electrical Engineering

“…The early work of most authors on the performance assessment of weak buses in a power grid is centered on traditional power flow methods. Methods like continuation power flow, modal analysis, sensitivity analysis, use of voltage stability indices, and P-V and Q-V curves to mention a few, have generally been used to find a critical node in a power system [6][7][8][9][10]. Even though, these methods give valuable insight, however, the approaches are not without shortcomings, as they did not take into consideration, the interconnection that exists among the elements (loads and generators) and the influence of power network topology [11][12][13][14].…”

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