The 2-Level Converter (Switching Devices) component is a three-phase power converter model developed from IGBT and diode elements. The converter is modeled with GTO/diode pairs controlled by firing pulses produced by a PWM generator. Normally used with time steps of 100 to 200 times smaller than the period of the carrier of the PWM generator, this component provides precise off-line simulation results.

NOTE: In order to obtain accurate results, the option Activate iterative method in Simulation Settings must be selected when using this component.

Mask and Parameters

Parameter Name	Description	Unit	Variable = {Possible Values}
Description	Use this field to add all kinds of information about the component		Description = {'string'}
Diode on-state resistance	Internal resistance of the internal GTO/diodes	Ohm	Rclose = { [1e-12, 1e12] }
Diode snubber resistance	Snubber resistance of the internal GTO/diodes	Ohm	Rsnubber = { [1e-12, 1e12] }
Diode snubber capacitance	Capacitance of the internal GTO/diodes	F	Csnubber = { [1e-12, 1e12] }

Ports, Inputs, Outputs and Signals Available for Monitoring

Ports

Name	Description
net_1	Network connector on the AC side (supports only 3-phase connections)
DCplus	Network connector on the DC side. The + sign indicates this is the positive end (supports only 1-phase connections)
DCminus	Network connector on the DC side. The - sign indicates this is the negative end (supports only 1-phase connections)

Inputs

Name	Description
P	Vectorized signal containing six firing pulses to control the converter.

Outputs

Name	Description
V	Vectorized voltage signal containing the phase-ground voltage of the AC side (Va, Vb and Vc) and the DC link (Vdc).
I	Vectorized current signal containing the phase-ground current of the AC side (Ia, Ib and Ic) and the current of the DC link (Idc).

Sensors

Name	Description	Unit
P1	Gating signal controlling Q1.
P2	Gating signal controlling Q2.
P3	Gating signal controlling Q3.
P4	Gating signal controlling Q4.
P5	Gating signal controlling Q5.
P6	Gating signal controlling Q6.
Va	Voltage signal of phase A from the AC side of the converter.	V
Vb	Voltage signal of phase B from the AC side of the converter.
Vc	Voltage signal of phase C from the AC side of the converter.
Vdc	Voltage signal from the DC link of the converter.
Ia	Current signal of phase A from the AC side.	A
Ib	Current signal of phase B from the AC side.
Ic	Current signal of phase C from the AC side.
Idc	Current signal of DC link.

Additional Information

The converter is modeled by 6 IGBT/diodes controlled by firing pulses produced by a PWM generator. The figure below shows the internal circuit of the 2-Level Converter (Switching Devices) using IGBT and diode elements.

The PWM generator outputs a vectorized gating signal to control the converter. The gating signal contains six firing pulses. The first two pulses control the Q1 and Q2 switching devices (phase A of the converter), pulses three and four control the Q3 and Q4 switching devices (phase B of the converter), and the last two pulses control the Q5 and Q6 switching devices (phase C of the converter).

Limitations

This component must be used with the PWM Generator for 2-Level Converter (Switching Devices) component available in the Control Sources library of HYPERSIM or with an input FPGA module (contact our technical support for an example).

This model does not participate in the load flow solution.

References

MathWorks, Two-Level Converter Mathworks.com. https://www.mathworks.com/help/physmod/sps/powersys/ref/twolevelconverter.html.

M. H. Rashid, Power electronics handbook, 4^th ed. Butterworth-Heinemann, 2017.

HYPERSIM Documentation

2-Level Converter (Switching Devices)