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sepic converter project

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sepic converter project

  1. 1. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E A MODIFIED CLOSED LOOP CONTROL OF HIGH STATIC GAIN SEPIC CONVERTER WITH MAGNETIC COUPLING FOR RENEWABLE APPLICATIONS BATCH MEMBERS: MURALI KRISHNAN L (312811105021) VIGNESH R (312811105047) VIGNESH V (312811105048) GUIDED BY Mr.D JOHN SUNDAR (AP/EEE)
  2. 2. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E PRESENTATION OUTLINE  ABSTRACT  OBJECTIVE  MOTIVATION  PROBLEM STATEMENT  LITERATURE REVIEW  BLOCK DIAGRAM  SIMULATION CIRCUIT  DESCRIPTION OF HYBRID PSAGSO ALGORITHM  WAVEFORMS  HARDWARE CIRCUITS  RESULTS  CONCLUSION
  3. 3. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E ABSTRACT A high static gain step-up dc–dc converters based on the modified SEPIC Converter is presented in this paper. The proposed topologies present low switch voltage and high efficiency for low input voltage and high output voltage applications. The configurations with magnetic coupling is presented and analyzed. The magnetic coupling allows the increase of the static gain maintaining a reduced switch voltage. The experimental prototypes were developed with an input voltage equal to 15 V and an output power equal to 100 W. The efficiency at nominal power obtained with the prototype without magnetic coupling was equal to 91.9% with an output voltage of 150V and with magnetic coupling operating with an output voltage equal to 300 V, presents efficiency equal to 92.2%.
  4. 4. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E OBJECTIVE  To design a closed loop high static gain step-up DC-DC converter with magnetic coupling based on the modified SEPIC converter .  To present a topology with low switch voltage and high efficiency for low input voltage and high output voltage applications.
  5. 5. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E MOTIVATION  Electricity demand is the major concern in the world today.  To meet the demand the number of natural sources comes under electricity production.  Among those sources solar energy is considered as it is most readily available and free source of energy since prehistoric times.  It is estimated that solar energy equivalent to over 15,000 times the world's annual commercial energy consumption reaches the earth every year.  Single ended primary inductor with solar energy is considered for the improvement of power generation.
  6. 6. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E PROBLEM STATEMENT  In SEPIC converter the voltage at its output to be greater than, less than or equal to that its input, whereas in high static gain SEPIC converter the output voltage is higher than its input voltage.  The magnetic coupling allows the increase of static gain maintaining a reduced switch voltage
  7. 7. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E LITERATURE REVIEW (D. Meneses, F. Blaabjerg, O. Garcia, and J. A. Cobos, “Review and comparison of step up transformerless topologies for photovoltaicAC-Module application,” IEEE Trans. Power Electron., vol. 28, no. 6, pp. 2649–2663, Jun. 2013.)  This paper presents a comprehensive review of step-up single-phase non-isolated inverters suitable for ac-module applications. In order to compare the most feasible solutions of the reviewed topologies, a benchmark is set. (C. W. Li and X. He, “Review of non-isolated high step-up DC/DC converters in photovoltaic grid- connected applications,” IEEE Trans. Ind. Electron., vol. 58, no. 4, pp. 1239–1250, Apr. 2011.)  This paper is concerned with how to achieve high-step-up, low-cost, and high-efficiency dc/dc conversion which is the major consideration due to the low PV output voltage with the parallel-connected structure. The limitations of the conventional boost converters in these applications are analyzed.
  8. 8. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E LITERATURE REVIEW (D. Zhou, A. Pietkiewicz, and S. Cuk, “A Three-Switch high-voltage converter,” IEEE Trans. Power Electron., vol. 14, no. 1, pp. 177–183, Jan.)  A novel single active switch two-diodes high-voltage converter is presented. This converter can operate into a capacitor-diode voltage multiplier, which offers simpler structure and control, higher efficiency, reduced electromagnetic interference (EMI), and size and weight savings compared with traditional switched-mode regulated voltage multipliers. (E. H. Ismail, M. A. Al-Saffar, A. J. Sabzali, and A. A. Fardoun, “A family of single- switchPWM converters with high step-up conversion ratio,” IEEE Trans. Circuits Syst. I, Reg Papers, vol. 55, no. 4, pp. 1159–1171,)  A new family of a single-switch three-diode dc-dc pulse width-modulated (PWM) converters operating at constant frequency and constant duty cycle is presented in this paper. The proposed converters are different from the conventional dc-dc step-up converters, and they posses higher voltage gain with small output voltage ripples.
