A modelica based object centric virtual power electronics laboratory l.jpg
This presentation is the property of its rightful owner.
Sponsored Links
1 / 22

A MODELICA-Based Object-Centric Virtual Power Electronics Laboratory PowerPoint PPT Presentation


  • 92 Views
  • Uploaded on
  • Presentation posted in: General

A MODELICA-Based Object-Centric Virtual Power Electronics Laboratory. Janhavi Agashe V.V.Sastry V.Ajjarapu S.S.Venkata. Dept. Of Electrical & Computer Engineering Iowa State University. Outline. Power Electronics Simulators Object-Oriented Modeling Language – Modelica

Download Presentation

A MODELICA-Based Object-Centric Virtual Power Electronics Laboratory

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


A modelica based object centric virtual power electronics laboratory l.jpg

A MODELICA-Based Object-Centric Virtual Power Electronics Laboratory

Janhavi Agashe

V.V.Sastry

V.Ajjarapu

S.S.Venkata

Dept. Of Electrical & Computer Engineering

Iowa State University


Outline l.jpg

Outline

  • Power Electronics Simulators

  • Object-Oriented Modeling Language – Modelica

  • Modeling of Components in Modelica

  • Various Models Developed

  • Simulation Results

  • Conclusions

North American Power Symposium 2002, Arizona State University, Tempe


Inter disciplinary nature of power electronics l.jpg

System Area

System &

Control theory

Modeling &

Simulation

High Power Area

Low Power Area

Analog Electronics

Circuit Theory

Signal Processing

Electric machines

Power

Electronics

Solid-State Physics

Power Systems

Digital Electronics

Electromagnetics

Inter-Disciplinary Nature of Power Electronics

Power Electronics

North American Power Symposium 2002, Arizona State University, Tempe


Power electronics simulators l.jpg

Power Electronics Simulators

  • A simulator for power electronic systems should

    • Haveevent handling capabilities.

    • Handle hybrid/ mixed-mode systems.

    • Support multi-domain modeling.

  • Widely used simulators: SABER, PSPICE, MATLAB/SIMULINK etc.

    • Lack of Object-oriented features

    • Closed modeling environment

North American Power Symposium 2002, Arizona State University, Tempe


Object oriented modeling language modelica l.jpg

Object-oriented Modeling Language - Modelica

  • Developed by the Modelica Association, Germany

  • Key Features

    • Object-oriented modeling language

      • Hierarchical structuring

      • Reuse

      • Effective in solving large and complex models

    • Open Modeling Environment

North American Power Symposium 2002, Arizona State University, Tempe


Object oriented modeling language modelica6 l.jpg

Object-oriented Modeling Language - Modelica

  • Additional Features

    • Acausal modeling

      • Ports are not committed to ‘input’ and ‘output’ early in the modeling/design process

      • Simpler models

      • More efficient simulation

    • Multi-domain

      • Electrical circuits, multi-body systems, drive trains, hydraulics, thermodynamic systems

North American Power Symposium 2002, Arizona State University, Tempe


Object oriented modeling language modelica7 l.jpg

Object-oriented Modeling Language – Modelica

  • Additional Features (contd.)

    • Several formalisms

      • ODE, DAE, bond graphs, finite state automata, state charts

    • Graphical user interfaces

      • Icons representing model components

      • Menu driven interface for modeling and simulation

    • Standardization effort

      • Group of internationally recognized and experienced researchers and companies worked for language and model development

North American Power Symposium 2002, Arizona State University, Tempe


Modeling of components in modelica l.jpg

Modeling of Components in Modelica

  • Model is derived as an extension of some base class using the “extends” statement

  • Required variables are declared

  • Necessary equations are defined in the “equation” section

  • The “annotation” section defines the graphical symbol i.e. icon for the model

  • The file is saved as “*.mo”

