4-1

Chapter 4 Computer Simulation

4-2

System to be Simulated

• Challenges in modeling power electronic systems

4-3

Large-Signal System Simulation

• Simplest component models

4-4

Small-Signal Linearized Model for Controller Design

• System linearized around the steady-state point

4-5

Closed-Loop Operation: Large Disturbances

• Simplest component models

• Nonlinearities, Limits, etc. are included

4-6

Modeling of Switching Operation

• Detailed device models

• Just a few switching cycles are studied

4-7

Modeling of a Simple Converter

• Input voltage takes on two discrete values

4-8

Trapezoidal Method of Integration

• The area shown above represents the integral

4-9

A Simple Example

• The input voltage takes on two discrete values

4-10

Modeling using PSpice

• Schematic approach is far superior

4-11

PSpice-based Simulation

• Simulation results

4-12

Simulation using MATLAB

4-13

MATLAB-based Simulation

• Simulation results