Post on 03-Jun-2018
transcript
8/12/2019 FYP finalh
1/28
8/12/2019 FYP finalh
2/28
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
8/12/2019 FYP finalh
3/28
8/12/2019 FYP finalh
4/28
8/12/2019 FYP finalh
5/28
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
8/12/2019 FYP finalh
6/28
Priorities
Solar Panel will be given priority
Both sources will be used
Manually driven cycle generator as backup
8/12/2019 FYP finalh
7/28
Calculation Equations
8/12/2019 FYP finalh
8/28
Calculations
8/12/2019 FYP finalh
9/28
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
8/12/2019 FYP finalh
10/28
Solar panelDC-DCBoost
Converter
Batterychargingcontroller
Battery
Voltage andCurrentsensingCircuit
u-controllerDuty cycle
DC-Load
MPPT
AC LOAD
Solar Part Block Diagram
8/12/2019 FYP finalh
11/28
MPPT
Why MPPT is needed?Power supplied by Panel Vary within the day.
To track max power and transfer it to the load side.
8/12/2019 FYP finalh
12/28
Current and Voltage Sensing
Circuitry
8/12/2019 FYP finalh
13/28
8/12/2019 FYP finalh
14/28
8/12/2019 FYP finalh
15/28
Current vs Voltage Graph
MPP
8/12/2019 FYP finalh
16/28
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
8/12/2019 FYP finalh
17/28
Algorithms to Track Max. Power
Point
Perturb & ObservationMethod.
Incremental ConductanceMethod.
8/12/2019 FYP finalh
18/28
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
8/12/2019 FYP finalh
19/28
/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
8/12/2019 FYP finalh
20/28
Design of ADC and PWM Module
8/12/2019 FYP finalh
21/28
8/12/2019 FYP finalh
22/28
8/12/2019 FYP finalh
23/28
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;
}
8/12/2019 FYP finalh
24/28
Battery Charging Controller
8/12/2019 FYP finalh
25/28
Square Wave Inverter
8/12/2019 FYP finalh
26/28
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
8/12/2019 FYP finalh
27/28
TimelineWork to be done
Selection of generator for wind mill
Selection of manual cycle driven generator
Designing to work as a hybrid system
8/12/2019 FYP finalh
28/28
Thank You