Voltage curve developing of 220kV power plant based on the optimal voltage difference method

Based on the optimal allocation of reactive power load between a 220kV power plant and power systems to minimize the active power loss, this paper shows some key factors affecting the optimal reactive power of power plant. An evaluation index is proposed to reflect the relationship between the voltage magnitude of power plant and the reactive power flow of the system, i.e., the voltage difference between the high-voltage bus of power plant and the hinge bus. Then, by controlling the value of variables that affect the voltage difference, the paper adopts an optimal mathematical model to obtain the optimal voltage difference under different operation modes of power grids. After differently and uniformly dealing with the optimal voltage difference, the daily voltage control curve of power plant is optimally developed with rounding the predictive voltage curve of the hinge bus. The effectiveness of the method is verified by example results.