Hybrid direct-current transmission receiving-end power grid access method and system

Abstract

The invention discloses a hybrid direct-current power transmission receiving-end power grid access method and system. The method comprises the steps of calculating a key section tide change rate matrix and a direct-current multi-infeed short-circuit ratio change rate matrix when conventional direct current is accessed to different alternative substations; calculating a key section power flow change rate, a limited bus short-circuit current change rate and an alternative substation bus voltage change rate matrix when the flexible direct current is connected to different alternative substations,and normalizing the change rate matrix; and constructing a hybrid direct-current access receiving-end power grid scheme optimization model, and solving the hybrid direct-current access receiving-endpower grid scheme optimization model to obtain an optimal alternative substation scheme. According to the invention, the hybrid DC network access optimization problem is converted into the single function network access optimization problem, the calculation is simpler and faster, and reference can be provided for planning and construction of DC power transmission and drop point selection of DC power transmission in an actual power grid.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a hybrid direct current transmission receiving-end grid access method and system. Background technique [0002] my country's energy shortage, especially in areas with heavy loads, is seriously short of electricity, often requiring a large number of incoming electricity from outside the region. At present, the country is actively promoting the long-distance transmission of large-capacity power sources such as hydropower and thermal power to areas with heavy loads. High-voltage direct current transmission (HVDC) has a good application prospect in the occasion of long-distance power transmission and grid connection. [0003] Conventional high-voltage direct current transmission (LCC-HVDC, that is, high-voltage direct current transmission based on phase-controlled converters) has been widely used in high-power long-distance transmission. However, the access of a...

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Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention provides a hybrid direct current transmission receiving end grid access method and system, which solves the problems of instability of the grid in areas where multiple direct currents are placed and cumbersome calculations in the prior art. Quickly and effectively select the planning of hybrid DC in the power grid in the area near the drop point

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