Distributed Secondary Control for DC Microgrid Under Dynamic Event Trigger

doi:10.12068/j.issn.1005-3026.2025.20240006

Abstract

Abstract:

Aiming at the secondary control issues in islanded DC microgrids， a distributed secondary control strategy based on a dynamic event-triggered mechanism is proposed for DC microgrid containing multiple distributed generators. Building upon distributed secondary control， dynamic event-triggered conditions are designed for both the output average voltage and proportional current of each DG. This approach not only mitigates deviations between DC bus voltage and the nominal value caused by droop gains but also maintains current sharing accuracy while significantly conserving communication resources and reducing redundancy. The designed event-triggered conditions incorporate a dynamic term that adaptively adjusts event-triggered thresholds， effectively decreasing controller update frequency. The feasibility of this event-triggered mechanism is rigorously proven through Lyapunov stability theory， with the absence of Zeno behavior being guaranteed. Finally， a simulation model developed in MATLAB/Simulink validates the effectiveness of the proposed control strategy.

Key words: DC microgrid, distributed secondary control, dynamic event-triggered mechanism, communication redundancy, voltage adjustment, current distribution

CLC Number:

TP 273

Fan-wei MENG, Yuan-zheng TAI, Yu ZHANG, Ai-ping PANG. Distributed Secondary Control for DC Microgrid Under Dynamic Event Trigger[J]. Journal of Northeastern University(Natural Science), 2025, 46(6): 16-25.

Figures/Tables 15

Fig.1 Primary control block diagram of DC microgrid

Fig.2 Distributed secondary control of DC microgrid

Fig.3 Distributed secondary control for DC microgrid based on dynamic event-triggered mechanism

Fig.4 System structure of DC microgrid

Table1 Simulation parameters of microgrid［7］

参数	数值
输入电压/V	100
输出电压标称值/V	48
开关频率/kHz	1.25
滤波电容/ $μ F$	2 200
滤波电感/mH	10
电压环比例系数电压环积分系数	4 800
电流环比例系数电流环积分系数	5 110
线路阻抗/ $Ω$	0.01

Table1 Simulation parameters of microgrid［7］

参数	数值
输入电压/V	100
输出电压标称值/V	48
开关频率/kHz	1.25
滤波电容/ $μ F$	2 200
滤波电感/mH	10
电压环比例系数电压环积分系数	4 800
电流环比例系数电流环积分系数	5 110
线路阻抗/ $Ω$	0.01

Fig.5 DC bus voltage of DG under droop control

Fig.6 Output current of DG under droop control

Fig.7 Output voltage of DG when the load changes

Fig.8 Output current of DG when the load changes

Fig.9 Trigger times of average voltage control when the load changes

Fig.10 Trigger times of proportional current control when the load changes

Fig.11 Output voltage of the DGs when the back-up DG is plugged in and out

Fig.12 Output current of the DGs when the back-up DG is plugged in and out

Fig.13 Trigger times of average voltage control when the back-up DG is plugged in and out

Fig.14 Trigger times of proportional current control when the back-up DG is plugged in and out

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