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Flow-based voltage supporting ability evaluation method of multi-infeed direct-current receiving-end power grid

A technology of multiple DC feed-in and receiving-end power grids, applied in the field of power systems, can solve problems that cannot be directly applied

Inactive Publication Date: 2015-12-09
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is currently no effective method to evaluate the voltage support capability of multi-DC feed-in receiving end grids equipped with dynamic reactive power compensation devices.
Since the multi-infeed effective short-circuit ratio index does not include the influence of dynamic reactive power compensation device, it cannot be directly applied
[0004] An evaluation method for voltage support capability applicable to general multi-DC infeed-receiving-end power grids needs to be proposed

Method used

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  • Flow-based voltage supporting ability evaluation method of multi-infeed direct-current receiving-end power grid

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Embodiment 1

[0039] refer to figure 1 , which is a flow chart of the method for evaluating the voltage support capability of the multi-DC feed-in receiving end power grid based on power flow calculation in this embodiment. As shown in the figure, the method of this embodiment includes the following steps in sequence:

[0040] A. Perform power flow calculation for multiple DC feed-in and receiving-end power grids. The schematic diagram of the simulation model in this embodiment is as follows figure 2 shown. Among them, the rated power of DC system 1 is 1; the rated power of DC system 2 is 2. Z 1 ∠θ 1 =0.4∠90°, Z 2 ∠θ 2 =0.2∠90°, Z 12 ∠θ 12 =0.5∠90°. When the dynamic reactive power compensation device is not connected, under rated operating conditions, the AC filter and reactive power compensation capacitor of the DC transmission system should exactly compensate the reactive power consumed by the DC transmission system, which is usually regarded as a constant susceptance. In this...

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Abstract

The invention provides a flow-based voltage supporting ability evaluation method of a multi-infeed direct-current receiving-end power grid. The method comprises the following steps: (A) calculating flow of the multi-infeed direct-current receiving-end power grid; (B) constructing a nodal-admittance matrix Y of a receiving-end alternating-current power grid; (C) calculating a nodal-impedance matrix Z, which is an inverse matrix of the nodal-admittance matrix Y; (D) calculating voltage supporting ability evaluation indexes of a to-be-inspected direct-current power transmission system feed node; and (E) evaluating the voltage supporting ability of the to-be-inspected node. According to the flow-based voltage supporting ability evaluation method, the problem of no voltage supporting ability evaluation method suitable for a general multi-infeed direct-current receiving-end power grid at present is solved.

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 multiple DC feed-in and receiving-end power grids based on power flow calculations. Background technique [0002] With the wide application of HVDC transmission technology, multiple DC feed-in and receiving-end power grids have been formed in modern power systems. The DC transmission system consumes a large amount of reactive power during operation, which reduces the voltage stability level of the receiving end grid. In order to enhance the voltage support capability of the receiving end grid, a dynamic reactive power compensation device is usually installed in it. [0003] For multi-DC feed-in and receiving-end power grids, the establishment of an index system that can effectively evaluate the transient voltage support capability and DC power recovery capability of key nodes after a fault is of great sig...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
Inventor 周保荣雷晟管霖洪潮程兰芳姚文峰张东辉黄东启
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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