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Safety level evaluation method of power grid

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

Active Publication Date: 2010-08-11
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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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] In the present invention, the risk index of the system is defined as the product of the probability of accident occurrence 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 disturbance. It can be seen from formula (1) that there are two key models for risk-based safety assessment: a model representing uncertainty and a model representing the severity of faults.

[0044] Utility is intended to be a subjective feeling, a degree of satisfaction of subjective wishes. Utility value is a relative dimensionless indicator. Generally, it can be stipulated that the utility value of the decision-maker's favorite, most incline...

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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 assessing the safety level of a power grid, which 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, probability assessment method and risk assessment method. 1. The deterministic safety assessment method has been widely used in the electric power industry. However, using this method must pay extra costs. Because only the most serious and most credible accidents are emphasized, the result is too conservative. Therefore, from the perspective of operation, the existing equipment is not fully utilized; from the perspective of planning, unnecessary redundant construction is caused. With the gradual rise of the electricity market and under the fierce competition, various electricity suppliers are unwilling to invest in new equipment, but are more willing to expand the transm...

Claims

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Application Information

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Patent Type & Authority Applications(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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