1. SOLAR TRACKING USING FUZZY LOGIC
Presented By
Megha Srikanth

2. An Overview Introduction Principle of MPPT Control MPPT techniques
P & O controller
Fuzzy logic of MPPT control
Conclusion

3. 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

4. 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

5. Current-voltage characteristic of a PV module

6. Photovoltaic system

7. MPPT TECHNIQUES Voltage feedback based methods
Current feedback based methods
Power based methods

8. 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 > 0 , the voltage is increased, D (k )= D (k – 1) + C
when dp / dv < 0 , the voltage is decreased, D(k ) = D(k − 1) − C .

9. Power-voltage characteristic of a PV module

10. Basic circuit of the boost chopper

11. 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.

12. General diagram of a fuzzy controller

13.   Membership functions of (a) error E - (b) change of error CE - (c) duty ratio D

14. CONCLUSION
Fuzzy controller is faster than the P&O 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

15. 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