Multi-branch power flow transfer search algorithm based on virtual branch model and FTIL

Abstract

The invention provides a multi-branch power flow transfer search algorithm based on a virtual branch model and FTIL. The method includes the following steps: I, giving a virtual branch model of powerflow transfer under the condition of multi-branch breaking, and deriving a distribution factor calculation formula after multi-branch breaking based on a classic power flow foldback process; II, giving the definition of a generalized power flow transfer severe area based on FTIL, and converting the determination of a transmission section into the definition of a generalized power flow transfer severe area; III, giving a power flow transfer search algorithm based on an improved BFS, and introducing FTIL as a heuristic item to the termination condition of BFS to make the search automatically avoid areas with weak FTIL; and IV, carrying out multi-branch braking experiment on a new England 39 node system, obtaining the power flow increase of other branches in the network through PSASP simulation, and determining whether the error between the transferred power flow on the branches and the power flow increase obtained by PSASP software simulation is reasonable through analysis and calculation.

Description

technical field [0001] The invention relates to the field of power system protection and safety control, specifically, a multi-branch power flow transfer search algorithm based on a virtual branch model and FTIL. Background technique [0002] With the continuous expansion of the scale of the modern power grid, the requirements for the safety and stability of the system are continuously improved, but major blackouts occur from time to time. The analysis of the "7.30" and "7.31" blackouts in India in recent years shows that due to factors such as maintenance and failure before the failure, there are many outage lines in the power grid, and the power grid structure is seriously weakened; at this time, the distance protection of the Bina-Gwalior I line is incorrect. The power flow shifted due to the action, which caused the Bhinmal-Sanchore and Bhinmal-Dhaurimanna lines to trip one after another, and the northern and western power grids were disconnected, which aggravated the po...

AI Technical Summary

Problems solved by technology

The analysis of the "7.30" and "7.31" blackouts in India in recent years shows that due to factors such as maintenance and failure before the failure, there are many outage lines in the power grid, and the power grid structure is seriously weakened; at this time, the distance protection of the Bina-Gwalior I line is incorrect. The power flow shifted due to the action, which caused the Bhinmal-Sanchore and Bhinmal-Dhaurimanna lines to trip one after another, and the northern and western power grids were disconnected, which aggravated the power flow in the internal section of the eastern power grid, and the lines continued to trip, which caused a series of serious accidents and eventually led to the collapse of the power grid

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