Electric power system static safety assessment method based on probabilistic tide

A technology for power system and static safety, which is applied in the field of static safety assessment of power systems based on probabilistic power flow, and can solve the problems that polynomial transformation technology cannot completely retain original random variable statistical information, and Nataf transformation is complicated to calculate.

Active Publication Date: 2014-09-17
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, in the existing methods for dealing with correlations, the traditional Nataf transformation is computationally complex, and the polynomial transformation technology cannot completely retain the statistical information of the original random variables during the transformation process, so it is necessary to further improve the correlation processing method

Method used

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  • Electric power system static safety assessment method based on probabilistic tide
  • Electric power system static safety assessment method based on probabilistic tide
  • Electric power system static safety assessment method based on probabilistic tide

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Embodiment Construction

[0057] The method of the present invention will be specifically described below in conjunction with the accompanying drawings, but the protection method of the present invention should not be limited thereto.

[0058] figure 1 It is the implementation flow chart of static security assessment of power system based on probability flow, as shown in the figure, a method of static security assessment of power system based on probability flow includes the following steps:

[0059] Step 1: Construct the power flow calculation model as shown in the following formula,

[0060]

[0061] In the formula Indicates the net active injection power of the i-th node of the power system; Indicates the net reactive power injected into the i-th node of the power system; V i Indicates the voltage amplitude of the i-th node in the power system; V j Indicates the voltage amplitude of the jth node of the power system; P ij Indicates the line active power flow from node j to node i; θ ij Ind...

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Abstract

The invention discloses an electric power system static safety assessment method based on a probabilistic tide. Statistical information of the random quantity in a system is obtained according to historical data; mutual conversion between a relevant non-normal random variable and an independent normal distribution random variable is achieved by improving Nataf conversion. By means of the electric power system static safety assessment method based on the probabilistic tide, arbitrary probability distribution of many random factors in the electric power system can be coped with, the correlation among the random factors is considered, the processing difficulty of the correlation is reduced, and the electric power system static safety assessment method is suitable for assessing the influence of all kinds of uncertain factors in the electric power system on the static safety of the electric power system.

Description

technical field [0001] The invention belongs to the technical field of safe and stable operation of power grids, and in particular relates to a static safety evaluation method of a power system based on a probability flow. Background technique [0002] The large-scale grid-connection of renewable energy has brought many uncertain factors to the operation of the grid. At this time, it is necessary to obtain the characteristic quantities of the system operation (such as node voltage amplitude and phase angle, line active power and reactive power, etc.) through probabilistic power flow calculation. Statistical information, and then discover the weak link of system operation. Probabilistic power flow has been successfully applied in power system dynamic stability analysis, reliability analysis and so on. [0003] However, the existing probabilistic power flow has many limitations. The Monte Carlo method has the highest accuracy, but is the most time-consuming. Its results are g...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/06
Inventor 吴巍汪可友李国杰江秀臣冯琳韩蓓杭丽君
Owner SHANGHAI JIAO TONG UNIV
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