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‌Annex C - DRED Communications‌

This guide has chosen to treat DRED as a DER EndDevice and utilise the existing DERControl function set and map AS/NZS 4755 DRM controls for appliance DRED to the DERControl properties used for BESS control.

The DRED EndDevice will be treated as a load that can be reduced by applying a DRM control percentage (as listed in Table C1 below).

The following is an outline for design of DRED Load Control:

1) Handle DRED as a DER EndDevice similar to BESS

2) Utilise the DERControl property to control DRED:

• opModFixedW – where the percentage is mapped to the AS/NZS 4755 DRM (refer to Table C.1)

3) No DefaultDERControl resource required. The failsafe command is assumed to be 100% (i.e. uncontrolled)

4) Utilise the DERCapability properties to be reported by the DRED EndDevice:

• modesSupported – ‘opModFixedW’ bit set

• DERType- utilise DeviceCategoryType bitmap on the associated EndDevice. For e.g. A/C use ’7 – Smart Appliance’, HWS ‘3 – Water Heater’, Pool Pump Controllers ‘4 – Pool Pump’, EV Charge Equipment - ’17 – Electric vehicle supply equipment (EVSE)’

5) Utilise the DERSettings property to be reported by the DRED EndDevice:

• modesEnabled – ‘opModFixedW’ bit set when control mode active

6) Utilise the DERStatus properties to be reported by the DRED EndDevice:

• alarmStatus – ‘0’

• operationalModeStatus – report current DRM in operation based on DRMs mapped to the following enumeration (as detailed in Table C.2). Where there is no DRM mode applied then the 'OperationalModeStatus' will be removed from the DER Status message.

• GenConnectStatus – report connection status for the DRED and used as a mechanism to report on device error. GenConnectStatus = ‘1’ when connected and ‘0’ when not connected.

Table C1 - DRED EndDevice reduced by applying a DRM control percentage

Table C2 – Operational Mode Status to report current DRM in operation based on DRMs mapped to the following enumeration operationalModeStatus

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