Abstract
It is important to include the behavior of load in studies of loss of generation and consequent load shedding and also in studies of long-term dynamics of a power system. This paper describes field test results of load characteristics in power system by using normal operating data. The necessary resolution of data for estimate of load characteristics are investigated and measuring devices are made according to this conclusion. Field test clarified magnitude of fluctuations in system frequency, bus voltage and active and reactive power of load under normal operating condition. Load-frequency and load-voltage characteristics constants are estimated from field test data. Fluctuations of system frequency and voltage behind the equivalent impedance are clarified to be independent to fluctuations of active and reactive power of the major bus load under the state of nominal frequency and voltage. The presuppositions of the proposed method are verified to be sound.
