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A fast dynamic simulation method for cascading faults in AC and DC power grids

A technology of dynamic simulation and cascading faults, which is applied to electrical components, emergency protection circuit devices, etc., and can solve the problems that the cascading fault model is not applicable to AC and DC hybrid power grids

Active Publication Date: 2017-02-15
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of the prior art, the purpose of the present invention is to provide a fast dynamic simulation method for cascading faults suitable for AC-DC power grids to solve the problem that the cascading fault models in traditional pure AC power grids are not suitable for AC-DC hybrid power grids

Method used

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  • A fast dynamic simulation method for cascading faults in AC and DC power grids
  • A fast dynamic simulation method for cascading faults in AC and DC power grids
  • A fast dynamic simulation method for cascading faults in AC and DC power grids

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Embodiment 1

[0039] Such as figure 1 As shown, the fast dynamic simulation method for cascading faults of AC and DC power grids provided in this embodiment includes the following steps:

[0040] Step 1: Initialize the power grid, determine generator output, load demand and grid structure.

[0041] After the power flow calculation for a given power grid, the voltage and power flow distribution of each node in the network can be obtained. The power flow calculation and stability calculation program used in the present invention is the BPA transient stability program version 4.27.5 of China Electric Power Research Institute.

[0042] Step 2: Simulate random first faults. The first faults are divided into AC line faults, DC line faults, generator faults, or several of them occur simultaneously or successively.

[0043] In order to obtain the fault chain of cascading faults as soon as possible, the selected initial faults are randomly obtained within a limited range, rather than the nodes and...

Embodiment 2

[0063] In this embodiment, an actual regional power grid is taken as an example, and a cascading fault simulation method is adopted for cascading faults of an AC and DC power grid.

[0064] Step 1: Initialize the power grid, determine generator output, load demand and grid structure.

[0065] The local wiring diagram of the system is as follows: figure 2 shown. figure 2 In , the line power is double-circuit power, the direction is shown by the arrow, and the node voltage is within the normal range, so it is not marked. Nodes 3, 7, 17, 22, and 25 are 500kV DC converter stations, node 9 is a 220kV DC converter station, and the remaining nodes are 500kV AC substations.

[0066] Step 2: Simulate random first faults. The first faults are divided into AC line faults, DC line faults, generator faults, or several of them occur simultaneously or successively.

[0067] The first fault selects the successive faults of cross-over lines. At 0.2 seconds, the DC line flowing into node ...

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Abstract

The invention provides a cascading fault fast dynamic simulation method applicable to an alternating current-direct current power grid. The method is used for solving cascading fault paths of a system. The fast dynamic simulation method includes the following steps that: A, the power grid is initialized, and the generated output, load requirement and grid structure of a generator are determined; B, random initial faults are simulated, wherein the random initial faults include alternating current line faults and / or direct current line faults and / or generator faults; C, whether the system collapses after the initial failures occur is judged; if the system collapses, simulation is terminated; if the system does not collapse, the method enters step D; D, k-th calculation is performed, namely, alternate decoupling stability calculation is performed on the alternating current-direct current system, and a lower-level fault is simulated; E, whether the system collapses after the lower-level fault occur is judged; if the system collapses, simulation is terminated, and it is confirmed that cascading faults occur on the system; if the system does not collapse, 1 is added to K, and the method enters step D iterative calculation; and F, when K is equal to Kmax, simulation is terminated, and it is judged that cascading faults will not occur on the system. With the simulation method of the invention adopted, the problem that a cascading fault model in a traditional pure alternating-current power grid is not suitable for an alternating current-direct current power grid can be solved.

Description

technical field [0001] The invention relates to a fast dynamic simulation method for cascading faults suitable for AC and DC power grids. Background technique [0002] The development of the electric power industry is an important symbol of the economic development level of the whole country. With the acceleration of industrialization and the development of high-tech industries, the demand for electric energy continues to increase. However, due to regional differences in economic and social development and uneven distribution of natural resources, load centers and power sources are often far apart. The development of technologies such as UHV DC transmission has effectively alleviated the above-mentioned problems on the one hand, and on the other hand, it has also made the grid structure and operation mode more and more complex. Certain faults in the local grid are more likely to spread to adjacent regional grids and induce cascading failures. , leading to large-scale power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/28
Inventor 刘蔚刘文颖赵勇蔡万通陈刚刘宇石陈雁叶湖芳
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD