Observer-Based Power Management for Multi-Source Electric Vehicles Using Optimized Splitting Ratios

2018 ◽  
Author(s):  
Ahmed M. Ali ◽  
Dirk Söffker
Keyword(s):  
Power Conversion Efficiency ◽  
Real Time ◽  
Power Management ◽  
Conversion Efficiency ◽  
Electric Vehicles ◽  
Control Method ◽  
Power Conversion ◽  
Observer Design ◽  
Power Handling ◽  
Optimal Power

Optimal power management in real-time is a core technology of hybrid electric vehicles (HEVs). The online application of optimized power split ratios based on driver demand is a promising approach allowing near optimal power handling decisions in real-time. However, the fulfillment of exact power delivery (driveability) is an open challenge of this approach due to interpolation of driver’s demand to the optimized discrete solutions. Finding balanced power management that handles unscheduled loads and sustains required power conversion efficiency may significantly improve the experimental application of this approach. This work proposes an observer-based control method integrated to the power management system that ensures better driveability with minimal effect on power handling optimality. Modeling of traction system for observer design is based on a simplified brushless DC motor model. Identification of system parameters is achieved by a newly introduced error minimization algorithm using NSGA-II to obtain the same dynamic response as the original system. Results analysis shows 7% reduction of power consumption and 98% improvement of driveability at minimal mitigation of power conversion efficiency.

Bipyridine type Co-complexes as hole-transporting material dopants in perovskite solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17354-17359 ◽  
Author(s):  
Jiajiu Ye ◽  
Li Zhou ◽  
Liangzheng Zhu ◽  
Xuhui Zhang ◽  
Zhipeng Shao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Cobalt Complexes ◽  
Optimal Power ◽  
Hole Transporting ◽  
Hole Transporting Material

This work focuses on preparing a series of substituted bipyridine cobalt complexes as HTM dopants using a co-solvent of dichloroethane and acetylacetone as the HTM solvent, achieving an optimal power conversion efficiency of 14.91%.

scholarly journals DC Voltage Sensorless Predictive Control of a High-Efficiency PFC Single-Phase Rectifier Based on the Versatile Buck-Boost Converter

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5107
Author(s):  
Catalina González-Castaño ◽  
Carlos Restrepo ◽  
Fredy Sanz ◽  
Andrii Chub ◽  
Roberto Giral
Keyword(s):  
Power Conversion Efficiency ◽  
Real Time ◽  
Conversion Efficiency ◽  
Output Voltage ◽  
Single Phase ◽  
Power Conversion ◽  
Input Voltage ◽  
Boost Converter ◽  
Boost Converters ◽  
Grid Voltage

Many electronic power distribution systems have strong needs for highly efficient AC-DC conversion that can be satisfied by using a buck-boost converter at the core of the power factor correction (PFC) stage. These converters can regulate the input voltage in a wide range with reduced efforts compared to other solutions. As a result, buck-boost converters could potentially improve the efficiency in applications requiring DC voltages lower than the peak grid voltage. This paper compares SEPIC, noninverting, and versatile buck-boost converters as PFC single-phase rectifiers. The converters are designed for an output voltage of 200 V and an rms input voltage of 220 V at 3.2 kW. The PFC uses an inner discrete-time predictive current control loop with an output voltage regulator based on a sensorless strategy. A PLECS thermal simulation is performed to obtain the power conversion efficiency results for the buck-boost converters considered. Thermal simulations show that the versatile buck-boost (VBB) converter, currently unexplored for this application, can provide higher power conversion efficiency than SEPIC and non-inverting buck-boost converters. Finally, a hardware-in-the-loop (HIL) real-time simulation for the VBB converter is performed using a PLECS RT Box 1 device. At the same time, the proposed controller is built and then flashed to a low-cost digital signal controller (DSC), which corresponds to the Texas Instruments LAUNCHXL-F28069M evaluation board. The HIL real-time results verify the correctness of the theoretical analysis and the effectiveness of the proposed architecture to operate with high power conversion efficiency and to regulate the DC output voltage without sensing it while the sinusoidal input current is perfectly in-phase with the grid voltage.

scholarly journals Optimation of Layers Thickness Design of Perovskite Solar Cell (PSC) Using GPVDM Simulation

2019 ◽  
Vol 2 (2) ◽  
pp. 56
Author(s):  
Dita Puspita
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Perovskite Solar Cell ◽  
Optimal Power ◽  
The Ideal

In this research, perovskite solar cells by configuring ITO/PEDOT:PSS/CH3NH3PbI3/ZnO/Al changed to optimize their performance. Modifications are made by varying the thickness of each layer to increase the ideal thickness with an optimal power conversion efficiency (PCE) value. This research used GPVDM software to study several power conversion efficiency (PCE) parameters of ITO/PEDOT:PSS/CH3NH3PbI3/ZnO/Al solar cells. The results of the study show that the power conversion efficiency (PCE) can be increased by adjusting the thickness of the coating, in this study the ideal thickness with the highest power conversion efficiency 25.75% in 1x10-8 m of ITO, 1x10-6 m of PEDOT:PSS, 4x10-7 m of CH3NH3PbI3, 1x10-8 m of ZnO and 1x10-9 m of Al.

