Novel Power Smoothing Technique for a Hybrid AC-DC Microgrid Operating with Multiple Alternative Energy Sources

The power produced by renewable sources such as photovoltaic systems and wind energy conversion systems is highly intermittent due to continuously changing irradiance and wind velocity. When the distributed generation systems employing photovoltaic (PV) array and wind energy conversion system (WECS)...

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Bibliographic Details
Published inAdvances in Electrical and Computer Engineering Vol. 21; no. 2; pp. 99 - 106
Main Authors NEMPU, P. B., SABHAHIT, J. N., GAONKAR, D. N., RAO, V. S.
Format Journal Article
LanguageEnglish
Published Suceava Stefan cel Mare University of Suceava 01.05.2021
Subjects
Alternative energy sources
Arrays
Converters
Distributed generation
Energy conversion
Energy resources
Energy storage
Fuel cells
Hydrogen storage
Irradiance
Kalman filters
Mathematical models
microgrids
Photovoltaic cells
power smoothing
renewable energy sources
Renewable resources
Smoothing
Smoothing (Statistics)
Supercapacitors
Wavelet transforms
Wind power
Wind speed
United States
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Summary:The power produced by renewable sources such as photovoltaic systems and wind energy conversion systems is highly intermittent due to continuously changing irradiance and wind velocity. When the distributed generation systems employing photovoltaic (PV) array and wind energy conversion system (WECS) operate in grid-tied mode, the power fluctuations affect the power quality of the grid. In a hybrid AC-DC microgrid (HMG), the dynamics of DC and AC subgrids influence each other. This paper proposes a supercapacitor based novel power smoothing methodology for the HMG with PV array, WECS, fuel cell (FC) and electrolyzer (EL) based hydrogen storage system considering the power fluctuations in both subgrids. The power smoothing technique on the DC subgrid aims to facilitate instantaneous power balance. The Kalman filter (KF) based velocity smoothing (KFV) approach is developed for the WECS. The KFV technique is compared with the power smoothing techniques presented in the literature. The KFV method is found to be effective in computing the smooth power reference for the supercapacitor system. By incorporating the proposed power smoothing technique in the HMG, the stress on the interlinking converter (ILC) and utility grid are minimized and the power quality is enhanced. Index Terms-Kalman filters, microgrids, power smoothing, renewable energy sources, supercapacitors.
ISSN:1582-7445
1844-7600
DOI:10.4316/AECE.2021.02011