MATLAB : 04/25/21

How to Compute Switching Losses in Power System Thermal Network Inverter...

This example shows how to compute switching losses in a three-phase 3-level inverter, combining Specialized Power Systems and Simscape blocks.

01:45 Module 1_Calculation of Half Bridge IGBT with Loss

02:35 Module 2 & 3_Calculation of Half Bridge IGBT with Loss

05:22 Viewing Simulation outputs : Inverter's Switching Frequency, output power, Total losses & Junction Temperature @ IGBT Module 1

06:21 Additional Scopes: Calculation of Total Harmonic Distortion (THD % )

08:00 From t=0 sec to t=5 sec: the inverter outputs 372 kW (power factor = 0.85) using a switching frequency of 850 Hz. The converter total losses are 2.7 kW and the highest junction temperature (125 C) is observed on IGBT1 of Module 1 (or IGBT2 of Module 2). See Tj(Celsius) Scope block inside the Additional Scopes & Measurements block.

09:00 From t=5 sec to t=12 sec, the inverter outputs 210 kW (power factor = 0.85) using a switching frequency of 1850 Hz. The converter total losses are 2.7 kW and the highest junction temperature (125 C) is still observed on IGBT1 of Module 1.

The Phase-A leg is implemented using three Half-bridge IGBT with Loss Calculation blocks. Both switching and conduction losses are calculated and injected into a thermal network. The simulation illustrates the achievable output power versus switching frequency for the three-phase, 3-level inverter.

Click here to download the Simulink File:

https://drive.google.com/file/d/15pHC...

Modern Power Converters Modeling Techniques _ Using Matlab Simulink

This example shows the operation of several types of power electronics converters that can be simulated using one of four selectable modeling techniques.

Modeling Techniques Description

You can run this simulation using one of the following modeling techniques:

1. Switching Devices: Converters are modeled using standard SPS power switches and diodes controlled by firing pulses which are produced by the PWM generators.

2. Switching Function: Converters are modeled using a switching-function model controlled by firing pulses which are produced by the PWM generators.

3. Switching Function (PWM averaging): Converters are modeled using a switching-function model controlled by averaging the firing pulses produced by the PWM generators over a specified period.

4. Reference-Voltage (Uref or D-Controlled): Converters are modeled using a switching-function model directly controlled by the reference voltage (Uref) or the duty-cycle (D). PWM generators are not required.

Technique 1 is the most accurate modeling technique, while technique 4 yields to the fastest simulation. Techniques 2 and 3 are well-suited for real-time simulation.

Simulation

During the simulation, the DC variable load will vary from 125 kW to 350 kW at 5 Hz. At 0.5 s, the DC motor speed setpoint is changed from 1200 to 800 RPM. At 0.6 s, the STATCOM reference (Qref) is changed from -1 Mvar to +1.5 Mvar.

Run the simulation and observe the resulting signals on the various scopes. Select a different modeling technique and rerun the simulation, comparing results with previous runs.

Click Here to download the Simulink mOdel: https://drive.google.com/file/d/1MoJl...

Temperature Control in a Heat Exchanger Using Matlab Simulink

This example shows how to design feedback and feedforward compensators to regulate the temperature of a chemical reactor through a heat exchanger.

Interactive Simulation : To gain additional insight and interactively tune the feedforward and feedback gains, use the companion GUI and Simulink® model. Click Here to download the Simulink model:

https://drive.google.com/file/d/1MoJl...