ICCP/TASE.2 used for Power System Communication
between domestic TSO & DSO & OpenADR 2.0 Standard
- VPP(Virtual Power Plant) is a kind of SW power plant that enables participation in system operation through integrated management of individual DER(Distributed Energy Resource)
- To operate a VPP with a single power generation system, ICCP/TASE.2(Inter-control Center Communication Protocol / Telecontrol Application Service Element) used for power system communication between domestic TSO(Transmission System Operator) and DSO(Distributed System Operator) standards and OpenADR 2.0 standard, which is a DER management technology protocol should be combined.
- There is a need to construct a communication model architecture that uses the upper power system and lower distributed resources as a common information model.
- ESS (the basic form of DER) is composed of a TASE.2 SBO(Select-Before-Operate) device, and related objects are mapped to OpenADR 2.0 reports and event services and designed as a single sequence type.
- Key Feature
- The EMS(Energy Management System) of the KPX(Korea Power Exchange) is exchanging system information in real-time with the Korea electric a power station SCADA(Supervisory Control and Data Acquisition) system using the IEC 61870-6 TASE.2 international standard.
- In order to operate VPP as a single Power generation system in terms of power system, It is necessary to collect power information by applying communication technology of other systems such as SCADA, EMS, DAS, etc., and it is necessary interoperability in terms of integrated management.
- The VPP system is located between DER and TSO in terms of communication, cans be viewed as an Adapter object that mediates upstream and downstream communication.
- Developed and operated a Utility-specific interlocking adapter that applied TASE.2 standard for upstream communication and OpenADR 2.0 standard for downstream communication.
- By defining and constructing independently operated GRID and DER as a common information model based on international standards, interoperability with other systems operated by existing power systems enables efficient DER management.
- Data Specifications
- TASE.2 uses MMS(Manufacturing Messaging Specification) ISO 9506 standard, the server acts as an ‘Action’, the client acts as an ‘Operation’, and 10 objects are used to model the power system, and each object is mapped to an MMS object.
- OpenADR 2.0 is an application-level data model for exchanging information on DRR(Demand Response Resources), exchanging information in the form of RESTful(Representational State Transfer) architecture and XML(eXtensible Mark-up Language).
- VPP as a single power center in the future energy market, Small VPPs such as HEMS, BEMS, and CEMS are integrated and evolved to interact horizontally by utilizing the complementarity of loads such as FEMS.
- Through 3 communication actors, it figures TASE.2 communication with Grid actor centered on Adapter actor, and OpenADR 2.0 message communication method with DER / DR actor.
- Adapter actors connect individual actors through a pacing end-point.
- TASE.2 server can be composed of SBO(Select-Before-Operator) and Direct(non-SBO).
- Adapter is designed to operate as SBO model, that is divided by IDLE or ARMED status value to select the device through the Select operation only for IDLE.
- After selecting the device, the status value is changed to ARMED to perform limited operation based on the TAG value.
- Through the OpenADR 2.0 oadrCreateReport and oadrUpdateReport messages, the Adapter stores the ESS metering information, and the TSO periodically receives the ESS information stored through the read service.
- According to the result of the received report, when a specific device control is required the TSO initiates data communication to the adapter through the TASE.2 write service and transmits the control signal.
- The receiving adapter converts signal into an OpenADR 2.0 oadrDistributeEvent message and sends a control signal to each ESS, and the ESS sends an oadrCreatedEvent message to notify the TASE.2 Client of the end of the message.
<Fig.1 OADR-TASE.2 Adapter communication architecture>
<TASE.2 and OpenADR2.0 communication actor>
<SBO device select operation flowchart>
<ESS report sequence diagram>
<ESS control sequence diagram>