The Islanded Control block is responsible for regulating the flow of the active and reactive power, when the microgrid is disconnected from an external AC-grid, known as Islanded mode, by allowing the user to adjust the active and reactive power settings.

Mask and Parameters

The Islanded Controller block contains the following configuration mask:

Name	Unit	Description
Frequency	Hz	Expected grid frequency even during islanded mode.
PCC dq-voltage threshold for Grid Connected transition	V	Maximum voltage threshold to close main grid break and leave islanded mode.
PCC dq-current threshold for Isalnded transition	A	Minimum current threshold to open main grid break and enter islanded mode.
Duration of below-threshold V/A for PCC switching	s	This is the duration where the condition must be met to enter or leave the islanded mode. To enter islanded mode, minimum current condition must be achieved for at least this duration. To leave islanded mode maximum voltage condition must be achieved for at least this duration.
Microgrid phase error frequency compensation	Rad/Hz	When the islanded microgrid and the grid are out of phase, this will modify the diesel generator frequency so both network can be synchronize before leaving the islanded mode.
Data Sampling time	s	Sampling rate at which the different condition are checked.
Sampling Time	s	Time step for the simulation.

Inputs, Outputs and Signals Available for Monitoring

Inputs

Name	Unit	Description
Grid P import	pu	Active power P commanded by dispatch.
Grid P ref	pu	Active power P commanded by user.
Grid P meas	pu	Active power P measured through the Point of Common Coupling (PCC).
Grid Q import	pu	Reactive power Q commanded by dispatch.
Grid Q ref	pu	Reactive power Q commanded by user.
Grid Q meas	pu	Reactive power Q measured through the Point of Common Coupling (PCC).
Infeed grid wt	radsec	wt of Infeed grid.
Infeed grid current meas	A	Current measurement of Infeed grid.
Infeed grid voltage meas	V	Voltage measurement of Infeed grid.
Microgrid voltage meas	V	Voltage measurement of microgrid.
Islanded enable	-	User island command (should be set to 1 when the microgrid needs to be set in islanded mode).
Microgrid angle error	-	Defference between microgrid and external grid angles.

Outputs

Name	Unit	Description
Grid P error	pu	Error between commanded and measured active power P.
Grid Q error	pu	Error between commanded and measured reactive power Q.
PCC current zero enable	-	PCC current is low enough to open PCC.
PCC current data	pu	PCC current statuses/data.
PCC voltage zero enable	-	Voltage difference across PCC low enough to close.
PCC voltage data	pu	PCC voltage statuses/data.
Islanded	-	microgrid is islanded.
DG w ref	rad	w reference for Diesel generator to compensate microgrid angle error.

Islanded controller

Mask and Parameters

Inputs, Outputs and Signals Available for Monitoring

Inputs

Outputs