Evaluation method for voltage support capability of multi-DC feed-in grid with dynamic reactive power compensation

Abstract

The invention discloses a method for evaluating the voltage supporting ability of a multi-direct current feed alternating current power grid provided with a dynamic reactive power compensation device. The method includes the following steps that: S1, a node admittance matrix of the alternating current power grid is established; S2, the node admittance matrix of the alternating current power grid is modified, so that a node admittance correction matrix can be obtained; S3, a node impedance matrix which is included into the influence of the dynamic reactive power compensation device is calculated; S4, voltage supporting ability evaluation indexes at direct current transmission system feed nodes to be investigated are calculated according to the node impedance matrix which is included into the influence of the dynamic reactive power compensation device; and S5, the voltage supporting ability at the direct current transmission system nodes to be investigated is evaluated according to the voltage supporting ability evaluation indexes and based on evaluation threshold values. With the method of the invention adopted, the node impedance matrix which is included into the influence of the dynamic reactive power compensation device is calculated, and therefore, the voltage supporting ability of the existing alternating current power grid which is provided with the dynamic reactive power compensation device can be reflected correctly, and decision-making support can be provided for the planning and operation of the power grid.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for evaluating the voltage support capability of a multi-direct current fed-in AC power grid with a dynamic reactive power compensation device. Background technique [0002] With the further increase in the number of direct current transmission projects, the capacity of direct current transmission will increase day by day. The large-scale access of the DC transmission system puts forward strict requirements on the voltage support capability of the AC grid. In order to enhance the voltage support capability of the AC grid, dynamic reactive power compensation devices are usually installed at the feed-in nodes of the DC transmission system and other key nodes. [0003] For the AC grid without dynamic reactive power compensation device, the multi-infeed short-circuit ratio index or multi-infeed effective short-circuit ratio index is often used to evaluate i...

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Problems solved by technology

[0005] In view of the deficiencies of the existing evaluation methods, the purpose of the present invention is to provide a method for evaluating the voltage support capability of multi-DC feeding AC grids with dynamic reactive power compensation devices, which calculates the node impedance affected by the dynamic reactive power compensation devices matrix, which aims to solve the problem that there is no effective index for evaluating the voltage support capability of AC power grids with dynamic reactive power compensation devices in this field

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