Newton-Raphson Method Based Power Flow Analysis and Dynamic Security Assessment

Abstract

China will accelerate the construction of a new power system under the goal of "carbon neutrality and emission peak". With the change of energy structure and system characteristics, the uncertainty on both the supply and demand sides of the power system has increased significantly, and the problem of small disturbance stability has gradually emerged. In this paper, by performing power flow calculation for the power system, the nodes requiring voltage regulation and the lines with the highest active power losses are identified, and adjustment measures are provided according to their location. In that way, the terminal voltage of each power-using device can be maintained within the specified fluctuation range, reducing the active power losses in the network while satisfying customer demand, which lowers the cost of electrical energy and reduces the waste of energy resources. This paper first introduces the basic mathematical model of the power system and the principle of the Newton-Raphson method for solving power flow. Then simulates the IEEE standard node system and proposes grid operation optimization recommendations such as adjusting the output of generating units or reactive power compensation in conjunction with the simulation results of the calculation example. It enables efficient and targeted measures to be taken to improve system safety and economy in real-time monitoring of power systems, ensuring safe and economic operation.