Method and system for realizing stabilized monitoring of static voltage in electric power system

Abstract

The invention relates to a method and a system for realizing stabilized monitoring of a static voltage in an electric power system. The method comprises the steps of: constructing power flow equations corresponding to a power flow method, and solving an initial transition running state of the system according to the power flow equations; detecting whether the solved initial transition running state meets a preset switching condition, if yes, constructing expanded power flow equations corresponding to a continuous power flow method based on the current running state of the system, and solving a system stable transition running state of the system according to the expanded power flow equations; and generating a system P-V curve according to the solved initial transition running state and stable transition running state, and further obtaining a stable power limit value of the static voltage and voltage critical value information when the load of the electric power system changes. According to the invention, the generation speed of the P-V curve us increased, the generation precision of the P-V curve is ensured, and the stable power limit value of the static voltage and the voltage critical value information when the load of the electric power system changes are obtained rapidly and accurately.

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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