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

doi:10.11930/j.issn.1004-9649.202205044

摘要/Abstract

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（D-MMC）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。

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

Abstract: 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.

Key words: line commutated converter, modular multilevel converter, high power diode valve, hybrid HVDC, clean energy power base transmission

徐文哲, 张哲任, 徐政. 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[J]. 中国电力, 2023, 56(4): 17-27.

XU Wenzhe, ZHANG Zheren, XU Zheng. A Hybrid HVDC Topology Suitable for Large-Scale Pure Clean Energy Power Base Transmission[J]. Electric Power, 2023, 56(4): 17-27.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202205044

https://www.electricpower.com.cn/CN/Y2023/V56/I4/17

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