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A Low Cost Dynamic Voltage Stabilization Scheme for Standalone Wind Induction Generator System

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... Voltage Stabilization Scheme for Standalone Wind Induction Generator System ... A sample test standalone wind induction generator system (WECS) is modeled using ... – PowerPoint PPT presentation

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Title: A Low Cost Dynamic Voltage Stabilization Scheme for Standalone Wind Induction Generator System


1
A Low Cost Dynamic Voltage Stabilization Scheme
for Standalone Wind Induction Generator System
  • By Dr.A.M.Sharaf, Senior member IEEE
  • and Liang Zhao, Student

2
Outline
  • 1.Introduction
  • 2.Standalone Wind Energy System
  • 3.Dynamic Series Switched Capacitor Compensation
    including two parts Digital Simulation Models
    and Dynamic Simulation Results
  • 4.Conclusions
  • 5.Future Study
  • Reference

3
1. Introduction
  • Wind energy has become one of the most
    significant, alternative energy resources.
  • Most wind turbines(15-200kw) use the three phase
    asynchronous induction generator for its low
    lost, reliable and less maintenance.
  • However, the voltage stability of a wind driven
    induction generator system is fully dependent on
    wind gusting conditions and electrical load
    changes1-3.
  • New interface technology is needed such as DSSC
    and other compensation scheme 1-3.

4
Introduction What is DSSC?
  • DSSC is a low cost dynamic series switched
    capacitor (DSSC) interface compensation scheme.
  • Capacitance in parallel or series of the DSSC
    scheme are interfaced with the output feeder
    lines.
  • DSSC scheme can be used to improve the induction
    generator voltage stability and ensure dynamic
    voltage stabilization under varying wind and load
    conditions, thus prevent loss of severe generator
    bus voltage excursions.

5
2. Standalone Wind Energy System
Figure 1 shows Standalone Wind Energy Conversion
Scheme Diagram with Hybrid Load and Dynamic
Series Switched Capacitor Compensations
6
2. Standalone Wind Energy System
Figure 2 shows Low Cost Dynamic Series Switched
Capacitor (DSSC) Stabilization Scheme using Gate
Turn off GTO switching Device
7
2. Standalone Wind Energy System
Figure 3 shows the Hybrid Electrical Load
8
3. Dynamic Series Switched Capacitor
Compensation 3.1 Digital Simulation Models
  • A sample test standalone wind induction generator
    system (WECS) is modeled using the Matlab/
    Simulink/ SimPower Blockset software environment.

9
3. Dynamic Series Switched Capacitor
Compensation 3.1 Digital Simulation Models
Figure 4 shows the Unified Systems
Matlab/Simulink Functional Model
10
3. Dynamic Series Switched Capacitor
Compensation 3.1 Digital Simulation Models
Figure 5 shows Tri-loop Error Driven PID
Controlled PWM Switching Scheme
11
3. Dynamic Series Switched Capacitor
Compensation 3.2 Dynamic Simulation Results
  • Linear and non-linear load excursions
  • Figure 6 in next slide depicts the digital
    simulation dynamic response to both in linear and
    nonlinear load excursion.
  • From time interval 0.1s to 0.3s, we applied 50
    (100kVA) linear load from 0.4s-0.6s, we applied
    60 (120kVA) non-linear load.
  • So the DSSC can stabilize for both linear and
    nonlinear load excursions and ensure the
    generator bus stabilization

12
3. Dynamic Series Switched Capacitor
Compensation 3.2 Dynamic Simulation Results
  • Without DSSC Compensation
  • With DSSC Compensation

Figure 6
13
3. Dynamic Series Switched Capacitor
Compensation 3.2 Dynamic Simulation Results
  • Under inrush induction motor load excursion
  • Figure 7 in the next slide shows the dynamic
    simulation response to the induction motor load
    excursions.
  • From time 0.2s to0.4s, we applied about 20
    (20kVA) induction motor load.
  • From the figure we can see that DSSC did not
    compensate for this inrush motor load excursions
    adequately.

14
3. Dynamic Series Switched Capacitor
Compensation 3.2 Dynamic Simulation Results
  • Without DSSC Compensation
  • With DSSC Compensation

Figure 7
15
3. Dynamic Series Switched Capacitor
Compensation 3.2 Dynamic Simulation Results
  • Under wind excursion
  • Figure 8 in the next slide shows the dynamic
    simulation response to wind excursions
  • From 0.3s-0.6s, the wind speed was decreased to
    6m/s from initial value 10m/s.
  • From figure 8 we can see that DSSC did compensate
    wind excursion, the voltage at generate bus keeps
    1.0pu.

16
3. Dynamic Series Switched Capacitor
Compensation 3.2 Dynamic Simulation Results
  • Without DSSC Compensation
  • With DSSC Compensation

Figure 8
17
4. Conclusions
  • The low cost DSSC compensation scheme is very
    effective for the voltage stabilization under
    linear, non-liner passive load excursions as well
    as wind speed excursions
  • But it can not compensate adequately for large
    inrush dynamic excursions such as induction
    motor.
  • The proposed low cost DSSC voltage compensation
    scheme is only suitable for isolated wind energy
    conversion systems feeding linear and non-linear
    passive type loads

18
5. Future Study
  • Another new compensation scheme that can
    compensate for a large inrush induction motor
    excursion will be studied in my future research.
  • That scheme will be very effective for bus
    voltage stabilization under linear, non-liner,
    inrush motor load excursions and wind excursions.

19
Reference
  • 1. K.Natarajan, A.M Sharaf, S.Sivakumarand and
    S.Nagnarhan, Modeling and Control Design for
    Wind Energy Conversion Scheme using Self-Excited
    Induction Generator, IEEE Trans. On E.C., Vol.2,
    pp.506-512, Sept.1987.
  • 2. S.P.Singh, Bhim Singh and M.P.Jain,
    Performance Characteristic and Optimum
    Utilization of a Cage Machine as a Capacitor
    excited Induction Generator, IEEE Trans. On
    E.C., Vol. 5, No.4, pp.679-685, Dec.1990
  • 3. A.Gastli, M.akherraz, M. Gammal,
    Matlab/Simulink/ANN Based Modeling and
    Simulation of A Stand-Alone Self-Excited
    Induction Generator, Proc. of the International
    Conference on Communication, Computer and Power,
    ICCCP98, Dec.7-10 1998, Muscat, Sultanate of
    Oman, pp.93-98
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