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With the dual-carbon goal promotion, new energy UHVDC transmission is key for energy transition, but AC/DC fault-induced voltage instability threatens system security. This paper focuses on voltage stability in new energy UHVDC links, analyzing key factors and proposing collaborative controls. A refined new energy station model and Dynamic Generalized Short Circuit Ratio quantify nonlinear effects of new energy variability and weak grids on inertia/short-circuit capacity, cutting misjudgment rate by 32.5% versus traditional methods. For VSC-HVDC converter stations, a hierarchical decoupling control with transient energy balance suppresses fault voltage fluctuations. Simulations show improved control limits dips to 0.09 p.u., recovers in 200 ms, and optimizes performance by 60% over traditional PI control. Multi-time-scale dynamic interaction mechanisms are revealed, with capacitor current feedforward and damping filtering suppressing power oscillations by 60%. A 2.5 GW Northwest China case validates strategies at 70% penetration, offering theoretical and engineering insights for secure new energy grid operation.

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Investigation of Influencing Factors and Control Strategies for Voltage Stability of New Energy DC Transmission Links Under AC/DC Faults

  • 会议论文

  • 发表日期：

    2026年

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  • Zhenjun Gao,
  • Xin Yang,
  • Yunlong Chu,
  • Xiuting Rong,
  • Zongwu Huang,
  • Zixi Han,
  • Jirong Fu,
  • Youping Fan

摘要

With the dual-carbon goal promotion, new energy UHVDC transmission is key for energy transition, but AC/DC fault-induced voltage instability threatens system security. This paper focuses on voltage stability in new energy UHVDC links, analyzing key factors and proposing collaborative controls. A refined new energy station model and Dynamic Generalized Short Circuit Ratio quantify nonlinear effects of new energy variability and weak grids on inertia/short-circuit capacity, cutting misjudgment rate by 32.5% versus traditional methods. For VSC-HVDC converter stations, a hierarchical decoupling control with transient energy balance suppresses fault voltage fluctuations. Simulations show improved control limits dips to 0.09 p.u., recovers in 200 ms, and optimizes performance by 60% over traditional PI control. Multi-time-scale dynamic interaction mechanisms are revealed, with capacitor current feedforward and damping filtering suppressing power oscillations by 60%. A 2.5 GW Northwest China case validates strategies at 70% penetration, offering theoretical and engineering insights for secure new energy grid operation.