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A line breaking method for eliminating the voltage exceeding the upper limit in the Spring Festival mode

A line breaking and upper limit technology, which is applied in the direction of circuit devices, AC network circuits, AC network voltage adjustment, etc., can solve the problems of high charging power of transmission lines and higher voltage upper limit, so as to eliminate the voltage upper limit and avoid load loss , The effect of power grid reliability satisfaction

Active Publication Date: 2018-02-16
STATE GRID HEBEI ELECTRIC POWER CO LTD +3
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method to eliminate the voltage exceeding the upper limit by pulling down the minimum number of lines under the premise of ensuring the reliability of the power grid, so as to eliminate the excessive charging power of the transmission line due to the low load during the Spring Festival. The problem of voltage exceeding the upper limit caused by high voltage

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  • A line breaking method for eliminating the voltage exceeding the upper limit in the Spring Festival mode
  • A line breaking method for eliminating the voltage exceeding the upper limit in the Spring Festival mode
  • A line breaking method for eliminating the voltage exceeding the upper limit in the Spring Festival mode

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Embodiment Construction

[0038] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] Process flow of the present invention such as figure 1 shown.

[0040] S1. First, it is necessary to obtain the topology of the power grid, convert each bus node into a point in the connected graph, and convert each branch into an edge of the connected graph. A connected graph can be expressed as G=(V, E), wherein, V is an endpoint in the graph, and E is an edge connecting the endpoints. Take an 8-node power grid as an example (see figure 2 ), V={V1,V2,V3,V4,V5,V6,V7,V8}, E={[V1,V2],[V1,V3],[V1,V5],[V1,V6],[ V2, V3], [V3, V4], [V4, V5], [V6, V7], [V6, V8], [V7, V8]} form.

[0041] S2. Starting from any node in the connected graph, search for a spanning tree of the network according to the principle of breadth or depth priority, and determine each single-connected branch circuit according to the spanning tree, merge the sin...

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Abstract

The invention provides a circuit engagement and disengagement method for eliminating voltage upper limit surpassing in a Spring Festival mode and relates to a circuit engagement and disengagement method. In the premise of not reducing reliability of a power grid, how to eliminate voltage upper limit surpassing through opening circuits as less as possible becomes a concerned technical problem in power grid modulation. The method includes steps of acquiring power grid rack parameters and tides and generating a connection graph; according to the graph, generating an annular branch circuit sub graph; generating engagement and disengagement simulation analysis on the annular branch circuit sub graph and generating a candidate engagement and disengagement branch circuit set, performing treatment on the candidate engagement and disengagement branch circuit set by using N-1 anticipated faults and generating a valid anticipated fault set; constructing constraints and a target function; solving a minimal engagement and disengagement branch circuit set. According to the technical scheme provided by the invention, in the premise of ensuring the power grid reliability, an aim of eliminating voltage upper limit surpassing through opening circuits of the minimum quantity is achieved, load loss is avoided and power grid reliability is enabled to meet operation requirements.

Description

technical field [0001] The invention relates to a line breaking method, in particular to a line breaking method for eliminating the voltage exceeding the upper limit in the Spring Festival mode. Background technique [0002] The Spring Festival is a special festival in my country. During the festival, due to the low load of the power grid, the charging power flowing into the power grid is large, and the problem of voltage exceeding the upper limit due to excess reactive power is more prominent. [0003] Affected by the year-round operation mode, the adjustment of the transformer tap is subject to many constraints. If the power grid inductive compensation equipment is insufficient, the means of voltage adjustment will rely more on reducing the charging power by pulling down the transmission line, so that the voltage is reduced, and the pulling Stopping the lines will lead to a decline in the reliability and stability of the power grid. On the premise of maintaining the reliab...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCH02J3/14H02J2203/20Y02B70/3225Y04S20/222
Inventor 高泽明曹树江程伦王瑞欣王生彬翟万生曹媛杨兴宇李晓波付俊强张杰
Owner STATE GRID HEBEI ELECTRIC POWER CO LTD
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