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Asymmetric fault analysis method for AC/DC compound system

A fault analysis method and DC system technology, applied in the field of asymmetric fault analysis of AC-DC hybrid systems, can solve problems such as time-consuming simulation, inability to perform qualitative analysis, etc. Calculated effect

Active Publication Date: 2014-11-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Secondly, although it is possible to build an AC / DC hybrid system in electromagnetic transient simulation software and simulate various faults for accurate analysis, for large hybrid systems, the simulation takes a long time and qualitative analysis cannot be done

Method used

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  • Asymmetric fault analysis method for AC/DC compound system
  • Asymmetric fault analysis method for AC/DC compound system
  • Asymmetric fault analysis method for AC/DC compound system

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Embodiment Construction

[0054] The present invention will be described in further detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0055] Test the method proposed by the present invention and adopt the CIGRE Benchmark HVDC standard model, the model structure diagram is as follows figure 1 shown. The sending end of the CIGRE Benchmark standard model is not connected to the AC power grid, so only the receiving end DC system is modeled in the analysis. Set an asymmetrical fault at the commutation bus at the receiving end: Phase A is grounded through a 15Ω impedance. The equivalent value of the fault model containing only the receiving end is as follows figure 2 shown.

[0056] First, according to figure 1 For the CIGRE Benchmark model parameters provided, follow the sequence component method and impedance simulation method described in step...

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Abstract

The invention discloses an asymmetric fault analysis method for an AC / DC compound system. The asymmetric fault analysis method comprises the following steps of: modeling a fault of an AC system by a sequence component method and an impendence simulation method; building an asymmetric running fault model of a DC system; connecting an AC system fault model and the asymmetric running fault model of the DC system; solving the models by a secant method; and obtaining a final result. Compared with an electromagnetic transient simulation result, the method has the advantages of small error, fast analysis speed, high analysis accuracy, reliable convergence and the like.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to an asymmetrical fault analysis method for an AC / DC hybrid system which simultaneously solves an AC system fault model and a DC system model suitable for asymmetrical operating conditions. Background technique [0002] DC transmission has technical advantages such as large transmission capacity, long transmission distance, high controllability, and flexible operation, and there is no stability restriction problem due to transmission distance, and it has its advantages in long-distance large-capacity transmission and regional system interconnection. . With the vigorous advancement of the national smart grid construction, a number of DC transmission projects including the Xiangjiaba-Shanghai ±800 kV UHV DC transmission demonstration project have been put into operation, including the Xiluodu-Zhexi ±800 kV UHV DC transmission project A number of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00
CPCY02E60/60
Inventor 刘崇茹贠飞龙朱逸超郭龙赵云灏吴旻昊李庚银
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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