Novel string scheme and power decoupling control technology for large-capacity DC wind turbines

LIU Qihui; LIU Yixin; LIANG Zhongyu; HONG Chengcheng; CAI Xipeng; ZHU Yihua

doi:10.15938/j.emc.2024.12.003

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Novel string scheme and power decoupling control technology for large-capacity DC wind turbines

更新时间：2025-06-03

- Novel string scheme and power decoupling control technology for large-capacity DC wind turbines
- Electric Machines and Control Vol. 28, Issue 12, Pages: 20-32(2024)
- 作者机构：
  
  华北电力大学新能源电力系统国家重点实验室，北京 102206
  南方电网科学研究院有限责任公司直流输电技术全国重点实验室，广东广州 510663
  国家能源大电网技术研发（实验）中心，广东广州 510663
  广东省新能源电力系统智能运行与控制企业重点实验室，广东广州 510663
- 作者简介：
- 基金信息：
- DOI：10.15938/j.emc.2024.12.003
  CLC： TM732
- Received：12 August 2024，
  
  Published：2024-12
- 稿件说明：
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LIU Qihui, LIU Yixin, LIANG Zhongyu, et al. Novel string scheme and power decoupling control technology for large-capacity DC wind turbines[J]. Electric Machines and Control, 2024, 28(12): 20-32.
DOI：

LIU Qihui, LIU Yixin, LIANG Zhongyu, et al. Novel string scheme and power decoupling control technology for large-capacity DC wind turbines[J]. Electric Machines and Control, 2024, 28(12): 20-32. DOI： 10.15938/j.emc.2024.12.003.

摘要

针对全直流海上串并联型风电场存在的弃风现象和可靠性低的问题，在传统串并联型风电场的基础上提出一种由直流风机、三电平半桥功率解耦电路和隔离型DC/DC变换器组成的新型串并联风电场架构及其控制策略。根据风机高容量和高电压的需求，提出三电平半桥功率解耦电路和模块化隔离型DC/DC变换器方案，分析了功率解耦电路的工作原理，同时考虑风机输出电压平衡和功率解耦电路输出电压稳定目标，给出了功率解耦电路和模块化DC/DC变换器的控制策略，最后通过离线仿真和硬件在环实验验证了功率解耦电路和DC/DC变换器拓扑及其控制策略的有效性。该方案优化了串并联型风电场汇集拓扑，解决了串联风机功率耦合的问题，实现了串联风机在不同风速下仍能进行最大风能追踪控制的目标，提高了串并联型风电场的可靠性。

Abstract

In response to the issues of wind curtailment and low reliability in all-DC offshore wind farms with series-parallel connections

a new type of series-parallel wind farm and its control strategy was proposed based on traditional series-parallel wind farms. This new system consists of direct-drive wind turbines

three-level half-bridge power decoupling circuits

and isolated DC/DC converters. According to the requirements of high capacity and high voltage of the wind turbine

a three-level half-bridge power decoupling circuit and a modular isolated DC/DC converter scheme were proposed. The working principle of the power decoupling circuit was analyzed. Considering the output voltage balance of the wind turbine and the output voltage stability goal of the power decoupling circuit

the control strategies of the power decoupling circuit and the modular DC/DC converter were given. Finally

effectiveness of the power decoupling circuit and the DC/DC converter topology and their control strategies were verified by offline simulation and hardware-in-the-loop experiments. The scheme optimizes the series-parallel connection topology of the wind farm

solves the problem of power coupling between series-connected wind turbines

and achieves the goal of maximum wind energy tracking control for series-connected wind turbines under different wind speeds

thereby enhancing the reliability of the series-parallel wind farm.

关键词

Keywords

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