Circulating Current Suppression and Power Control of Paralleled Bidirectional Interlinking Converters in Hybrid AC/DC Microgrid

doi:10.11985/2022.01.005

Abstract

Abstract:

Aiming at the power flow, distribution and circulation problems when multiple bidirectional interlinking converters (BICs) are operating in parallel in AC-DC hybrid microgrids, a distributed power management control strategy for multi-parallel BICs is proposed. Each BIC is designed with an independent local distributed controller, which calculates its own power reference value, and can be allocated proportionally according to different power ratings to realize the power flow between the two sub-networks and the power distribution between different BICs. In addition, based on the null vector feedforward control strategy, a virtual BIC concept is proposed to realize the multi-parallel BIC circulating current suppression. The simulation and hardware-in-the-loop experimental results show that the strategy can effectively control the power flow between the two sub-networks and suppress the circulating current between multiple modules.

Key words: Hybrid AC/DC microgrid, bidirectional interlinking converter, power flow, locally distributed control, circulation suppression

CLC Number:

TM461

GUO Qiang, XIANG Wenkai, LI Shan. Circulating Current Suppression and Power Control of Paralleled Bidirectional Interlinking Converters in Hybrid AC/DC Microgrid[J]. Journal of Electrical Engineering, 2022, 17(1): 31-40.

Figures/Tables 16

References 21

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		数值
交流侧	f_acmax, f_acmin/Hz	51, 49
	P_acmax/kW	40
	L_a/mH	1.35
	C_a/μF	60
	a	2/40 000
	E_a/V	700
直流侧	V_dcmax, V_dcmin/V	710, 690
	P_dcmax/kW	40
	L_d/mH	2
	C_d/μF	470
	d	20/40 000
	E_d/V	380
并联BIC	P_1max, P_2max, P_3max/kW	6, 9, 18
	g₁, g₂, g₃	1, 0, 0
	L₁, L₂, L₃/mH	4, 5, 6