Two-layer planning optimization method of extended black start scheme to improve the security of recovery process

Abstract

The invention discloses an extended black-start scheme bi-level programming optimization method capable of improving the safety of a recovery process, provides a new idea for the recovery control of an initial stage after blackout, enables the safety factors affecting the recovery process to be introduced to an optimization target so as to improve the safety of an extended black-start scheme in anactual recovery process, gives consideration to the main-slave logic relation between unit recovery and path recovery, and achieves the building of an extended black-start scheme bi-level programmingoptimization model. The upper level optimization takes the maximum comprehensive efficiency of the scheme under the safety condition as the target, and a decision making variable is a started unit. The lower level optimization takes the solving of a recovery path, which contains a key path, is high in recovery safety and gives consideration to the recovery of an important load, as the target, anda decision making variable is a to-be-recovered path. A hybrid algorithm which combines an improved bacterial foraging algorithm with a shortest path method based on a Dijkstra algorithm is employedfor solving the model. The recovery process is higher in safety, the recovery effect is improved, and the method has the practical engineering application value.

Description

technical field [0001] The invention relates to a two-layer planning optimization method of an extended black start scheme for improving the safety of a recovery process, and belongs to the technical field of electric power systems. Background technique [0002] In recent years, the construction of smart grid has played an important role in improving the reliability of power grid operation, but the possibility of major blackouts still exists in the power grid under the influence of various internal faults and external disturbances. The research on power system recovery control can speed up the process of system recovery after a blackout, reduce the huge economic loss and social impact caused by the blackout, and is one of the important topics of power system security defense. [0003] According to the tasks and characteristics in different periods of the system recovery process, the system recovery process after a major power outage can usually be divided into three stages: ...

AI Technical Summary

Problems solved by technology

The black start stage is the initial stage of recovery. After the activated genset is successfully started, it can provide power support for subsequent recovery. The formed local small network is the basis for subsequent recovery, but it must be based on the successful recovery of the activated genset. If the activated genset If the recovery fails, the system recovery process will be delayed, causing greater losses

During the entire recovery process of the black start stage, due to operational risks such as overvoltage of the empty charging line, self-excitation of the black start power supply, excitation inrush current and overvoltage generated by the empty charging transformer, and system voltage drop and frequency drop caused by the startup of auxiliary equipment of the unit, any If one link does not meet the limit, it will cause recovery failure and the activated unit cannot be successfully started

Therefore, when formulating the recovery plan, it is necessary to ensure that the recovery process has a high degree of safety in order to facilitate the successful recovery of the unit, but it is still impossible to ensure the optimization of recovery efficiency while taking into account the requirements of safety

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