AC/DC hybrid power grid cascading failure simulation method

Abstract

The invention discloses an AC / DC hybrid power grid cascading failure simulation method. The method comprises the steps of S1, determining parameters of a power grid; S2, performing cyclic simulation on the power grid, improving the capacity and the load level of a generator according to a certain proportion compared with previous simulation, and increasing the capacity of a faulted line in the previous simulation according to a certain proportion; S3, disconnecting all lines according to a certain probability in each time of simulation; S4, carrying out power flow optimization on the disconnected power grid, judging whether a line reaches a heavy load or not, if the line reaches the heavy load, entering S5, and otherwise, entering S6; s5, disconnecting the heavy-load line according to a certain probability, if a new line is disconnected, repeating S4, otherwise, entering S6; and S6, judging whether the number of simulation times reaches a preset number or not, if yes, ending the simulation, and otherwise, repeating S2. The cascading failure simulation method provided by the invention can consider the DC line model and the DC protection measure, and is suitable for cascading failuresimulation of the AC / DC hybrid power grid.

Description

technical field [0001] The invention relates to the field of electrical engineering, and more specifically, to a simulation method for cascading faults of an AC / DC hybrid power grid. Background technique [0002] Under the background of my country's vigorous construction of AC-DC UHV interconnected power grids, with the increasing scale of power grids and the construction of UHV AC-DC transmission projects, the transmission power of the system is gradually increasing, and the system dynamics are becoming more and more complex. The operation safety of the AC-DC hybrid grid under great threat. On the other hand, the uncertain factors in the system are gradually increasing, and problems such as power imbalance, instability, and oscillation of the local power grid caused by factors such as faults and weather may spread, resulting in chain failures and even large-scale blackouts. Studies have shown that power system blackouts are generally caused by the chain reaction of a series...

AI Technical Summary

Problems solved by technology

[0003]Aiming at the defects of the prior art, the purpose of the present invention is to solve the problem that the traditional cascading failure OPA simulation method can only be applied to pure AC systems, and cannot perform AC-DC hybrid power Technical Problems of System Cascading Failure Analysis

Images