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A combined static and dynamic vulnerability assessment method of power grid considering the impact of new energy

A new energy and vulnerability technology, applied in electrical components, circuit devices, AC network circuits, etc.

Active Publication Date: 2021-11-23
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A combined static and dynamic vulnerability assessment method of power grid considering the impact of new energy
  • A combined static and dynamic vulnerability assessment method of power grid considering the impact of new energy
  • A combined static and dynamic vulnerability assessment method of power grid considering the impact of new energy

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Embodiment Construction

[0086] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0087] to attach figure 2 Taking the IEEE-39 example node system as an example, the static sorting of nodes with or without new energy power supply is simulated, the dynamic simulation of nodes with or without new energy power supply is carried out, and the comprehensive sorting results of the present invention are compared with existing methods in three aspects The validity of the application of the method proposed in the present invention in vulnerability assessment has been verified; the specific steps are as follows:

[0088] Step 1: According to the topology diagram of the IEEE-39 node system, simulate the static interval sorting of the nodes considering the new energy power supply;

[0089] The IEEE-39 node system contains 10 PV nodes and 28 PQ nodes, and node 31 is a balanced node. In the interval static interval sorting work, it is assumed that the p...

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Abstract

The invention discloses a static and dynamic combined vulnerability assessment method of a power grid considering the influence of new energy sources. In the static evaluation, the method considers the fluctuation of new energy power generation within a certain range, uses the interval number to represent the uncertainty of new energy, and proposes a minimum load shedding model based on interval DC power flow to calculate the interval static index of each node; in the dynamic evaluation , it is proposed to calculate the stability margin of each node based on the equivalent extension method of a single machine, and calculate the dynamic performance index of each node according to the positive or negative of the stability margin; finally, the two indexes are combined to sort the network nodes, analyze and evaluate the network nodes Vulnerability; this method can accurately and quickly identify the vulnerable nodes that combine the static and dynamic performance of the power grid under the access of new energy. Compared with the existing ranking methods, it is more in line with the actual operation of the power system under the access of new energy. The planning of new energy power sources in the smart grid provides guidance.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 李利娟马碧蔓吴军李媛
Owner XIANGTAN UNIV
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