Cascading failure emergency blocking method based on accident chain model

Abstract

The invention discloses a cascading failure emergency blocking method based on an accident chain model. The method comprises the following steps: firstly offline computing and searching a high-risk accident chain by using a electromechanical transient time domain simulation method based on actual power grid data, screening out an accident chain set with first two accidents unconfigured with emergency control measure from the high-risk accident chain by considering the existing emergency control system configuration information; secondly, configuring the emergency control policy for the secondaccident of this class accident chain by adopting the offline computing method, and ensuring that the cascading event evolution process can be blocked; and finally, determining the continuous definitehappening of the first and the second accidents in the accident chain as the necessary condition for triggering the emergency control measure on the basis of accomplishing the real-time matching of the operation way by the emergency control system, wherein the economy and the timeliness of the control are both taken into consideration. Through the method disclosed by the invention, the cascadingfailure caused by the continuous disturbance development unconfigured with the emergency control measure can be timely blocked, the miss of the control opportunity is avoided, and the system loss is reduced.

Description

technical field [0001] The invention relates to an emergency blocking method for cascading faults based on a fault chain model, and belongs to the technical field of power system automation. Background technique [0002] The rapid development of UHV DC transmission and new energy technology has realized the function of optimizing the allocation of large-scale energy resources, and met the urgent needs of clean energy transmission, energy conservation and emission reduction. The characteristics of my country's energy resources determine that my country's new energy adopts centralized development and centralized delivery. Taking my country's Northwest Power Grid as an example, as of the end of 2017, 8 circuits of direct current have been put into operation, with a total rated capacity of more than 40 million kilowatts. At the same time, large-scale new energy clusters are gathered in The near zone of the DC cluster. However, according to the "Notice on Further Controlling Coal...

AI Technical Summary

Problems solved by technology

However, in the scenario of large-scale new energy and multiple DC transmission grids, according to the existing control configuration principles, there are no emergency control measures under certain disturbances (such as DC commutation failure, wind turbine off-grid, etc.), but this disturbance may further lead to subsequent Disturbance, and then lead to cascading failures, according to the configuration of the existing emergency control system will eventually miss the control opportunity, greatly increasing the system loss

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