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FYP finalh

Jun 03, 2018

Documents

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Brief Overview Wind and Solar energy is to charge the same battery

efficiently

Design to operate as a stand alone system

Manual cycle driven generator

Microcontroller will be used

Priorities will be set

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Block Diagram

Solar Panel

100 Watts

Wind Mill

100 Watts

Manual cycle

driven

generator

Battery

20 AH

Charge

Controller

Battery

charging

controllerSingle

phase

RectifierAC Load

70 Watts

Square

wave

Inverter

DC Load

25 Watts

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Priorities

Solar Panel will be given priority

Both sources will be used

Manually driven cycle generator as backup

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Calculation Equations

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Calculations

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Back up Time for DC load

Power Generated by 100 Watt Panel during 10 Hours

= 100W*0.80*10Hours = 800 Wh

Total Power given by battery = 7.1hours * 70 Watts= 497 Wh

So Power left for DC load is = 800Wh 497 Wh = 303 Wh

We can use 30.3 Watts load for 10 Hours

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Solar panelDC-DCBoost

Converter

Batterychargingcontroller

Battery

Voltage andCurrentsensingCircuit

u-controllerDuty cycle

DC-Load

MPPT

AC LOAD

Solar Part Block Diagram

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MPPT

Why MPPT is needed?Power supplied by Panel Vary within the day.

To track max power and transfer it to the load side.

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Current and Voltage Sensing

Circuitry

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Current vs Voltage Graph

MPP

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PIC Micro-controller

I-V relationship used to track maximum power

PIC output will be given as input to transistor of boostconverter

Algorithm designed to track max power by changing Duty

cycle D.

PIC microcontroller

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Algorithms to Track Max. Power

Point

Perturb & ObservationMethod.

Incremental ConductanceMethod.

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Perturb & Observation Method

Modifying the panel voltage is done by modifyingthe converter duty cycle

The basic algorithm uses a fixed step to increase ordecrease voltage

The size of the step determines the size of thedeviation while oscillating about the MPP

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/START

DUTY =50%

Increase VoltageorIncrease Duty cycle

Decrease VoltageorDecrease Dutycycle

Yes

No

Yes

No > >

Pk = Current power reading

Pk-1 = Previous power reading

Increase duty cycle

Decrease duty cycle

P & O Algorithm

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Design of ADC and PWM Module

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Codeunsigned int volt,curent,power;void main(){ short duty = 0; //initial value for dutyADCON1 = 0xFF;TRISA = 0xFF;PWM1_Init(1000); //Initialize PWM1PWM1_Start(); //start PWM1PWM1_Set_Duty(duty); //Set current duty for PWM1

volt = ADC_Read(1);

curent = ADC_Read(2);power = volt*curent;if (volt>PORTB && dutyPORTC){

Delay_ms(40);duty = duty + 1; //increment current_dutyPWM1_Set_Duty(duty); //Change the duty cycle

}else if (volt0 && power>PORTB)

{Delay_ms(40);duty = duty - 1; //decrement dutyPWM1_Set_Duty(duty);

}Delay_ms(10); // slow down change pace a littlePORTB=volt;PORTC=power;

}

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Battery Charging Controller

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Square Wave Inverter

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Timeline

Work Completed

Battery Charging Controller

Calculations for charging current, charging time and backup time

Current and voltage sensors

Square wave inverter

Coding of microcontroller

Work Under Progress

Designing of boost converter

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TimelineWork to be done

Selection of generator for wind mill

Selection of manual cycle driven generator

Designing to work as a hybrid system

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Thank You

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