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Table of Contents
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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

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modelled with two voltage sources and two diodes on the

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AC side and with two current sources on the

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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

Image Modified

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

+

Positive terminal of the valve

_

Negative terminal of the valve

Inputs

Name

Description

Discharge

Reset Capacitor voltages to 0 V

Nblk

Number of blocked SM

Non

Number of ON state SM 

Outputs

Name

Description

Iarm

Arm current

Vc

Average capacitor voltage

Sensors

Name

Description

Unit

Icap

Capacitor current

A

Vsrc_p

Parallel voltage source (blocked SMs)

V

Vsrc_s

Serial voltage source (on SMs)

V

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Description

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References

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

See Also

MMC Valve (FB Cells)MMC Valve (HB Cells)