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Direct current (DC) drop point selection method for alternating current (AC)-DC system based on stability and economical efficiency

An AC/DC system, DC drop point technology, applied in power transmission AC network and other directions, to achieve the effect of easy implementation, simple and clear form, and easy calculation

Active Publication Date: 2012-02-15
国网江西省电力有限公司电力科学研究 +1
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Problems solved by technology

However, considering the various factors of the AC-DC system interaction, the method of selecting the DC drop point of the AC system at the receiving end and its evaluation still need a lot of research work

Method used

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  • Direct current (DC) drop point selection method for alternating current (AC)-DC system based on stability and economical efficiency
  • Direct current (DC) drop point selection method for alternating current (AC)-DC system based on stability and economical efficiency
  • Direct current (DC) drop point selection method for alternating current (AC)-DC system based on stability and economical efficiency

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Embodiment Construction

[0030] The preferred embodiments will be described in 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.

[0031] In this method, the effective short-circuit ratio (ESCR), the static voltage stability index (VSI) and the network loss (Power Loss) are considered as the consideration factors for the selection of the DC drop point, so as to take into account both stability and economy. Firstly, in the power system simulation software PSD-BPA, the three indicators of the nodes that can be selected by the receiving end system are calculated, and then the nodes that can be selected by the receiving end are preliminarily screened by the critical effective short circuit ratio (CESCR), and the ESCR less than CESCR is excluded. of nodes. The specific expression of CESCR is obtained from the characteristic equation of the whole model...

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Abstract

The invention discloses a direct current (DC) drop point selection method for an alternating current (AC)-DC system based on stability and economical efficiency, and belongs to the technical field of power system operation and control. According to the technical scheme, the method comprises the following steps: taking three indexes, namely effective short circuit ratio (ESCR), static voltage stability index (VSI) and power loss of a receiving-end power grid as consideration factors of DC drop point selection, and carrying out simulation calculation on the three indexes of optional nodes in a receiving-end AC system by adopting power system simulation software PSD-BPA; calculating critical ESCR (CESCR) according to actual parameters of the AC-DC system, and excluding the nodes the ESCR of which is smaller than CESCR so as to complete preliminary screening of DC drop points; performing normalizing treatment; establishing a target function; determining weight coefficients; calculating target function values corresponding to the nodes; and finally selecting the optimum drop point as a converter bus at an inverter side. The DC drop point selection method is applicable to the selection of the DC drop points in the large AC-DC system.

Description

technical field [0001] The invention relates to a method for selecting a DC drop point of an AC-DC system with both stability and economy in mind, and belongs to the technical field of power system planning. Background technique [0002] With the implementation of the west-to-east power transmission strategy and the acceleration of the pace of the national interconnected grid, long-distance large-capacity power transmission is imperative, and AC-DC combined transmission has become an inevitable trend in the development of modern power systems, so the research on the interaction of AC-DC systems is becoming more and more more and more important. [0003] DC drop point selection refers to the selection of nodes in the AC system that can be used as the converter bus from the perspective of optimal operation of the AC and DC system, and realizes the optimization of the stable and economical operation of the AC and DC system under the constraints of various safety indicators. Wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 蔡恒刘崇茹王康韩民晓王伟杨超钟士元
Owner 国网江西省电力有限公司电力科学研究
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