Solar Lattice

Function

Scheduling of power values and modes

ID
func:scheduling
IRI
https://solarlattice.org/kb/func/scheduling
Status
active
Also known as
schedules, basic scheduling, Power scheduling
Category
Control
Function kind
control

Scheduling lets a device switch power values or operating modes at set times or over set intervals. In California, SCE Rule 21 requires smart inverter facilities to support scheduling with memory for at least 24 events. Each event changes setpoints for the volt/var, fixed power factor or volt/watt function. Under Rule 21, schedules can be held in a gateway or EMS, in the DER itself, or at an off-site aggregator. Each scheduled mode has a start time and a duration, and when it ends the inverter goes back to its defaults or takes the next commanded mode. On these SMA units you can upload schedules from a file under Configuration, Energy management, Schedules. An upload overwrites any schedules already stored. Power factor scheduling is one form of this function: the inverter's reactive power follows a schedule of inductive or capacitive power factor commands.

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Claims

response_time

c1 drafted · lead ≤ 10 MIN

Scope: regions California proposed; standard CA Rule 21 proposed

Conditions: Scheduling implemented at the gateway/EMS: time to pass the commands to the smart inverters after it receives the schedule, unless otherwise agreed

The GW/EMS shall communicate the necessary commands to the Smart Inverters within 10 minutes, or by mutual agreement
— SCE Rule 21 (effective Aug 29, 2023), Section Hh, Sheet 177. Quoted with attribution; the text remains the publisher's copyright.

c2 drafted · lead ≤ 15 MIN

Scope: regions California proposed; standard CA Rule 21 proposed

Conditions: Schedules stored at an aggregator that is not on the generating facility site: time to pass the commands to the smart inverter after it receives the schedule

The aggregator shall communicate the necessary commands to the Smart Inverter within 15 minutes of the aggregator receiving the scheduling information.
— SCE Rule 21 (effective Aug 29, 2023), Section Hh, Sheet 177. Quoted with attribution; the text remains the publisher's copyright.

Referenced by

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