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A Two Bus Equivalent Method for Determination of Steady State Voltage Stability Limit of a Power System

By B. Venkata Ramana and K. V. S. R. MurthyP. Upendra Kumar, V. Raja Kumar/international, Journal Of, B. Venkata Ramana and K. V. S. R. Murthy


The problem of voltage instability is gaining more and more importance because of the unusual growth of power systems and insufficient or inefficient reactive power management. The voltage stability problem of a power system is associated with a rapid voltage drop due to heavy system load. Voltage reduction has a cumulative effect unless ample reactive power sources are available to regulate the voltage and maintain the reactive power balance. In this paper, simple and direct method of determining the steady state voltage stability limit of a power system at a particular load bus is implemented. The maximum permissible loading of a particular load bus is determined through a simplified Two-Bus equivalent model, called “Thevenin's Equivalent” of the original system. This method uses the base-case system information to find special Two-Bus equivalents of the system for analyzing the voltage stability problem. The effectiveness of this method is tested on a simple Two-Bus system and on the IEEE 14 Bus and IEEE 30 Bus systems and the results are compared with Newton- Raphson method. System performance is analyzed with and without a Static Var Compensator (SVC). The effects of load power factor and SVC rating on voltage stability limit are also studied. This method is very simple and does not require repetitive load flow simulation

Topics: Index Terms-Voltage Stability, Y-bus, Newton-Raphson Load Flow, Thevenin‟s Equivalent circuit, Q-V curves, Static Var Compensator (SVC
Year: 2014
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