CEI EN IEC 61968-5

ENGLISH

The scope of this part of IEC 61968 is the description of a set of functions that are needed for enterprise integration of DERMS functions. These exchanges are most likely between a DERMS and a DMS. However, since this is an enterprise integration standard which may leverage IEC 61968-100:2013 for application integration (using web services or JMS) or other loosely-coupled implementations, there are no technical limitations for systems with which a DERMS might exchange information. Also, it should be noted that a DERMS might communicate with individual DER using a variety of standards and protocols such as IEC 61850, IEEE 2030.5, Distribution Network Protocol (DNP), Sunspec Modbus, or perhaps Open Field Message Bus (OpenFMB). One role of the DERMS is to manage this disparity and complexity of communications on the behalf of the system operator. However, the communication to individual DER is out of scope of this standard. Readers are invited to look to those standards to understand communication to individual DERs' smart inverter.

The scope will be limited to the following use case categories:

• DER group creation – a mechanism to manage DER in aggregate

• DER group maintenance – a mechanism to add, remove, or modify the members and/or aggregated capabilities of a given group of DER

• DER group deletion – removing an entire group

• DER group status monitoring – a mechanism for quantifying or ascertaining the current capabilities and/or status of a group of DER

• DER group forecast – a mechanism for predicting the capabilities and/or status of a group of DER for a given time period in the future

• DER group dispatch – a mechanism for requesting that specified capabilities of a group of DER be dispatched to the grid

• DER group voltage ramp rate control – a mechanism for requesting that a DER group following a ramp rate curve

• DER group connect/disconnect – a mechanism to request that DER either isolate themselves, or reconnect to the grid as needed

To support use cases in the preceding categories, this document specifies the following data requirements (profiles) as shown in Table 1:

The profiles in the left column of Table 1 are the "base" DER profiles and appear in the Payload section of IEC 61968-100 compliant messages. Those in the right column of Table 1 are the "query" profiles that appear in the Request section of IEC 61968-100 compliant messages and are used to specify the query parameters when using the "get" CIM verb.

Additionally, this specification uses existing IEC 61968-9:2013, Application integration at electric utilities – System interfaces for distribution management – Part 9: Interfaces for meter reading and control profiles, as shown in Table 2, which are used for passing event information and for the DER group connect/disconnect use cases. There are no extensions made to these profiles, only the data specific to these use cases is passed.

In a departure from prior IEC 61968 standards, this document supports specification of both a "constrained" and an "unconstrained" version of each of the "base" profiles. The "constrained" versions have a greater number of non-optional data elements and are intended for use with the "create" and "created" CIM verbs. The "unconstrained" versions have all or almost all of the CIM elements defined as optional, which is required to support operations involving the "change", "changed", "delete", "deleted" and "get" CIM verbs.