Protection method and protection system for sub-synchronous and super-synchronous oscillation in power system

A power system, super-synchronization technology, applied in power network operating system integration, information technology support system, measurement of electrical variables, etc. Guaranteed effect of reliability

Active Publication Date: 2016-04-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering that when subsynchronous and / or supersynchronous oscillations actually occur, the output of related equipment in the grid contains subsynchronous and / or supersynchronous harmonic components to a greater or lesser extent, it is difficult to locate which equipment is active The incentive source of the equipment, which equipment is only passive (passive) participants, so it is difficult to achieve accurate protection, which is easy to cause "overcut" (that is, the removal of passive equipment, causing the accident to expand) or "undercut" (that is, failure to remove sufficient excitation sources so that oscillations cannot be completely suppressed) phenomenon

Method used

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  • Protection method and protection system for sub-synchronous and super-synchronous oscillation in power system
  • Protection method and protection system for sub-synchronous and super-synchronous oscillation in power system
  • Protection method and protection system for sub-synchronous and super-synchronous oscillation in power system

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Embodiment Construction

[0026] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless specifically defined otherwise.

[0028] In the present inventi...

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Abstract

The invention discloses a protection method and a protection system for sub-synchronous and super-synchronous oscillation in a power system. The method comprises the following steps: detecting the voltage and current of sub-synchronous harmonic and / or super-synchronous harmonic of a to-be-detected object; getting the sub-synchronous and / or super-synchronous harmonic complex impedance according to the voltage and current of sub-synchronous harmonic and / or super-synchronous harmonic; judging whether the to-be-detected object is a sub-synchronous excitation source or a super-synchronous excitation source according to the sub-synchronous and / or super-synchronous harmonic complex impedance; and sending an alarm signal or a trip signal if the to-be-detected object is a sub-synchronous excitation source or a super-synchronous excitation source. By using the protection method in the embodiment of the invention, sub-synchronous and / or super-synchronous excitation sources in the power grid can be quickly removed, so as to eliminate the negative impact of sub / super-synchronous oscillation on the power system and better ensure the reliability of the power system.

Description

Technical field [0001] The present invention relates to the technical field of power systems, in particular to a protection method and system for sub-synchronous and super-synchronous oscillations in a power system. Background technique [0002] In recent years, the rapid and continuous development of new energy power generation technologies, such as wind power and photovoltaics, has provided humans with clean and sustainable electrical energy. At the same time, various power electronic equipment or devices, such as static synchronous compensators (STATCOM), and flexible DC transmission Inverters have also been widely used. However, in a specific control mode or operation mode, once these new power equipment are connected to the grid to operate, it may cause dangerous subsynchronous and / or supersynchronous oscillations, and then generate corresponding interharmonic components in the grid and its equipment. Endanger the safe and stable operation of the power grid and affect the q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/14G01R27/02
CPCY02B70/3225Y04S20/222H02J3/14G01R27/02
Inventor 谢小荣刘华坤
Owner TSINGHUA UNIV
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