North American Power Symposium 2002, Arizona State University, Tempe


Modeling of components in modelica9 l.jpg

Modeling of Components in Modelica

North American Power Symposium 2002, Arizona State University, Tempe


Thyristor model in modelica l.jpg

Thyristor Model in Modelica

model Thyristor

constant Boolean DymolaCompatibility=true;

extends Modelica.Electrical.Analog.Interfaces.ThreePin;

Real Gate;

Real u;

Real GOp = 1.E-5;

Real RCl = 1.E-5;

Real i;

Boolean GATE;

Boolean Op(start=true);

equation

cont.v = Gate;

u = p.v-n.v;

i=p.i;

0=p.i+n.i;

GATE = if (Gate < 1.0) then false else true;

0 = if Op then i - GOp*(p.v - n.v) else (p.v - n.v) - RCl*i;

when (not (Op) and i < 0) or (Op and u > 0 and GATE) then

new(Op) = (not (Op) and i < 0) or (Op and not ((u > 0 and GATE)));

end when;

end Thyristor;

North American Power Symposium 2002, Arizona State University, Tempe


Models in the power electronics library l.jpg

Models in the Power Electronics Library

North American Power Symposium 2002, Arizona State University, Tempe


Architecture of simulator l.jpg

Architecture of Simulator

  • Front-end

    • Pre-processing tool that helps effective understanding and modeling

    • DYMODRAW

  • Simulation Engine

    • For conversion DAE’s into state space form and solving them symbolically or with efficient numerical techniques.

    • DYMOSIM. Any other simulator like ACSL, SIMULINK, etc. can also be used.

  • Post-processing tool

    • Visualization of dynamic behavior, 2-D or 3-D graphical view or animation.

    • DYMOVIEW

North American Power Symposium 2002, Arizona State University, Tempe


Architecture of simulator13 l.jpg

GraphicalFront-end

Object-oriented Modeling

Simulation Engine

Post-processing Tool

Architecture of Simulator

North American Power Symposium 2002, Arizona State University, Tempe


Step by step simulation procedure l.jpg

Step by Step Simulation Procedure

Single Thyristor

Switch Library

Various Libraries

North American Power Symposium 2002, Arizona State University, Tempe


Step by step simulation procedure15 l.jpg

Step by Step Simulation Procedure

Connection of components

Entire Circuit & its Translation

North American Power Symposium 2002, Arizona State University, Tempe


Step by step simulation procedure16 l.jpg

Step by Step Simulation Procedure

Simulation Control

Plot Window & Output Variables

North American Power Symposium 2002, Arizona State University, Tempe


Single phase bridge rectifier l.jpg

Single-Phase Bridge Rectifier

North American Power Symposium 2002, Arizona State University, Tempe


Single phase bridge rectifier18 l.jpg

Single-Phase Bridge Rectifier

Firing Angle = 45 degrees

Firing Angle = 30 degrees

North American Power Symposium 2002, Arizona State University, Tempe


Buck chopper l.jpg

Buck Chopper

iout

Vout

North American Power Symposium 2002, Arizona State University, Tempe


Buck chopper20 l.jpg

Buck Chopper

Duty Ratio = 0.75

North American Power Symposium 2002, Arizona State University, Tempe


Modelica based ee 452 laboratory experiments l.jpg

MODELICA Based EE 452 Laboratory Experiments

  • Single Phase Thyristor Rectifier

  • Three Phase Thyristor Rectifier

  • Buck Chopper

  • Boost Chopper

  • Single Phase Square-Wave Inverter

  • Three Phase Square-Wave Inverter

  • Chopper-fed DC Motor Drive

  • V/F control of Induction Motor

North American Power Symposium 2002, Arizona State University, Tempe


Conclusions l.jpg

Conclusions

  • Object-oriented modeling language enabled reuse of models, hierarchical structuring and easy maintenance of models

  • The power electronics library using MODELICA has been developed at Iowa State University

  • EE 452 experiments earlier written in DYMOLA have been designed around the new MODELICA library

North American Power Symposium 2002, Arizona State University, Tempe


  • Login