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Assessment method and system for voltage supporting capability of multi-DC-feed AC power grid

A multi-DC feed-in and voltage support technology, applied in the field of power systems, can solve problems such as no evaluation threshold and weak adaptability

Active Publication Date: 2015-01-28
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

It aims to solve the problems of weak adaptability and no recognized evaluation threshold in the evaluation method of the voltage support capability of the multi-DC infeed and receiving-end AC system in the prior art

Method used

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  • Assessment method and system for voltage supporting capability of multi-DC-feed AC power grid

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Embodiment Construction

[0048] The present invention provides a method and system for assessing the voltage support capability of an AC grid with multiple DC feeds. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049] see figure 1 , which is a flowchart of an evaluation method for the voltage support capability of an AC power grid with multiple DC feeds. As shown in the figure, the method includes the following steps in sequence:

[0050] S1. Establish a time-domain simulation model of an actual AC power grid with multiple DC feed-in, wherein the DC rectifier side adopts a constant current control method;

[0051] S2. According to the transfer impedance between the commutation buses of each DC inverter station, calculate th...

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Abstract

The invention discloses an assessment method and system for the voltage supporting capability of a multi-DC-feed AC power grid, and the method enables the voltage supporting capability of the multi-DC-feed AC power grid to be reflected by the capability of simultaneous increase of active power of an AC system for supporting a multi-DC power transmission line. Through the setting of an incidence matrix for the increase of a current constant value of the multi-DC power transmission line, the margin between the maximum value of the increase of DC power and a rated value is calculated, thereby forming quantitative indexes for the assessment of the voltage supporting capability of the multi-DC-feed AC power grid. The method and system are clear in physical concepts, is high in adaptability, and is good in prospects of popularization and application.

Description

technical field [0001] The present invention relates to the field of power systems, in particular to a method and system for evaluating the voltage support capability of an AC grid with multiple DC feeds. Background technique [0002] Affected by factors such as the continuous increase in the level of load power consumption and the connection of large-capacity UHV DC, the electrical problems of the power grid have become increasingly prominent and have become an important threat to the safe and stable operation of the Internet. For example, the cross-regional transmission network with a voltage level of 500kV and above has formed a pattern of AC and DC hybrid transmission. The DC landing point in the main load center area is increasing continuously, and the electrical distance of each inverter station is relatively close. The power transmission capacity of multiple DC centralized feed-in is huge. In this kind of multi-DC feeding AC grid, the strong coupling and strong nonl...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F19/00
CPCG16Z99/00H02J3/00H02J2203/20
Inventor 周保荣雷晟管霖金小明李鸿鑫张东辉
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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