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Abstract

he modern power system is an integrated complex dynamic system. Due to its scale and complexity, the power system operation and control heavily rely on numerical simulations based on power system models which includes load models. It has been observed that using different load models in the power system simulation may produce quite different, and even contradictory simulation results. Although the importance of load modeling on system dynamics has been well known, load modeling is still a very challenging problem. Thus, there remains a strong necessity for the development of an accurate dynamic load model for power system dynamic analysis because an inaccurate load model may mislead system operators and planners to make incorrect decisions. A Load Model Parameter Derivation (LMPD) program developed by EPRI has been used to investigate the measurement based approach of modeling loads. This paper presents the study results of deriving the load parameters by using measured data of the events from Taiwan Power system. Thirteen disturbance events from over 500 events in the Taiwan power system have been selected, and then the load model parameters are derived via the measurement data of those events. In this paper, the LMPD method is first introduced. Then the procedures of data processing and event selection are briefly discussed. Study results, which provide the static and dynamic parameters of load at each substation, and observations are presented and analyzed. The final part is conclusions.

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