适用于孤岛风电外送的LCC-DR混合型直流输电系统OA北大核心CSTPCD
A LCC-DR Hybrid HVDC System Topology Suitable for Island Wind-Power Transmission
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.
李明;赵峥;孟沛彧;李探;向往;文劲宇
国网经济技术研究院有限公司,北京市 102209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
动力与电气工程
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
island wind powerhybrid HVDC transmission systemdiode rectifier unitgrid forming controlAC/DC fault ride-through
《电力建设》 2024 (004)
46-56 / 11
This work is supported by State Grid Corporation of China Research Program(No.5100-202156581A-0-5-SF).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)
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