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A Low-cost Voltage Stabilization and Power Quality Enhancement Scheme for a Small Renewable Wind Energy Scheme. By Dr. A.M Sharaf (SM-IEEE) Dept. of Electrical and Computer Engineering University of New Brunswick. OUTLINE. Introduction System Description Novel PWM Switching Control Scheme

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A Low-cost Voltage Stabilization and Power Quality Enhancement Scheme for a Small Renewable Wind Energy Scheme

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A Low-cost Voltage Stabilization and Power Quality Enhancement Scheme for a Small Renewable Wind Energy Scheme

By

Dr. A.M Sharaf (SM-IEEE)

Dept. of Electrical and Computer Engineering

University of New Brunswick


OUTLINE

  • Introduction

  • System Description

  • Novel PWM Switching Control Scheme

  • Modulated Power Filter Compensator

  • Simulation Results

  • Conclusion


Introduction

  • Motivation of renewable wind energy

    • Fossil fuel shortage and its escalating prices

    • Reducing environmental pollution caused by conventional methods for electricity generation


Introduction

  • Challenges of the reliability of wind power system

    • Load excursion

    • Wind velocity variation

    • Conventional passive capacitor compensation devices become ineffective


System Description

  • Self-excited induction generator (SEIG)

  • Transformers and short feeder

  • Hybrid loads: linear load and non-linear load

  • The modulated power filter compensator (MPFC)


Novel PWM Switching Control Scheme


Novel PWM Switching Control Scheme

  • Multi-loop dynamic error driven

    • The voltage stabilization loop

    • The load bus dynamic current tracking loop

    • The dynamic load power tracking loop

  • Using proportional, integral plus derivative (PID) control scheme

  • Simple structure and fast response


Novel PWM Switching Control Scheme

  • Objective:

    • To stabilize the voltage under random load and wind speed excursion

    • Maximize power/energy utilization

  • The control gains (Kp, Ki) are selected using a guided trial and error method to minimize the objective function, which is the sum of all three basic loops.


The Functional Model of MPFC

  • The capacitor bank and the RL arm are connected by a 6-pulse diode to block the reverse flow of current.

  • Capacitor size normally selected as 40%-60% of the non-linear load KVAR capacitor.


Proposed MPFC Scheme and Its Functional Model


Simulation Results

  • Digital simulation environment:

    • MATLAB 7.0.1/SIMULINK

  • Sequence of load excursion:

    • From 0s to 0.2s: Both Linear Load 200 kVA (50%) and nonlinear Load 200 kVA (50%) connected

    • From 0.2s to 0.4s: Linear Load 200 kVA(50%) connected only

    • From 0.4s to 0.6s: No load is connected


System Dynamic Response Without MPFC


System Dynamic Response With MPFC


Error plane of the dynamic error driven controller


Conclusion

  • The digital simulation results validated that the proposed low cost MPFC scheme is effective in voltage stabilization for both linear and nonlinear electrical load excursions.

  • The proposed MPFC scheme will be easily integrated in renewable wind energy standalone units in the range from 600kW to 1600kW.


Reference

  • [1] A.M.Sharaf and Liang Zhao, ‘A Novel Voltage Stabilization Scheme for Standalone Wind Energy Using a Facts Dual Switching Universal Power Stabilization Scheme’, 2005

  • [2] M.S. El-Moursi and Adel M. Sharaf, 'Novel STATCOM controller for voltage stabilization of wind energy scheme', Int. J. Global Energy Issues, 2006

  • [3] A. M. Sharaf and Guosheng Wang, ‘Wind Energy System Voltage and Energy Enhancement Using Low Cost Dynamic Capacitor Compensation Scheme’, 2004

  • [4] A.M. Sharaf and Liang Yang, 'A Novel Efficient Stand-Alone Photovoltaic DC Village Electricity Scheme’, 2005


Reference

  • [5] Pradeep K. Nadam, Paresk C. Sen, 'Industrial Application of Sliding Mode Control', IEEE/IAS International Conference On Industrial Automation and Control, Proceedings, pp. 275-280, 1995

  • [6] Paresk C. Sen, 'Electrical Motor and Control-Past, Present and Future', IEEE Transactions on Industrial Electronics, Vol.37, No.6, pp.562-575, December 1990

  • [7] Edward Y.Y. Ho, Paresk C. Sen, 'Control Dynamics of Speed Drive System Using Sliding Mode Controllers with Integral Compensation', IEEE Transactions on Industry Applications, Vol.21, NO.5, pp 883-892, September/October 1991.


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