VTB in Teaching Power Engineering Course

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VTB in Teaching Power Engineering
Course Wenzhong Gao and Noel Schulz
wgao_at_ece.msstate.edu, nschulz_at_engr.msstate.edu
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Outline

• Introduction
• 2. Course Scope
• 3. Lectures
• 4. Homework Assignments and Exams
• 5. Term Projects
• 6. Summary

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Introduction

• Need for power system modeling and simulation
• - system dynamics under disturbance
• - stability, operating limits, steady states,
  etc
• - virtual experiment, prototyping, and design,
  etc
• Objectives create models and simulate power
  system
• VTB used in the course due to these features
• - Physics-based dynamic models,
• - graphical user interface and visualization,
• - advanced programming,
• - user developed models (Application
  level?Modeler level),
• - symbolically assisted modeling and simulation
  (concentrate on
• getting the physics right, debug model
  equations instead of code),
• - VTB-Matlab co-simulation (controls).

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Course Syllabus
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Course Topical Outline

• Introduction
• Time-domain numerical techniques
• Resistive Companion Modeling methods for linear
  devices
• Resistive Companion Modeling methods for
  non-linear devices
• Modeling of power electronic converters
• Elimination of numerical oscillations in power
  electronic simulation
• Network matrix automation
• Solution of linear DC Circuit analysis
• Simulation of nonlinear circuits
• VTB architecture
• VTB customer model implementation (DLL model
  development
• via C coding)

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Lecture Example 1 Resistive Companion Modeling
z(t) g0(v,y,u,t)
i Through Variables - Dependent
Variables v Across Variables - External
States y Internal State Variables u Controls -
Independent z(t) Observation functions
Numerical Integration
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Lecture Example 1 Resistive Companion Modeling
Component Model

Connectivity Constraints
Newtons Method
x(t)
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Lecture Example 2 Power Electronic Converter
Modeling
D
L
0
2
0
2


Q OFF
vc
C
Q ON
Q
vc
C
_
_
1
1
1
1
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Lecture Example 2 Power Electronic Converter
Modeling

• Middlebrook State-space averaging model

• RCF model
• identify terminals
• identify through and across variables
• numerical integration
• get the RCF model i(t) G(h) v(t) b

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Lecture Example 3 Symbolical Modeling
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Homework Example 1
(1) Obtain the analytical solution of i. Plot the
analytical solution in Matlab and output
the data into a text file to be imported and
plotted in VXE.
(2) Build a single hierarchical model for the
combination of the R, L, C.
(3) Use UDD to build a model for the RLC.
(4) VTB-Simulink co-simulation Use Simulink to
build a model for the RLC and then interface it
with VTB to simulate the circuit.
(5) Use the VTB model development kit and develop
a Resistive Companion VTB native dll model for
the RLC (Visual C coding).
Compare the waveform of the current i from all
the above 5 cases.
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Homework Example 1
Analytical
VXE Plot
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Homework Example 1
Hirarchical
UDD Model
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Homework Example 1
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Homework Example 2

• Use three different numerical integration
  methods
• -- Trapezoidal,
• -- Gears 2nd order
• -- Backward Euler
• to develop Resistive Companion DLL models for the
  combination
• of an inductor and a resistor in series
• Compare these models by simulating a simple
  circuit

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Homework Example 3

• Simulate the dynamics and speed control of a DC
  motor fed from a buck converter
• There are two tasks
• - Model and simulate the whole system in VTB
  (using your own models)
• - Model the controller part of the system
  (enclosed in the dotted line) in Matlab
• while the rest of the system is still
  modeled in VTB (VTB-Matlab cosimulation).

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Exam Example 1
Derive the Resistive Companion Form model of
devices with 3 external terminals
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Exam Example 2
Set up the system matrices for solving a
nonlinear circuit using Resistive Companion
modeling technique.
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Term Project Topics

• Electric vehicle permanent magnet brushless DC
  machine-drive systems
• Electric vehicle switched reluctance AC
  machine-drive systems
• Active power filter modeling
• Power system generic load modeling
• Micro-turbine power system modeling and
  simulation
• High-voltage circuit breaker arc modeling
• Protective Relay System modeling and simulation
• Fault Protection system modeling
• Remotely distributed simulation
• Distributed Generation Example System Modeling
  and Simulation
• Basic requirements
• Develop at least one DLL RCF model in VTB
• Test your new model in a simple application
  system and reveal the
• fundamental principles of the associated
  system

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Term Project Example 1
Modeling and Simulation of Active Power Filter in
VTB
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Term Project Example 2
High-voltage circuit breaker arc modeling

• Present whenever two conductors are separated to
  interrupt a circuit current
• Self-sustained discharge having low voltage drop
  and able to support great
• amplitudes of current
• During circuit breakers operation the electric
  arc behaves as a nonlinear
• resistance (Mayrs Model)

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Term Project Example 3
Distributed Generation Example System Modeling
and Simulation (PV Battery Charging System)
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Term Project Example 4
Protective Relay Modeling and Simulation
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Summary and Discussions

• VTB is an effective teaching tool for power
  system Modeling and Simulation
• VTB-Matlab co-simulation is good for
  understanding power system control

• Add lecture for real-time simulation (in VTB)
• Add lecture for distributed simulation (in VTB)
• Develop experiment lab sessions to verify
  modeling and simulation (e.g. R-L-C circuit,
  power electronic converter, small-scale power
  system, etc)

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Acknowledgement

• Dr. Monti and Dr. Ponci (on-site VTB Workshop in
  Jan. 2005)
• Dr. Dougal and Dr. Solodovnik (general VTB
  questions)
• Students taking the class