Static characteristic of load effects on voltage stability of electric system

Load of electric system is an important factor that affects voltage stability of electric system. We firstly establish V-I characteristic mathematical model of electric system´s power source side in this paper, and we discuss deep that characteristic of node load effects on voltage stability by analyzing V-I characteristic of electric system´s power source side and load side. In view of multinomial model of load, we put forward a kind of new method of determining voltage stability in this paper. This method is not only simple, but also practical, and it may apply to determining speedily degree of voltage stability on line. In the end, experiments test and verify correctness of this method.