Linear Active Disturbance Rejection Control Parameter Tuning Method for Energy Storage Converter with Enhanced Stability

doi:10.11930/j.issn.1004-9649.202402009

Abstract

Abstract:

In order to compensate for the negative impedance characteristics of constant power load in the direct current (DC) microgrid, it is necessary to speed up the response speed of the hybrid energy storage system and give full play to its performance. This paper proposed a linear active disturbance rejection control parameter tuning method based on the mixed potential function theory for the energy storage converter of the microgrid. Firstly, the active disturbance rejection transfer function of the energy storage converter was derived. Then, the stability of the DC microgrid with a hybrid energy storage system and constant power load was analyzed, and the mixed potential function criterion considering the bandwidth ω₀ of the extended state observer was derived, which provided an important basis for tuning the linear extended state observer bandwidth and the state error feedback control parameter of the energy storage converter with active disturbance rejection control. Experimental results show that the proposed method has a fast response speed and strong disturbance rejection ability, which ensures the stable operation of the DC microgrid system.

Key words: DC microgrid, energy storage converter, linear active disturbance rejection, parameter tuning, mixed potential function

Shilong LI, Longjiang LI, Xinbo LIU, Hua ZHANG. Linear Active Disturbance Rejection Control Parameter Tuning Method for Energy Storage Converter with Enhanced Stability[J]. Electric Power, 2024, 57(10): 25-35.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202402009

https://www.electricpower.com.cn/EN/Y2024/V57/I10/25

Figures/Tables 17

Fig.1 Structure of linear active disturbance rejection

Fig.2 Bode plot of transfer function

Fig.3 Structure of bidirectional DC-DC converter

Fig.4 DC microgrid system structure and control diagrams

Fig.5 Equivalent model of DC microgrid system

Fig.6 Control structure of energy storage converter

Fig.7 Experimental platforms

Table 1 Parameters of DC microgrid experiment system

参数	充电	放电
直流母线电压/V	400	400
蓄电池端电压/V	200	200
微源电流/A	6	6
等效内阻/Ω	0.01	0.01
滤波电感/mH	1	1
滤波电容/μF	1000	1000
母线电容/μF	1000	1000
恒功率负载P₁, P₂/W	2000	4000

Fig.8 DC bus voltage waveforms with active disturbance rejection control satisfying discharge conditions

Fig.9 DC bus voltage waveforms with PI control satisfying discharge conditions

Fig.10 Battery current waveforms with active disturbance rejection and PI control satisfying discharge conditions

Fig.11 DC bus voltage waveforms with active disturbance rejection without satisfying discharge conditions

Fig.12 Battery current waveforms with active disturbance rejection control without satisfying discharge conditions

Fig.13 DC bus voltage waveforms with active disturbance rejection control satisfying charging conditions

Fig.14 Battery current waveforms with active disturbance rejection control satisfying charging conditions

Fig.15 DC bus voltage waveforms with active disturbance rejection control without satisfying charging conditions

Fig.16 Battery current waveforms with active disturbance rejection control without satisfying charging conditions

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