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A NOVEL VOLTAGE STABILIZATION SCHEME FOR STANDALONE WIND ENERGY USING A DYNAMIC SLIDING MODE CONTROLLER

A NOVEL VOLTAGE STABILIZATION SCHEME FOR STANDALONE WIND ENERGY USING A DYNAMIC SLIDING MODE CONTROLLER. By Dr. A.M Sharaf (SM-IEEE) Weihua Wang (MscE. Student) Dept. of Electrical and Computer Engineering University of New Brunswick. OUTLINE. Introduction System Description

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A NOVEL VOLTAGE STABILIZATION SCHEME FOR STANDALONE WIND ENERGY USING A DYNAMIC SLIDING MODE CONTROLLER

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  1. A NOVEL VOLTAGE STABILIZATION SCHEME FOR STANDALONE WIND ENERGY USING A DYNAMIC SLIDING MODE CONTROLLER By Dr. A.M Sharaf (SM-IEEE) Weihua Wang (MscE. Student) Dept. of Electrical and Computer Engineering University of New Brunswick

  2. OUTLINE • Introduction • System Description • Novel PWM Switching Control Scheme • Modulated Power Filter Compensator • Simulation Results • Conclusion

  3. Introduction • Motivation of renewable wind energy • Fossil fuel shortage and its escalating prices • Reducing environmental pollution caused by conventional methods for electricity generation

  4. Introduction • Challenges of the reliability of wind power system • Fast load excursions • Wind velocity variations • Conventional passive capacitor compensation devices become ineffective

  5. Introduction • Reactive power compensation • Reduce voltage drop in distribution • Reduce feeder system losses • Enhance system power system • Induction generator employed in stand-alone wind generation cannot supply the required reactive power demand but instead it draws reactive power from the system for normal functioning

  6. System Description • Self-excited induction generator (SEIG) • Transformers and short feeder • Hybrid loads: linear load and motorized loads • The modulated power filter compensator (MPFC)

  7. Novel PWM Switching Control Scheme

  8. 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 a flexible and adaptive straight line switching surface • The output depends on the dynamic coefficients σandβ

  9. Novel PWM Switching Control Scheme • Objective: • To stabilize the voltage under random load and wind speed excursion • Maximize power/energy utilization • The scaling and time delays were selected using an offline guided trial and error method to minimize the objective function, which is the sum of all three basic loops.

  10. 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.

  11. Proposed MPFC Scheme and Its Functional Model

  12. Simulation Results • Digital simulation environment: • MATLAB 7.0.1/SIMULINK • Sequence of the disturbances: • t=0.2s, wind speed -8km/s • t=0.3s, a 100 kVA motor connected • t=0.4s, wind speed +8km/s • t=0.5s, a 50 kVA motor connected

  13. System Dynamic Response Without MPFC

  14. System Dynamic Response With MPFC

  15. Error plane of the dynamic error driven controller

  16. 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 3600kW.

  17. 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

  18. 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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