Distributed Cooperative Disturbance-Rejection Control of Hybrid Alternating Current/Direct Current Distribution Grids with Multiple Inverters

doi:10.16183/j.cnki.jsjtu.2023.492

Abstract

Abstract:

Voltage stability control in distribution grids faces challenges due to strong nonlinearity, modeling error of power electronic devices, and external disturbances. Distributed cooperative disturbance-rejection control of multiple inverters is a novel and promising approach to improve voltage stability in distribution grids. First, the high-dimension model of inverters is simplified into an equivalent input-output model. An extended state high-gain observer is utilized to estimate the effects of multiple disturbances in the equivalent model. Then, a distributed cooperative control strategy for multiple converters is designed based on the consensus theory, achieving coordinated voltage control and active disturbance suppression by integrating the disturbance estimation results. To ensure the dynamic performance of the distributed controller, an optimal topology selection method is proposed based on the graph theory and network control system. A test system consisting of four inverters is built in PowerFactory to verify the proposed control strategy. The simulation results show that the proposed control strategy effectively realizes coordinated voltage tracking control and suppress external disturbances.

Key words: distribution grid, high gain observer, distributed control, consensus theory, disturbance rejection control

CLC Number:

TM761

QUAN Shaoli, YU Haozheng, MA Jie, WANG Weiyu, GUO Yong, CHEN Chun. Distributed Cooperative Disturbance-Rejection Control of Hybrid Alternating Current/Direct Current Distribution Grids with Multiple Inverters[J]. Journal of Shanghai Jiao Tong University, 2025, 59(5): 605-616.

Figures/Tables 18

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Tab.1

Fig.7

Tab.2

Parameters of test system

参数种类	参数	数值	参数	数值
逆变器参数	额定容量/(MV·A)	1	交流额定电压/kV	10
	直流额定电压/kV	30	R_dc/Ω	2
	L_dc/mH	0.1273	C_dc/μF	750
	R_f/Ω	0.1	L_f/mH	1
	C_f/μF	50	R_g/Ω	0.1
	L_g/mH	0.5	$m P p . u .$	0.01
	$m Q p . u .$	0.01	ω_c/(rad·s^-1)	10
	$K p v p . u .$	1	$K i v p . u .$	20
	$K p c p . u .$	1	$K i c p . u .$	1000
线路参数	线路电阻/(Ω·km^-1)	0.5	线路电感/(mH·km^-1)	100
负荷参数	P_load1/kW	200	Q_load1/kvar	100
	P_load2/kW	300	Q_load2/kvar	200
	P_load3/kW	150	Q_load3/kvar	100

Tab.2

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方案	通信线路长度	B_t	λ₂
A	3.000	1.0	0.5857
B	3.000	2.0	0.5857
C	3.414	2.0	1.0000
D	4.000	0.5	2.0000
E	4.828	0.5	2.0000
F	4.414	2.0	1.0000