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Control Strategy for Offshore Wind Farms with DC Collection System Based on Series-Connected Diode Rectifier

Author

Listed:
  • Lijun Xie

    (China Electric Power Research Institute, Beijing 100192, China)

  • Fan Cheng

    (Center for Strategic Studies, China Academy of Engineering, No 2 Bingjiaokou Hutong, Beijing 100088, China)

  • Jing Wu

    (China Electric Power Planning & Engineering Institute, No 65 Ande Road, Beijing 100120, China)

Abstract

The DR-HVDC (Diode rectifier-based HVDC) transmission topology was recently proposed for integration on large offshore wind farms due to its low investment cost and high reliability. To further reduce the investment, a DC collection topology based on the series-connected diode rectifiers (DR) is proposed, where no offshore platform is needed. However, units of series-connected topology (SCU) show coupling issues, such as overvoltage, energy curtailment, and fault isolation. First, the coupling mechanism is analyzed, and a suitable operation mode for SCUs is selected to ensure the safe operation of the DC system. Then, the linear relationship of active power and output DC current and DC voltage of SCUs is analyzed, and a novel coordinate control strategy for DC wind farms is proposed, where an onshore converter adapts a DC current controller and wind turbines adapt a mediate output voltage control strategy. The mediate output voltage control strategy includes a triple loop with power loop, mediate output voltage loop, and current loop. Also, the DC open line fault, DC grounding fault, and AC grounding fault of the onshore grid are investigated, and a protection strategy is proposed. A 160 MW wind farm with a DR-SCU DC collection system is built in PSCAD/EMTDC to verify the validity of the proposed control strategy under unequal wind speeds, DC fault, and onshore AC fault, and the results validate the performance of the proposed strategy.

Suggested Citation

  • Lijun Xie & Fan Cheng & Jing Wu, 2022. "Control Strategy for Offshore Wind Farms with DC Collection System Based on Series-Connected Diode Rectifier," Sustainability, MDPI, vol. 14(13), pages 1-15, June.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:13:p:7860-:d:849468
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    References listed on IDEAS

    as
    1. Md Ismail Hossain & Mohammad A. Abido, 2020. "SCIG Based Wind Energy Integrated Multiterminal MMC-HVDC Transmission Network," Sustainability, MDPI, vol. 12(9), pages 1-27, April.
    2. Shangen Tian & David Campos-Gaona & Vinícius A. Lacerda & Raymundo E. Torres-Olguin & Olimpo Anaya-Lara, 2020. "Novel Control Approach for a Hybrid Grid-Forming HVDC Offshore Transmission System," Energies, MDPI, vol. 13(7), pages 1-14, April.
    3. Ryo Miyara & Akito Nakadomari & Hidehito Matayoshi & Hiroshi Takahashi & Ashraf M. Hemeida & Tomonobu Senjyu, 2020. "A Resonant Hybrid DC Circuit Breaker for Multi-Terminal HVDC Systems," Sustainability, MDPI, vol. 12(18), pages 1-14, September.
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    Cited by:

    1. Ran Tao & Jingpeng Yue & Zhenlin Huang & Ranran An & Zou Li & Junfeng Liu, 2022. "A High-Gain DC Side Converter with a Ripple-Free Input Current for Offshore Wind Energy Systems," Sustainability, MDPI, vol. 14(18), pages 1-16, September.

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