Abstract
A control strategy for an autonomous induction generator (IG) system synchronization and seamless transfer to an inverter-based microgrid (MG) is presented in the current paper. The IG system control in autonomous mode is performed by a combination between a Voltage Source Inverter (VSI) and a Dump Load (DL). The MG consists of an MG leading inverter having on its DC side a supercapacitor-based energy storage system, two MG supporting inverters, and local loads. The paper presents the IG control part for the VSI-DL system, as well as the synchronisation algorithm that enables the smooth interconnection with the MG. An analysis of the IG impact on an islanded MG is also provided. Experimental validations accomplished on a complex laboratory test-bench have focused on the dynamic events associated with the IG system connection/disconnection to/from the MG and also on the MG response to a load being turned on and off when the IG operates connected to the MG. The obtained results have shown that the proposed synchronization algorithm ensures a seamless transfer for the IG system from autonomous to MG connected mode and vice-versa. Moreover, when a significant load transient occurs within the MG operation, the IG presence does not alter the MG stability.
Highlights
The renewable energy sources (RES) play a major role in electricity generation nowadays, operating along with energy storage systems (ESS) in autonomous microgrids (MGs) or as distributed generators (DGs) connected to the grid
Experimental validations accomplished on a complex laboratory test-bench have focused on the dynamic events associated with the induction generator (IG) system connection/disconnection to/from the MG and on the MG response to a load being turned on and off when the IG operates connected to the MG
The MG consists in an MG leading inverter having on its DC side a supercapacitor-based energy storage system, two MG supporting inverters, and local loads
Summary
The renewable energy sources (RES) play a major role in electricity generation nowadays, operating along with energy storage systems (ESS) in autonomous microgrids (MGs) or as distributed generators (DGs) connected to the grid. A significant part of the available literature focuses on the MGs seamless transfer from autonomous to grid-connected mode and vice-versa Within this topic, the synchronization algorithms embedded in the control structure of the power converters that interface an MG or an RES-based DG with the main grid have been extensively analysed [3,4], relying mainly on Phase Locked Loop (PLL) methods. The MG can be connected to the grid, enabling bidirectional power flow, but in this case, the IG-DE unit is disconnected; it only synchronizes with the MG when the Energies 2017, 10, x FOR PEER REVIEW sustain the local loads Another similar approach is presented in [21], case in which a wind-driven latter operates in autonomous mode and the available renewable energy cannot sustain the local loads.
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