Abstract
In power system, load drop can be observed following a severe fault. It is viewed as one of uncertain factors for the computation of control variable on a frequency stabilizing system for islanded system. The accurate estimation based on short-term actual power and voltage measurements of load just after clearing the fault is difficult since it contains a transient response due to load dynamic characteristic. We propose a new estimation method for load drop amount using a nonlinear dynamic load model. The method utilizes useful pieces of analysis information of load dynamic characteristics, which is derived from actual measurement data on a certain measure point, for effective online estimation. We also present numerical test results with real data of fault cases for validation and demonstrate the effectiveness of our method.
