Method and device for determining stability of alternating current and direct current system in direct current hierarchical access mode

An AC/DC system, layered access technology, applied in the field of power systems, can solve the problems of cumbersome steps and low efficiency

Inactive Publication Date: 2019-07-12
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a method and device for determining the stability of an AC-DC system under a DC layered access mode, so as to overcome the cumbersome steps and low efficiency existing in the current analysis method for system voltage stability under a DC layered access mode The problem

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  • Method and device for determining stability of alternating current and direct current system in direct current hierarchical access mode
  • Method and device for determining stability of alternating current and direct current system in direct current hierarchical access mode
  • Method and device for determining stability of alternating current and direct current system in direct current hierarchical access mode

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[0084] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0085] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention provides a method and a device for determining the stability of an alternating current and direct current system in a direct current hierarchical access mode. The method comprises the following steps of: determining all n drop points accessed into an alternating current commutation bus in a direct current mode in the alternating current and direct current system; based on the Thevenin's equivalence method, establishing an equivalent node impedance matrix Zeq of the alternating current and direct current system, and determining each feature value [lambda]I of the equivalent node impedance matrix Zeq, wherein 1<=i<=n; and according to the minimum value in the reciprocal values of the absolute values of the feature values [lambda]I, determining the stability of the alternating current and direct current system. The method can rapidly and accurately determine the stability of the multi-direct current feed alternating current and direct current system in the direct current hierarchical access mode.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for determining the stability of an AC-DC system under a DC layered access mode. Background technique [0002] At present, the AC-DC system including multiple DC infeeds is widely used in my country's power grid. The stability of the AC-DC system is often a concern. [0003] Specifically, while the DC transmission system provides active power to the AC system at the receiving end, the converter also needs to consume a large amount of reactive power (about 40%-60% of the DC transmission power). "Load characteristics" will affect the voltage stability of the receiving end system. [0004] Especially during the fault period, or when the reactive power compensation of the AC system at the receiving end is insufficient, the large amount of reactive power absorbed by the DC may cause the voltage of the AC system to drop; in turn, it will cause the commutatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 林伟芳易俊汤涌仲悟之余芳芳
Owner CHINA ELECTRIC POWER RES INST
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