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<p>When grid causes transient fault, system performance will deteriorate. During LVRT period, grid-connected inverters will be affected by negative sequence components, second harmonic components, voltage drop, and over-current. To ensure system stable operation under power grid failure, this paper proposes based on virtual current +VPI PV GFL VSG LVRT control strategy. Virtual current control is introduced to eliminate over-current and current imbalance during faults, while introducing active power compensation to suppress active power reduction and meet load demand. To realize power stability control, a VPI resonant controller is introduced to suppress power doubling fluctuations. Parameter design rules and control performance of VPI resonant regulator are, respectively, analyzed. An experimental platform for PV GFL VSG power–current coordinated LVRT control strategy is established for experimental verification. Test results show GFL VSG power–current coordinated LVRT control strategy can not only suppress fault surge current and voltage drop during voltage sag faults, but also suppress the influence of negative sequence components and power doubling fluctuations, compared with conventional GFL VSG/GFL VSG positive and negative sequence separation LVRT control strategy, further improving system's LVRT capability. Finally, the feasibility of this method is further validated by applying it to photovoltaic energy storage micro-grid.</p>

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LVRT control strategy of PV GFL VSG grid-connected converter

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Zuobin Zhu,
  • Shumin Sun

摘要

When grid causes transient fault, system performance will deteriorate. During LVRT period, grid-connected inverters will be affected by negative sequence components, second harmonic components, voltage drop, and over-current. To ensure system stable operation under power grid failure, this paper proposes based on virtual current +VPI PV GFL VSG LVRT control strategy. Virtual current control is introduced to eliminate over-current and current imbalance during faults, while introducing active power compensation to suppress active power reduction and meet load demand. To realize power stability control, a VPI resonant controller is introduced to suppress power doubling fluctuations. Parameter design rules and control performance of VPI resonant regulator are, respectively, analyzed. An experimental platform for PV GFL VSG power–current coordinated LVRT control strategy is established for experimental verification. Test results show GFL VSG power–current coordinated LVRT control strategy can not only suppress fault surge current and voltage drop during voltage sag faults, but also suppress the influence of negative sequence components and power doubling fluctuations, compared with conventional GFL VSG/GFL VSG positive and negative sequence separation LVRT control strategy, further improving system's LVRT capability. Finally, the feasibility of this method is further validated by applying it to photovoltaic energy storage micro-grid.