Low-voltage ride-through control with positive and negative sequence voltage support for grid-forming inverters

ZHANG Haobo; CHEN Jian; TIAN Jiachang; ZHANG Wen

doi:10.19783/j.cnki.pspc.260351

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Low-voltage ride-through control with positive and negative sequence voltage support for grid-forming inverters

更新时间：2026-10-15

- Low-voltage ride-through control with positive and negative sequence voltage support for grid-forming inverters
- Power System Protection and Control Vol. 54, Issue 20, (2026)
- 作者机构：
  
  电网智能化调度与控制教育部重点实验室(山东大学),山东,济南,250061
- 作者简介：
- 基金信息：
- DOI：10.19783/j.cnki.pspc.260351
  CLC：
- Published：2026
- 稿件说明：
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ZHANG Haobo, CHEN Jian, TIAN Jiachang, et al. Low-voltage ride-through control with positive and negative sequence voltage support for grid-forming inverters[J]. Power System Protection and Control, 2026, 54(20).
DOI：

ZHANG Haobo, CHEN Jian, TIAN Jiachang, et al. Low-voltage ride-through control with positive and negative sequence voltage support for grid-forming inverters[J]. Power System Protection and Control, 2026, 54(20). DOI： 10.19783/j.cnki.pspc.260351.

摘要

针对构网型(grid-forming

GFM)逆变器在不对称电网故障下低电压穿越过程中存在的过流抑制与电压支撑难以兼顾的问题，提出一种兼顾电流限制与正负序电压支撑的构网型逆变器低电压穿越控制策略。首先，建立不对称故障下GFM逆变器的正、负序等效网络模型，在最大相电流约束下分别引入正序与负序虚拟阻抗，实现电流限幅。其次，基于并网点(point of common connection

PCC)正、负序电压与电流之间的相量关系，推导出面向正、负序电压给定值的虚拟阻抗参数设计方法，实现对并网点正、负序电压的精确支撑。最后，分析了稳定性约束下所提策略可实现的最大电压支撑能力，并给出故障期间有功参考值修正原则。仿真结果验证了所提方法在不对称故障下电流限制、精确电压支撑以及发挥最大电压支撑能力的有效性。

Abstract

To address issues that grid-forming (GFM) inverters cannot balance the trade-off between overcurrent suppression and voltage support during low-voltage ride-through (LVRT) under asymmetric grid faults

a LVRT control strategy that coordinates current limitation and positive-/negative-sequence voltage support is proposed. First

an equivalent network model for the positive- and negative-sequence currents of GFM inverters under asymmetric faults is established. Positive- and negative-sequence virtual impedances are introduced under the constraint of maximum phase current

thereby achieving current limiting. Second

based on the phasor relationship between the positive- and negative-sequence voltages and currents at the point of common connection (PCC)

a method for designing virtual impedance parameters based on specified positive- and negative-sequence voltage values is derived. The proposed method achieves precise support for the positive- and negative-sequence voltages at the PCC. Finally

the maximum voltage support capability achievable by the proposed strategy under stability constraints is analyzed

and principles for correcting the active power reference value during faults are presented. Simulation results validate the effectiveness of the proposed method in terms of current limiting

precise voltage support

and maximizing voltage support capability during asymmetric faults.

关键词

Keywords

references

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