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Rapid construction method of thermally stabilized safety domain based on injection power space of key node

A key node, power injection technology, applied in the direction of single-network parallel feeding arrangement, AC network circuit, electrical components, etc., can solve the problems of heavy calculation burden, large numerical simulation calculation, long time consumption, etc., to improve real-time monitoring , Overcome the effect of long calculation time and strong practical value

Active Publication Date: 2018-09-04
CHINA SOUTHERN POWER GRID COMPANY +1
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Problems solved by technology

Although this method can describe the boundary of the security domain and has high accuracy, it requires a large number of numerical simulation calculations, which brings a heavy calculation burden and takes a long time, so it can only be used offline and online.

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  • Rapid construction method of thermally stabilized safety domain based on injection power space of key node
  • Rapid construction method of thermally stabilized safety domain based on injection power space of key node
  • Rapid construction method of thermally stabilized safety domain based on injection power space of key node

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Embodiment Construction

[0028] The present invention proposes a method for quickly constructing a thermally stable security domain based on key node injection power space, and its design idea is to define a dimensionality-reduced thermal stability security domain based on key node injection power space, expressed as follows

[0029]

[0030] In the above formula, n A is the dimension of key node injection space, m is the total number of security domain boundary hyperplanes, α k-i is the hyperplane coefficient of the i-th key node at the boundary of the k-th security domain, P i is the injected power of the i-th key node, c k Indicates the influence coefficient of other non-critical nodes on the kth security domain equation.

[0031] Based on the above definitions, the specific steps of the method are as follows:

[0032] Step 1. Set state variables:

[0033] Select lines and other equipment in the actual power grid that have thermal stability problems such as active power flow exceeding the li...

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Abstract

The invention discloses a rapid construction method of a thermally stabilized safety domain based on an injection power space of a key node. The method comprises that a state variable is set; a control variable is determined; and the thermally stabilized safety domain is constructed. A concept of key node is provided, the thermally stabilized safety domain defined in the injection power space is changed into a simplified safety domain described by a key node space by dimension reduction; and on the basis of a hyperplane characteristic of a boundary of the safety domain, a rapid calculation method of the safety domain coefficient is provided according to a trend constraint boundary equation of a line. Thus, the construction method of the thermally stabilized safety domain can be used to overcome disadvantages that a traditional simulated fitting method includes long calculation time and is not suitable for online application, and the method has better online real-time monitoring, defense and control effects in a large power system. The method can be used to obtain safety margin information and real-time control measures of the system in a present operation point, operation and scheduling of the power grid is guided, and the practical value is high.

Description

technical field [0001] The invention relates to a rapid construction method of a thermally stable security domain, in particular to a rapid construction method of a thermally stable security domain based on key node injection power space. Background technique [0002] In recent years, blackout accidents caused by the destruction of security and stability in large electric power systems have occurred continuously, indicating that the electric power system urgently needs powerful means to realize its online real-time security monitoring, defense and control. For a long time, the analysis methods for the safety and stability of power systems have generally been based on specified scenarios or operating modes under one or several fault modes, and conclusions about whether the system is safe or unsafe, stable or unstable are drawn from simulation calculations . This type of method is called the point-by-point method, and although it still plays an important role in power system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/48H02J3/01
CPCH02J3/00H02J3/01H02J3/48H02J2203/20Y02E40/40
Inventor 曾沅张风彬秦超苏寅生刘春晓李鹏张骞李斌
Owner CHINA SOUTHERN POWER GRID COMPANY
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