Pyrrole: an additive for improving the efficiency and stability of perovskite solar cells

2019 ◽  
Vol 7 (19) ◽  
pp. 11764-11770 ◽  
Author(s):  
Xuping Liu ◽  
Jihuai Wu ◽  
Qiyao Guo ◽  
Yuqian Yang ◽  
Hui Luo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Perovskite Solar Cell ◽  
Optimal Power

A perovskite solar cell with pyrrole doping achieves an optimal power conversion efficiency of 20.07%.

scholarly journals Design and Experimental Verification of 400-WClass LED Driver with Cooperative Control Method for Two-Parallel Connected DC/DC Converters

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2237 ◽  
Author(s):  
Tomoharu Yada ◽  
Yuta Katamoto ◽  
Hiroaki Yamada ◽  
Toshihiko Tanaka ◽  
Masayuki Okamoto ◽  
...  
Keyword(s):  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Experimental Verification ◽  
Control Strategy ◽  
Cooperative Control ◽  
Control Method ◽  
Power Conversion ◽  
Switching Frequency ◽  
Frequency Method ◽  
Led Driver

This paper deals with a design and experimental verification of 400-W class light-emitting diode (LED) driver with cooperative control method for two-parallel connected DC/DC converters. In the cooperative control method, one DC/DC converter is selected to supply the output current for the LED, based on the reference value of the LED current. Thus, the proposed cooperative-control strategy achieves wide dimming range operation. The discontinuous current conduction mode (DCM) operation improves the total harmonic distortion (THD) value on the AC side of the LED driver. The standard of Electrical Applications and Materials Safety Act in Japan has defined the flicker frequency and minimum optical output. The smoothing capacitors are designed by considering the power flow and LED current ripple for satisfying the standard. A prototype LED driver is constructed and tested. Experimental results demonstrate that a wide dimming operation range from 1 to 100% is achieved with a THD value less than 10% on the AC side, by the proposed control strategy. The authors compare the power conversion efficiency between Si- and SiC-metal-oxide-semiconductor field-effect transistors (MOSFETs) based LED driver. The maximum power conversion efficiency by using SiC-MOSFETs based LED driver is 91.4%. Finally, the variable switching frequency method is proposed for improving the power conversion efficiency for a low LED current region.

Two-dimensional triphenylene cored hole-transporting materials for efficient perovskite solar cells

2020 ◽  
Vol 56 (12) ◽  
pp. 1879-1882 ◽  
Author(s):  
Wangchao Chen ◽  
Hanyu Zhang ◽  
Haofeng Zheng ◽  
Haitao Li ◽  
Fuling Guo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Two Dimensional ◽  
Optimal Power ◽  
Hole Transporting ◽  
Hole Transporting Materials

A PSC based on a two-dimensional triphenylene-cored HTM is unveiled that shows an optimal power conversion efficiency (PCE) of 19.4%.

A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽  
2019 ◽  
Vol 11 (45) ◽  
pp. 21824-21833 ◽  
Author(s):  
Jyoti V. Patil ◽  
Sawanta S. Mali ◽  
Chang Kook Hong
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Inorganic Perovskite ◽  
Halide Perovskite ◽  
Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

The Effect of Donor Molecular Structure on Power Conversion Efficiency of Small-Molecule-Based Organic Solar Cells

2019 ◽  
Vol 16 (3) ◽  
pp. 236-243 ◽  
Author(s):  
Hui Zhang ◽  
Yibing Ma ◽  
Youyi Sun ◽  
Jialei Liu ◽  
Yaqing Liu ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Molecular Design ◽  
Power Conversion ◽  
The Relationship

In this review, small-molecule donors for application in organic solar cells reported in the last three years are highlighted. Especially, the effect of donor molecular structure on power conversion efficiency of organic solar cells is reported in detail. Furthermore, the mechanism is proposed and discussed for explaining the relationship between structure and power conversion efficiency. These results and discussions draw some rules for rational donor molecular design, which is very important for further improving the power conversion efficiency of organic solar cells based on the small-molecule donor.

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