3-Level NPC Arm

This block implements a single-phase (leg) 3-level DC to AC neutral point clamped (NPC) IGBT converter. It enables the LCA feature of eHS Gen4.

The Three-Level Bridge block implements a three-level power converter that consists of one or more arms of power switching devices. Each arm consists of four switching devices along with their antiparallel diodes and two neutral clamping diodes as shown in the figure below.

Parameters

Switch admittance (G_s)	The discrete-time switch conductance, in S.
Internal on resistance (R_on)	The diode internal on resistance, in ohms (Ω).
Internal off Resistance (R_off)	The diode internal off resistance, in ohms (Ω).
Gate control signal (g₁)	The signal to control on/off state of the first switch.
Gate control signal (g₂)	The signal to control on/off state of the second switch.
Gate control signal (g₃)	The signal to control on/off state of the third switch.
Gate control signal (g₄)	The signal to control on/off state of the fourth switch.
Prediction (Pred)	The prediction parameter of the switch. Values can range between 0.1 to 10. See How to tune two-level switches for detailed explanation.
Relaxation (Relax)	The relaxation parameter of the switch. Values can range between 0.1 to 10. See How to tune two-level switches for detailed explanation.

Electrical Ports

From top to bottom, the electrical ports are the positive, neutral port (left), AC port (right) and negative ports of the source respectively named p1, nc1, ac1 and n1

Inputs

g1	Digital input controlling the first gate. This input could be assigned to a digital input channel or a signal coming from Simulink or HYPERSIM.
g2	Digital input controlling the second gate. This input could be assigned to a digital input channel or a signal coming from Simulink or HYPERSIM.
g3	Digital input controlling the third gate. This input could be assigned to a digital input channel or a signal coming from Simulink or HYPERSIM.
g4	Digital input controlling the fourth gate. This input could be assigned to a digital input channel or a signal coming from Simulink or HYPERSIM.

Characteristics

Advanced - Gen 4

Advanced parameters for Gen 4 solver architecture:

Discrete-time switch conductance (G_s)

are only visible when selecting Nodal Analysis (Gen4) circuit analysis method in Solver Settings.

Precision on how to tune this parameter can be found here: How to tune discrete-time switch conductance.

Advanced - Gen 5

Advanced parameters for Gen 5 solver architecture:

Prediction (Pred)

Relaxation (Relax)

are only visible when selecting State-space Analysis (Gen5) circuit analysis method in Solver Settings.

Precision on how to tune those parameters can be found here: How to tune two- and three-level switches (Prediction and Relaxation).