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Papers by vima mali

2022 IEEE 19th India Council International Conference (INDICON)

2022 IEEE Global Conference on Computing, Power and Communication Technologies (GlobConPT)

IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society

ICTEA: International Conference on Thermal Engineering, May 7, 2019

Reliability is a key issue concerning supercapacitor for various applications including hybrid el... more Reliability is a key issue concerning supercapacitor for various applications including hybrid electrical energy storage system (EESS) of electric vehicles. In several power applications, supercapacitors are charged and discharged at high current which causes supercapacitors heating. The heating effect is a major concern under different temperature environments such as low temperature, room temperature and high temperature. In this article the effect of temperature on the working of supercapacitor to find their suitability as a component of hybrid EESS in electric vehicle application has been studied. Electrochemical impedance spectroscopic measurements have been performed on the commercial supercapacitor with respect to the variation in temperature. It is found that the temperature has a significant effect on the series resistance and capacitance of the supercapacitor. The increase in series resistance affects the utility of the supercapacitor due to increase in the I 2 Z losses.

2021 IEEE 2nd International Conference on Smart Technologies for Power, Energy and Control (STPEC), 2021

The dynamic wireless charging (DWC) system charges the vehicle battery while the vehicle is in mo... more The dynamic wireless charging (DWC) system charges the vehicle battery while the vehicle is in motion. It eliminates the problem of waiting time to charge the battery and helps in reducing the battery size. This work discusses the output power fluctuation in the DWC system due to a change in coupling coefficient between the magnetic coupler i.e. primary and secondary coils considering the compensation system. The work is started with an overview of the DWC system followed by an analysis of output power with respect to change in operating parameters i.e. coupling coefficient and load resistance. Furthermore, widely used compensation schemes such as series-series and Inductor(L)-Capacitor (C)-Capacitor (C)-Series (LCCS) compensations analysis are introduced to analyze the performance of the DWC system. The simulation studies are carried out through PLECS 3.7.5 and MATLAB 2020a software, and various results are presented. The comparative analysis between SS and LCCS compensations is presented considering the power transferred, output voltage, and efficiency, which confirms that SS compensation exhibits a high amount of power transferred while LCCS compensation is better in terms of power fluctuation.

Journal of Modern Power Systems and Clean Energy, 2022

Recent research findings indicate that the nonmonotonic consumption of energy from lithium-ion (L... more Recent research findings indicate that the nonmonotonic consumption of energy from lithium-ion (Li-ion) batteries results in a higher heat generation in electrical energy storage systems. During peak demands, a higher heat generation due to high discharging current increases the temperature from 80°C to 120°C, thereby resulting in thermal runaway. To address peak demands, an additional electrical energy storage component, namely supercapacitor (SC), is being investigated by various research groups. This paper provides insights into the capability of SCs in lightweight electric vehicles (EVs) to address peak demands using the worldwide harmonized light-duty driving test cycle (WLTC) driving profile in MATLAB/Simulink at different ambient temperatures. Simulation results indicate that temperature imposes a more prominent effect on Li-ion batteries compared with SCs under peak demand conditions. The effect of the discharging rate limit on the Li-ion battery current is studied. The result shows that SCs can accommodate the peak demands for a low discharging current limit on the battery, thereby reducing heat generation. Electrochemical impedance spectroscopy and cyclic voltammetry are performed on SCs to analyze their thermal performance at different temperatures ranging from 0°C to 75°C under different bias values of-0.6, 0, 0.6, and 1 V，respectively. The results indicate a higher specific capacitance of the SC at an optimum operation temperature of 25°C for the studied bias. This study shows that the hybrid combination of the Li-ion battery and SC for a lightweight EV can address peak demands by reducing thermal stress on the Li-ion battery and increasing the driving range.

Renewable and Sustainable Energy Reviews, 2021

Clean Technologies and Environmental Policy, 2020

A hybrid electrical energy storage system (EESS) consisting of supercapacitor (SC) in combination... more A hybrid electrical energy storage system (EESS) consisting of supercapacitor (SC) in combination with lithium-ion (Li-ion) battery has been studied through theoretical simulation and experiments to address thermal runaway in an electric vehicle. In theoretical simulation, the working temperature of Li-ion battery and SC has been varied from 0 to 75 °C in steps of 25 °C and the effect of the variation is observed on the output current, voltage and power of Li-ion battery and SC for a calculated load using the standard driving cycle. Further, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) have been performed to investigate the effect of temperature on SC. EIS measurements of SC indicate a low equivalent series resistance of 0.095 Ω at 25 °C. CV measurements indicate a high value of capacitance of 56.65 F/g at 25 °C for a scan rate of 5 mV s −1. Through theoretical simulation of EESS, a temperature increase (ΔT) of 0.41 °C is calculated considering an initial peak of 10-s duration for the case of EESS without SC, whereas the use of SC reduces ΔT to 0.025 °C. Further, optimal size calculation for hybrid EESS is done to achieve the least cost, wherein Li-ion battery capacity has been varied from 0 to 200 Ah and the SC capacity has been varied from 0 to 5 F in MATLAB simulation. The optimal combination is obtained as 30 Ah capacity of Li-ion battery and 3 F capacity of SC by connecting load across hybrid EESS for a duration of 3600 s.

