适用于孤岛风电外送的LCC-DR混合型直流输电系统  

A LCC-DR Hybrid HVDC System Topology Suitable for Island Wind-Power Transmission

作　　者：李明 赵峥 孟沛彧 李探 向往[2] 文劲宇[2] LI Ming;ZHAO Zheng;MENG Peiyu;LI Tan;XIANG Wang;WEN Jinyu(State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;State Key Laboratory of Advanced Electromagnetic Technology(Huazhong University of Science and Technology),Wuhan 430074,China)

机构地区：[1]国网经济技术研究院有限公司,北京市102209 [2]强电磁技术全国重点实验室(华中科技大学电气与电子工程学院),武汉市430074

出　　处：《电力建设》2024年第4期46-56,共11页Electric Power Construction

基　　金：国家电网公司科技项目“混合级联直流系统设计可靠性提升技术研究”(5100-202156581A-0-5-SF)。

摘　　要：为实现沙漠、戈壁、荒漠地区孤岛风电的大规模汇集与远距离输送,提出了一种兼顾直流故障穿越与经济性的基于电网换相换流器-二极管整流器(line commutated converter-diode rectifier,LCC-DR)的混合型输电系统。文章首先介绍了混合型输电系统的拓扑结构,该系统送端采用电网换相换流器(line commutated converter,LCC)与二极管整流器(diode rectifier,DR)串联,从而接入大规模风电基地。随后建立了系统数学模型,并设计了协调控制方案。针对直流故障与交流故障,分析了故障期间系统的运行情况并为系统设计了故障穿越策略,保障系统的稳定运行。为验证控制策略的有效性,在PSCAD/EMTDC中建立了LCC-DR混合型输电系统模型并开展稳态与暂态运行特性仿真。研究结果表明,该系统可有效实现沙戈荒地区新能源的大规模远距离输送。An LCC-DR hybrid HVDC transmission system that considers DC fault ride-through and economy is proposed herein to achieve large-scale centralized and long-distance transmission of island wind power in the Gobi Desert.First,the topology of the hybrid transmission system is introduced.The system uses LCC and DR in series to integrate a large-scale wind power base.Subsequently,a mathematical model of the system is established,and a control scheme is designed based on it.Under DC and AC faults,the operation of the system is analyzed,and a fault ride-through strategy is designed to ensure the stable operation of the system.To verify the effectiveness of the control strategy,an LCC-DR hybrid transmission system model is established in PSCAD/EMTDC,and the steady-state and transient operation characteristics are simulated.The results show that the system can effectively realize the large-scale and long-distance transmission of renewable energy in the Gobi Desert.This work is supported by State Grid Corporation of China Research Program(No.5100-202156581A-0-5-SF).

关 键 词：孤岛风电 混合直流输电系统 二极管整流单元 构网控制 交直流故障穿越 

分 类 号：TM76[电气工程—电力系统及自动化]