Method and system for load modeling

PURPOSE: A load modeling method and a system are provided to utilize data obtained through an EMS(energy management system) and use a Kalman filter, thereby estimating a parameter of a ZIP model without complex calculation. CONSTITUTION: A data collection unit collects power data and voltage data. A parameter estimation unit(6000) applies the power data and the voltage data to a Kalman filter and estimates a load model parameter. The parameter estimation unit includes a determinative vector calculation unit(6100) calculating a determinative vector composed of values for voltage; an effective power vector calculation unit(6200) finding the collected effective power vector; and a Kalman filter application unit(6400) finding a state vector composed of the load model parameter for the effective power vector. [Reference numerals] (6100) Determinative vector calculation unit; (6200) Effective power vector calculation unit; (6300) Data classification unit; (6400) Kalman filter application unit; (6500) ZIP modeling unit