Coordinated Control Strategy of Sending-End Converters for Wind-Integrated Real Bipolar MMC-HVDC Systems

LI Botong; LIN Mengyuan; ZHENG Guanghui; DONG Yuejin; LIU Yichao

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Coordinated Control Strategy of Sending-End Converters for Wind-Integrated Real Bipolar MMC-HVDC Systems

LI Botong^1,2,3, LIN Mengyuan^1,2,3, ZHENG Guanghui^1,2,3, DONG Yuejin^1,2,3, LIU Yichao⁴

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Abstract

[Objective] Modular multilevel converter based high voltage direct current technology (MMC-HVDC) with real bipolar connection is one of the mainstream technical solutions for efficient grid connection and cross-regional consumption of large-scale islanded wind farms. It has been widely adopted in HVDC projects such as Zhangbei and Rudong in Jiangsu. However, the control strategy for the sending-end positive and negative pole converters faces the dual challenge of balancing bipolar transmission power and providing stable voltage support for the wind farm. To address this, a grid-forming coordination control strategy based on active power-frequency boost / reactive power-voltage droop control for bipolar converters is proposed. [Methods] The relationship between the active power received by the sending-end bipolar converters and the phase and frequency is analyzed. An active power-frequency boost control strategy is established, clarifying the power balance and frequency coordination of bipolar converter under wind power fluctuation and the adaptive regulation mechanism under capacity-limited conditions. The coupling relationship between the voltage and reactive power of the sending end converters and wind farm is revealed. A reactive power-voltage droop control strategy with capacity and active power constraints is established. The coordinated stability mechanism of AC bus voltage under reactive power fluctuation is investigated. [Results] Simulation results demonstrate that the proposed strategy can effectively maintain dynamic power balance between the bipolar converters and provide stable voltage and frequency support for the AC system under various conditions, including system power fluctuations and single-pole capacity limitations. [Conclusions] The coordinated control strategy proposed can effectively deal with the core challenges of power balance and voltage and frequency support for the wind farm under complex working conditions, and improve the operation stability of the system.

Key words

islanded wind farm / MMC-HVDC / sending-end bipolar converters / active power-frequency rise control / reactive power-voltage droop control / coordinated control strategy

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LI Botong, LIN Mengyuan, ZHENG Guanghui, DONG Yuejin, LIU Yichao. Coordinated Control Strategy of Sending-End Converters for Wind-Integrated Real Bipolar MMC-HVDC Systems[J]. Electric Power Construction. 0

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