Method for evaluating bearing capacity of main grid frame of multi-direct-current feed-in receiving end power grid

Abstract

The invention provides a multi-direct-current feed-in receiving end power grid main grid frame bearing capacity evaluation method, which comprises the following steps of: firstly, constructing a main grid frame bearing capacity evaluation index system, and collecting basic information of a power grid; secondly, performing load flow calculation under the stable operation condition of the power grid to obtain a power grid strength evaluation index; then, setting an alternating-current line fault mode, and performing stability simulation under a power grid anticipated fault set to obtain a power grid anti-interference capability evaluation index; the power grid is simulated after the AC line fault is removed, and a power grid elasticity evaluation index is obtained; and finally, evaluating the bearing capacity of the main net rack by using the power grid strength evaluation index, the power grid anti-interference capability evaluation index and the power grid elasticity evaluation index respectively. According to the method, the bearing capacity evaluation index system of the receiving-end power grid main grid frame is constructed by considering the possible operation state of the power grid, the large-scale direct current feed-in bearing capacity of the receiving-end power grid main grid frame is comprehensively evaluated, and a reference basis is provided for power grid planning and decision makers to improve the receiving-end power grid main grid frame.

Description

technical field [0001] The invention relates to the technical field of electric power system security, in particular to a method for evaluating the carrying capacity of a main network frame of a receiving-end power grid with multiple direct current feeds. Background technique [0002] At present, my country's East China Power Grid, Central China Power Grid and Guangdong Power Grid have formed a multi-DC feed-in pattern. East China Power Grid, as the receiving end grid with the most UHV DC transmission feeds in the world, already has Zhundong-South Anhui, Ximeng-Taizhou, Yanhuai, Xiangjiaba-Shanghai Lingzhou-Shaoxing, Xiluodu-Zhejiang, Jinsu DC Common 7 circuits of large-capacity UHV DC, with a maximum DC feed-in power of 57.7 million kilowatts; according to relevant plans, Central China will feed into Tianzhong, Qishao, Qinghai-Henan, Northern Shaanxi-Hubei, Yazhong-Jiangxi, etc. 5 A large-capacity UHV DC and Yu-E flexible back-to-back DC, with a DC power capacity of more t...

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Problems solved by technology

At present, the receiving-end power grid has encountered practical problems that affect the further improvement of the carrying capacity of the main grid, such as: DC intensive feed-in leads to insufficient static voltage support capacity of the power grid, system frequency stability decreases after a sharp drop in mechanical inertia, and transient dynamic stability of the power grid problems, deterioration of voltage stability characteristics caused by DC continuous commutation failure, power flow evacuation and safety issues near the DC landing point, etc.

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