Analysis on Key Influence Factors of Ratio of Grid-forming and Grid-following Converters in Hybrid Parallel Grid-connected System

ZHANG Bin; ZHANG Xueguang; XU Dianguo

doi:10.7500/AEPS20240111006

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Analysis on Key Influence Factors of Ratio of Grid-forming and Grid-following Converters in Hybrid Parallel Grid-connected System

Grid-forming Technology | 更新时间：2025-06-16

- Analysis on Key Influence Factors of Ratio of Grid-forming and Grid-following Converters in Hybrid Parallel Grid-connected System
- Automation of Electric Power Systems Vol. 49, Issue 1, Pages: 47-58(2025)
- 作者机构：
  
  哈尔滨工业大学电气工程及自动化学院，黑龙江省哈尔滨市 150001
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(51977046)
- DOI：10.7500/AEPS20240111006
  CLC：
- Received：11 January 2024，
  
  Revised：2024-06-20，
  
  Published Online：23 September 2024，
  
  Published：10 January 2025
- 稿件说明：
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张斌,张学广,徐殿国.构网型与跟网型变流器混联并网系统配比关键影响因素分析[J].电力系统自动化,2025,49(1):47-58.

ZHANG Bin,ZHANG Xueguang,XU Dianguo.Analysis on Key Influence Factors of Ratio of Grid-forming and Grid-following Converters in Hybrid Parallel Grid-connected System[J].Automation of Electric Power Systems,2025,49(1):47-58.
张斌,张学广,徐殿国.构网型与跟网型变流器混联并网系统配比关键影响因素分析[J].电力系统自动化,2025,49(1):47-58. DOI： 10.7500/AEPS20240111006.

ZHANG Bin,ZHANG Xueguang,XU Dianguo.Analysis on Key Influence Factors of Ratio of Grid-forming and Grid-following Converters in Hybrid Parallel Grid-connected System[J].Automation of Electric Power Systems,2025,49(1):47-58. DOI： 10.7500/AEPS20240111006.

摘要

跟网型变流器在弱电网下存在次同步振荡失稳风险，构网型变流器可以改善混联系统在弱电网下次同步频段的稳定性。在新能源场站中可以适当配置构网型单元提高系统稳定性，故构网型/跟网型变流器的配比是影响系统稳定性的关键因素。文中针对构网型与跟网型变流器混联并网系统小干扰稳定性问题，研究了变流器控制系统特性对构网型变流器配比边界条件的影响。首先，建立了构网型与跟网型变流器混联并网系统的状态空间模型，在此基础上分析了构网型/跟网型变流器控制系统各关键参数以及构网型变流器中电压环控制结构对系统稳定性的影响。从保证系统次同步频段小干扰稳定的角度出发，分析了混联系统中构网型变流器配比下限的关键影响因素，得到了各影响因素约束下配比的稳定边界，并利用频域阻抗法对各影响因素的影响机理进行了解释。最后，基于RT-LAB半实物平台验证了理论分析的准确性。

Abstract

The grid-following converters have the risk of sub-synchronous oscillation (SSO) instability in the weak grid. The grid-forming converters can improve the stability of the hybrid parallel system in the sub-synchronous frequency range in the weak grid. The proper configuration of grid-forming units in renewable energy stations can enhance the system stability. Therefore

the ratio of grid-forming and grid-following converters is a key factor influencing the system stability. Aiming at the small-signal stability issue in the hybrid parallel grid-connected system with grid-forming and grid-following converters

this paper studies the influence of converter control system characteristics on the boundary conditions for the ratio of the grid-forming converter. First

the state space model of the hybrid parallel grid-connected system of grid-forming and grid-following converters is established. On this basis

this paper analyzes the influence of key parameters of grid-following/grid-forming control systems and the voltage loop control structures of grid-forming converter on the system stability. From the perspective of maintaining the small-signal stability of the system in the sub-synchronous frequency range

this paper analyzes the key influence factors for the lower limit of the ratio of grid-forming converters in the hybrid parallel system. The stability boundary under the constraint of each influence factor is obtained. In addition

the frequency-domain impedance method is used to explain the influence mechanism of each influence factor. Finally

the accuracy of the theoretical analysis is verified based on the RT-LAB semi-physical platform.

关键词

Keywords

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