Distributed Cooperative Secondary Frequency Modulation Control of Virtual Synchronous Generator in Islanded Microgrid

doi:10.11985/2024.01.036

Abstract

Abstract:

Based on the frequency deviation problem of primary control of virtual synchronous generators in isolated island microgrid, a distributed secondary frequency control strategy based on predetermined time system is proposed. This strategy improves the consistency of the predetermined system and adapts the virtual synchronous generator ontology algorithm, so that each inverter only relies on the communication of adjacent units, and the active power deficit of the system can be distributed according to capacity and frequency without difference control. At the same time, the system can further improve the speed of frequency recovery by setting the convergence time of consistency in advance, without considering the impact of initial capacity and protocol parameters, which is conducive to the plug and play of distributed power supply and improve the operation efficiency. Finally, the feasibility and effectiveness of the proposed control strategy are verified by simulation.

Key words: Island microgrid, virtual synchronous generator(VSG), consistency algorithm, secondary frequency control, frequency timing recovery

CLC Number:

TM761

LI Bin, GONG Xiangxiang, HU Dandan, ZENG Zhihui, WANG Hao. Distributed Cooperative Secondary Frequency Modulation Control of Virtual Synchronous Generator in Islanded Microgrid[J]. Journal of Electrical Engineering, 2024, 19(1): 334-343.

Figures/Tables 13

References 20

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参数	数值	参数	数值
R_i/Ω	0.1	U_dc/V	700
L_i/mH	2	U^*/V	311
C_i/μF	150	U	5
f/Hz	50	V	9
k_p	0.01	δ	0.05
Z_line₁/Ω	0.10+j0.002 5	J	1.5
Z_line₂/Ω	0.15+j0.002 8	λ₂	2
Z_line₃/Ω	0.12+j0.003 0	D₁, D₂	15
Z_line₄/Ω	0.18+j0.003 2	D₃, D₄	30
P_n₁, P_n₂/W	1 000	Load1	6 kW+3 kVar
P_n₃, P_n₄/W	2 000	Load2	6 kW+3 kVar