Symmetric Balancing Schedule

Controls a symmetric energy storage system in balancing mode. The control algorithm charges or discharges the battery in order to reach a given power target set-point at the grid connection point. If the target set-point is defined as zero, the behaviour is like with self-consumption optimization.

This controller allows two ways of controlling the power target set-point:

1. Definition of a power target set-point Schedule

The static configuration parameter "schedule" takes a Schedule of set-points as a Json-Array. An example schedule looks like this:

[
	{
		"startTimestamp": 1577836800,
		"duration": 900,
		"activePowerSetPoint": 0
	}, {
		"startTimestamp": 1577837700,
		"duration": 900,
		"activePowerSetPoint": -2000
	}
]

This schedule will activate a power target set-point of zero starting at the epoch time 1577836800 (i.e. seconds since 1st January 2020 00:00:00 in timezone UTC), that lasts for 900 seconds (i.e. 15 minutes). Afterwards - from 1577837700 - for another 900 seconds a set-point of -2000 W (i.e. feeding 2000 W to the grid) is targeted. After the second period passes, no more charging or discharging commands are set on the battery.

The schedule configuration parameter may be updated

Be aware that an UpdateComponentConfigRequest will always result in a actual configuration file being updated by Apache Felix Configuration Admin, so this command should not be used too frequently, e.g. only once per day. The SetGridConnScheduleRequest variant runs only in memory and is not persisted. Downside is, that if OpenEMS Edge gets restarted, the schedule is lost.

2. Immediate control of the power target set-point

The power target set-point may also be controlled directly via the GridActivePowerSetPoint channel. E.g. if the controller component has the Id ctrlBalancingSchedule0 one can use e.g. the REST-Api Controller and write

{
	"value": 5000
}

to the channel ctrlBalancingSchedule0/GridActivePowerSetPoint (e.g. ` http://x:user@localhost:8084/rest/channel/ctrlBalancingSchedule0/GridActivePowerSetPoint`), to set a temporary power target set-point of 5000.

Source Code