Review of transient control strategies for grid-forming converters under grid voltage sag conditions

LIN Yuxuan

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Review of transient control strategies for grid-forming converters under grid voltage sag conditions

更新时间：2025-10-23

- Review of transient control strategies for grid-forming converters under grid voltage sag conditions
- Vol. 44, Issue 2, Pages: 55-68(2025)
- 作者机构：
  
  南瑞集团国网电力科学研究院有限公司,江苏,南京,211106
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM712
- Published：2025
- 稿件说明：
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LIN Yuxuan. Review of transient control strategies for grid-forming converters under grid voltage sag conditions[J]. 2025, 44(2): 55-68.
DOI：

LIN Yuxuan. Review of transient control strategies for grid-forming converters under grid voltage sag conditions[J]. 2025, 44(2): 55-68. DOI：

摘要

随着大量新能源通过电力电子变流器接入电网，电力系统面临惯性降低、抗扰和暂态支撑能力下降等问题，构网型变流器的自主同步和主动支撑特性可以有效提升新能源并网稳定性和系统支撑能力。暂态电压扰动下构网型变流器并网控制策略与设备及系统的稳定性存在紧密联系，文中重点关注电网电压跌落的扰动场景，围绕构网型变流器暂态控制策略展开综述。首先，归纳目前典型的构网型变流器同步控制策略；其次，揭示构网型变流器过电流的产生机理并分析变流器暂态期间的过流和支撑特性；然后，将当前构网型变流器暂态控制策略分为两类进行梳理，并对比讨论两类控制策略的原理、研究现状和优缺点；最后，展望未来高比例新能源电力系统中构网型变流器并网问题的研究方向。

Abstract

As a large amount of renewable energy is integrated into the grid via power electronic converters，the power system is faced with challenges，such as reduced inertia，diminished disturbance resistance，and declining transient support capabilities. The stability of the renewable energy interconnected with the grid and the capability of supporting the grid are enhanced by the autonomous synchronization and active support capacity of grid-forming converters. The grid-connected control strategy of grid-forming converters is closely related to the stability of the device and system under transient voltage disturbances. This paper focuses on disturbances caused by grid voltage sags and reviews the transient control strategies of grid-forming converters. Firstly，current synchronization control strategies of grid-forming converters are summarized. Next，the mechanism of overcurrent generation in grid-forming converters is revealed，and the overcurrent behavior and support characteristics of converters during transient periods are analyzed. Then，transient control strategies are classified into two major types，and the principles，research status，advantages and disadvantages of these two types of control strategies are comparatively discussed. Finally，future research directions for grid-connected issues of grid-forming converters in high-penetration renewable energy power systems are prospected.

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