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Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems

A DC system, AC and DC technology, applied in the direction of AC network circuit, power transmission AC network, electrical components, etc., can solve the problem of difficulty in establishing node impedance matrix

Active Publication Date: 2010-11-24
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

However, it is difficult to establish the node impedance matrix in the actual power system

Method used

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  • Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems
  • Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems
  • Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems

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Embodiment Construction

[0063] The evaluation index and method proposed in the present invention, from both static and dynamic perspectives, firstly, according to the fixed electrical connection of the AC and DC power grid, the coupling impedance between the AC and DC is calculated by using the power network equivalent method, and the connection point of the DC system is determined through the calculation. The magnitude of the coupling impedance between each AC channel and the AC section and its inherent relationship, in order to propose a static coupling degree index that can directly reflect the essential characteristics of the interaction of the AC-DC parallel / hybrid system, which has universal significance and is suitable for different power grids. On this basis, in order to further illustrate the dynamic characteristics of the AC-DC power grid, the AC-DC dynamic coupling index based on the AC-DC power flow transfer factor is defined to describe the dynamic characteristics of the AC-DC interaction,...

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Abstract

The invention provides a set of alternating current-direct current (AC-DC) coupling assessment index capable of reflecting electrical characteristics and moving dynamic characteristics of AC-DC parallel / series-parallel systems, which comprises a static coupling index and a dynamic coupling index. The AC-DC coupling assessment index is suitable for assessing interaction relationship, safety and stability of an AC system and a DC system in a multi-cycle DC-containing complex large-area AC / DC series-parallel system or an AC / DC parallel system with a relatively simple grid structure, can be used for AC / DC power grid planning and running control, provides direct basis for selecting signals of AC / DC coordination control or multi-cycle DC system coordination control, and solves the key technical problems of indefinite analysis target and difficult control object selection of the conventional research method applied to safety and stability analysis and control of the AC / DC parallel / series-parallel power transmission system and the like.

Description

technical field [0001] The invention relates to stable operation and control of an AC / DC power system, in particular to a coupling evaluation method for judging the mutual influence of an AC / DC parallel / hybrid system. Background technique [0002] AC-DC parallel / hybrid connection has become one of the most important forms of power transmission in power systems. However, in actual engineering, there are few simple AC-DC parallel systems consisting of an AC line and a DC circuit; usually in AC-DC In the parallel / hybrid system, the AC channel in parallel with the DC system is composed of multiple AC lines or an AC grid with a more complex grid topology; in addition, there will be multiple DC systems and multiple AC channels. The line or grid is in the form of AC and DC hybrid connection in parallel state. Therefore, the interaction and stability control issues of AC / DC parallel / hybrid systems have become quite complicated. The application of existing research methods in the sa...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/00
CPCY02E60/60
Inventor 郭小江郑超马世英卜广全尚慧玉
Owner CHINA ELECTRIC POWER RES INST
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