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哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市 150001
Received:12 May 2022,
Revised:2022-07-20,
Published Online:27 September 2022,
Published:25 November 2022
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李彬彬,王宁,赵晓东等.适用于全直流海上风电场的柔性换流高压大容量直流变压器[J].电力系统自动化,2022,46(22):129-141.
LI Binbin,WANG Ning,ZHAO Xiaodong,et al.High-voltage Large-capacity DC Transformer Based on Flexible Commutation for Full-DC Offshore Wind Farm[J].Automation of Electric Power Systems,2022,46(22):129-141.
李彬彬,王宁,赵晓东等.适用于全直流海上风电场的柔性换流高压大容量直流变压器[J].电力系统自动化,2022,46(22):129-141. DOI: 10.7500/AEPS20220512002.
LI Binbin,WANG Ning,ZHAO Xiaodong,et al.High-voltage Large-capacity DC Transformer Based on Flexible Commutation for Full-DC Offshore Wind Farm[J].Automation of Electric Power Systems,2022,46(22):129-141. DOI: 10.7500/AEPS20220512002.
全直流海上风电场是支撑海上风电向大型化、深远海化发展的前沿技术,有望提高风电汇集与送出效率,减小海上平台体积。百千伏/百兆瓦级直流变压器是全直流海上风电场亟待突破的技术瓶颈。文中提出了一种柔性换流高压大容量直流变压器拓扑,探索了基于有源桥臂与晶闸管阀组、二极管阀组相配合的新型换流方式,结合了晶闸管、二极管阀组导通损耗低、功率密度高、串联技术成熟的优势与有源桥臂电压、电流波形高度可控的特点,从而实现高效率柔性换流、高可控功率变换,且输入、输出直流电流平滑,无须安装滤波器。文中详细介绍了所提拓扑的电路结构、工作原理以及控制策略,并通过±35 kV/±400 kV、300 MW仿真模型和小功率实验样机进行了验证。最后,与现有柔性直流输电模块化多电平换流器海上平台进行对比分析,说明了所提直流变压器拓扑的技术经济性。
The full-DC offshore wind farm is an advanced technology promoting the development of large-scale and far-reaching offshore wind farms. It is expected to improve the efficiency of wind power collection and transmission
and reduce the volume of the offshore platform. However
the DC transformer with the capability of hundreds of kilovolts and megawatts is the technical bottleneck of the full-DC offshore wind farm. This paper proposes a topology of the high-voltage large-capacity DC transformer based on flexible commutation
and explores a new commutation mode based on the combination of active bridge arms
thyristors and diode valves. It combines the advantages of thyristors and diode valves with low conduction loss
high power density
technological matureness in series
and the highly controllable voltage and current waveforms of the active arm. Therefore
high-efficiency flexible commutation and high controllable power conversion can be realized. Moreover
the input and output currents are smooth
thus there is no need to install filters. The structure
working principle
and control strategy of the topology are introduced in detail
and it has been demonstrated by a simulation model of ±35 kV/±400 kV and 300 MW and a low-power experimental prototype. Finally
compared with the existing modular multilevel converter offshore platform in the flexible DC transmission
the technological economy of the proposed DC transformer topology is illustrated.
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