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Net rack optimization method for multi-direct-current centralized fed receiving end power grid

A technology for optimizing the power grid and grid at the receiving end. It is applied in the field of power systems and can solve the problems of large computing workload and achieving ideal results.

Active Publication Date: 2013-08-21
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the above-mentioned problems in planning the power grid, most of them rely on the experience of planners, put forward multiple possible solutions, and carry out a large number of simulation calculations and comparative analysis. The calculation workload is heavy and the ideal effect may not be achieved.

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  • Net rack optimization method for multi-direct-current centralized fed receiving end power grid
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  • Net rack optimization method for multi-direct-current centralized fed receiving end power grid

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Embodiment

[0161] In the embodiment of the present invention, the planning map of Shanghai's 500 kV and above power grid in 2015 is as follows Figure 5 shown in Figure 5 The planned power grid in Shanghai in 2015 is the analysis object. Considering a 5% margin, for a circuit breaker with a maximum breaking current of 50kA, set the upper limit of the short-circuit current control to 47.50kA; for a circuit breaker with a maximum breaking current of 63kA, set the upper limit of the short-circuit current control to 59.85kA. Set the impedance range of the current-limiting reactor to 0~10Ω; the minimum value of the multi-infeed short-circuit ratio is 2.5; the cost coefficient of breaking the line is k as =60,k bs =0, the cost coefficient of installing a current-limiting reactor is k as =625,k bs =25.

[0162] According to the plan, by 2015, Shanghai Power Grid will have 4 DC drop points in Fengjing, Nanqiao, Huaxin, and Fengxian, forming a typical multi-infeed DC receiving end system. ...

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Abstract

The invention relates to the field of the electric system technology, in particular to a net rack optimization method for a multi-direct-current centralized fed receiving end power grid. According to the method, the network voltage supporting capacity of the receiving end power grid, the short-circuit current control effect of the receiving end power grid and the short-circuit current control measure cost of the receiving end power grid are all considered. The method includes the steps of taking the maximum multi-direct-current feeding comprehensive short-circuit ratio, the maximum short-circuit capacity comprehensive margin and the minimum total cost of investment of current limiting measures as three objective functions, building a multi-objective optimized mathematical model which includes the three objective functions and power grid constraint conditions, and utilizing an NSGA-II multi-objective genetic algorithm to carry out the multi-objective optimization method. A result provided through the method is a line unlocking or series reactor added combining scheme, and the power grid can have strong voltage supporting capacity and system stability on the basis of controlling of a short-circuit current through moderate cost. The method has strong adaptability to an existing receiving end power grid optimization scheme.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a receiving-end power grid network frame optimization method for multi-direct current centralized feed-in. Background technique [0002] It is a typical feature of the future receiving-end power grid that multiple DCs are simultaneously fed into the same receiving area. For example, the Yangtze River Delta, Pearl River Delta and other regions will have multiple DC feeds at the same time in the future, and some of them will be UHV DC. Relevant theoretical and actual simulation calculations have found that the biggest risk faced by multiple DC feed-in receiving end grids is the problem of voltage stability. Once the scale of DC feed-in is too large and concentrated, the risk of DC chain reaction after AC faults is relatively high, and may even lead to the collapse of the entire network. Therefore, for the multi-DC feed-in receiving end grid in the future, reasonable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/06
Inventor 周勤勇杨冬
Owner STATE GRID CORP OF CHINA
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