Impact of Sampling in the Operation of Vehicle to Grid and Its Mitigation

2021

Preprint

Self Cite

Li-ion batteries are widely used in electric vehicles because of their promising characteristics that meet high specific power and energy density requirements. The only setback is the capacity fading due to degradation in Li-ion batteries. The rate of capacity fade in Li-ion batteries in EVs vary based on the charging rate, changes in internal cell temperature and external ambient temperature, and user driving patterns. Since the Li-ion battery is electrochemical, determining the actual cause of degradation at a particular instant and constraining the rate is a big challenge. Further, the causes are related to parameters which are chemical, electrical and mechanical. In this work, the causes of degradation are studied by analysing the variation of parameters for multiple charge types and rates at different ambient temperatures. The analysis leads to developing a new battery friendly charging scheme suitable to fast charge battery at different ambient temperatures appropriately and constrain battery degradation.

Section: Discussion and Outlookmentioning

confidence: 99%

An Insight into the Battery Degradation and a Proposal for a Battery Friendly Charging Technique

Sah

2021

Preprint

Self Cite

“…User requirements can be a fast, medium and slow charge. The grid conditions should also be incorporated to avoid the impact of uncoordinated charging, which leads to voltage imbalance and instability (38)(39)(40). The electric grid can be at peak load, off-peak load or normal condition.…”

Section: Discussion and Outlookmentioning

confidence: 99%

An Insight into the Battery Degradation for a Proposal of a Battery Friendly Charging Technique

Sah

2021

Preprint

Self Cite

Li-ion batteries are widely used in electric vehicles because of their promising characteristics that meet high specific power and energy density requirements. The only setback is the capacity fading due to degradation in Li-ion batteries. The rate of capacity fade in Li-ion batteries in EVs vary based on the charging rate, changes in internal cell temperature and external ambient temperature, and user driving patterns. Since the Li-ion battery is electrochemical, determining the actual cause of degradation at a particular instant and constraining the rate is a big challenge. Further, the causes are related to parameters which are chemical, electrical and mechanical. In this work, the causes of degradation are studied by analysing the variation of parameters for multiple charge types and rates at different ambient temperatures. The analysis leads to developing a new universal charging scheme suitable to fast charge battery at different ambient temperatures appropriately and constrain battery degradation.

“…The speed of data is transmitted every 10 s. These rates of data transmission are fast enough to ensure that latency in communication does not impact the working of the controller. These issues have also been investigated in [21]. The detailed schematic of TCC is given in Fig.…”

Section: Transportation Communication Centre (Tcc)mentioning

confidence: 99%

Analysis of the resilience of an electric‐based transportation system

Majumder

IET Electrical Systems in Transportation

2020

Self Cite

The increasing pollution due to vehicular emissions demands a quick review of the present transportation structure. Replacing the present transportation system with an electric-based public transportation system is a possible solution. This system will use high-capacity storage devices that will be placed at the bus stops to store energy from the electric grid and then charge the buses. The implementation of such a system will require a systematic energy flow between entities such as the grid, energy storage systems, and buses. This energy flow may get interrupted due to failures between the entities and thus cause failures in the system. The objective of this work is to investigate various failures that can occur and propose strategies to minimise the impact of the failures on the operation of the system. In order to achieve this objective, a simulation model of the transportation system is developed for the analysis of different issues, which exist in the system and the fuzzy logic controller has been designed to provide solutions to these issues. The results show that with the proper working of the controller it is possible to mitigate failures that are caused due to critical energy flow disruptions.