Description Of The Use Case

Graphical RepresentationS Of Use Case

Technical Details

Step By Step Analysis Of Use Case Optional

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Asset Publisher

Name of use case

Version management

Scope and objectives of use case

Narrative of use case

Optimality Criteria

Use case conditions

General remarks

Actors

Overview of use case scenarios

Steps – Scenarios

Use Case: EDF/Maximize use of local resources

Use case identification

System configuration(s)

Name of use case

UC12

[List of system configurations which this UC can be applied to]

[start with verb expressing key action]

Collective self-supply with self-sufficiency objectives

*Version management*
*Version No.*	*Date*	*Author(s)*	*Changes*	*Approval status*
[X.Y]	[DD/MM/YYYY]	[List of names]	[Difference to previous version]	[Draft, Work in progress, Review, Final]
1.0	05/07/2017	TA. Nguyen D. Fehrenbach		Work in progress

*Scope and objectives of use case*
*Scope*	The energy challenges have become topics of increased attention and debates in the society: decline of fossil resources, rise of awareness regarding the environmental impact and demand for improved security of supply. The supply of energy from local resources is a promising element of response to the issues at stake. Amongst others, the energy harvesting and distribution at district scale (in particular from renewable and waste) could lower the CO₂-eq impact and the losses in the networks. This use case studies the potential of local energy supply with a centralized management of the distributed energy resources and the scattered energy infrastructures (power-to-heat, storage). Such an interconnected system enables synergies and optimal conversion between energy carriers (electrical and thermal). Consumers in the district have independent profiles of energy demand to be met. Pooling the uses enhances the exchanges and the collective energy balances, thus potentially increasing the share of the energy supply locally produced. The objective is to work towards a local energy network more self-sufficient. The system under discussion includes: the local (renewable and waste) energy resources, the exogenous energy resources (always available), the equipments for energy conversion and energy storage, and the networks for energy distribution. The use case studies the articulation of the system’s elements but does not focus on the ICT domain (centralized device for energy management, control panel and user interface to operators, control signals etc.).
*Objective(s)*	[identify specific objectives] O1: Maximize the energy supply from local resources (renewable and waste) with a centralized use and management of the energy infrastructures.
*Belongs to use case group (if applicable)*	[Specify an arbitrary group name here in order to link multiple related UCs together] District Energy Management

Narrative of use case

Short description

The local consumers have their own independent profiles of energy demand (electrical, heating and cooling). The centralized energy operator orients the energy flows from the different energy resources and through the equipments to meet the demands. All resources and equipments are controlled as a whole to optimize the collective energy management.

Complete description

[More verbose description; include for example details about control domain, requirements towards input signals or applicable system operating modes (normal, emergency, …) ]

The demand profiles should be met within a band of acceptable energy gap.
The management of the equipments have to comply with the technical constraints (maximum number of on/off cycles, minimum load etc.)
The economics of the systems will be investigated

(Directly associated with objectives. E.g. by what metric to 'minimise' something)

*Optimality Criteria*
ID	*Name*	*Description*	*Reference to mentioned use case objectives*
C1	Energy met	Minimize magnitude and duration of deviation between energy demand and energy distributed	O1
C2	Primary Energy Efficiency	Achieve objectives with minimal primary energy use	O1
C3	Economical optimum	Minimize costs	O1

Use case conditions

Assumptions

[Assumption; assumed relation to other systems: e.g. higher level controller sends a signal]

All the elements of the system (eg. heat exchangers, pumps, boilers etc.) can be operated with the decisions coming from a centralized center
The system and consumers are treated as one entity (as opposed to for ex. agent-based modelling appproaches)

Prerequisites

[Triggering Event (update of control signal or disturbance ...)]

Depends on SC

General remarks

[everything which doesn't fit in any of the other categories]

…

Graphical representation(s) of use case

Examples of typical diagram types associated with use cases:

a) UML Use case diagram

b) UML Sequence diagram(s)

*Actors*
*Grouping*		*Group description*



*Actor name*	*Actor type*	*Actor description*	*Further information specific to this use case*
Occupant	Human	Occupants of the district
Energy carriers	Energy flows	Carrier for electricity, heating and cooling
Equipments	System	The technical equipments to convert the energy from one form to the other. Equipment to store that energy.

Identify all relevant use case scenarios; rel. e.g. to Sequence Diagram or Use Case diagram

Scenario conditions

Scenario name

Scenario description

Primary actor

Triggering event

Pre-condition

Post-condition

Alternative / complementary to sequence diagrams.

*Scenario*
*Scenario name :*
*Step No.*	*Event*	*Name of process/ activity*	*Description of process/ activity*	*Service*	*Information producer (actor)*	*Information receiver (actor)*	*Information exchanged (IDs)*	*Requirements R-ID*