Smart grid for electric vehicle fleet

Mar 05, 2014
Smart grid for electric vehicle fleet
Up to 30 electric vehicles at a time can recharge in Fraunhofer IAO’s parking garage. Credit: Victor S. Brigola / Fraunhofer IAO

Being able to charge up to 30 electric cars at once requires some ingenious energy management. Researchers are incorporating a mix of renewables into the design of a smart grid for Germany's largest charging station.

The network of charging stations for electric vehicles is becoming more tightly meshed. In Germany, the ratio of to charging stations is currently two to one and utility companies are pushing forward expansion of charging opportunities, especially in cities and metropolitan areas. Over 2000 charging spots have already been installed nationwide and the country's largest charging infrastructure is at the Fraunhofer Institute Center Stuttgart IZS – where up to 30 (EVs) at a time can re-charge at AC charge spots in the Fraunhofer Campus parking garage.

There is also one DC fast charging spot that has a charging capacity of up to 50 kilowatts and can fully charge a car's battery in just 20 minutes. Up to 340 kilowatts of electricity are consumed when all charging spots are occupied – equivalent to around 20 percent of the load of the entire Institute Center, which has a staff of 1500. "Charging an electric vehicle fleet poses high requirements on the energy system. Setting up an EV charging infrastructure of this kind is impossible without smart charging and load management," says Dipl.-Ing Hannes Rose, head of the Mobility Innovation Lab at the Fraunhofer Institute for Industrial Engineering IAO. Rose and his team are currently using their living lab to investigate the technology required to manage EV fleets. How do you maximize operational efficiency? How do you avoid short circuits occurring during peak load times? How do you design a smart grid that can meet all these requirements? Together with Daimler AG and the Institute for Human Factors and Technology Management at the University of Stuttgart, IAO scientists are developing both the charging infrastructure and the in a project called charge@work.

The aim of charge@work is to design a micro smart grid (MSG) capable of supplying the EV fleet with electricity produced exclusively from renewable sources. This year will see the installation of a photovoltaic unit and a small wind power system at the IZS to provide power to the fleet. In addition, a lithium-ion battery storage unit will be added to the basement and a redox flow battery to the roof as temporary storage of energy. The 30-meter-tall wind turbine is delivering 10 kilowatts. Since it operates on a vertical rather than a horizontal axis, it does not have to be oriented to wind direction. Its investment costs are low. The MSG can be run in island mode in parallel to the grid operated by the local energy provider. "If our batteries are emtpy, we can connect the MSG to the local grid," says Rose.

What is special about this MSG is that it is designed as a direct current (DC) grid. "Photovoltaic facilities and battery storage devices both use direct current. We settled on a DC design for our micro smart grid to avoid the losses that occur when transforming alternating current (AC) into DC," explains Rose. In addition to the energy management software, the IAO scientists are also setting up a simulation environment in which to lay out their MSG and play out various scenarios, such as different weather conditions.

Micro smart grids offer a more secure supply

Rose sees a host of advantages in decentralized power generation, but none more significant than being able to secure supply: "As Germany continues to move toward a new energy economy, increasing demand is being placed on the country's power grids. Wind and photovoltaic facilities generate electricity intermittently, which doesn't always match customer demand. The grid has to compensate for these fluctuations, increasing the risk of power outages. We can counteract this risk by establishing decentralized supplies of electricity and by optimizing the way we manage our energy. And doing so also serves to increase our independence from energy price trends by largely eliminating the need to import electricity."

In their living lab, the IAO scientists now plan to create a testing environment that will allow industrial companies, systems providers, public utility companies, communities and distributers to explore the potential of micro grids. Over the next two years, the Micro Smart Grid innovation network is to provide interested parties with an opportunity to work up new kinds of smart grid configurations and operating strategies. Using the Fraunhofer micro smart grid demonstrator, the project partners can test their hardware and software components. They can also investigate options for allowing other consumers to connect to the MSG – whether, for example, to run a building's air conditioning system or to integrate other production facilities. "Our long-term goal is to bring individual local grids together to form a large ," says Rose.

Explore further: Smart grids to help optimizing the utilization of power grids

add to favorites email to friend print save as pdf

Related Stories

Smart software for self-regulating smart grid

May 24, 2011

Siemens and the utility company Allgauer Uberlandwerk (AUW) in the city of Kempten, Germany, are testing the smart grids of the future. The tests focus on optimized power distribution and the use of a self-organizing ...

Silicon Valley sees shortage of EV charge stations

Jan 20, 2014

An increasing number of electric-vehicle driving employees at Silicon Valley companies are finding it hard to access car-charging stations at work, creating incidents of "charge rage" among drivers.

Energy to power tomorrow's electric vehicles

Sep 09, 2013

Sales of full electric and plug-in hybrid electric vehicles have been rising steadily in many parts of the world, including Europe. These are motor vehicles, including personal cars, which can be recharged ...

Recommended for you

Should the Japanese give nuclear power another chance?

Oct 24, 2014

On September 9, 2014, the Japan Times reported an increasing number of suicides coming from the survivors of the March 2011 disaster. In Minami Soma Hospital, which is located 23 km away from the power plant, ...

UK wind power share shows record rise

Oct 24, 2014

The United Kingdom wind power production has been enjoying an upward trajectory, and on Tuesday wind power achieved a significant energy production milestone, reported Brooks Hays for UPI. High winds from Hurricane Gonzalo were the force behind wind turbines outproducing nuclear power ...

Global boom in hydropower expected this decade

Oct 24, 2014

An unprecedented boom in hydropower dam construction is underway, primarily in developing countries and emerging economies. While this is expected to double the global electricity production from hydropower, it could reduce ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

Smarter Grid Solutions
not rated yet Mar 06, 2014
This looks an interesting project. We are working on a smart EV charging trial in the UK which is part of the the Low Carbon London project. Looking at how to monitor and manage the load from electric vehicles and alleviate grid congestion. More background on the 'Smarter Grid Solutions' and 'UK Power Networks Innovations' websites.