PWM Generator (Multilevel)

R2026b

Generate pulse width modulated signal or waveform for modular multilevel converters

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PWM Generator (Multilevel) block

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Libraries:
Simscape / Electrical / Control / Pulse Width Modulation

Description

The PWM Generator (Multilevel) block implements a pulse width modulation (PWM) generator for modular multilevel converters. The PWM technique controls power transfer from one electrical component to another by quickly switching between full power transfer and no power transfer.

The block calculates gate pulses for a modular, multilevel converter based on the number of power submodules and two converter topologies: half-bridge and full-bridge. You can specify the number of power submodules and the converter topology using the Number of power submodules and Converter topology parameters, respectively.

Ports

Input

ref — Reference signal

vector

Reference signal to calculate the PWM for each power submodule of the multilevel converter, specified as a vector.

Output

PWM — PWM signal

vector

Pulse width modulation signal for each submodule, returned as a vector.

If you set the Converter topology parameter to Half-bridge, the output is a vector specified as:

$$G=\left\{G1\_SM1,G2\_SM1,G1\_SM2,G2\_SM2,\dots ,G1\_SMN,G2\_SMN\right\}.$$

If you set the Converter topology parameter to Full-bridge, the output is a vector specified as:

$$G=\left\{G1\_SM1,G2\_SM1,G3\_SM1,G4\_SM1,G1\_SM2,G2\_SM2,G3\_SM2,G4\_SM2,\dots ,G1\_SMN,G2\_SMN,G3\_SMN,G4\_SMN\right\},$$

where Gi_SMj is the reference signal controlling the i-th gate of the j-th power submodule. i ranges from 1 to 2 in a half-bridge topology and from 1 to 4 in a full-bridge topology. j ranges from 1 to N, where N is the number of power submodules specified in the Number of power submodules parameter.

Data Types: single | double

Parameters

Converter topology — Modular multilevel converter topology

Half-bridge (default) | Full-bridge

Topology of the modular multilevel converter.

Number of power submodules — Number of modular multilevel submodules

1 (default) | positive scalar

Number of power submodules of the modular multilevel converter.

Timer period (s) — PWM period

0.001 (default) | positive scalar

PWM timer period. The Timer period (s) parameter is specified as $$\frac{1}{2f_{sw}}$$, where $$f_{sw}$$ is the switching frequency.

Sample time — Block sample time

5e-5 (default) | positive scalar

Sample time for the block. For continuous-time simulation, set to zero. For discrete-time simulation, to ensure adequate resolution in the generated signal, specify a positive value that is less than or equal to 10 * Tper, where T_per is the Timer period (s).

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"ee_sl_lib/Pulse Width Modulation/PWM Generator (Multilevel)"

Example: add_block("ee_sl_lib/Pulse Width Modulation/PWM Generator (Multilevel)","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2020b