Operating principle of Soft Open Points for electrical distribution network operation

被引:200
作者
Cao, Wanyu [1 ]
Wu, Jianzhong [1 ]
Jenkins, Nick [1 ]
Wang, Chengshan [2 ]
Green, Timothy [3 ]
机构
[1] Cardiff Univ, Sch Engn, Inst Energy, Cardiff CF24 3AA, S Glam, Wales
[2] Tianjin Univ, Minist Educ, Key Lab Smart Grid, Tianjin 300072, Peoples R China
[3] Univ London Imperial Coll Sci Technol & Med, Dept Elect & Elect Engn, London, England
基金
英国工程与自然科学研究理事会;
关键词
Soft Open Point; Back-to-back converter; Distribution network; Network operation; SYSTEM; VSC; IMPLEMENTATION; GRIDS; MODEL; LOOP; PV;
D O I
10.1016/j.apenergy.2015.12.005
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
080707 [能源环境工程]; 082001 [油气井工程];
摘要
Soft Open Points (SOPS) are power electronic devices installed in place of normally-open points in electrical power distribution networks. They are able to provide active power flow control, reactive power compensation and voltage regulation under normal network operating conditions, as well as fast fault isolation and supply restoration under abnormal conditions. Two control modes were developed for the operation of an SOP, using back-to-back voltage-source converters (VSCs). A power flow control mode with current control provides independent control of real and reactive power. A supply restoration mode with a voltage controller enables power supply to isolated loads due to network faults. The operating principle of the back-to-back VSCs based SOP was investigated under both normal and abnormal network operating conditions. Studies on a two-feeder medium-voltage distribution network showed the performance of the SOP under different network-operating conditions: normal, during a fault and post-fault supply restoration. During the change of network operating conditions, a mode switch method based on the phase locked loop controller was used to achieve the transitions between the two control modes. Hard transitions by a direct mode switching were noticed unfavourable, but seamless transitions were obtained by deploying a soft cold load pickup and voltage synchronization process. (C) 2015 The Authors. Published by Elsevier Ltd.
引用
收藏
页码:245 / 257
页数:13
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