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A Probabilistic Evaluation Method for Urban Transmission Network Security Considering Elasticity Margin

A technology for power grid security and transmission network, applied in data processing applications, instruments, calculations, etc., can solve problems such as inaccurate calculation of transmission network safety margins

Active Publication Date: 2022-07-08
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 transmission network considering the elastic margin, and to solve the problem of inaccurate calculation of the safety margin of the transmission network

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  • A Probabilistic Evaluation Method for Urban Transmission Network Security Considering Elasticity Margin
  • A Probabilistic Evaluation Method for Urban Transmission Network Security Considering Elasticity Margin
  • A Probabilistic Evaluation Method for Urban Transmission Network Security Considering Elasticity Margin

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Embodiment Construction

[0080] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

[0081] like figure 1 As shown in the figure, a probabilistic assessment method for the safety of urban transmission network considering elasticity 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 estimated points of 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 Each evaluation sample in calculates the evaluation index value of the safety margin of the power grid and its corresponding weight coefficient;

[0085...

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Abstract

The invention relates to a method for evaluating the safety probability of an urban power transmission network considering an elastic margin. In the present invention, the wind farm output power probability model and the comprehensive load power demand probability model are used to describe the change of the node injected power of the transmission network; the three-point estimation method is used to select evaluation samples to form a sample evaluation matrix, which reduces the amount of evaluation calculation; the node injection power The change causes the power flow of each branch to shift to different degrees, and the branch that is sensitive to the power fluctuation of some nodes will have a large power flow shift. RSSD can reflect the sensitivity of the transmission network security to the change of node power; the sample evaluation matrix Each sample in the sample corresponds to the determined node injection power. The high-voltage distribution network is reconfigured to perform load transfer and change the operation mode to generate an elastic margin for the transmission network. A feasible topology state of the high-voltage distribution network is selected as the operation mode. Each evaluation sample has a maximum safety margin.

Description

technical field [0001] The invention relates to the field of urban power grid security assessment, in particular to an urban power transmission grid security probability assessment method 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 imbalance of load time and space distribution more severe. The high-voltage distribution network (110kV), as a transitional grid between the urban transmission network (220kV) and the medium-voltage distribution network (10kV and below), is a 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 standby 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 transmission, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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