Power management for PV-battery based hybrid microgrid using WBG devicesAlatawi, Khaled; Matin, Mohammad
doi: 10.1117/12.2531859pmid: N/A
In this paper, control and power management system of PV-Battery hybrid system in two modes of operations gridconnected mode and islanded mode is proposed and investigated. In this configuration power flow from PV is used as primary power source and battery is used as a storage system to deliver power to the loads and utility grid through DCDC converters and an inverter. Wide bandgap semiconductor devices with higher switching speeds and higher efficiencies such as silicon carbide (SiC), and Gallium Nitride (GaN) devices will become a critical component in building microgrids. So, the impact of using GaN based Inverter on energy efficiency and power quality needs to be investigated. The power management system balances the power flow of the system under any operating circumstances such as: load demand changes, switching between operating modes disturbance, or changes in irradiance or temperature for solar energy. Multiple case studies are simulated to verify the effectiveness of the system. The PV-Battery hybrid system and power management system are simulated in PSIM and MATLAB/Simulink platforms.
Design and analysis of an isolated bidirectional DC/DC converter with wide band-gap devices for a fuel cell vehicleEltief, Salah; Matin, Mohammad; Tifour, Benali
doi: 10.1117/12.2532074pmid: N/A
The objective of this paper is to design and simulate an isolated bidirectional DC/DC converter, which has been recently incorporated in a Fuel Cell Electric Vehicles (FCEV), to interface a battery with the (FCEV) system. In the (FCEV) with an energy storage such as a battery. The fuel cell is the principal source providing the most power required by the traction motor. The battery, as an additional source, assists the fuel cell to fed the traction motor because of the slow dynamics of the fuel cell system and it can store also the energy during braking phases, in this case the use of bidirectional DC/DC converter is necessary to manage the power flux between the battery and the other parts of the system. Moreover, wide band-gap devices (WBG) have been considered due to their obvious advantages and their superior characteristics in various aspects that lead to better operating performance.
Recurrent network based planning and management of PV based islanded microgridAlmadhor, Ahmad; Matin, M.; Gao, D.
doi: 10.1117/12.2532030pmid: N/A
Solar energy is an intermittent source and purely Photo-voltaic (PV) based, or PV and storage based microgrids require characterization and modelling of PV resources for an effective planning and effective operations. In this research work long-short term memory (LSTM) as a recurrent neural network model is created for forecasting the PV solar resources, in which can assist in quantifying PV generation in various time intervals (hourly, daily, weekly). PV based microgrids often experience expensive or inaccurate resources planning due to the lack of accurate forecasting tools. The proposed LSTM model is simulated based on a real-time basis and the results are analyzed for its impact on planning and operations, and compared with conventional models such as Support Vector Machines - Regression (SVR). Hence, this model can be integrated further with existing energy management (demand side) and monitoring systems to streamline microgrid operations in its entirety.
Towards high Voc, thin film, homojunction WS2 solar cells for energy harvesting applicationsNassiri Nazif, Koosha; Kumar, Aravindh; Moreira de Menezes, Maria Thereza; Saraswat, Krishna
doi: 10.1117/12.2533007pmid: N/A
Transition metal dichalcogenides (TMDs) are great candidates for thin film photovoltaic cells due to their high absorption coefficient. WS2, with a band gap of 1.57 eV, is specifically attractive for applications where high open-circuit voltage (Voc) is required. However, due to strong Fermi level pinning at the contacts, Voc is nearly zero if a standard metal contact scheme is used on intrinsic WS2. In this work, for the first time, we achieve a record high Voc of 335 mV by using AlOx and MoOx for n and p doping of WS2, respectively.
First-principles study of the single- and double-walled nanotubes of TiO2An, Jiao; Wanaguru, Prabath; Tan, Zhi; Peng, Yuting; Zhang, Qiming
doi: 10.1117/12.2531995pmid: N/A
The geometric and electronic properties of the TiO2 single- and double-walled nanotubes (SWNT and DWNT), constructed by rolling the hexagonal nanosheet along the armchair (n,n) and the zigzag (n,0) directions, have been investigated systematically using the methods based on the density functional theory. The SWNTs with size to n=20 have been modeled and studied. The strain energies of the SWNTs decrease monotonically as the radii of the nanotubes increase, regardless of the rolling direction. The band gaps of the SWNTs are increased with the increase of the n value, approaching that of the nanosheet. The stability of the DWNT in respect to their SWNT components is studied and the optimized distance between the walls has been determined. The band gap values of DWNTs are decreased significantly compared with that of SWNTs due to the offset of the bands of the two constitutive SWNTs. And the value of band gap is almost independent of the intershell distance. The band edges of nanotubes with respect to the redox potentials of water splitting are estimated. The band gaps of TiO2 nanotubes could cover the redox potentials of water splitting, by comparing the band gap position of the bulk anatase with respect to the redox potentials of water splitting.