Transient Overvoltage Suppression in Grid-forming Energy-storage SVG-based Renewable Energy HVDC Outbound Systems

ZHANG Jianpo; LI Yongyun; HUANG Yong; JIA Jiaoxin; JIANG Deren; GAO Benfeng; YANG Zhichang

doi:10.20204/j.sp.2025.08001

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Transient Overvoltage Suppression in Grid-forming Energy-storage SVG-based Renewable Energy HVDC Outbound Systems

更新时间：2025-10-24

- Transient Overvoltage Suppression in Grid-forming Energy-storage SVG-based Renewable Energy HVDC Outbound Systems
- Vol. 53, Issue 8, Pages: 1-10(2025)
- 作者机构：
  
  1. 新能源电力系统国家重点实验室华北电力大学,河北,保定,071003
  2. 国家电网有限公司,北京,100031
- 作者简介：
- 基金信息：
- DOI：10.20204/j.sp.2025.08001
  CLC：
- Published：2025
- 稿件说明：
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张建坡,李永赟,黄勇,贾焦心,姜德仁,高本锋,杨志昌.基于构网储能型SVG新能源直流外送系统暂态过电压抑制[J].智慧电力,2025,53(8):1-10.

ZHANG Jianpo, LI Yongyun, HUANG Yong, et al. Transient Overvoltage Suppression in Grid-forming Energy-storage SVG-based Renewable Energy HVDC Outbound Systems[J]. 2025, 53(8): 1-10.
张建坡,李永赟,黄勇,贾焦心,姜德仁,高本锋,杨志昌.基于构网储能型SVG新能源直流外送系统暂态过电压抑制[J].智慧电力,2025,53(8):1-10. DOI： 10.20204/j.sp.2025.08001.

ZHANG Jianpo, LI Yongyun, HUANG Yong, et al. Transient Overvoltage Suppression in Grid-forming Energy-storage SVG-based Renewable Energy HVDC Outbound Systems[J]. 2025, 53(8): 1-10. DOI： 10.20204/j.sp.2025.08001.

摘要

以新能源直流外送系统典型场景为研究对象，阐明换相失败引发的送端暂态过电压时空分布特性。为克服传统跟网型静止无功发生器（SVG）在暂态过程中电压支撑能力的局限，基于级联H桥子模块直流电容侧耦合储能单元，构建具备电网电压/频率主动支撑能力的构网型储能SVG（GFM-ESVG）模型；同时提出融合限流与暂态电压支撑的协同故障穿越策略，维持其暂态电压源特性。进而定性对比分析GFM-ESVG与传统SVG在暂态过电压抑制能力上的差异。最终，PSCAD/EMTDC仿真表明，在有效抑制换相失败所致送端暂态过电压的同时，GFM-ESVG可显著提升风电机组暂态功率输送能力，并一定程度上抑制系统频率波动。

Abstract

Focusing on the typical scenarios of renewable energy HVDC outbound systems，this study clarifies the spatiotemporal distribution characteristics of transient overvoltage at the sending end caused by commutation failure.To overcome the limitations of conventional grid-following static var generator （SVG） in voltage support capability during transients，a grid-forming energy-storage SVG （GFM-ESVG） model with active grid voltage/frequency support capability is constructed by coupling energy storage units to the DC capacitor side of cascaded H-bridge submodules.Simultaneously，a coordinated fault ride-through strategy integrating current limiting and transient voltage support is proposed to maintain its transient voltage source characteristics.Qualitative comparative analysis further reveals the differences in transient overvoltage suppression capabilities between GFM-ESVG and traditional SVG.Finally，PSCAD/EMTDC simulations demonstrate that GFM-ESVG not only effectively suppresses transient overvoltage at the sending end induced by commutation failure but also significantly enhances the transient power transmission capability of wind turbines while partially mitigating system frequency oscillations.

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