1 Description
2 Mask and Parameters
3 Ports, Inputs, Outputs and Signals Available for Monitoring
4 References
5 See Also

Description

This component implements a switching function model of a modular multilevel converter (MMC) valve with half bridge submodules (HBSMs). The MMC consists of multiple HBSMs connected in series and an arm inductor. Different from the converter that is built with detail switches (MMC Valve (HB Cells)), the switching function model is modelled with two voltage sources and two diodes on the AC side and with two current sources on the DC side.

The converter is modelled with a switching function that can be driven by a PWM generator with (signals 0 or 1) or by a PWM averaging value (signals between 0 and 1). With PWM averaging method, the model can be as accurate as the detailed model and reduce the computation effort greatly, which could run in real-time simulation.

To appropriately simulate the blocked state (diode mode), the "Activate iterative method" must be enabled in the Simulation Settings.

Mask and Parameters

Name	Description		Unit	Variable = {Possible Values}

Name	Description	Unit	Variable = {Possible Values}
Number of submodules in valve - Narm	Number of submodules in valve	-	NbSM
Open state resistance - Ropen	IGBT Resistance when the switch is open	MΩ	Ropen
Closed state resistance - Rclose	IGBT Resistance when the switch is closed	Ω	Rclose
Snubber resistance - Rsnub	Snubber resistance	MΩ	Rsnub
Snubber capacitance - Csnub	Snubber capacitance	F	Csnub
Arm resistance - Rarm	Arm resistance	Ω	Rarm
Arm inductance - Larm	Arm inductance	H	Larm
DC storage capacitance - C	Capacitance of the submodule	F	C
Voltage source serial resistance - Rsrc	Resistance connected in series with the voltage source	Ω	Rsrc

Ports, Inputs, Outputs and Signals Available for Monitoring

Ports

Name	Description

Name	Description
+	Positive terminal of the valve
_	Negative terminal of the valve

Inputs

Name	Description

Name	Description
Discharge	Reset Capacitor voltages to 0 V
Nblk	Number of blocked SM
Non	Number of ON state SM

Outputs

Name	Description

Name	Description
Iarm	Arm current
Vc	Average capacitor voltage

Sensors

Name	Description	Unit

Name	Description	Unit
Icap	Capacitor current	A
Vsrc_p	Parallel voltage source (blocked SMs)	V
Vsrc_s	Serial voltage source (on SMs)	V

References

https://www.mathworks.com/help/physmod/sps/powersys/ref/halfbridgeconverter.html

HYPERSIM Documentation

MMC Valve (HB Cells, Avg)