Coordinated Control of Commutation Failure Prevention for UHVDC Hierarchical Connection to AC Grid

被引：0

作者：

Xin J. ^{[1
]}

Shu Z. ^{[1
]}

Tan Y. ^{[2
]}

Wang G. ^{[1
]}

Yao W. ^{[2
]}

Ai X. ^{[2
]}

Wen J. ^{[2
]}

Cheng S. ^{[1
]}

机构：

[1] Electric Power Research Institute of State Grid Jiangxi Electric Power Company, Nanchang, 330096, Jiangxi Province

[2] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, 430074, Hubei Province

来源：

Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 10期

关键词：

CFPREV; Commutation failure; Coordinated control; Hierarchical connection; UHVDC;

D O I：

10.13335/j.1000-3673.pst.2018.2022

中图分类号：

学科分类号：

摘要：

The inverter valves of an ultra-high voltage direct current (UHVDC) system are integrated to 500kV and 1000kV voltage levels respectively under hierarchical connection mode. Hence, after AC fault occurs in one of the two voltage levels, the dominant factors inducing commutation failures (CFs) in those two sets of inverter valves may be different from each other. This paper analyzes the dominant factors of CFs in those two sets of inverter valves. The dominant factor inducing CFs of inverter valves connecting to fault voltage level is AC voltage drop, but the dominant factor inducing CFs of inverter valves connecting to non-fault voltage level is DC current increase. Since the commutation failure prevention (CFPREV) detects AC faults by AC voltage, the CFPREV of non-fault inverter valves acts so late that it has a low probability of preventing CFs. To address this problem, a coordinated control scheme of CFPREVs is proposed to advance the acting time of the later acting CFPREV by making the CFPREVs act simultaneously. The coordinated control scheme can effectively prevent CFs of the inverters connecting to the non-fault voltage level. A simulation model based on a planning hierarchical connection project is built in PSCAD/EMTDC. Simulation studies validate effectiveness of the proposed control scheme. © 2019, Power System Technology Press. All right reserved.

引用

页码：3543 / 3551

页数：8

共 23 条

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