Storage and Simulation
General information and introduction
This is the documentation of a session block at the Micro Perspectives for Decentralized Energy Supply 2013, International Conference, Feb. 27 - Mar. 1, 2013
In cooperation with:
NEK, Sustainable Energy Concepts
University of Paderborn
Session facilitator:
Yassin Bouyraaman, University of Paderborn
Sessions
Ali Ameli: Frequency Control Applying Plug-in Electric Vehicles Based on Costumer Behavior in Electric Power Networks and Micro-Grids
Presentation
The main idea was the to include the psychological aspects of the customers using Electric Vehicles (EVs) in Electric Power Networks and Microgrids. The EVs can be charged when electricity is available and can give it back in case it is needed by the grid while the vehicle is connected. The use profile of the custumers must be taken into account in order to provide a system that will be used properly.
For the study, three categories were formed: P+R (charge at home), P+C (charge at public stations), public or sharing (no own car).
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Questions and discussion
Q: What about the voltage issue? Can the voltage be controlled by this approach, too?
A: Interesting aspect, but not discussed in this paper.
Q: Why do we need this type of frequency control? Why do the governers not bring back the frequency to 50 Hz?
A: There is primary frequency control by the plants which can just produce more steam in order to control the frequency but it takes time. The EVs are used as secondary frequency control. It is much faster.
Q: The night chargers need their energy during the day. How can they provide energy for the grid?
A: Example: The battery of the car is fully charged over night. The customer drives to work and connects the car. The grid can use as much energy as it needs as long as the car battery has enough energy left for the way back after work. A smart grid would have advantages when using this system. The incentive for the costumers is the money they get by selling energy to the grid. This is confirmed by the research study which has been the base for the simulation.
Busso von Bismark: A holistic implementation strategy for storage systems in renewable mini-grids
Presentation
A holistic integration of minigrids is needed. Autarsys GmbH is a new company focussing on lithium-ion-based Energy Storage Systems for mini-grids in the range of 100 to 1000 kW.
The advantages of lithium-ion batteries is the long lifetime of 15 years, Depth of Discharge (DoD) of 80%. The disadvantage of the high investment cost is reduced in future. Within 7 years the price can drop to 250€/kWh.
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Questions and discussion
Q: How big is the temperature effect that it is worth cooling down the system with a fan?
A: A 10% higher temperature can halve the lifetime.
Q: At what scale it is worth to use fans to cool down?
A: If there are 40°C outside, it is worth it! But of course, insulation and specific conditions are important.
Q: Isn't it contraproductive to consume energy using a fan to cool the system which produces energy?
A: Yes but the lifetime is important, too. Insulation and thermal mass also help to keep it cool.
Q: How big are the AC systems?
A: Containers of 20 feet, 1kW inverters, 150kWh storage system.
Q: Voltage of the containers?
A: usually 900V but it depends on the system.
Dimitry Gershenson: Driving Rural Energy Storage: A Second Look at the Second-Life of EV Batteries
Presentation
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Questions and discussion
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Final discussion
Q:
A:
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