Urban transmission grid safety probability assessment method considering elasticity margin

A transmission network and margin technology, applied in the direction of instruments, data processing applications, information technology support systems, etc., can solve problems such as inaccurate calculation of transmission network safety margins

Active Publication Date: 2018-11-06
SICHUAN UNIV +1
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for evaluating the safety probability of the urban trans

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  • Urban transmission grid safety probability assessment method considering elasticity margin
  • Urban transmission grid safety probability assessment method considering elasticity margin
  • Urban transmission grid safety probability assessment method considering elasticity margin

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Embodiment Construction

[0080] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0081] Such as figure 1 As shown, a safety probability assessment method of urban transmission network considering elastic margin includes the following steps:

[0082] S1. Initialize the structure, component parameters and node injection power probability model of the power grid and high-voltage distribution network;

[0083] S2. Select the estimation points of the random variables in the node injection power probability model through the principle of the three-point estimation method to form a sample evaluation matrix X r ;

[0084] S3, for the sample matrix X r Calculate the evaluation index value and its corresponding weight coefficient of the power grid safety margin for each evaluation sample in ;

[0085]...

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Abstract

The invention relates to an urban transmission grid safety probability assessment method considering an elasticity margin. In the present invention, a wind power plant output probability model and a comprehensive load power demand probability model are used to describe the change of the injection power of a transmission network node; a three-point estimation method is used to select evaluation samples to form a sample evaluation matrix, which reduces the evaluation calculation amount; the change of the injection power of the node causes the power flow of each branch to shift to different degrees, the branch that is sensitive to the power fluctuation of some nodes has a large power flow offset, the RSSD can reflect the sensitivity of the transmission grid safety to the power change of the node; and each sample in the sample evaluation matrix corresponds to the determined node injection power. The high-voltage distribution network reconfiguration performs the load transfer to change theoperation mode to make the transmission grid generate elastic margin. A feasible topological state of the high-voltage distribution network is selected as the operation mode to enable each evaluationsample to have the greatest safety margin.

Description

technical field [0001] The invention relates to the field of safety evaluation of urban power grids, in particular to a safety probability evaluation method for urban power transmission networks considering elastic margin. Background technique [0002] The gradual increase in the penetration rate of distributed power and electric vehicles in the power grid makes the uneven distribution of load in time and space more severe. The high-voltage distribution network (110kV), as the transitional network between the urban transmission network (220kV) and the medium-voltage distribution network (10kV and below), is the key link to ensure the quality and safety of urban power supply. Its topology is flexible and there are a large number of backup lines , by switching the switch state of the main and backup supply paths, the operation mode can be greatly changed, and the power flow distribution of the transmission network can be dredged. As an important carrier of electric energy, th...

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0635G06Q50/06Y04S50/16
Inventor 吕林杨昕然许立雄刘友波姚一杨
Owner SICHUAN UNIV
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