A Simplified WECC Composited Load Model for Ambient Signals-Based Identification

With the development of electrical technology, the load in the electric power system has changed a lot, especially in the dynamic load. As a result, the load shows brand new dynamic characteristics which means that the traditional load model is incapable of the Simulation and calculation of the electric power system. In this paper, a simplified composited load model-based ambient signal identification is proposed. Firstly, in order to carry out the convex optimization of the load parameters, a quasi-convexity load model is introduced. Then, the power characteristics of several kinds of dynamic load such as electronic load, single phase motor, static load, and so on, under ambient signal is discussed, after which the load is divided into two parts--equivalent static load and motor load. Afterwards, the time-varying load makes it necessary to model the load under large disturbance. The composite load model will be more suitable for the study of the dynamic load.