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<p>Power transfer from offshore DFIG-based wind farms to the onshore grid via HVDC links faces significant operational challenges, especially under grid voltage disturbances. Conventional voltage source converter (VSC)-based inverter station exhibits limitations in mitigating harmonic distortion and power pulsations under such conditions. This paper proposes a novel reinforced current control (RCC) technique at the VSC station, enabling independent regulation of active and reactive power through reinforced current injection. The offshore substation operates under variable voltage and frequency conditions, supporting stable wind turbine operation and enabling adaptive frequency regulation. Additionally, the reactive power demand of the line-commutated converter (LCC) station is compensated through coordinated support from the DFIG wind farm and STATCOM, ensuring improved voltage stability. The proposed framework suppresses 100&#xa0;Hz power oscillations and significantly reduces total harmonic distortion (THD) in grid currents under disturbed conditions. The system is validated through PSCAD/EMTDC simulations and real-time HIL implementation on an OPAL-RT platform for a 100&#xa0;kV, 100&#xa0;km HVDC link connected to a 100&#xa0;MW offshore wind farm. The RCC limits active power oscillations below 3% and maintains grid current THD within 2%, demonstrating improved power quality and robust performance in compliance with IEEE grid standards.</p>

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Mitigating Voltage Fluctuations in Offshore Auxiliary Grid Using Frequency-Controlled DFIG Wind Farm Integrated with HVDC Link

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Rashmi Ranjan Patra,
  • M. A. Asha Rani

摘要

Power transfer from offshore DFIG-based wind farms to the onshore grid via HVDC links faces significant operational challenges, especially under grid voltage disturbances. Conventional voltage source converter (VSC)-based inverter station exhibits limitations in mitigating harmonic distortion and power pulsations under such conditions. This paper proposes a novel reinforced current control (RCC) technique at the VSC station, enabling independent regulation of active and reactive power through reinforced current injection. The offshore substation operates under variable voltage and frequency conditions, supporting stable wind turbine operation and enabling adaptive frequency regulation. Additionally, the reactive power demand of the line-commutated converter (LCC) station is compensated through coordinated support from the DFIG wind farm and STATCOM, ensuring improved voltage stability. The proposed framework suppresses 100 Hz power oscillations and significantly reduces total harmonic distortion (THD) in grid currents under disturbed conditions. The system is validated through PSCAD/EMTDC simulations and real-time HIL implementation on an OPAL-RT platform for a 100 kV, 100 km HVDC link connected to a 100 MW offshore wind farm. The RCC limits active power oscillations below 3% and maintains grid current THD within 2%, demonstrating improved power quality and robust performance in compliance with IEEE grid standards.