The Woodruff School

SUMMARY

The electric vehicles (EV) market is growing rapidly. They are equipped with batteries able to store large amounts of energy and deliver it quickly with high power. However, most of the time these vehicles are parked at home or at work and their stored energy is unused. Photovoltaic energy is also spreading. More and more houses are equipped with solar panels to save on electricity bill and greenhouse gas emissions, as solar energy is cleaner than grid energy. Part of the solar generation system are stationary home energy storage (HES) units, which are also batteries with high capacity and able to deliver high powers.

In this thesis a model will be developed to evaluate the economic and environmental benefits from the combined use of an EV and a stationary HES. This model will be used to simulate an intuitive optimal battery storage management for a number of residential use scenarios. To be closer to a real situation, different parameters will be used to simulate these different cases like the environment (location, house load, solar generation…), the vehicle usage, the tariff grid chosen by the households, and their behavior related to the batteries management.

It was found that significant economic as well as some greenhouse gas emission savings can be achieved depending on the use case. The EV represents a big part of the electric consumption and its availability and usage impact greatly the savings. But in general, the possession of such system reduces the electric bill by 7% to 26% if the household already possessed an EV and up to 53% if the household did not possess an EV before. The emissions of the use of the simulated system are measurable and are over 2,000 kgCO2eq. The greenhouse gas emissions reduction between with and without the HES+EV system is hard to quantify as each household has different behaviors (grid usage, gas consumption, fuel consumption), but the results show potentially more than 70% reduction with the system.

SUBJECT:	M.S. Thesis Presentation

BY:	Guillaume Migeon

TIME:	Monday, July 8, 2019, 3:15 p.m.

PLACE:	MRDC Building, 4404

TITLE:	Evaluation of the Combination of an Electric Vehicle and a Repurposed Used Electric Vehicle Battery for a Residential Energy Storage System

COMMITTEE:	Dr. Bert Bras, Chair (ME) Dr. Andrei Fedorov (ME) Dr. Richard Simmons (SEI/ME)

SUMMARY The electric vehicles (EV) market is growing rapidly. They are equipped with batteries able to store large amounts of energy and deliver it quickly with high power. However, most of the time these vehicles are parked at home or at work and their stored energy is unused. Photovoltaic energy is also spreading. More and more houses are equipped with solar panels to save on electricity bill and greenhouse gas emissions, as solar energy is cleaner than grid energy. Part of the solar generation system are stationary home energy storage (HES) units, which are also batteries with high capacity and able to deliver high powers. In this thesis a model will be developed to evaluate the economic and environmental benefits from the combined use of an EV and a stationary HES. This model will be used to simulate an intuitive optimal battery storage management for a number of residential use scenarios. To be closer to a real situation, different parameters will be used to simulate these different cases like the environment (location, house load, solar generation…), the vehicle usage, the tariff grid chosen by the households, and their behavior related to the batteries management. It was found that significant economic as well as some greenhouse gas emission savings can be achieved depending on the use case. The EV represents a big part of the electric consumption and its availability and usage impact greatly the savings. But in general, the possession of such system reduces the electric bill by 7% to 26% if the household already possessed an EV and up to 53% if the household did not possess an EV before. The emissions of the use of the simulated system are measurable and are over 2,000 kgCO2eq. The greenhouse gas emissions reduction between with and without the HES+EV system is hard to quantify as each household has different behaviors (grid usage, gas consumption, fuel consumption), but the results show potentially more than 70% reduction with the system.