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Multi-terminal flexible direct system static safety analysis method taking direct current network fault power into consideration

A technology for static safety analysis and DC network, applied in the field of static safety analysis of multi-terminal flexible DC systems

Active Publication Date: 2018-11-13
NARI TECH CO LTD +4
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  • Abstract
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  • Application Information

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Problems solved by technology

The actual application of the existing dispatching system in soft-straight modeling, soft-straight power flow calculation, and soft-straight online safety analysis is still in the application research stage

Method used

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  • Multi-terminal flexible direct system static safety analysis method taking direct current network fault power into consideration
  • Multi-terminal flexible direct system static safety analysis method taking direct current network fault power into consideration
  • Multi-terminal flexible direct system static safety analysis method taking direct current network fault power into consideration

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Embodiment Construction

[0052] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0053] Such as figure 1 As shown, the purpose of the present invention is to propose a static safety analysis method for a multi-terminal flexible DC system considering the fault power of the DC network, and to establish a steady-state power flow calculation model considering the control mode for the multi-terminal flexible AC-DC hybrid system; System operation mode, constructing the expected fault set of the DC system, giving priority to the transfer between poles in the converter station, taking into account the power coordination strategy between the converter stations, realizing the readjustment of the DC network power, and maintaining the stab...

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Abstract

The invention discloses a multi-terminal flexible direct system static safety analysis method taking a direct current network fault power coordination distribution strategy into consideration; a steady-state power flow calculation model taking a control mode into consideration is established specific to a multi-terminal flexible alternating-current and direct-current hybrid system; an anticipatedfault set of the direct-current system is established according to the operation mode of the multi-terminal flexible direct system; the inter-pole rotation of a converter station is considered in priority, a power coordination strategy among the converter stations is considered, the power of the direct-current network is re-adjusted, and a direct-current voltage is kept stable; according to the basic-state power flow result, a direct-current filtering method is adopted to construct a serious anticipated fault set of the alternating-current system; and based on an alternating iteration alternating-current and direct-current power flow algorithm, and by considering the primary frequency modulation characteristics of an alternating-current power grid unit and a load, the mutual influence of an alternating current fault or a direct current fault on the alternating current and direct current hybrid system is analyzed, and pre-warning is carried out on the potential safety risk analysis of the alternating-current and direct-current system by correcting and verifying the equipment out-of-limit and heavy-load conditions of the alternating-current and direct-current system.

Description

technical field [0001] The invention relates to the technical field of electric power system automatic dispatching, in particular to a static safety analysis method of a multi-terminal flexible DC system considering fault power of a DC network. Background technique [0002] With the rapid development of renewable clean energy such as wind power and solar energy, VSC-based multi-terminal flexible DC transmission technology has become an effective technical means to solve the problem of distributed new energy grid connection and consumption. Power supply, DC power distribution in large cities and other fields have broad application prospects. With the gradual increase of DC transmission projects, the traditional power grid will be in a more complex operating state, and the network topology will become increasingly complex. After the multi-terminal flexible DC system is widely put into operation in the dispatching application system, the demand for the safety risk analysis fun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 陆娟娟王毅闪鑫陆进军查国强罗玉春杨科彭龙曹国芳
Owner NARI TECH CO LTD
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