Study on extension method based on the load model basic vector

Load characteristics have important effects on dynamic performance of power system. The failure to represent loads in sufficient detail may produce results that miss significant phenomena. The existing load model was inadequate to simulate real process of power system, therefore development and use of more accurate dynamic load models is highly desirable. To get load model for different physical loads in different places in large-scale power grid, measurement devices must be set to record the load dynamic characteristic. This has no problem in theory, but actually, with the power grid bigger and bigger, it´s unacceptable in project to mount so many devices, for the cost on manpower, material resource and money. At present load model which used in Chinese power system simulation is rough, for example, load model in north-east grid is 50% static ZIP which is composed by constant impedance, constant power and constant current load, and 50% induction motor which represents the dynamic characteristic of load, load model in north China grid is 40% constant impedance load and 60% constant power load.