Use Cases

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The IES Austria project develops interoperability profiles for use cases in the energy systems domain. Developers can easily implement conformant solutions using these profiles. Go here to learn more about the details of the profiles and how they refer to IT standards.

 

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Use Cases

This section introduces the use cases that have been specified for the domain "virtual power plant" using the IEC 62559 Use Case Methodology. Information concerning the single use cases can be retrieved following the provided links or by downloading the profiles as html from the download area beneath.

VPP-00: Establish the VPP

The association of various DEUOPs to a VPP should be variable so that different kinds of business models can be fulfilled by a VPPOP if necessary. Therefore, the VPPOP has to define requirements which have to be fulfilled by the DEUOPs before the VPPOP can decide how the VPP is composed. After estabilishing the VPP, the VPPOP can start the general VPP operation cycle (creating forecasts, developing and sending schedules as well as adapting schedules). (link)

VPP-01: Create individual forecast for the VPP

The production and load forecast of a VPP for a particular region and time can be calculated with data from the Distributed Energy Unit Operator (DEUOP) and the VPP operator, up-to-date and historical data, like measurements, as well as with previous forecasts and data from weather services. Accurate forecasts are necessary for a successful balance of the energy production and load within the VPP and the electric power grid as well as a successful energy trade. For this purpose, forecasting systems should be used to calculate the individual forecast of a VPP. (link)

VPP-02: Exchange the VPP forecast with the DSO

For recognizing grid congestions, the VPPOP sends its individual forecast to the DSO to consider possible power grid requirements before the VPPOP participate on the Energy Exchange. Thus, the VPPOP can adapt its forecast regarding to the feedback of the DSO. This process helps to stabilize the electric power grid in an early stage. (link)

VPP-03: Participate on the Energy Exchange

The Energy Exchange regulates the energy trade between the power plant operators and consumer. In order to ensure the participant of small power plants, the VPPOP assumes the participation on the Energy Exchange. Threrefore, the VPPOP has to transmit an aggregated forecast to the Energy Exchange to get a day ahead schedule which is implemented by the DEUs of the VPP. (link)

VPP-04: Send schedule to the DEUOP

Controlling the energy production and load of DEUs is the main purpose of a VPP to participate on the energy market. Therefore, the VPPOP creates a forecast about its production and load and coordinates this with the energy exchange and the DSO. Based on this agreement, the VPP creates schedules which are transmitted to the DEUOP and trnasformed into single control signals by the DEUOP for the DEU controller. (link)

VPP-05: Send planned schedule to the DSO

For organizing the electric power system stability, the VPPOP sends the planned schedule to the DSO. The DSO uses the schedule to check the status of the power system for the day and can make adjustments if necessary. (link)

VPP-06: Send actual schedule to the VPPOP

The DEUOP sends the current state of its DEUs to the VPPOP by sending the actual schedule. This schedule represents the current capacity of the DEUs. In the normal case, the actual schedule is similar to the planned schedule; however, if failures in the electric power system occur, the DSO sends further control signals to the DEUCs which will be visible for the DEUOP and VPPOP by the actual schedule. (link)

VPP-07: Transmit adjustments on the planned schedule to the VPPOP

The DSO makes adjustments for the power production and load of the DEUs which are members of the VPP. These adjustments include data about the location (e.g. low tension thread, distance indicator or further factors), the desired performance and the priority (optional or mandatory) which have to be considered in the schedule for the DEUOPs. The VPPOP considers this data for optimizing the schedules of the DEUOPs. (link)

VPP-08: Renegotiate schedule on the Energy Exchange

Only if the VPPOP got adjustements from the DSO to adapt the planned schedule, the VPPOP has to renegotiate the schedule on the Energy Exchange. These adjustments describe the secondary control and is used before a critical state in the electric power system occurs. (link)

VPP-09: Provide measured values and meter data by the DEUC

The measured data which are collected within this use case by the DEUCs are the basis for creating the bill for the amount of electricity and the electric power grid usage. Additionally, these data support the verification of the agreed load, the voltage regulation and monitoring of the current electric power grid state as well as the state estimation of the power grid territory. Thus, DEUCs have to provide the measured values at a specific time interval which are stored and available for the DSO and VPPOP. (link)

VPP-10: Fix imbalances in the electric power system directly by the DSO

The DSO is responsible for the service reliability and the voltage quality of the electric power system. For this purpose, the DSO checks the status of the electric power system and the current status of the DEUs. In case of urgency, the DSO has the possibility to regulate the DEUs to guarantee the electric power system stability. (link)

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