Active Disturbance Rejection Control Strategy for Power Coordination of Interlinking Converters in AC/DC Microgrids

doi:10.12096/j.2096-4528.pgt.260118

Abstract

Abstract:

Objectives To ensure stable and smooth energy flow between AC and DC subnets and address the degradation of interlinking converter control performance caused by uncertain switching of high-power AC or DC loads, a power coordination control strategy for interlinking converters based on a second-order linear active disturbance rejection controller is proposed. Methods Based on the transmission power of the converters, a current observer is utilized to estimate the disturbance caused by high-power load switching in the AC or DC subnet. Then, the disturbance is compensated in the feedback channel of the control loop to ensure that the frequency of the AC subnet and the bus voltage of the DC subnet can always remain within permissible ranges during high-power load switching. Finally, an electromagnetic transient simulation model of an isolated AC-DC hybrid microgrid is established based on MATLAB/Simulink to verify the effectiveness of the proposed ADRC-based power coordination control strategy. Results When a large power load is switched on in an independent microgrid, the proposed control strategy can accurately regulate the active power flowing through the interconnected converter in real time, ensuring that the AC subnet frequency and DC bus voltage are within the stable operating range, so as to solve the problem of using traditional PI controllers. The problem of system instability caused by lagging tracking large load switching.[Conslusions] A comparison with traditional control strategies shows that the proposed control strategy improves the reliability and stability of the microgrid.

Key words: AC/DC microgrid, interlinking converter, active disturbance rejection control (ADRC), droop control, load switching, control strategy

CLC Number:

TK 01

Sumei LIU, Wencheng XU, Xiran SUN, Fei YU, Chunhe HU. Active Disturbance Rejection Control Strategy for Power Coordination of Interlinking Converters in AC/DC Microgrids[J]. Power Generation Technology, 2026, 47(1): 195-203.

Figures/Tables 11

Fig. 1 Topology of AC/DC microgrid

Fig. 2 ADRC-based control block diagram of interlinking converters in AC/DC microgrid

Fig. 3 Schematic diagram of current inner loop control based on ADRC controller

Fig. 4 Topology of hybrid microgrid model

Tab.1 Main parameters of hybrid microgrid simulation

参数	数值	参数	数值
额定直流母线电压/kV	0.8	TD环节r₀	30
额定交流子网频率/Hz	50	TD环节h	400 000
控制外环有功功率参考/kW	30	NLSEF环节β₁	0.000 25
控制外环电压比例增益k₁	0.13	NLSEF环节β₂	20
控制外环频率比例增益k₂	1 000	ESO环节ω₀	10
控制外环功率比例增益k₃	0.001 3

Fig. 5 Active power variation curves under 60 kW load switching

Fig. 6 AC frequency variation curves under 60 kW load switching

Fig. 7 DC voltage variation curves under 60 kW load switching

Fig. 8 Active power variation curves under 30 kW load switching

Fig. 9 AC frequency variation curves under 30 kW load switching

Fig. 10 DC voltage variation curves under 30 kW load switching

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