Power grid static and dynamic combination fragility assessment method involving new energy influence

Abstract

The invention discloses a power grid static and dynamic combination fragility assessment method involving new energy influence. The method comprises the following steps: considering the fluctuation ofnew energy power generation within a certain range in static assessment, adopting an interval number to represent the uncertainty of new energy, and providing the minimum load shedding model based onan interval direct current flow to calculate the interval static index of each node; in dynamic assessment, providing a single-chip microcomputer based equivalent extension method to calculate the stability margin of each node, and calculating the dynamic performance index of each node respectively according to the stability margin; and finally synthesizing the two indexes to rank the network nodes so as to assess the fragility of the network nodes. According to the method, the fragility nodes in combination with the static and dynamic performances of a power grid can be accurately and quickly recognized under the condition that new energy is accessed, compared with an existing ranking method, the method accords with the actual operation condition of an electric power system when the newenergy is accessed preferably, and a guiding function is provided for the planning of new energy power supplies in smart power grids.

Description

technical field [0001] The invention relates to the field of network node vulnerability assessment, in particular to a static and dynamic combination vulnerability node assessment method of the network considering the impact of new energy. Background technique [0002] Frequent blackouts at home and abroad have caused extremely serious social impacts and economic losses. Studies have shown that most of the blackouts are a series of cascading failures caused by the failure of some components, and the components that cause the initial failure of cascading failures are generally called These vulnerable sources play an important role in the stable operation of the power system. Identifying vulnerable sources in the system is an important part of vulnerability assessment; therefore, quickly and accurately locate the vulnerable sources in the system and construct vulnerability assessment indicators for The evaluation of the safety level of each link in the current system is of gre...

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Problems solved by technology

[0004] In recent years, new energy sources such as wind power and solar photovoltaic power generation have continued to grow rapidly, and their penetration rate in the power grid has been increasing day by day, gradually entering a stage of large-scale development. However, due to the unique randomness and volatility of new energy sources, high penetration of new energy The power supply brings new challenges to the security and stability of the power grid, including the assessment of the vulnerability of the high-penetration new energy grid, so how to accurately and quickly evaluate the static performance and dynamic performance of each node in the grid when new energy is connected to the grid Vulnerability assessment is particularly urgent and important

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