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To address the frequency fluctuation issue caused by load mutations in the offline mode of virtual synchronous generators(VSG)and the insufficient dynamic response of traditional proportional-integral(PI)control,this paper proposes a VSG secondary frequency regulation strategy based on linear active disturbance rejection control(LADRC). First,the mathematical model of the off-grid VSG is established,and a LADRC-based frequency control scheme is designed.Its core employs a linear extended state observer(LESO)to observe and estimate the total system disturbances in real time,achieving dynamic compensation through linear state error feedback(LSEF).Finally,a simulation model is built on the Matlab/Simulink platform to conduct comparative analysis of the frequency regulation performance of PI control and LADRC under different load mutation scenarios.The simulation results demonstrate that,compared to traditional PI control,LADRC exhibits superior anti-disturbance capability and faster dynamic response speed,significantly reducing frequency fluctuations and enhancing the dynamic stability characteristics of microgrid frequency.Notably,it maintains stable control performance even under multiple continuous load disturbances. The research results provide a theoretical basis and technical reference for optimizing the frequency control strategy of off-grid VSGs,offering practical application value for improving the stability of microgrids or independent power systems.
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Basic Information:
DOI：10.20097/j.cnki.issn1007-9904.2025.06.001
China Classification Code:TM341
Citation Information:
[1]DING Hongzhi,PAN Bo,GUO Xiaorui ,et al.Frequency Regulation Method for Off-grid Virtual Synchronous Generators Based on Linear Active Disturbance Rejection Control[J].Shandong Electric Power,2025,52(06):1-9.DOI:10.20097/j.cnki.issn1007-9904.2025.06.001.
Fund Information:
浙江省电力有限公司集体企业科技项目资助(HZTLKJ2023-01); 四川省科技计划区域创新项目(2024YFHZ0089)~~
2025-06-25
2025-06-25