Grid Frequency Adaptive Emergency Control Method Considering Transmission Section Limit

Abstract

The invention discloses a power grid frequency adaptive emergency control method based on power transmission section limits and belongs to the electric power system safety stabilization control technology field. According to the method, controllable measures are grouped according to unit active control cost and power transmission section active sensitivity, the minimum control cost is the goal, on the condition that the total offline measure quantity is unchanged, based on power transmission section safety stabilization limit constraints, controlled variables of each controllable measure group are calculated, and the controllable measure groups and the corresponding controlled variables are decomposed to acquire specific controllable measures and the corresponding controlled variables which are taken as online emergency control strategies. The method is advantaged in that through check after fault on online strategy timeliness, control system pressure plate state consistency and a total online measure quantity and total offline measure quantity deviation degree, online strategy and offline strategy selection is carried out, and power grid frequency adaptive emergency control is realized.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability control. More precisely, the invention relates to a method for self-adaptive emergency control of power grid frequency taking into account the safety and stability limit of the power transmission section. Background technique [0002] When the proportion of the active power loss or surplus caused by the fault to the grid load or power generation exceeds a certain range, there will be a frequency security problem in the grid. In order to ensure the frequency safety of the power grid after a high-power impact, it is necessary to implement emergency power modulation of the DC system between the sending and receiving end grids as soon as possible when a high-power impact is detected, and to shed loads or generators to suppress the rapid drop in grid frequency or rise, prevent the further evolution of the fault, and reduce the safety risk of fault handling. [0003] The liter...

AI Technical Summary

Problems solved by technology

Since this method does not check online whether the change of power flow distribution after the implementation of specific measures will lead to a safer and more stable limit for the power flow at the transmission section, the mismatch between the actual operating state of the power grid and the offline research method is large, especially the power flow difference between power grid partitions When the DC system participates in frequency emergency control, it is entirely possible that the grid frequency emergency control system based on off-line strategy control will cause the transmission section to be safer and more stable.

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