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Chain overload protection control method

A control method and chain overload technology, which can be applied to AC networks with the same frequency from different sources, etc., can solve problems such as the inability to effectively eliminate the overload of multiple branches, and achieve the enhancement of overload elimination capability, reduction of calculation amount, and acceleration of overload elimination. effect of speed

Inactive Publication Date: 2019-02-15
YUNNAN POWER GRID +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-chain overload control method that eliminates overload by using the optimal control node pair obtained by each round of adjustment to solve the problem that the prior art cannot effectively eliminate the overload of multiple branches in the section

Method used

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Embodiment 1

[0093] see figure 1 , an anti-chain overload control method, followed by the following steps:

[0094] Step 1. Taking the IEEE39 node system as the object, obtain the operation information of each branch from the current power flow state, and determine the key branch set K composed of the overloaded branch set L and the overloaded branch set M. Among them, the system includes 4 Generalized power flow transfer areas, namely D1, D2, D3 and D4, the specific division is as follows figure 2 As shown, let the adjustment margin of each control node be 10% of the output limit. When the branch pair (5-8,6-7) is disconnected, the branch 2-1 exceeds the limit of 388.83MW, the overload rate is 1.648, and the heavy load The load ratios of branches 1-39 and 5-4 are 0.885 and 0.890 respectively, and the specific power flow information is shown in Table 1:

[0095] Table 1 Power flow information of key branch set K

[0096]

[0097] Step 2. Calculate the pairing sensitivity of each con...

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Abstract

The invention relates to a chain overload protection control method. The method comprises the steps of firstly, determining a key branch set according to operation information of each branch; then, calculating a pairing sensitivity of each control node in a generalized tidal current transfer region where an overload branch is located on the overload branch, and screening out effective control nodepairs to be added to a set omega; then, calculating an improved comprehensive sensitivity of each effective control node pair in the set omega, and selecting the control node pair with a maximum comprehensive sensitivity value as an optimal control unit in the cycle; then, calculating an adjustment amount deltaPij of the control node pairs; performing deloading control according to deltaPij, refreshing a branch tidal current by use of a sensitivity relation and correcting a node output, and simultaneously judging whether an overload phenomenon is eliminated or not. With the design, not only can the calculated amount of emergency control be greatly reduced, but also the overload elimination capability is enhanced and the overload elimination speed is accelerated.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to an anti-chain overload control method. Background technique [0002] The rapid development of the electric power industry has provided a strong guarantee for social progress, productivity development and national security, but its own safe operation problems have also emerged day by day. Large-scale interconnection of power grids has become the general trend, and the dynamic behavior of the system has become more and more complex. In large-scale power grids with increasingly complex grid structures, power flow transfer overload has become the main booster for the development of cascading failures, while emergency control is still It is an important means to prevent blackout accidents. [0003] Branch overload emergency control belongs to the category of active safety correction. By taking effective measures to quickly reduce the power flow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 李本瑜游昊石恒初陈剑平方毅杨远航罗吉张鑫任文鹏秦昊蔡明芳
Owner YUNNAN POWER GRID
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