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MMC Valve (HB Cells, Avg)


This component implements a switching function model of 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 modeled with two voltage sources and two diodes on the ac side and with two current sources on the dc side. 


Mask and Parameters

NameDescriptionUnitVariable = {Possible Values}
Number of submodules in valve - NarmNumber of submodules in valve-

NbSM

Open state resistance - Ropen IGBT Resistance when the switch is openMΩRopen
Closed state resistance - RcloseIGBT Resistance when the switch is closedΩRclose
Snubber resistance - RsnubSnubber resistanceMΩRsnub
Snubber capacitance - CsnubSnubber capacitanceFCsnub
Arm resistance - Rarm Arm resistanceΩRarm
Arm inductance - Larm Arm inductanceHLarm
DC storage capacitance - CCapacitance of the submoduleFC
Voltage source serial resistance - RsrcResistance connected in series with the voltage sourceΩRsrc


Ports, Inputs, Outputs and Signals Available for Monitoring

Ports

NameDescription
+Positive terminal of the valve
_Negative terminal of the valve

Inputs

NameDescription
Discharge

Reset Capacitor voltages to 0 V

NblkNumber of blocked SM
NonNumber of ON state SM 

Outputs

NameDescription
IarmArm current
VcAverage capacitor voltage

Sensors

NameDescriptionUnit
IcapCapacitor currentA
Vsrc_pParallel voltage source (blocked SMs)V
Vsrc_s

Serial voltage source (on SMs)

V

Description

The converter is modeled with 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 detail model and reduce the computation effort greatly, which could run in real-time simulation.


References

See Also

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