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Conventional and Reverse Droop Control in Islanded Microgrid: Simulation and Experimental Test

pubblicazioni - Memoria

Conventional and Reverse Droop Control in Islanded Microgrid: Simulation and Experimental Test

L’articolo presenta i risultati ottenuti in simulazione e in prova sperimentale a riguardo del funzionamento inisola di una microrete in bassa tensione. Si analizzano gli schemi di controllo locali di generatori distribuiti adatti al funzionamento in isola, ossia il conventional e il reverse droop control. Viene presentata la soluzione adottata da RSE per quanto riguarda la caratteristica di droop da utilizzare in una microrete in bassa tensione per garantire una gestione stabile della stessa, regolando in modo disaccoppiato tensione e frequenza.

Local control of Distributed Energy Resources (DER) in microgrids usually relies on droop algorithm in order to ensure stability to the system in islanded operation. Conventional and reverse droop control are applied respectively to Voltage Control Mode (VCM) inverters and to Current Control Mode inverters (CCM).

In low-voltage microgrid, traditional P-ω and Q-V droop characteristic is subject to the power coupling and could lead to unstable operating conditions due to dependence of load on the voltage and on the frequency. Therefore P-V and Q-ω droop characteristic, named resistive droop, is used in simulations and in experimental tests to show its effectiveness for a stable and decoupled regulation of islanded LV microgrid.

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