Load Models for Flat-Panel TVs

Abstract

A realistic representation of power system loads has proven to be essential for ensuring reliable and economic operation of a power system. Although the exact load model is nearly impossible to obtain, it is still possible to find a suitable load representation that can improve the accuracy of steady-state and dynamic simulations. Load model development has been a continuous effort among industry since the 1980s. However, with the ever increasing development of technology, electric appliances and equipment behavior have changed. In particular, home electronics, such as televisions, are a good example of these changes not only for their cutting edge technology but also for their penetration into the system. Electronic loads tend to behave mostly near constant power with respect to voltage and frequency variations, which may have significant impact on the system stability. Devoting efforts to include the load models of new appliances become a critical issue in the field of computer simulation. This paper devotes its efforts to develop ZIP load models for liquid-crystal-display and light-emitting-diode televisions to be added into the family of the load models to improve the accuracy of system simulation. A computer simulation of a power system illustrates the impact of load models on the stability of the power systems.