A novel method for the analysis of the impact of the high-power motor starting on grid

The starting current in high-power motor is very high, which will cause the voltage drop during start. Especially, with the smaller capacity of the source, the voltage drop in the grid is even more. In this paper, a new method for the simulation of the voltage drop in grid, caused by motor starting, is presented. Depending on the different start-up methods, the method determines the equivalent circuit of the motor at start up time. With the use of the transient simulation and the full consideration of the transient regulation of the grid, this method has solved the limitations of the traditional simulation, and is more accurate. Then, the proposed method will be applied to the high-power motor in one steel plant. Comparison between the simulation and the measured curves has confirmed that the results of simulation are accurate and reasonable. The proposed method could be extensively used to the analysis of the voltage drop in grid caused by the motor starting in the future, for the choice of the reasonable start-up method.