  9. 9. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E BLOCK DIAGRAM SOLAR PANELARAY Vdc Vac Vgrid MPPT Vpv SEPIC Vload CONVERTER AC GRID DG INTERFACED GRID CONNECTED SYSTEM WITH DISTRIBUTED GENRATOR (SOLAR , WIND , FUEL CELL…) DC/DC DC/AC FILTER LOAD
  10. 10. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E OPEN LOOP CONFIGURATION Vdc Vload SOLAR PANEL SEPIC CONVERTER DC/DC LOAD
  11. 11. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E CLOSED LOOP CONFIGURATION PWM PULSE FOR MOSFET SWITCH CONTROL SIGNAL ERROR Vact Vset PANEL CONVERTER LOAD PWM GENERATION PI CONTROLLER VOLTAGE SENSOR+
  12. 12. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E STIMULATION CIRCUIT
  13. 13. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E HYBRID PSOGSA ALGORITHM  A new hybrid population-based algorithm (PSOGSA) is proposed with the combination of Particle Swarm Optimization (PSO) and Gravitational Search Algorithm (GSA).  The main idea is to integrate the ability of exploitation in PSO with the ability of exploration in GSA to synthesize both algorithms’ strength.
  14. 14. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E HYBRID PSOGSA FLOWCHART
  15. 15. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E HYBRID PSOGSA ALGORITHM  In PSOGSA, at first, all agents are randomly initialized. Each agent is considered as a candidate solution. After initialization, Gravitational force, gravitational constant, and resultant forces among agents are calculated. After that, the accelerations of particles are defined as,  In each iteration, the best solution so far should be updated. After calculating the accelerations and with updating the best solution so far, the velocities of all agents can be calculated. Finally, the positions of agents are defined as,
  16. 16. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E HYBRID PSOGSA ALGORITHM  The process of updating velocities and positions will be stopped by meeting an end criterion.  The steps of PSOGSA are represented in figure above.  The agents near good solutions try to attract the other agents which are exploring the search space.  When all agents are near a good solution, they move very slowly. In this case, the gBest help them to exploit the global best.  PSOGSA use a memory (gBest) to save the best solution has found so far, so it is accessible anytime.  Each agent can observe the best solution so far and tend toward it. With adjusting weighting factors , the abilities of global search and local search can be balanced.
  17. 17. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E GATE PULSE GENERATION
  18. 18. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E INPUT OUTPUT WAVEFORM
  19. 19. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E HARDWARE CIRCUIT
  20. 20. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E SPECIFICATIONS S.NO PARAMETERS SPECIFICATIONS 1. DIODE IN7004 2. POWER MOSFET IRFP460 3. OPTO ISOLATORS PC817 4. MICROCONTROLLER PIC16F877A 5. VOLTAGE REGULATOR IC7812
  21. 21. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E HARDWARE KIT WITH OUTPUT
  22. 22. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E OVERALL HARDWARE KIT COUPLING INDUCTOR CONVERTER CIRCUIT SENSING CIRCUIT MOTHER BOARD TRIGGERING CIRCUIT
  23. 23. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E CONVERTER CIRCUIT DIODE( IN4007 ) POWER MOSFET (IRFP460) WITH HEAT SINK FUSE
  24. 24. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E MOTHER BOARD LCD DISPLAY OSCILLATOR RESET KEY (PIC16F877A ) MICRO CONTROLLER REGULATOR START AND STOP KEY
  25. 25. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E SENSING CIRCUIT OUTPUT VOLTAGE SENSOR INPUT CURRENT SENSOR INPUT VOLTAGE SENSOR OPAMP
  26. 26. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E TRIGGERING CIRCUIT DIODE ( IN4007) RECTIFIER CIRCUIT OPTO ISOLATOR (PC817) REGULATORS
  27. 27. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E RESULT PARAMETERS SEPIC CONVERTER WITHOUT MAGNETIC COUPLING SEPIC CONVERTER WITH MAGNETIC COUPLING INPUT VOLTAGE(Vi) 15 V 15 V OUTPUT VOLTAGE(Vo) 150 V 300V OUTPUT POWER (Po) 100 W 100 W SWITCHING FREQUENCY 24 KHZ 24 KHZ DUTY CYCLE (D) 0.82 0.82 SWITCH VOLTAGE(Vs) 83 83 STATIC GAIN (q) 10 20
  28. 28. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E CONCLUSION  A new topologies of nonisolated high static gain converters are presented.  The structure with magnetic coupling can operate with static gain higher than 20 maintaining low the switch voltage.  The efficiency of the proposed converter with magnetic coupling is equal to 92.2% operating with input voltage equal to 15V, output voltage equal 300V, and output power equal 100W.  The commutation losses of the proposed converter with magnetic coupling are reduced due to the presence of the transformer leakage inductance and the secondary voltage multiplier that operates as a non dissipative clamping circuit to the output diode voltage
  29. 29. A G N I C O L L E G E O F T E C H N O L O G YD E P A R T M E N T O F E E E THANK YOU

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