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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
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