Real-time on-line identification criterion of electric system node voltage steady state

Abstract

The invention discloses a real-time on-line identification criterion method of an electric system node voltage steady state. After a PMU conducts sampling every time, a voltage stabilization discrimination result is computed in real time, where each discrimination comprises the following steps that 1), data collection and processing are conducted; 2) tracking calculation is conducted on Thevenin equivalent parameters; (3) according to a simple power network obtained through the present Thevenin equivalent parameters, a differential state equation of a node voltage dynamic trajectory is computed and described; (4) a voltage steady state on-line identification criterion of a node to be analyzed is obtained. The real-time on-line identification criterion method of the electric system node voltage steady state achieves voltage steady state on-line identification of the node to be analyzed is obtained by means of PMU measurement data.

Description

technical field [0001] The invention belongs to the field of voltage stability discrimination, and in particular relates to a real-time on-line identification criterion for the stable state of node voltage in a power system. Background technique [0002] The voltage stability problem is a large category of key problems that have a great impact on the stable operation of the power system. However, since the voltage stability problem of the system can only be reflected by the voltage instability of each node in the system, it is difficult to identify the stability state of the node voltage. In order to judge the voltage instability, it is impossible to implement the corresponding voltage stability control strategy at the best control time in advance. Although in recent decades, scholars at home and abroad have paid attention to the research on voltage stability analysis methods and proposed a variety of voltage stability analysis theories and practical methods, due to the com...

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Problems solved by technology

However, since the voltage stability problem of the system can only be reflected by the voltage instability of each node in the system, it is difficult to identify the stability state of the node voltage. In order to judge the voltage instability, it is impossible to implement the corresponding voltage stability control strategy at the best control time in advance

Although in recent decades, scholars at home and abroad have paid attention to the research on voltage stability analysis methods and proposed a variety of voltage stability analysis theories and practical methods, due to the complexity of voltage stability problems, research on voltage stability issues is still developing.

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