Simplified Modeling and HIL Validation of Solar PVs and Storage-Based Islanded Microgrid With Generation Uncertainties

In microgrid (MG) modeling, the renewable energy sources (RESs) are mostly represented by the detailed small-signal modeling (SSM) of its interfacing inverter. In these models, the input dc-bus link voltage is assumed to be constant. However, due to generation intermittency of RESs, viz., solar phot...

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Bibliographic Details
Published in:IEEE systems journal 2020-06, Vol.14 (2), p.2653-2664
Main Authors: Sen, Sachidananda, Kumar, Vishal
Format: Article
Language:English
Subjects:
Analytical models
Batteries
Computational modeling
Computer architecture
Computer simulation
Data buses
Distributed generation
Frequency analysis
Frequency domain analysis
Inverters
Load modeling
Low voltage
Microgrid (MG) modeling
Microgrids
Microprocessors
Modelling
Photovoltaic cells
power electronics interfacing (PEI)
Reduced order models
Renewable energy sources
renewable energy sources (RESs)
small-signal model (SSM)
Stability analysis
System of systems
Uncertainty
Wind turbines
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Summary:In microgrid (MG) modeling, the renewable energy sources (RESs) are mostly represented by the detailed small-signal modeling (SSM) of its interfacing inverter. In these models, the input dc-bus link voltage is assumed to be constant. However, due to generation intermittency of RESs, viz., solar photovoltaics (PV) or wind turbines, this assumption is not appropriate. Also, the effects of storage devices are ignored. Now, this detailed SSM of inverters alongside loads and network gives a system of systems architecture to the MGs, modeling of which leads to a higher-order system with a large number of states. In this work, the SSM of a standard MG system is developed using simplified lower-order models of solar PVs and batteries that incorporate generation uncertainties by considering the dynamics of both input dc and output ac terminals of the inverter. The obtained reduced order model is computationally more efficient. The MG test system includes two PV sources having dedicated parallel RLC loads and low voltage feeder. The proposed model is validated by performing comprehensive time and frequency domain analysis for transient and steady-state operations by MATLAB based simulations and hardware-in-loop tests using the real-time digital simulator (RTDS) and dSPACE processor board.
ISSN:1932-8184
1937-9234
DOI:10.1109/JSYST.2019.2917754