Mechanism analysis of power load using difference equation approach

Difference equation based on load model is generally adopted in power system. However, the parameters of the model are often attained by identification method, which leads to the absence of mechanism. In this paper, the authors analytically derive the parameters of difference equation based load model incorporating the induction motor load and static load. Based on the analytical parameters, mechanism of difference equation based load model is analyzed and discussed. Through the simulation and analysis, the paper makes a comparison about the accuracy and relation of model parameters, and the results show that the analytical derivation mechanism model not only has a certain mechanism, but also has good adaptability. In particular, the relation of model parameters make a theoretical support for the reasonability of parameters, and support the verification for the parameters.