SOLAR TRACKING USING FUZZY LOGIC

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SOLAR TRACKING USING FUZZY LOGIC

• Presented By
• Megha
  Srikanth

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An Overview

• Introduction
• Principle of MPPT Control
• MPPT techniques
• P O controller
• Fuzzy logic of MPPT control
• Conclusion

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INTRODUCTION

• This scheme is capable of following the
  trajectory of the sun throughout the day on a
  year-round basis.
• Various schemes have been proposed for optimizing
  the tilt angle and orientation of solar
  collectors
• The actual energy conversion efficiency of PV
  module is rather low

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PRINCIPLE OF MPPT

• The photovoltaic module operation depends
  strongly on the load characteristics
• The connection between the source and the load is
  considered
• Furthermore the characteristics of a PV system
  vary with temperature and insulation

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Current-voltage characteristic
of a PV module
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Photovoltaic system
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MPPT TECHNIQUES

• Voltage feedback based methods
• Current feedback based methods
• Power based methods

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P O CONTROLLER

• Principle is to provoke perturbation by acting on
  the PWM duty cycle and observing the effect on
  the output PV power.
• when dp / dv gt 0 , the voltage is increased, D (k
  ) D (k 1) C
• when dp / dv lt 0 , the voltage is decreased, D(k
  ) D(k - 1) - C .

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Power-voltage
characteristic
of a PV module
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Basic circuit of the boost chopper
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Fuzzy logic of MPPT control

• They have the advantage to be robust and
  relatively simple to design
• They do require the complete knowledge of the
  operation of the PV system by the designer.

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General diagram of a fuzzy controller
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Membership functions of (a)
error E - (b) change of error CE - (c) duty ratio
D
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CONCLUSION

• Fuzzy controller is faster than the PO
  controller in the transitional state
• Presents also a much smoother signal with less
  fluctuations in steady state
• It can provide an order more effective than the
  traditional controllers for the nonlinear systems

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REFERENCES

• V. Salas, E. Olias, A. Barrado and A. Lazaro,
  Review of the Maximum Power Point Tracking
  Algorithms for Stand-Alone Photovoltaic Systems,
  Solar Energy Materials Solar Cells
• H. Knopf, Analysis, Simulation and Evaluation of
  Maximum Power Point Tracking (MPPT)
• F. Boehinger, Self Adaptive DC Converter for
  Solar Spacecraft Power Supply, IEEE