Method and system for realizing static voltage stability monitoring in power system

Abstract

The invention relates to a method and system for realizing static voltage stability monitoring in a power system. The method includes: constructing a power flow equation corresponding to the direct power flow method, and solving the initial transitional operation state of the system according to the power flow equation; detecting the solved initial transitional operation state to judge whether the preset switching condition is met, and if so, constructing a continuous The extended power flow equation corresponding to the power flow method, according to the extended power flow equation, solves the stable transitional operating state of the system; generates the system P-V curve according to the solved initial transitional operating state and stable transitional operating state, and then obtains the static voltage stability when the power system load changes Power limit value and voltage threshold value information. The invention not only increases the speed of P-V curve generation, but also ensures the accuracy of P-V curve generation, and can quickly and accurately obtain the power limit value and voltage critical value information of static voltage stability when the power system load changes.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and system for realizing static voltage stability monitoring in power systems. Background technique [0002] In the power system, static voltage stability analysis is an important part of power system safety and stability analysis, and power flow calculation is usually used to realize the analysis of static voltage stability, for example, through power flow calculation of each transitional operating state of the power system, and then the system voltage V The relationship curve with active power P (that is, the P-V curve), in order to analyze the power limit value and voltage critical value information of static voltage stability when the power system load changes. [0003] Power flow calculation is a basic electrical calculation for studying the steady-state operation of power systems. The results of power flow calculations are the basis for power system stability...

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Problems solved by technology

However, when the continuous power flow method is used, the selection of the step size is closely related to the system conditions, and it often requires repeated predictions to obtain an appropriate step size; since the power flow calculation of each transitional operating state needs to be predicted (otherwise the convergence is difficult to guarantee ), so the calculation of the same number of transitional operating states is much larger than that of the direct power flow method, resulting in a long time-consuming and slow speed for obtaining a complete P-V curve, and the static voltage stability analysis cannot be realized in time

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