Method and system for identifying transient instability of power system based on trajectory characteristics

A power system, transient instability technology, applied in electrical components, circuit devices, AC network circuits, etc., to achieve good predictability

Active Publication Date: 2020-09-11
CHINA ELECTRIC POWER RES INST
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Problems solved by technology

This type of criterion can predictably judge the transient stability of the power system, but the phase trajectory is difficult to intuitively reflect the transient stability trend of the system

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  • Method and system for identifying transient instability of power system based on trajectory characteristics
  • Method and system for identifying transient instability of power system based on trajectory characteristics
  • Method and system for identifying transient instability of power system based on trajectory characteristics

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[0047]Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0048] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overl...

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Abstract

The invention discloses a method and a system for identifying transient instability of a power system based on trajectory characteristics, and belongs to the technical field of transient stability analysis of the power system. The method comprises the following steps: acquiring real-time operating parameters of a target power system synchronously measured by a wide area measurement system WAMS, and performing digital filtering processing on the synchronously measured real-time operating parameters; enabling the target power system to be equivalent to a single-machine infinite bus system SMIB through stability-preserving transformation, and determining an extended phase trajectory of the target power system according to the equivalent real-time operation parameters of the SMIB; obtaining anintercept value of an extended phase trajectory tangent line on an angular acceleration axis, and extracting a transient stability feature of the target power system; and according to the transient stability criterion of the extended phase trajectory, in combination with transient stability features extracted in real time, it is determined whether the target power system is in transient instability or not. According to the method, the transient stability condition of the system can be correctly identified, the predictability is good, and the time margin is provided for the implementation of stability control measures.

Description

technical field [0001] The present invention relates to the technical field of power system transient stability analysis, and more specifically, relates to a method and system for identifying power system transient instability based on trajectory characteristics. Background technique [0002] Most of the large-scale power outages in the world are caused by the transient instability of the power system. The fast and reliable transient stability analysis method is an important part of the online safety analysis of the power system. With the continuous expansion of the scale of the AC-DC hybrid power grid and the continuous increase in the proportion of intermittent new energy sources, the operating characteristics of the power grid have undergone significant changes, and the operation mode of the power grid has become more complex and changeable. The traditional "offline decision, online matching" transient stability judgment method can no longer meet the needs of modern power...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/10H02J2203/20Y02E60/00
Inventor 马世英朱存浩郑超
Owner CHINA ELECTRIC POWER RES INST
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