Introduction

Peak shaving

The peak shaving relay cascade is a special local control mode that is implemented to switch relays in specific order on or off for peak shaving. This works similar to a last-in-first-out (LIFO) queue.

• When the grid power drops below the switch-on threshold: The next relay that is currently off will be switched on
• When the grid power rises above the switch-off threshold: The last relay that is currently on will be switched off

This can be used to control the grid power to remain between the on and off thresholds, with on/off loads.

Order of the relays

The order of the relays is determined by:

1. The device priority (configureable on the device settings page)
2. For device of the same priority, devices are switched on in alphabetical order

Configuring the special control mode

Relay device settings

For each of the relays that are controlled, it is recommended to set the 'Use case' to 'Switching a device or circuit' in the device settings page. You should also set the 'Default device state' to whatever is desirable in case there is a problem with the control mode.

Enabling the special control mode

1. Go to the 'Settings' tab on the SmartgridOne Controller's interface and click 'Manage special local control modes'.
2. Click 'Start wizard' under 'Enable a new special local control mode'.
3. Choose 'Peak shaving relay cascade' and click 'Next'.
4. Set the grid power above which the last active relay is switched off, the grid power below which the next relay is switched on, and the minimum debounce time between switching relays. Leave sufficient room between the two thresholds to avoid relay chatter.
5. Select the relays and click 'Apply mode to selected devices'.

See Special local control modes for the priority towards other signals, and for pausing or removing the mode.