Development of a dynamic ZIP-motor load model from on-line field measurements

• Published in: International journal of electrical power & energy systems 1997-10, Vol.19 (7), p.459-468
• Main Authors: Chiang, Hsiao-Dong, Wang, Jin-Cheng, Huang, Chiang-Tsung, Chen, Yung-Tien, Huang, Chang-Horng
• Format: Article
• Language: English
• Subjects: Applied sciences; dynamic load model; Electrical engineering. Electrical power engineering; Electrical power engineering; Exact sciences and technology; nonlinear parameter estimation; on-line digital measurements; Power networks and lines; stochastic approximation technique; Theory. Simulation
• ISSN: 0142-0615; 1879-3517
• DOI: 10.1016/S0142-0615(97)00016-1

We developed, using on-line field measurements, a dynamic ZIP-motor load model which attempts to capture the dynamic behavior of loads. The dynamic ZIP-motor load model consists of two parts: a static part and a dynamic part, where the static load is represented by a combination of constant impedance, constant current and constant power while the dynamic load is represented by an induction motor model. A procedure for building the model structure of the dyanmic ZIP-motor load model is developed. An effective solution algorithm for estimating the associated model parameters is presented. A notable feature of the algorithm is that the model parameters are estimated based upon pseudo-gradient information instead of exact gradient calculation. The proposed algorithm is easy to implement and can be used to identify nonlinearities associated with ZIP-motor models, such as models accounting for magnetizing and leakage reactances. The results developed in this paper are tested and evaluated using real field measurements from a real power system. It is shown numerically in the case study that the developed dynamic load model can accurately capture the dynamic behaviors of loads.