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This chapter introduces an adaptive dual droop control (ADDC) method, which delivers rapid frequency support to a disturbed onshore grid from both undisturbed onshore systems and VSC-MTDC (voltage source converter-based multi-terminal direct current) integrated offshore wind farms (OWFs). With standard droop control at onshore converters, any frequency disturbances cause changes in DC voltage and power flow, leading to frequency fluctuations in unaffected systems. The ADDC approach initially identifies disturbed and undisturbed systems, prompting the latter to supply additional frequency support while maintaining safety by setting support power limits and adjusting droop coefficients. Furthermore, offshore stations use onshore DC voltage as a control signal for swift frequency support. Subsequently, OWFs will recover rotor speed through an asymptotic control method to mitigate the secondary frequency drop. Case studies on 3-terminal and 5-terminal test benchmarks, utilizing the Opal-RT real-time simulation platform, compare various control methods, accounting for parameter uncertainties and noise disturbances, showcasing the ADDC scheme’s efficiency and effectiveness.

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Adaptive Dual Droop Control of MTDC Integrated Offshore Wind Farms for Fast Frequency Support

  • 章节

  • 发表日期：

    2025年

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  • Wei Yao,
  • Hongyu Zhou,
  • Yongxin Xiong,
  • Jinyu Wen

摘要

This chapter introduces an adaptive dual droop control (ADDC) method, which delivers rapid frequency support to a disturbed onshore grid from both undisturbed onshore systems and VSC-MTDC (voltage source converter-based multi-terminal direct current) integrated offshore wind farms (OWFs). With standard droop control at onshore converters, any frequency disturbances cause changes in DC voltage and power flow, leading to frequency fluctuations in unaffected systems. The ADDC approach initially identifies disturbed and undisturbed systems, prompting the latter to supply additional frequency support while maintaining safety by setting support power limits and adjusting droop coefficients. Furthermore, offshore stations use onshore DC voltage as a control signal for swift frequency support. Subsequently, OWFs will recover rotor speed through an asymptotic control method to mitigate the secondary frequency drop. Case studies on 3-terminal and 5-terminal test benchmarks, utilizing the Opal-RT real-time simulation platform, compare various control methods, accounting for parameter uncertainties and noise disturbances, showcasing the ADDC scheme’s efficiency and effectiveness.