Grid Forming Control Strategy Based on Improved SMC for Modular Cascade High-voltage Direct-mounted Energy Storage

XU Zhiyang; CHEN Laijun; SU Xiaoling; ZHAO Zhengkui; YANG Jun; XU Decao

doi:10.14044/j.1674-1757.pcrpc.2025.02.007

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Grid Forming Control Strategy Based on Improved SMC for Modular Cascade High-voltage Direct-mounted Energy Storage

Key Technology of Grid-friendly Control and Optimized Operation for New Energy Base | 更新时间：2025-04-29

- Grid Forming Control Strategy Based on Improved SMC for Modular Cascade High-voltage Direct-mounted Energy Storage
- Power Capacitor & Reactive Power Compensation Vol. 46, Issue 2, Pages: 53-61(2025)
- 作者机构：
  
  1.青海大学新能源电力系统智慧运行教育部重点实验室，西宁　 810016
  2.清华大学电机工程与应用电子技术系，北京　 100084
  3.国网青海省电力公司电力科学研究院，西宁　 810001
  4.国家能源集团青海电力有限公司，西宁　 810002
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2025.02.007
  CLC：
- Received：01 January 2025，
  
  Published：25 April 2025
- 稿件说明：
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XU Zhiyang, CHEN Laijun, SU Xiaoling, et al. Grid Forming Control Strategy Based on Improved SMC for Modular Cascade High-voltage Direct-mounted Energy Storage[J]. Power capacitor & reactive power compensation, 2025, 46(2): 53-61.
DOI：

XU Zhiyang, CHEN Laijun, SU Xiaoling, et al. Grid Forming Control Strategy Based on Improved SMC for Modular Cascade High-voltage Direct-mounted Energy Storage[J]. Power capacitor & reactive power compensation, 2025, 46(2): 53-61. DOI： 10.14044/j.1674-1757.pcrpc.2025.02.007.

摘要

高压直挂式构网型储能是解决新能源电力系统电压频率问题的关键设备。大扰动工况下电网电压频率快速变化，要求快速支撑和抗扰动能力。本文首先基于高压直挂式储能拓扑建立了大扰动工况下的数学模型。在此基础上，提出了基于滑模控制的高压直挂式构网型储能控制策略，通过改进滑模面及趋近律函数解决抖振问题。并提出了基于幂次函数的滑模控制律。最后，建立李雅普洛夫函数证明改进滑模构网控制策略满足稳定条件。仿真结果表明，与采用比例积分控制器的构网型控制系统相比，模块化级联高压直挂式构网型储能系统采用基于改进滑模控制具备更强的抗干扰能力和电压支撑效果。

Abstract

High-voltage direct-mounted grid-forming energy storage is a key device for solving voltage and frequency in new energy power systems. Under large disturbance conditions

the rapid changes in grid voltage and frequency require rapid support and disturbance rejection capabilities. In this paper

a mathematical model for high-voltage direct-mounted energy storage under large disturbance conditions based on its topology is set up firstly. On this basis

a control strategy for high-voltage direct-hung grid-forming energy storage based on sliding mode control is proposed

which addresses the chattering problem by improving the sliding surface and the reaching law function. Additionally

a sliding mode control based on a power function is proposed. Finally

a Lyapunov function is set up to prove that the improved sliding mode grid-forming control strategy meets the stability conditions. The simulation results show that compared with the grid-forming control system using a proportional-integral controller

the modular cascaded high-voltage direct-mounted grid-forming energy storage system using the improved sliding mode control has stronger disturbance resistance capabilities and voltage support effects.

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