Small-Signal Analysis of the Microgrid Secondary Control Considering a Communication Time Delay

Ernane Antônio Alves Coelho, Dan Wu, Josep M. Guerrero, Juan C. Vasquez, Tomislav Dragičević, Čedomir Stefanović, Petar Popovski

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120 Citationer (Scopus)


This paper presents a small-signal analysis of an islanded microgrid composed of two or more voltage-source inverters connected in parallel. The primary control of each inverter is integrated through an internal current and voltage loops using proportional resonant compensators, a virtual impedance, and an external power controller based on frequency and voltage droops. The frequency restoration function is implemented at the secondary control level, which executes a consensus algorithm that consists of a load-frequency control and a single time delay communication network. The consensus network consists of a time-invariant directed graph and the output power of each inverter is the information shared among the units, which is affected by the time delay. The proposed small-signal model is validated through simulation results and experimental results. A root locus analysis is presented that shows the behavior of the system considering control parameters and time delay variation.
TidsskriftIEEE Transactions on Industrial Electronics
Udgave nummer10
Sider (fra-til)6257-6269
Antal sider13
StatusUdgivet - okt. 2016


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