Research on Control Strategy of Bidirectional Buck-Boost Converter in DC Microgrid Based on Active Disturbance Rejection Control

doi:10.12096/j.2096-4528.pgt.20123

Abstract

Abstract:

In order to reduce the fluctuation of DC microgrid bus voltage, a bidirectional Buck-Boost converter control strategy based on active disturbance rejection control (ADRC) was proposed. The control method of DC bus voltage outer loop and DC converter inductance current inner loop was used to realize the bidirectional flow of energy between the DC microgrid and the energy storage system. It was further proposed to observe the total output disturbance based on the extended state observer (ESO), including the change of load current and bus voltage. Before the load disturbance current affects the final output of the DC bus voltage of the system, the disturbance information was actively extract from the input signal inductance current or the output signal bus voltage of the controlled object in the outer loop. Then, the control signal was used to eliminate the disturbance information as soon as possible, which reduces the influence on the controlled quantity, and further suppresses the voltage fluctuation and impact of the transient DC bus. Therefore, the bus voltage can quickly recover to the normal working state when the bus voltage fluctuates. The correctness of the proposed control strategy was verified by simulation. The simulation results show that the energy storage system can achieve bidirectional energy transfer through the control strategy. In addition, when the bus generates power fluctuations and current shocks, the energy storage system can stabilize the DC bus voltage and improve the system the reliability.

Key words: DC microgrid, bidirectional Buck-Boost converter, bus voltage fluctuation, active disturbance rejection controller (ADRC)

CLC Number:

TK01
TM46

Xin LU, Zhongli CHEN, Hui LI. Research on Control Strategy of Bidirectional Buck-Boost Converter in DC Microgrid Based on Active Disturbance Rejection Control[J]. Power Generation Technology, 2021, 42(2): 193-200.

Figures/Tables 10

Fig.1 DC microgrid structure diagram

Fig.2 Simplified DC microgrid structure diagram

Fig.3 Conventional DC bus voltage control structure

Fig.4 Control block diagram with LADRC controller

Tab. 1 DC microgrid model system parameters

参数	数值	参数	数值
母线电压u_dc/V	100	电容C/μF	200
储能电池输出电压u_b/V	48	电容C_b/μF	200
恒功率源输出电流i_cps/A	10	电感L/mH	0.2
恒功率负载P/kW	0.45	电阻R/Ω	50

Tab. 2 Controller parameters

控制器	参数	数值
双环PI控制器	k_{p_in}	10
	k_{i_in}	100
	k_{p_out}	60
	k_{i_out}	600
外环LADRC内环PI控制器	k_{p_in}	10
	k_{i_in}	100
	ω_c/(rad/s)	2 000
	ω_o/(rad/s)	10 000
	b₀	2 400

Fig.5 Comparison of Bode diagrams

Fig.6 Changing conditions

Fig.7 Response of output voltage

Fig.8 Response of inductor current

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