IEEE Electrification Magazine - March 2014 - 86
based on a tariff profile received one
day ahead via a broadband power
Wholesale
line used for communication with
Energy
Trade
Market
the dso. automatically switched
devices include dishwashers, washBalancing
BC 1, 5, 9
BC 2, 3, 4
Energy
Energy
ing machines, refrigerators, freezers,
Retailer
and clothes dryers (with a maximum
of two devices switched per customCommodity
er). in addition, other devices could
Subsystem
DG
Consumer/
Large Power
be started or stopped by the customTSO
Operator
Prosumer
Producer
Technical
er any time according to price incenSubsystem
tives by a simple click on the Web
interface. consumer interaction with
DSO
Physical
the energy butler and the communiEnergy Flow
BC 6, 7, 8
cation among all elements of the
smart house is presented in figure 4.
the energy management system
Figure 2. Mapping the business cases to the market participants.
tested in this field trial uses two main
shown in figure 3. this is compatible with the future
units together with supporting additional equipment:
smart grid vision as it is not expected that a single archi1) a smart meter to measure the electricity consumption
tecture will prevail but several heterogeneous approaches
digitally
will be applied. all of them will exchange information at a
2) the energy butler together with switchboxes to start/stop
higher level via common standardized approaches, such
connected household devices and primary equipment.
as those enabled by Web services.
in addition to these units, the energy management system comprises supporting technical infrastructure involvField Trials
ing many rather complex processes and equipment within
a single household. to keep high customer satisfaction and
Win-Win Situations: Trial in Manheim
considering interaction between various stakeholders-
between the customer and the local utility at Mannheim,
Trial Setup and Objectives
Germany, Mannheimer versorgungs- und verkehrsgesellthe main objective of the trial in Manheim is to test the
schaft energie aG (Mvv) energie between Mvv and the
automated response of household devices and the cusequipment developer, hardware manufacturer and other
tomers' behavior on variable electricity prices within a
third parties involved-a failure management system was
real utility environment. Participants are located in
introduced. the field trial installations were conducted in
Mannheim's ecologically oriented suburbs of Wallstadt
several phases, starting with a small group of households in
and feudenheim with a large number of customers actthe first phase and with further replication to a larger numing as consumers and photovoltaic (Pv)-based electricity
ber of the customers in the subsequent phase. the two
generators, i.e., prosumers. Part of the solution proposed
main phases were:
xx
elaboration and installation of the smart meters
by the field trial in Manheim is to integrate a demandaccording to suitability and price and their testing
side energy management system as an active part of the
afterwards
grid by offering incentives to use electric devices at specixx
testing and checking the functioning of the newly
fied times. this energy management system should be
developed hardware and software for the energy butler
flexible so that it can be extended by control functions for
energy management system, including briefing, trainelectricity generators, e.g., micro-chP in combination
ing, customer care, and installation teams, as well as
with thermal storage devices to allow electricity generaimplementation of a new billing procedure.
tion when needed, while also supplying heat or warm
four preferred tariffs were introduced for weekends
water when requested. therefore, decentralised energy
and working days with two different profiles for each of
management in households for balancing local consumpthem. each tariff profile used for the field trial had two
tion and local supply of electricity is investigated in
price levels: low and high tariff with a minimum duration
100 households.
of one hour. the tariff profiles were static, which means
the core of the energy management system used is a
that the same sequence (high and low tariff) applied for
newly developed device called the "energy butler."
every working day and every weekend day and holiday,
together with a broadband power line modem and
respectively.
peripheral additional modules (e.g., smart meter, data
the field trial measurements were implemented in
storage/data aggregator, and switchboxes), the energy
three phases adding step-by-step tariff incentives and
butler serves to optimize selected household appliances
86
I E E E E l e c t r i f i c ati o n M agaz ine / MARCH 2014
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