Cascading failure sequence identification method for alternating-current and direct-current hybrid power grid

Abstract

The invention discloses a cascading failure sequence identification method for an alternating-current and direct-current hybrid power grid. The method specifically comprises the steps of carrying out initial failure selection and index construction, and from an alternating-current and direct-current influence relation, a power flow operation condition, an alternating-current and direct-current connection relation and a local network topology structure, constructing a multi-infeed interaction factor index, a weighted power flow entropy index, a multi-infeed short-circuit ratio index and a link prediction index; constructing a model with fixed index weight; determining a utility function, a target function and a constraint condition corresponding to the index in combination with a non-cooperative game theory and the characteristics of the index; ending the prediction condition of the cascading failure sequence of the alternating-current and direct-current hybrid power grid: if the power grid is split or the cascading failure sequence reaches the maximum, ending the prediction; and if not, repeating the steps 2-4 till that the condition is met. Chain accident chain prediction is facilitated, and an effective guidance effect is achieved for engineering practice.

Description

technical field [0001] The invention belongs to the technical field of safe operation of power systems, and relates to a method for identifying cascading fault sequences of an AC / DC hybrid power grid. Background technique [0002] The geographical distribution of energy resources and regional economic development in China presents an unbalanced characteristic. In order to promote the rational and efficient use of energy resources, my country's power grid has gradually developed into a long-distance, large-capacity, large-scale AC-DC hybrid power grid. If there is a small disturbance in the hybrid power grid, the fault will spread and cause cascading faults, which will develop into a large-scale power outage. [0003] At present, most of the researches on cascading failure simulation models focus on pure AC systems, and there are few blackout models considering the influence of DC transmission systems. For example, a cascading fault sequence prediction method based on the Ma...

AI Technical Summary

Problems solved by technology

However, many of the existing cascading fault outage models of AC / DC hybrid systems are based on the dynamic simulation process of simulation software, the search process takes a long time, and the characteristics of the cascading fault chain cannot be fully grasped.

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