A Method of Power System Risk Assessment Based on Static Security Domain

A technology of static security domain and risk assessment, applied in the field of power system risk assessment based on static security domain, can solve the problems of power system risk assessment time-consuming, difficult to meet engineering needs, etc., to save unnecessary calculation, ensure accuracy, The effect of avoiding redundant calculations

Active Publication Date: 2017-09-01
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the huge number of scenarios, it is very time-consuming to conduct risk assessment on power systems with large-scale wind power access, and it is difficult to meet engineering needs

Method used

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  • A Method of Power System Risk Assessment Based on Static Security Domain
  • A Method of Power System Risk Assessment Based on Static Security Domain
  • A Method of Power System Risk Assessment Based on Static Security Domain

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Experimental program
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Embodiment

[0036] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments.

[0037] IEEE-30 node system including wind farm such as figure 2 shown. Among them, nodes 22 and 27 are respectively connected to a wind farm W1 with a capacity of 50MW and a wind farm W2 with a capacity of 80MW. The wind farm W1 and the wind farm W2 are controlled with a constant power factor of 0.99. The correlation coefficient matrix of is:

[0038]

[0039] It is assumed that the power prediction error of the wind farm in each period obeys a normal distribution, as shown in Table 1.

[0040] Table 1 Wind power probability prediction results

[0041]

[0042] The error of load forecasting is not considered, and the load value in all time periods is considered to be unchanged. The confidence level of the system risk is taken as β 1 = β 2 = β 3 = 0.95.

[0043] The power generation plan of conventional units is shown in Ta...

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Abstract

The invention provides a static safety domain-based power system risk assessment method. This method first selects the extreme value scenarios including the extreme value of wind farm output from the wind power output scenarios, and uses the extreme value scenarios to carry out risk pre-assessment on the power system. If no operational risk is found in the pre-assessment, the system can be considered safe and there is no need to use other scenarios for evaluation; Get accurate assessment results for all hazardous scenarios. While ensuring the accuracy of risk assessment, this method saves a large number of redundant calculations in security scenarios, improves the speed of risk assessment, and provides a time guarantee for timely discovery of potential risks in system operation.

Description

technical field [0001] The invention relates to a risk assessment method, in particular to a static security domain-based power system risk assessment method. Background technique [0002] Due to the inherent randomness, intermittency and volatility of wind power, large-scale wind power grid integration has brought new challenges to the stable operation of the grid, resulting in the transmission power of transmission lines, the output of some conventional units, and the system spinning reserve. The corresponding changes have a certain impact on the voltage stability and power quality of the grid. These risks increase rapidly with the increase of the proportion of wind power installed capacity in the grid, and change with the change of grid structure and operation mode. Therefore, it is necessary to provide a method for risk assessment of the power system connected to large-scale wind power to ensure the safety of system operation. [0003] In order to accurately simulate t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 刘德伟黄越辉王跃峰刘纯张楠高云峰许晓艳马烁李鹏礼晓飞李丽柳阳戴松霖刘延国马锁明崔正湃孙荣富王若阳
Owner STATE GRID CORP OF CHINA
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