2022 IEEE 19th India Council International Conference (INDICON)

2022 IEEE Global Conference on Computing, Power and Communication Technologies (GlobConPT)

IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society

ICTEA: International Conference on Thermal Engineering, May 7, 2019

Reliability is a key issue concerning supercapacitor for various applications including hybrid el... more Reliability is a key issue concerning supercapacitor for various applications including hybrid electrical energy storage system (EESS) of electric vehicles. In several power applications, supercapacitors are charged and discharged at high current which causes supercapacitors heating. The heating effect is a major concern under different temperature environments such as low temperature, room temperature and high temperature. In this article the effect of temperature on the working of supercapacitor to find their suitability as a component of hybrid EESS in electric vehicle application has been studied. Electrochemical impedance spectroscopic measurements have been performed on the commercial supercapacitor with respect to the variation in temperature. It is found that the temperature has a significant effect on the series resistance and capacitance of the supercapacitor. The increase in series resistance affects the utility of the supercapacitor due to increase in the I 2 Z losses.

2021 IEEE 2nd International Conference on Smart Technologies for Power, Energy and Control (STPEC), 2021

The dynamic wireless charging (DWC) system charges the vehicle battery while the vehicle is in mo... more The dynamic wireless charging (DWC) system charges the vehicle battery while the vehicle is in motion. It eliminates the problem of waiting time to charge the battery and helps in reducing the battery size. This work discusses the output power fluctuation in the DWC system due to a change in coupling coefficient between the magnetic coupler i.e. primary and secondary coils considering the compensation system. The work is started with an overview of the DWC system followed by an analysis of output power with respect to change in operating parameters i.e. coupling coefficient and load resistance. Furthermore, widely used compensation schemes such as series-series and Inductor(L)-Capacitor (C)-Capacitor (C)-Series (LCCS) compensations analysis are introduced to analyze the performance of the DWC system. The simulation studies are carried out through PLECS 3.7.5 and MATLAB 2020a software, and various results are presented. The comparative analysis between SS and LCCS compensations is presented considering the power transferred, output voltage, and efficiency, which confirms that SS compensation exhibits a high amount of power transferred while LCCS compensation is better in terms of power fluctuation.

Journal of Modern Power Systems and Clean Energy, 2022

Recent research findings indicate that the nonmonotonic consumption of energy from lithium-ion (L... more Recent research findings indicate that the nonmonotonic consumption of energy from lithium-ion (Li-ion) batteries results in a higher heat generation in electrical energy storage systems. During peak demands, a higher heat generation due to high discharging current increases the temperature from 80°C to 120°C, thereby resulting in thermal runaway. To address peak demands, an additional electrical energy storage component, namely supercapacitor (SC), is being investigated by various research groups. This paper provides insights into the capability of SCs in lightweight electric vehicles (EVs) to address peak demands using the worldwide harmonized light-duty driving test cycle (WLTC) driving profile in MATLAB/Simulink at different ambient temperatures. Simulation results indicate that temperature imposes a more prominent effect on Li-ion batteries compared with SCs under peak demand conditions. The effect of the discharging rate limit on the Li-ion battery current is studied. The result shows that SCs can accommodate the peak demands for a low discharging current limit on the battery, thereby reducing heat generation. Electrochemical impedance spectroscopy and cyclic voltammetry are performed on SCs to analyze their thermal performance at different temperatures ranging from 0°C to 75°C under different bias values of-0.6, 0, 0.6, and 1 V，respectively. The results indicate a higher specific capacitance of the SC at an optimum operation temperature of 25°C for the studied bias. This study shows that the hybrid combination of the Li-ion battery and SC for a lightweight EV can address peak demands by reducing thermal stress on the Li-ion battery and increasing the driving range.

Renewable and Sustainable Energy Reviews, 2021

Clean Technologies and Environmental Policy, 2020

A hybrid electrical energy storage system (EESS) consisting of supercapacitor (SC) in combination... more A hybrid electrical energy storage system (EESS) consisting of supercapacitor (SC) in combination with lithium-ion (Li-ion) battery has been studied through theoretical simulation and experiments to address thermal runaway in an electric vehicle. In theoretical simulation, the working temperature of Li-ion battery and SC has been varied from 0 to 75 °C in steps of 25 °C and the effect of the variation is observed on the output current, voltage and power of Li-ion battery and SC for a calculated load using the standard driving cycle. Further, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) have been performed to investigate the effect of temperature on SC. EIS measurements of SC indicate a low equivalent series resistance of 0.095 Ω at 25 °C. CV measurements indicate a high value of capacitance of 56.65 F/g at 25 °C for a scan rate of 5 mV s −1. Through theoretical simulation of EESS, a temperature increase (ΔT) of 0.41 °C is calculated considering an initial peak of 10-s duration for the case of EESS without SC, whereas the use of SC reduces ΔT to 0.025 °C. Further, optimal size calculation for hybrid EESS is done to achieve the least cost, wherein Li-ion battery capacity has been varied from 0 to 200 Ah and the SC capacity has been varied from 0 to 5 F in MATLAB simulation. The optimal combination is obtained as 30 Ah capacity of Li-ion battery and 3 F capacity of SC by connecting load across hybrid EESS for a duration of 3600 s.