Multi-terminal flexible direct-current transmission receiving-end power grid access point selection method and system

Abstract

The invention discloses a multi-terminal flexible direct-current transmission receiving-end power grid access point selection method and system. The method comprises the steps: selecting key areas ina receiving-end power grid and alternative substations with flexible direct-current access conditions in the key areas; selecting one alternative substation from each key area to form an access scheme; counting the path length of a newly-built line required by each access scheme, calculating and counting the network loss and area short-circuit current level of each access scheme, constructing a path length matrix, a network loss matrix and a maximum short-circuit current matrix of the newly-built line, carrying out normalization processing, constructing a multi-terminal flexible direct-currentaccess scheme target function, and solving the minimum value of the target function; and obtaining an optimal alternative substation scheme of multi-terminal flexible direct-current access. The invention also discloses a corresponding method. The method can provide reference for planning and construction of flexible direct-current power transmission and point selection of the flexible direct-current power transmission in an actual power grid.

Description

technical field [0001] The invention relates to a method and system for selecting an access point of a multi-terminal flexible direct current transmission receiving end grid, belonging to the technical field of flexible direct current transmission. Background technique [0002] Against the backdrop of global energy transformation, the energy production and consumption structure is transforming towards a cleaner and lower-carbon environment. my country's energy resources are in short supply, and there is a phenomenon of unbalanced distribution of resources and regional development. In the developed eastern regions of my country, the electricity load is heavy and the electricity shortage is serious. It is necessary to introduce a large number of incoming electricity from outside the region, and clean electricity resources are in short supply. The state actively promotes long-distance transmission of western hydropower and wind-fired bundled clean power to areas with heavy loa...

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Problems solved by technology

[0004] At present, the plan for multi-terminal flexible direct access to the grid is similar to conventional power supply planning. Through empirical analysis, however, for the selection of multi-terminal flexible direct drop point, the access plan is often not considered comprehensively, and there is no clear index for measurement. The recommended plan is not necessarily best

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