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It is well known that adequate dynamic load model is essential for evaluating power system stability. The simulation results using traditional static load models are sometimes misleading especially in short-term synchronous and voltage stability, because those models neglect dynamic behavior of existing loads. Some load models based on physical structure have been studied. One example of them is the composite load model made of parallel constant admittance and induction motor (IM). However there are two difficulties. One is determining various parameters. Another is the measurement of series reactance from observation point to internal load. For representing the behavior of actual load, this paper presents a concept of dynamic load, that is, a variable conductance G behind a constant series reactance X (see Fig. 1). The variable conductance G means the field of energy conversion from electricity to the others. Magnitude of G varies according to the conditions of load and power system. The constant susceptance Bc means the sum of load excitation reactances and compensation capacitors aggregated to the observation point approximately. This paper also presents a method for determining the reactance X by using measured data. Equation (1) shows the relationship of measured variables and model parameters. By assuming an adequate fixed value of Bc, X remains almost constant (about 25% in load MW base), but G takes much higher value instantaneous after fault clearing (see Fig. 2). The tendency is commonly seen in all of 64 measured data in major disturbances, and agrees with the concept.

Dynamic Load Model in Power System Based on Physical Structure and Measured Data