Özet:

Modern power systems are high-order, multivariable, dynamic systems whose responses to disturbances depend on the different characteristics of a wide array of devices. The studies targets the real time evaluation of operating systems whether at the system planning stage or determination of limits of a planned system or at steady state loading conditions. The complex power systems can reach voltage instability limit at unexpected loading conditions. For this reason, the possibility of voltage collapse event occurrence in operating huge systems can be prevented by momentary evaluation of the combinational events effects in meaning of voltage stability. In this study, series of methods relating to the estimation of equivalence circuit parameter by using local bus parameter are developed. The critical value equalities which provide easiness in evaluation of voltage stability index are obtained from the maximum power phasor diagram. The simulation results indicates that the proposed evaluation approach, is more practical and true in respect to the situation in which the classical load flow algorithm at real time applications is used.

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