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A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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)
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
ABSTRACTA high static gain step-up dc–dc converters based on the modifiedSEPIC 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 of150V and with magnetic coupling operating with an output voltage equal to 300 V, presents efficiency equal to 92.2%.
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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.
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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.
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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 stepup 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.
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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.
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
BLOCK DIAGRAM
SOLAR PANEL ARAY 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
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
OPEN LOOP CONFIGURATION
Vdc Vload
SOLARPANEL
SEPIC CONVERTER
DC/DCLOAD
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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 VOLTAGESENSOR
+
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
STIMULATION CIRCUIT
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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.
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
HYBRID PSOGSA FLOWCHART
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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,
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT 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.
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
GATE PULSE GENERATION
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
INPUT OUTPUT WAVEFORM
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
HARDWARE CIRCUIT
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
SPECIFICATIONSS.NO PARAMETERS SPECIFICATIONS
1. DIODE IN7004
2. POWER MOSFET IRFP460
3. OPTO ISOLATORS PC817
4. MICROCONTROLLER PIC16F877A
5. VOLTAGE REGULATOR IC7812
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
HARDWARE KIT WITH OUTPUT
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
OVERALL HARDWARE KIT COUPLING
INDUCTOR CONVERTER CIRCUIT SENSING
CIRCUIT MOTHER
BOARD TRIGGERING CIRCUIT
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
CONVERTER CIRCUIT
DIODE( IN4007 )
POWER MOSFET (IRFP460) WITH HEAT SINK
FUSE
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
MOTHER BOARD
LCD DISPLAY OSCILLATOR RESET KEY (PIC16F877A ) MICROCONTROLLER REGULATOR START AND
STOP KEY
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
SENSING CIRCUIT OUTPUT VOLTAGE
SENSOR
INPUT CURRENT SENSOR
INPUT VOLTAGE SENSOR
OPAMP
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
TRIGGERING CIRCUIT DIODE ( IN4007) RECTIFIER CIRCUIT
OPTO ISOLATOR (PC817)
REGULATORS
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
RESULTPARAMETERS SEPIC
CONVERTER WITHOUT MAGNETIC COUPLING
SEPIC CONVERTER WITH MAGNETIC COUPLING
INPUT VOLTAGE(Vi) 15 V 15 V
OUTPUT VOLTAGE(Vo) 150 V 300VOUTPUT POWER (Po) 100 W 100 WSWITCHING FREQUENCY
24 KHZ 24 KHZ
DUTY CYCLE (D) 0.82 0.82
SWITCH VOLTAGE(Vs) 83 83STATIC GAIN (q) 10 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 PA RT 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
A G N I C O L L E G E O F T E C H N O L O G YD E PA RT M E N T O F E E E
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