Prevention and control optimization decision method based on offline strategy online check of security control system

Abstract

The invention discloses a prevention and control optimization decision method based on offline strategy online check of a security control system. Firstly, according to the real-time status of the security control system and the offline policy model parameters, the on-duty strategy of each defended fault is identified; and then, aimed at the real-time status of the grid, security check is carriedout on each fault on-duty strategy, and the fault with transient or dynamic or static security and stability margin is used as a risk fault; after that, aimed at the real-time status of the grid, theminimum of the sum of the prevention and control cost and the emergency control cost of fault probability is taken as an objective function to calculate a prevention and control optimization decisionthat satisfies the security and stability requirements of the grid under all risk faults; the security check of other faults defended by the security control system is carried out for the prevention and control optimization decision, until, through iteration, all the faults defended by the security control system under the prevention and control optimization strategy meet the requirements of secure and stable operation of the grid after the faults, thereby avoiding the grid security risk of insufficient offline strategy control quantity or mismatch.

Description

technical field [0001] The invention relates to the technical field of power grid dispatching operation and control, in particular to a preventive control optimization decision-making method based on an offline policy online check of a safety control system. Background technique [0002] The "Guidelines for the Safety and Stability of Power Systems" defines three levels of safety and stability standards for power system operation and control according to the severity of faults. After serious faults in the series, under the condition of correct operation of protection, switch and reclosing, it should be able to maintain stable operation, and it is allowed to take stable control measures such as machine cutting and load shedding when necessary. The safety control system of the present invention is set up to meet the requirements of the second-level safety and stability standards. [0003] Due to the uncertainties in time and space of load, power generation, and grid structure...

AI Technical Summary

Problems solved by technology

Although the offline strategy is formulated based on conservative principles, due to the many factors affecting the security and stability of the power grid, and the complex characteristics of the power grid security and stability, only relying on the offline strategy to defend against failures required by the second-level security and stability standards still has power grid security risks.

[0004] As the scale of cross-regional power transmission continues to increase, the security and stability characteristics of the power grid are more complex, the integration of the power grid, and the interweaving of multiple types of security issues are prominent, and the safety risk of the power grid due to the mismatch of the off-line strategy of the security control system is increasing.

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