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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

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

OUTLINE

  • Introduction

  • System Description

  • Novel PWM Switching Control Scheme

  • Modulated Power Filter Compensator

  • Simulation Results

  • Conclusion


Introduction

Introduction

  • Motivation of renewable wind energy

    • Fossil fuel shortage and its escalating prices

    • Reducing environmental pollution caused by conventional methods for electricity generation


Introduction1

Introduction

  • Challenges of the reliability of wind power system

    • Load excursion

    • Wind velocity variation

    • Conventional passive capacitor compensation devices become ineffective


System description

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


Novel pwm switching control scheme1

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 scheme2

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 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

Proposed MPFC Scheme and Its Functional Model


Simulation results

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 Without MPFC


System dynamic response with mpfc

System Dynamic Response With MPFC


Error plane of the dynamic error driven controller

Error plane of the dynamic error driven controller


Conclusion

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

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


Reference1

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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