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Flexible DC configuration method and system for suppressing two-DC simultaneous commutation failure

A flexible direct current, commutation failure technology, applied in the field of power system

Active Publication Date: 2018-12-07
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +3
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Problems solved by technology

[0005] The present invention proposes a flexible DC configuration method and system for suppressing simultaneous commutation failure of two circuits of DC to solve the problem of how to suppress the AC fault area of ​​simultaneous commutation failure of two circuits of DC

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  • Flexible DC configuration method and system for suppressing two-DC simultaneous commutation failure

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Embodiment approach

[0080] In the embodiment of the present invention, the annual mode data of Henan power system research level is read as the research basis. The planned distribution map of Henan 500kV power grid in 2020 is as follows figure 2 Shown.

[0081] Step1: The typical operation mode of the establishment of the system is as follows: North China-Central China power grid is connected through UHV Changzhi-Nanyang-Jingmen single circuit, the normal operating power of UHV Changnan line is 5400MW, and two DCs are fed into Henan by Tianzhong DC and Qinghai-Henan DC Power grid, Tianzhong DC transmission power is 8000MW, receiving end converter station is 500kV Zhongzhou converter station, Qinghai-Henan DC half voltage operation, transmission power is 5000MW, receiving end converter station is 500kV Zhumadian converter station. The Henan Power Grid includes four sub-regions, namely, northern Henan, central Henan, southern Henan and western Henan. 1 ,S 2 ,S 3 }, the transmission section constitutes...

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Abstract

The invention discloses a flexible DC configuration method and system for suppressing two-DC simultaneous commutation failure. The method comprises steps that multiple subareas of the grid and transmission sections among the subareas are determined; fault checking is performed, and a first AC fault area causing two-DC simultaneous commutation failures is determined; a flexible DC configuration candidate line set between two converter stations is determined; electrical distances among high voltage buses of two DC receiving inverter stations are respectively calculated on the condition that flexible DC is mounted in different lines; the electrical distances are arranged in descending order, a line configuration order set of the flexible DC is determined, and lines in the line configuration order set are respectively sequentially selected as the current line; the flexible DC is mounted in the current line, fault checking is further performed, and a second AC fault area is determined; a commutation failure suppression effect index is calculated, the commutation failure suppression effect index is compared with the preset index threshold, and a flexible DC configuration scheme is determined on the basis.

Description

Technical field [0001] The present invention relates to the technical field of electric power systems, and more specifically, to a flexible DC configuration method and system for suppressing the failure of commutation of two DC circuits at the same time. Background technique [0002] my country's resources and load centers are distributed in the opposite direction. Resources are mainly distributed in the western and northern regions, while loads are mainly distributed in the central and eastern regions. In order to optimize the allocation of resources and meet the growing power demand of the central and eastern load centers, it is necessary to transform the energy advantages of the west into electric energy to be sent to the load centers. UHV DC transmission has advantages in long-distance and large-capacity transmission, and it also affects the system. Safe and stable operation brings risks. [0003] UHV DC has the characteristics of large transmission capacity and strong AC-DC c...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/48
CPCH02J3/36H02J3/48Y02E60/60
Inventor 张正卫王璟唐晓骏马世英张晓东谢岩饶宇飞申旭辉郭长辉霍启迪赵华罗红梅方舟张鑫田春筝李晓珺李程昊毛玉斌吉平刘永民李晶司瑞华李媛媛于琳琳陈湘李再华李立新张恺
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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