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Safety level evaluation method of power grid

A security and power grid technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of not considering the consequences and not coordinating safety and economy well

Active Publication Date: 2012-11-07
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Application Information

AI Technical Summary

Problems solved by technology

2. The probability assessment method considers the probability of accidents, but does not consider the consequences of accidents, and does not coordinate the relationship between safety and economy well
There is currently no method for assessing the level of grid security

Method used

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  • Safety level evaluation method of power grid
  • Safety level evaluation method of power grid
  • Safety level evaluation method of power grid

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Embodiment Construction

[0041] The present invention defines the risk index of the system as the product of the probability of an accident and the consequence of the accident, that is, the severity, and the expression is as follows:

[0042] (1)

[0043] In the formula, for t the way time works; for the first j possible load levels; Yes t time appears probability of load level; for the first i an uncertain disturbance; for the likelihood of disturbances occurring; is in and The severity of system losses under disturbances. From equation (1), it can be seen that there are two key models for risk-based safety assessment: a model representing uncertainty and a model representing failure severity.

[0044] Utility is intended to be a subjective feeling, a degree of satisfaction of a subjective desire. Utility value is a relative dimensionless indicator. Generally, it can be stipulated that the utility value of the thing that the decision maker likes the most, the most...

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Abstract

The invention relates to a safety level evaluation method a power grid, comprising the following steps of: firstly determining a supposed accident list, and sequentially disconnecting elements of the supposed accident list; after a certain element is disconnected, carrying out topological structure analysis and load flow calculation on a system, and then calculating a power grid loss load risk evaluation index, a power grid overload risk evaluation index, a power grid low voltage risk evaluation index and a power grid voltage collapse risk evaluation index; repeating the process till all the elements of the supposed accident list are completely calculated; and then calculating a system single-risk evaluation index and a system total-risk evaluation index. The invention introduces a risk theory and a utility theory to the safety evaluation of the power grid, separately diagnoses the safety of the system from different side surfaces, further obtains the risk evaluation index of the whole system by an analytic hierarchy process (AHP), obtains simple and clear results and has better discrimination and can reflect the occurrence possibility of different accidental accidents and severity degree of a consequence caused by the accidental accidents.

Description

technical field [0001] The invention relates to a method for evaluating the safety level of a power grid, and belongs to the application field of the electrical industry. Background technique [0002] The research on power system security has gone through three main stages: deterministic assessment method, probabilistic assessment method and risk assessment method. 1. Deterministic safety assessment methods have been widely used in the power industry, but the use of this method must pay extra costs, and the results are too conservative because only the most serious and most credible accidents are emphasized. Therefore, from an operational point of view, the existing equipment is not fully utilized; from a planning point of view, unnecessary duplication of construction is caused. With the gradual rise of the power market, under the fierce competition, various power suppliers are reluctant to invest in new equipment, but are more willing to expand the transmission limit of ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 王国栋刘若溪郭志民邢子涯张建华
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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