A NON-LINEAR CONTROL ALGORITHM FOR IMPROVING PERFORMANCE OF WIND GENERATOR USING DOUBLY-FED INDUCTION GENERATOR - PowerPoint PPT Presentation

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A NON-LINEAR CONTROL ALGORITHM FOR IMPROVING PERFORMANCE OF WIND GENERATOR USING DOUBLY-FED INDUCTION GENERATOR

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INSTITUTE OF ELECTRICAL POWER ENGINEERING Chair Electric Drives and Basics of Electrical Power Engineering A NON-LINEAR CONTROL ALGORITHM FOR IMPROVING PERFORMANCE OF ... – PowerPoint PPT presentation

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Title: A NON-LINEAR CONTROL ALGORITHM FOR IMPROVING PERFORMANCE OF WIND GENERATOR USING DOUBLY-FED INDUCTION GENERATOR


1
A NON-LINEAR CONTROL ALGORITHM FOR IMPROVING
PERFORMANCE OF WIND GENERATOR USING DOUBLY-FED
INDUCTION GENERATOR
INSTITUTE OF ELECTRICAL POWER ENGINEERING
Chair Electric Drives and Basics of Electrical
Power Engineering
  • M.Sc. Phung, Ngoc Lan
  • Athens, Feb/Mar.2006

2
Introduction
  • Conventional control of doubly fed induction
    machine (DFIM) in wind generator
  • Based on the continuous or discreet model of DFIM
  • Decoupling in active- and reactive power (PQ)
    control
  • A voltage dip what happened ?
  • A new control scheme !
  • Decoupling of PQ is guaranted
  • Better performance in dynamical operation mode
  • Non-linear control of DFIM with
    Exact-Linearization
  • Current model of DFIM is able to be exactly
    linearized !
  • A new current controller is with only P-Type
    controllers
  • The complete control structure is simple.
  • Decoupling is guaranteed - Direct-Decoupling

3
Contents
  1. DFIM Model and its characters.
  2. Conventional control of DFIM in wind generator
  3. Exact-Linearization Concept and
    implementation with DFIM
  4. Control structure with Direct-Decoupling
  5. Conclusion and prospects

4
Contents
  1. DFIM Model and its characters.
  2. Conventional control of DFIM in wind generator
  3. Exact-Linearization Concept and
    implementation with DFIM
  4. Control structure with Direct-Decoupling
  5. Conclusion and prospects

5
Control system of DFIM in wind generator
6
Demonstration of voltage-, flux- and current
vector in d-q coordinator
7
Electrical model of DFIM in d-q coordinator
8
Electrical model of DFIM in state-space
  • Rotor angular speed Input variable of
    the model
  • Model of DFIM in state-space shows a
    bilinear system

9
Contents
  1. DFIM Model and its characters.
  2. Conventional control of DFIM in wind generator
  3. Exact-Linearization Concept and implemetation
    with DFIM
  4. Control structure with Direct-Decoupling
  5. Conclusion and prospects

10
Control variables of the active- and reactive
power
The active power P and reactive power Q will be
separately controlled through ird and irq
11
A control structure of DFIM in wind generator
12
Contents
  1. DFIM Model and its characters.
  2. Conventional control of DFIM in wind generator
  3. Exact-Linearization Concept and
    implementation with DFIM
  4. Control structure with Direct-Decoupling
  5. Conclusion and prospects

13
Why do we apply Exact-Linearization ?
  • The nonlinear characters of DFIM
  • Performance of system in dynamical operation mode
    should be improved
  • Exact linearization guarantees not only the
    linearity between inputs and outputs but also the
    decoupling between each pair of input and output
    variable in the new model ---gt noninteracting
  • With the success of exact-linearization,
    different methods to design controllers for the
    new linear model could be applied.

14
Exact-Linearization the concept (1)
  • Given a nonlinear MIMO-System with m inputs and m
    outputs

15
Exact-Linearization the concept (2)
  • With a coordinator transformation
  • And with a state feedback controller
  • The new linear system will be

16
Exact-Linearization Implementation with DFIM
Considering three equations of DFIM
17
Exact-Linearization Implementation with DFIM
(1)
The model in state-space will be in form of
with
18
Exact-Linearization Implementation with DFIM
(2)
In the new state-space, system will be
In detail
19
Contents
  1. DFIM Model and its characters.
  2. Conventional control of DFIM in wind generator
  3. Exact-Linearization Concept and
    implementation with DFIM
  4. Control structure with Direct-Decoupling
  5. Conclusion and prospects

20
Structure of the new linear model
v
21
Control system of DFIM in wind generator with
direct-decoupling
22
Circuit diagram with Plecs
23
Performance of linearized model and current
controller
24
Simulation Grid voltage and electrical torque
Grid voltage
100
75
50
Torque Linear Control
Torque Nonlinear Control
25
Simulation Active and reactive power
P Linear Control
P Nonlinear Control
Q Linear Control
Q Nonlinear Control
26
Simulation Rotor current
ird Linear Control
ird Nonlinear Control
irq Linear Control
irq Nonlinear Control
27
Conclusion and perspectives
  • Control system of DFIM with exact-linearization
    practical and easy to implement.
  • Performance of system is improved with the static
    direct-decoupling current controller
  • The simulation with Matlab/Simulink/Plesc shows
    good results, the complete control system is
    being verified on experiment rig
  • Advanced methods can be used in design process of
    controllers

28
Thank you for your attention !
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