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Online voltage stability early warning method and system based on Thevenin equivalence

A Thevenin equivalent and voltage stability technology, applied in the field of power systems, can solve problems such as application scale, speed and reliability that are difficult to adapt to online real-time evaluation of voltage stability, inconsistency with component models and parameters, inaccuracy, etc., to achieve beneficial The effect of the rapid assessment

Active Publication Date: 2019-12-13
CHINA ELECTRIC POWER RES INST +2
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  • Claims
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Problems solved by technology

[0005] At present, the numerical algorithms used for the simulation of static voltage stability and dynamic voltage stability of power systems are relatively mature, and the reason why the simulation results do not match the real system is mainly due to the inaccuracy of the component models and parameters in the...

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  • Online voltage stability early warning method and system based on Thevenin equivalence
  • Online voltage stability early warning method and system based on Thevenin equivalence
  • Online voltage stability early warning method and system based on Thevenin equivalence

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Embodiment Construction

[0051] 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 provided with the same reference numerals.

[0052]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 idealize...

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Abstract

The invention discloses an online voltage stability early warning method based on Thevenin equivalence, including: S1, establishing a Thevenin equivalent system S2 between each unit generator on an online voltage system side and a target node voltage; S2, according to the Thevenin equivalent system in the S1, calculating the sensitivity of the electromotive force of each unit generator on the online voltage system side in the S1 to the target node voltage; S3, calculating an online node voltage stability margin value based on the sensitivity in the S2; and S4, setting a threshold value, comparing the stability margin value in the S3 with the threshold value, obtaining an online voltage stability result based on a comparison result, and giving an early warning for a circuit network where the online voltage is located according to the result.

Description

[0001] technology field [0002] The invention belongs to the technical field of power systems, and in particular relates to a method and a system for early warning of online voltage stability based on Thevenin equivalents. Background technique [0003] With the unpredictable growth of electricity load and the increasing complexity of power system operation, the operation of power system may approach the limit state at any time, and the risk of voltage instability will gradually increase. Multiple voltage instability accidents at home and abroad have caused huge economic losses and social impacts, and the voltage stability problem has attracted extensive attention of power system researchers. At the same time, in terms of power grid industrial calculation and operation, with the emergence of extreme maintenance methods in recent years, the problem of voltage stability has become one of the main threats to the safe operation of the power grid. Research is one of the core issue...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 付红军熊浩清代飞唐晓骏申旭辉陈上吉金一丁熊化化白梁军罗红梅鲁华永王兴国冯旸谢岩霍启迪李晓珺吉平李媛媛李立新陈萌
Owner CHINA ELECTRIC POWER RES INST
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