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Use Case: AIT/Market-oriented control of storage and P2H

Description Of The Use Case

Name of use case

*Use case identification*
ID	*System configuration(s)*	*Name of use case*
UC6	SC AIT	Market oriented operation of conversion and storage appliances in hybrid thermal-electrical distribution system

Version management

*Version management*
*Version No.*	*Date*	*Author(s)*	*Changes*	*Approval status*
1.0	14.06.2017	B. Pesendorfer	First version	Draft

Scope and objectives of use case

*Scope and objectives of use case*
*Scope*	There is significant interest in taking advantage of the hitherto unused synergies by coupling different energy-carrier networks, such as district heating and electrical distribution networks. This could allow for significant savings in energy costs for both the thermal and the electrical side. To fully exploit the possible synergies, an energy management system has to schedule supply and demand of the coupling of the systems in a cost optimal way. This is especially challenging for networks with industrial loads and waste heat. This multi-energy management system (M-EMS) therefore manages the power flows between the electrical and thermal distribution networks (including industrial plants with waste heat if applicable). The two networks are coupled via power-to-heat technologies with additional storages, all operated by the multi-energy management system. The M-EMS receives information about energy market prices and sets the energy flows between the networks accordingly.
*Objective(s)*	O1: Minimize costs for electrical and thermal energy O2: Maximize revenue from generation of DERs
*Belongs to use case group (if applicable)*	Multi-energy management system

Narrative of use case

Narrative of use case

Short description

This use case describes a multi-energy management system (M-EMS) of a hybrid thermal-electrical distribution network. The electrical distribution system is thereby connected to the district heating network at one or multiple points where electricity can be converted to thermal energy via power-to-heat appliances. The operational goal is to minimize costs for electrical and thermal energy. To this end, the M-EMS derives and applies a cost optimal operational strategy for the conversion and storage devices within the hybrid network.

Complete description

The multi-energy distribution network management system manages power-to-heat conversion technologies and the electrical and thermal storage charging/discharging in a hybrid thermal-electrical distribution system. The objective is to coordinate among multiple DERs, power-to-heat devices, thermal storages, batteries and waste heat from industry to minimize the costs of energy consumption and maximize the profits by selling energy from DERs. To further outline the scope of this use case, the different energy domains and their role within this use case are described in the following.

Electrical side:

The M-EMS has access to advanced metering infrastructure monitoring all relevant costumers and DERs within the electrical distribution network. Moreover it is able to control and monitor predefined batteries and power-to-heat devices within the network. It receives and exchanges data with the energy market to derive a cost optimal operational strategy for these power-to-heat devices and batteries.

Thermal side:

The M-EMS has access to advanced metering infrastructure monitoring all relevant costumers and producers within the district heating network. Furthermore it also receives data about the status of the power-to-heat devices and thermal storages within the system and has full control of these appliances.

In case of industrial plants connected to the distribution networks, the M-EMS also supervises the in-feed from waste heat and has access to data of the industrial energy demands. The M-EMS also supervises the in-feed into the district heating network from industrial waste heat.

Based on this information the M-EMS operates the defined appliances and activates/deactivates energy flows from the electrical to the thermal distribution network. The storage and power-to-heat technologies are operated in such a way that energy is stored/converted in times of low energy prices and sold or used from storages in times of high energy prices, with respect to the electrical and thermal demands.

Optimality Criteria

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

*Optimality Criteria*
ID	*Name*	*Description*	*Reference to mentioned use case objectives*
C1	Efficient use of storages and power-to-heat	Achieve objectives with minimal costs for storage and power-to-heat technologies	O1, O2
C2	Electrical network stability	Constraints applicable for the electrical distribution network are met	O1, O2
C3	District heating network stability	Constraints applicable for the thermal distribution network are met	O1
C4	Wear minimization	Minimize wear of storage and power-to-heat technologies	O1, O2

Use case conditions

Use case conditions

Assumptions

The M-EMS has full access to the status of thermal and electrical storages, power flow through the power-to-heat devices and data of real-time energy prices.
Supply of DH network is guaranteed by other means and can also be met without infeed from power-to-heat or storage devices
Electrical distribution network is connected to external grid that guarantees supply in cases where demand is not met by local generation from DERs

Prerequisites

The M-EMS has means to monitor all relevant devices within the network as well as applicable energy prices and to control the energy producing, storing and consuming appliances.

General remarks

General remarks

Graphical RepresentationS Of Use Case

Graphical representation(s) of use case

Technical Details

Actors

*Actors*
*Grouping*		*Group description*
System
Device		Hardware-based device which physically implements a technical function
Component
Application		Software-based application or system
*Actor name*	*Actor type*	*Actor description*	*Further information specific to this use case*
Energy market	System	Marketplace for energy. Provides access to market information such as electricity prices.
Advanced metering infrastructure (AMI) for electrical distribution	Device	Advanced electric revenue meter capable of two-way communications. Measures, records, displays, and transmits data such as energy usage, generation, text messages, and event logs to authorized systems and provides other advanced utility functions
Advanced metering infrastructure (AMI) for district heating	Device	Advanced thermal revenue meter capable of two-way communications. Measures, records, displays, and transmits data such as energy usage, generation, text messages, and event logs to authorized systems and provides other advanced utility functions
Multi-energy management system (M-EMS)	Application	Application or system responsible for Network Operation. It receives real-time and forecast data from advanced metering infrastructure as well as from relevant energy markets and determines the optimal operation plan for defined appliances in the the electrical and thermal distribution network. It therefore coordinates thermal and electrical storages and power-to-heat devices.
Electrical storages/batteries	Component	Used to store electrical energy for a period of time.
Power-to-heat device(s)	Component	Converts electrical energy into thermal energy.
Thermal storage(s)	Component	Used to store thermal energy for a period of time.

Step By Step Analysis Of Use Case Optional

Overview of use case scenarios

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

*Scenario conditions*
*No.*	*Scenario name*	*Scenario description*	*Primary actor*	*Triggering event*	*Pre-condition*	*Post-condition*

Steps – Scenarios

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*