Currently there are only threephase PWM implemented (not multiphase).
Extends from Modelica.Icons.Package (Icon for standard packages).
| Name | Description |
|---|---|
IntersectivePWM | Intersective PWM |
PWM | PulseWidthModulation |
SVPWM | SpaceVector Pulse Width Modulation |
Let the user choose the PWM type from:
Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).
| Type | Name | Default | Description |
|---|---|---|---|
PWMType | pwmType | Modelica.Electrical.PowerConverters.Types.PWMType.SVPWM | PWM Type |
Frequency | f | Switching frequency | |
Time | startTime | 0 | Start time of PWM |
Real | uMax | Maximum amplitude of signal | |
ReferenceType | refType | Modelica.Electrical.PowerConverters.Types.ReferenceType.Triangle3 | Type of reference signal |
| Type | Name | Description |
|---|---|---|
input RealInput | u[2] | Reference space phasor |
output BooleanOutput | fire_p[m] | positive fire signal |
output BooleanOutput | fire_n[m] | negative fire signal |
For a threephase system, 8 space vectors are available according to the following switching patterns:
Vector 1..6 form a hexagon, vector 0 and 7 are of length 0.
First, the space vector is limited, and the sector of the hexagon is determined where the input space vector u is located; then the angle of the space vector within this sector 0≤φ<60° is calculated.
The input space vector is averaged by u = ta*ua + tb*ub + t0*0, where ua is the space vector at the left border of the sector and ub is the space vector at the right border of the sector. If necessary, a zero length vector is applied additionally.
The relative time spans for averaging over one switching period are determined by the following equations:
To obtain the positive fire signal, the switching time spans are distributed symmetrically: t0/4 + ta/2 + tb/2 +t0/2 + tb/2 + ta/2 + t0/4
The switching pattern of the negative fire signal is just the inverse of the positive fire signal.
Extends from Modelica.Blocks.Interfaces.DiscreteBlock (Base class of discrete control blocks).
| Type | Name | Default | Description |
|---|---|---|---|
Frequency | f | Switching frequency | |
final Time | samplePeriod | f ^ (-1) | Sample period of component |
Time | startTime | 0 | First sample time instant |
Real | uMax | Maximum length of space vector = half diagonal of hexagon |
| Type | Name | Description |
|---|---|---|
input RealInput | u[2] | Reference space phasor |
output BooleanOutput | fire_p[m] | positive fire signal |
output BooleanOutput | fire_n[m] | negative fire signal |
The intersective PWM transforms the input space phasor u to the three phase voltages, and compares them with the reference signals. As long as the phase voltage is greater than the corresponding reference signal, the corresponding fire signal is true. The switching pattern of the negative fire signal is just the inverse of the positive fire signal.
The user can choose from 4 different reference signals:
Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).
| Type | Name | Default | Description |
|---|---|---|---|
Frequency | f | Switching frequency | |
Time | startTime | 0 | Start time of PWM |
Real | uMax | Maximum amplitude of signal | |
ReferenceType | refType | Modelica.Electrical.PowerConverters.Types.ReferenceType.Triangle3 | Type of reference signal |
| Type | Name | Description |
|---|---|---|
input RealInput | u[2] | Reference space phasor |
output BooleanOutput | fire_p[m] | positive fire signal |
output BooleanOutput | fire_n[m] | negative fire signal |
Generated 2018-12-12 12:10:21 EST by MapleSim.