Voltage and frequency control of islanded microgrids: A plug-and-play approach

Plug-and-Play Voltage Stabilization in Inverter-Interfaced Microgrids via a Robust Control Strategy

“…To verify the performance of the proposed control approach, we consider an islanded inverter-intefaced microgrid consisting of 11 DGs with meshed topology, borrowed from [34], as graphically shown in Fig. 4.…”

“…Various voltage controller design methods such as robust servomechanism controllers [20], [23], [26], full-order H • controllers [24], robust two-degree-of-freedom control strategy [28], multivariable voltage control scheme based on loopshaping approaches [27], decentralized state feedbacks [29], and robust fixed-order decentralized H • control approach [30] have been proposed. The proposed methods regulate the voltage of a single-DG [22]- [24], [27], [28] and/or a multi-DG microgrid [20], [26], [29]- [34]. In these methods, the frequency of each DG is controlled through an internal oscillator in an open-loop manner with w 0 = 2p f 0 , where f 0 is the nominal system frequency.…”

“…Recently, a decentralized control strategy has been developed in [29], [34] which is based on a Quasi-Stationary Line (QSL) approximated model of microgrids [36] and the idea of neutral interactions [37]. According to this control technique, when a DG is plugged in and/or plugged out, the other DGs which are physically connected to it have to retune their local controllers.…”

“…Therefore, opposed to most non-droop-based control methods, e.g. [20], [26], [29], [30], [34], the present approach does not require to retune the local controllers in the case of PnP operation of DGs and topology change. Moreover, unlike the droop control strategy, the proposed approach guarantees the stability of the microgrid system under PnP functionality of DGs.…”