Page Content

1 Mask and Parameters
- 1.1 Configuration Tab
- 1.2 Current Controller Tab
- 1.3 Output Filter Tab
- 1.4 Islanding Detection Method Tab
2 Inputs, Outputs, and Signals Available for Monitoring
- 2.1 Inputs
- 2.2 Outputs
- 2.3 Description
- 2.4 Control System
- 2.5 Active Islanding Detection Methods
3 Limitations
4 References
5 Intellectual Property Disclaimer

The wave reference block generates the three-phase reference signal that drives the semiconductor bridge by regulating the real and imaginary components of the instantaneous currents (d and q) according to the input reference current Id and Iq. The wave reference block produces the three-phase reference signal used to drive the semiconductor bridge. This control is achieved by adjusting the real and imaginary components of the instantaneous currents (in the d and q coordinate frames) based on the input reference currents, Id and Iq. The output of the block can be configured to be a duty ratio or instantaneous voltage value. The block contains the current controller and also implements active islanding detection methods (IDM) conjointly with the protection system by modifying the reference current waveform.

Mask and Parameters

The Wave Reference block contains the following tabs in the configuration mask:

Configuration
Current Controller
Output Filter

Configuration Tab

Name	Description	Unit

Name	Description	Unit
Nominal Operating Voltage (Vrms LL)	Nominal Line-Line voltage of the grid	V
Rated Apparent Power (VA)	The inverter's capacity when expressed in per unit values.	VA
Rated DC Link Voltage (V)	The Rated voltage of the DC link when expressed in per unit values and is essential for the dynamic saturation of the current controller.	V
Output Signal Selection	Select the output reference signal: Inverter Voltage or Duty Ratio.	-
Islanding Detection Enabled?	Enable islanding detection (Yes/No)	-
Enable Momentary Cessation (VRTm = 2)	Activate the input for the VRTm signal. This signal is generated by the Voltage Protection block. When VRTm = 2, the internal current reference of the block becomes zero. The converter will still be connected and operating without injecting current.	-
Sample Time	Sample time for simulation of the component.	Sec

Current Controller Tab

Name	Description	Unit

Name	Description	Unit
Current Controller Type	Select the implementation type for the current controller: PI (Proportional Integral) or Custom Transfer Function.	-
PI Controller Proportional Gain	Proportional gain for the PI current controller, when used.	-
PI Controller Integral Gain	Integral gain for the PI current controller, when used.	-
Custom Controller Numerator Coefficients	The custom controller transfer function numerator polynomial coefficients, [an an-1 … a0], when used.	-
Custom Controller Denominator Coefficients	The custom controller transfer function denominator polynomial coefficients, [bn bn-1 … b0], when used.	-

Output Filter Tab

Name	Description	Unit

Name	Description	Unit
Output Filter Type	Select the inverter output filter type (L, LC, LCL)	-
Inverter Side Inductor	The value of the inductor corresponding to the inverter side	H
Internal Resistance of Inverter Side Inductor	The value of internal resistance corresponding to the inverter inductor	ohm
Grid Side Inductor	The value of the inductor corresponding to the grid side	H
Internal Resistance of Grid Side Inductor	The value of internal resistance corresponding to the grid side inductor	ohm

Islanding Detection Method Tab

This tab is activated when the islanding detection is enabled in the "Configuration" tab.

Name	Description	Unit

Name	Description	Unit
Islanding Detection Method	Select between General Electric (GE) schemes: none, GE Frequency, GE Voltage, GE Voltage+Frequency	-
GE Voltage Scheme Gain	Positive feedback gain in the d current component	-
GE Frequency Scheme Gain	Positive feedback gain in the q current component	-

Inputs, Outputs, and Signals Available for Monitoring

Inputs

Name	Description	Unit

Name	Description	Unit
Ip	Peak values of the per-phase current components representing the active power	pu
Iq	Peak values of the per-phase current components representing the reactive power	pu
Ig	Three-phase instantaneous current flowing into the grid	pu
Vdc	DC link voltage	pu
wt	Voltage phase angle of the grid	rad
Freq	Inverter output voltage frequency	Hz
Vg	Instantaneous three-phase grid voltages	pu
VRTm	Voltage ride-through input to enable momentary cessation (when VTRm = 2, the current reference is set to zero internally)	-
Reset	Signal used to reset the current controller. When Reset = 1, the controller is reset	-
Disable	Signal that controls the output of wave reference block. When Disable = 1, the outputs are forced to 0	-

Wave Reference (Three-phase)