Development of an Algorithm for Generating the Equivalent Power System According to PMU

Abstract

To improve the quality and reliability of the control of electric power modes and to develop a system for monitoring transient processes in the UES of Russia, the technology of synchronized vector measurements is being actively developed and phasor measurement unit (PMU) are being introduced. The promising areas of application of the PMU are: ACS TP of the substation, distributed relay protection systems, emergency and mode automation, combined distributed control systems, protection and automation. The areas noted above include such promising and important tasks as optimization of the modes of the electric power system in terms of voltage and reactive power, adaptive relay protection. The solution to these problems requires a mathematical model of the network. Part of the model must be represented with high accuracy, and the rest of the external network can be represented using an equivalent, which has the same response to the investigated part of the system as a real external network. Using an equivalent allows you to increase the speed of calculations, simplify them and reduce the required computing power. PMU allow the formation of the equivalent of the selected part of the power system with an accuracy sufficient to implement the above tasks online, adapting to the network operating mode.An algorithm for the formation of the equivalent of the power system and the determination of its parameters according to the data of the PMU in the absence of data on the topology and parameters of the equivalent part is developedThe developed algorithm makes it possible to take into account possible interconnections in the external part of the power system, ensures the specified accuracy and high speed in the absence of information about the external power system, for the algorithm to work, it is enough to install the PMU only on the boundary branches, the selected equivalent can be relevant in a number of operating situations.