面向新能源基地全直流送出的混合式特高压直流变压器研究

刘哲; 郭瀚临; 高艺; 邬炜; 张哲任; 徐政

doi:10.12204/j.issn.1000-7229.2026.02.001

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电力建设 ›› 2026, Vol. 47 ›› Issue (2) : 1-13. DOI: 10.12204/j.issn.1000-7229.2026.02.001

电力电子装备在新型电力系统中的应用·栏目主持徐政、余占清、赵成勇、查晓明、向往、马为民、吴方劼·

面向新能源基地全直流送出的混合式特高压直流变压器研究

刘哲 ¹ ,
郭瀚临 ² ,
高艺 ¹ ,
邬炜 ¹ ,
张哲任 ² ,
徐政 ²

作者信息 +

Research on Hybrid Ultra High Voltage DC Transformer for All-DC Transmission of Renewable Energy Bases

LIU Zhe ¹ ,
GUO Hanlin ² ,
GAO Yi ¹ ,
WU Wei ¹ ,
ZHANG Zheren ² ,
XU Zheng ²

Author information +

文章历史 +

摘要

【目的】为降低特高压直流变压器（ultra high voltage DC transformer，UHVDCT）设备的投资成本，推进其在大规模新能源基地送出领域的应用，提出了一种混合式UHVDCT拓扑，并设计了相应的控制策略。【方法】所提拓扑是基于混合换流器的思路，对由模块化多电平换流器（modular multilevel converter，MMC）交流侧面对面连接构成的经典UHVDCT拓扑进行了改进，将其特高压侧由全容量MMC改为大容量电网换相换流器（line commutated converter，LCC）和小容量MMC并联，而高压侧仍由MMC构成。【结果】所提拓扑在运行时可以实现由特高压侧的LCC承担该侧全部的有功功率传输，而特高压侧的MMC运行在V/f控制模式，为UHVDCT内部交流环节提供电压和频率参考，并通过有源滤波控制吸收LCC产生的谐波电流，高压侧的MMC运行在定直流电压控制模式，控制UHVDCT连接的新能源基地内直流电压恒定，并能够调节UHVDCT内部实现动态无功平衡。基于PSCAD/EMTDC的仿真结果表明，所提拓扑在稳态和故障下的性能良好。【结论】所提拓扑充分结合了LCC和MMC各自的优势，显著降低了对成本较高的MMC的容量需求。以额定容量为10 000 MW的UHVDCT为例，厂商报价表明设备总体投资成本相比于经典拓扑可节省约4.36亿元，拓扑的经济性显著提升。

Abstract

[Objective] To reduce the investment cost of the ultra high voltage DC transformer （UHVDCT） and promote its application in the transmission of large-scale renewable energy bases，a hybrid UHVDCT topology is proposed and a corresponding control strategy is designed. [Methods] The proposed topology is based on the concept of hybrid converters，with improvements made to the classic UHVDCT topology formed by face-to-face connections of the AC side of modular multilevel converters （MMCs）. The ultra high voltage side is modified from full-capacity MMCs to a parallel configuration of high-capacity line commutated converters （LCCs） and low-capacity MMCs，while the high voltage side remains composed of MMCs. [Results] In operations of the proposed topology，LCCs on the ultra high voltage side can undertake all active power transmission on this side，while MMCs on the ultra high voltage side operate in V/f control mode，providing voltage and frequency references for the AC links in the UHVDCT，and absorbing the harmonic currents generated by LCC through active power filter control. MMCs on the high voltage side operate in constant DC voltage control mode，maintaining the DC voltage within the renewable energy base connected to the UHVDCT. They can also enable the dynamic reactive power balance within the UHVDCT. The results of simulation based on PSCAD/EMTDC show that the proposed topology demonstrates a good performance in both steady-state and failure conditions. [Conclusions] The proposed topology fully combines the advantages of LCC and MMC，significantly reducing the capacity requirements for the expensive MMC. Taking a UHVDCT with a rated capacity of 10，000 MW as an example，the manufacturer’s quotation shows that the total investment cost can be reduced by approximately RMB 436 million compared to the classic topology，indicating a significant improvement in the economic efficiency.

导出引用

刘哲, 郭瀚临, 高艺, 等. 面向新能源基地全直流送出的混合式特高压直流变压器研究[J]. 电力建设. 2026, 47(2): 1-13 https://doi.org/10.12204/j.issn.1000-7229.2026.02.001

LIU Zhe, GUO Hanlin, GAO Yi, et al. Research on Hybrid Ultra High Voltage DC Transformer for All-DC Transmission of Renewable Energy Bases[J]. Electric Power Construction. 2026, 47(2): 1-13 https://doi.org/10.12204/j.issn.1000-7229.2026.02.001

中图分类号： TM721.1

参考文献

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