适用于大规模纯新能源发电基地送出的混合式直流输电系统  

A Hybrid HVDC Topology Suitable for Large-Scale Pure Clean Energy Power Base Transmission

作　　者：徐文哲 张哲任[1] 徐政[1] XU Wenzhe;ZHANG Zheren;XU Zheng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《中国电力》2023年第4期17-27,共11页Electric Power

摘　　要：为满足大规模纯新能源发电基地送出需求,经过拓扑比选,选取在送端采用电网换相换流器(LCC)与模块化多电平换流器(MMC)混合级联拓扑、受端采用二极管-模块化多电平换流器(DMMC)拓扑的混合式直流输电方案。其中,由整流站MMC提供送端交流电压支撑,并与LCC配合作为送出功率平衡中转站。随后,设计系统的基本控制和故障穿越策略,使系统能够稳定送出新能源功率且兼具经济性与故障穿越能力。最后,在PSCAD/EMTDC中搭建±800 kV/5000 MW双极直流输电仿真模型,验证所提控制与故障穿越策略的有效性,结果表明:所选拓扑适用于大规模纯新能源发电基地送出场景。In order to meet the transmission needs of large-scale pure new energy power bases,after topology comparison,this paper used a hybrid cascaded topology consisting of a line commutated converter(LCC)and a modular multilevel converter(MMC)in the sending end and a hybrid high voltage direct current(HVDC)scheme featuring a diode-MMC(D-MMC)topology in the receiving end.Specifically,the rectifier station MMC provides the alternating current(AC)voltage support at the sending end and cooperates with the LCC as a sending power to balance transfer stations.Then the basic control and fault ride-through strategy of the system is designed so that the system can stably send out new energy power and has both economy and fault ride-through capability.Finally,a±800 kV/5000 MW bipolar direct current(DC)transmission simulation model is built in PSCAD/EMTDC to verify the effectiveness of the proposed control and fault ride-through strategy,and the results indicate that the selected topology is suitable for transmission scenarios of large-scale pure new energy power bases.

关 键 词：电网换相换流器 模块化多电平换流器 大功率二极管阀 混合直流输电 纯新能源基地送出 

分 类 号：TM721.1[电气工程—电力系统及自动化]