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Self-adaptive voltage protection method

A self-adaptive voltage and voltage technology, applied in the field of power system, can solve problems such as poor protection effect, failure, and change of operation mode, so as to avoid relay protection misoperation, extend protection range, and meet protection coordination requirements Effect

Active Publication Date: 2012-07-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0004] In view of the fact that the traditional relay protection mentioned in the above background technology cannot change with the operation mode of the power system, resulting in poor protection effect or insufficient failure, the present invention proposes an adaptive voltage protection method

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Embodiment Construction

[0048] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0049] The technical problem to be solved by the present invention is: without considering the location, quantity and capacity of the distributed power supply access, a new method of self-adaptive voltage protection of the power system is formed by using a limited-area centralized wide-area protection system. Distributed generation for adaptive protection purposes in smart grids.

[0050] The technical solution adopted by the present invention to solve its technical problems: use the limited-area centralized wide-area protection system to store relevant line parameters, obtain voltage and current information in real time, and realize communication between relevant IEDs. On this basis, according to the phase voltage bef...

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Abstract

The invention discloses a self-adaptive voltage protection method in the technical field of electric systems. The method includes: setting up an original system database; constructing a self-adaptive voltage main protection for a distribution network according to the relation between phase current and phase voltage difference before and after failure, and working out a setting value and a measured value of the voltage main protection, wherein when the setting value of the voltage main protection is smaller than the measured value, the main protection does not act, and otherwise, the main protection trips out; and constructing a self-adaptive voltage back-up protection according to the relation between phase current and phase voltage difference before and after failure, and working out a setting value and a measured value of the voltage back-up protection, wherein when the setting value of the voltage back-up protection is smaller than the measured value, the back-up protection does not act, and otherwise, the back-up protection trips out. Real-time adjustment according to variation of operating ways of electric systems and fault types is realized, and accordingly the protection can be operated reliably under the condition of symmetrical faults and asymmetric faults.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to an adaptive voltage protection method. Background technique [0002] The traditional relay protection calculates the fixed value in the maximum operation mode of the power system, and performs offline setting in the way of checking the sensitivity in the minimum operation mode, and the protection setting value is always kept unchanged during operation. However, when the power system is in a non-maximum operating mode, the protection setting is not the best setting value, and the traditional relay protection cannot achieve the best protection effect. When the power system is in the minimum operation mode, traditional relay protection will even fail. In view of this, some experts and scholars have proposed the concept of adaptive protection, that is, the protection that can change the protection performance, characteristics or setting value in real time according...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/20
Inventor 马静王希王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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