Flexible control strategy for HVDC transmission system adapted to intermittent new energy delivery  

作　　者：Chenhao Li Kuan Li Changhui Ma Pengfei Zhang Qi Tao Yingtao Sun Xin Wang 

机构地区：[1]State Grid Shandong Electric Power Research Institute,Jinan,P.R.China [2]State Grid International Development Limited,Beijing,P.R.China [3]State Grid Jinan Power Supply Company,Jinan,P.R.China [4]Independent Power Transmission Operator S.A.,89 Dyrrachiou Str.&Kifisou 10443,Athens,Greece

出　　处：《Global Energy Interconnection》2021年第4期425-433,共9页全球能源互联网（英文版）

基　　金：an independent research project from the Shandong Electric Power Research Institute,“Research on the control method of DC power under fixed converter transformer tap-changer position”(ZY-2020-01);Based on the achievement,a national invention patent(No.2020112240143)has been applied.

摘　　要：Intermittent new energy delivery requires increasing the flexibility of ultra-high voltage direct current(DC)power adjustment.Based on a converter steady-state model and a DC power model,the control angle constraints of a converter valve are relaxed for power regulation.In this paper,a flexible DC power control method based on a fixed tap changer position is proposed.The initial ratio of the converter transformer is optimized.The effects of the fixed-tap changer position control on the control angle,reactive power compensation,and commutation failure are analyzed.The new control method allows a DC system to operate at a large angle and increase the additional reactive power loss while improving the commutation security margin.Steady-state and electromagnetic transient simulations in the CIGRE test system verify the validity of the method proposed in this paper and the correctness of the analysis conclusions.

关 键 词：Tap changer DC power Firing angle Reactive power compensation Extinction angle Commutation failure 

分 类 号：TM721.1[电气工程—电力系统及自动化]