Transcript FlexiPAC GREDOR Flexibility services from heat pumps

GREDOR
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FlexiPAC
Flexibility services from heat pumps
Des pompes à chaleur aux services de flexibilité
Moulin de Beez, 29/04/2015
Bertrand Cornélusse, Université de Liège
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Reminder from GREDOR operation
planning
We design decision making support tools for a Distribution System
Operator (e.g. ORES) who anticipates the operation of its system, e.g.
one day ahead, and uses some flexibility sources from the system to
avoid the curtailment of renewable generation.
The limits we consider are minimum and maximum voltages, and
maximum power rating of equipments.
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Ingredients of operational planning
Model of the medium
voltage network
Forecasts of generation
and consumption at buses
Parts of network
may be
aggregated
Flexibility services
E.g. load shifting
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Operational planning in action
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
The link between GREDOR and
FlexiPAC: flexibility services
Example flexibility
service:
“drop by with rebound”
The consumption of the
flexible loads can be
modulated. This
modulation is defined by
a modulation signal over
a certain time period.
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About flexibility services
To be usable by system operators or other actors, flexibility
services must be simple and well specified, and with a good
service level.
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Example
Power consumed by a device
(assuming baseline is zero)
Time
Many types:
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Raise by or to
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Drop by or to
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With or without
energy recuperation
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Several pricing
options
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etc.
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Heat pumps in the distribution system
Model of the medium
voltage network
HP
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HP
HP
HP
Flexibility services
E.g. load shifting
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
How to use the flexibility of one heat
pump?
HP
A simple procedure:
First, optimise the energy consumption of the HP as a function of the
electricity prices. This yields the base line consumption that will (should)
be followed by the HP regulation.
Then, compute the remaining flexibility around the consumption of the HP.
This flexibility can be sold to the DSO, or to other parties, as a flexibility
service.
Note that in theory the baseline computation and the reserve provision
computations should be optimised jointly, in order to reach a global
optimum.
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
From one house to a flexibility service
Imagine a single building with one heat
pump
How can we compute the maximum
affordable deviation from the base line,Power consumed by a device
(assuming baseline is zero)
upwards or downwards?
Is it function of the time of the day?
Will it imply a rebound or not? When?
What should be the price for providing
this service?
Tim
e
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
We have to solve many optimisation
problems to answer these questions
Maximize upwards margin
subject to building confort constraints
HP technical constraints
This problem is solved for every market period of the day, i.e. assuming the
service can be called at any moment. It is also solved in the downwards
direction.
The problem must be formulated over at least one day, accounting for the
initial temperature of the house, and for the side effects at the end of the
horizon considered. Ideally, uncertain weather conditions should be accounted
for.
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Maximum upwards modulation as a
function of time tau and recuperation
duration K (if any)
GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Aggregation of houses
HP
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HP
The problem can be enlarged to a
collection of houses on the same feeder
HP
HP
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables
Conclusion
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FlexiPAC is key for GREDOR to have a realistic view on
achievable flexibility services from heat pumps
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Heat pumps could also be used
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in the timeframe of real time control
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or more locally and in a distributed way, e.g. Premasol
project
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GREDOR - Gestion des Réseaux Electriques de Distribution Ouverts aux Renouvelables