The design of delay stability in DC microgrids with distributed control
YANG Jian
YUAN Wen-bin
NIE Yu-wen
LIU Zhang-jie
HAN Hua
DONG Mi
Abstract：The impact of communication delay on direct-current (DC) microgrids performance has been neglected normally in most controller designs, which may cause system instability. The effect of communication delay on system stability is studied based on a distributed control strategy. Combined with Razumikhin stability theory, a novel delay-independent stability criterion for the system with time-varying delays is proposed based on another delay-independent stability criterion, the delay-dependent stability of the system is analyzed for practical application, and the delay upper bound which can guarantee the system stability is given. Specifically, an approach which defines the feasible regions of control parameters is derived to guarantee the system stability under the condition of delay. Compared with the first-order inertia loops, this method provides a wider delay boundary, which makes the system safer, more reliable and stable. Finally, simulation and experimental results verify that the feasible regions of control parameters can guarantee the system stability under maximum delay.
Keywords：DC microgridsdistributed controldelay-independent stabilitydelay-dependent stabilityRazumikhin stability theorylinear matrix inequality (LMI)
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1074-1083 )