Smart Meter Design for Smart Grid

Design Engineer:

Aftab Hussain – 2008-NUST-BEE-467

Project Advisor:

Dr. Tauseef Tauqeer, SEECS NUST

Project Description Design a monitoring tool that measures the power consumption of an electrical device and transmits the data to the power supplier company through GSM modem. It also includes automatic supply of power according to the need of the users by switching the relays.

Domain Model

USER

DEVICE

Measure

LCD RS232 GSM Modem

LOAD

GSM Modem RS232 Microcontroller

Relay1

Relay2

Relay3

INV1

INV2

INV3

Transmit

Receive

The Smart MeterImplemented

1. Purely with PIC Microcontroller2. Through the SPI interfacing of PIC with CS54633. Adding the prepaid and smart grid functionality

Meter with PIC MicrocontrollerIP

+4

IP-

5

VIOU

T3

VCC

1

GND

2

U2ACS755XCB-050

MCLR/VPP1

RA0/AN02

RA1/AN13

RA2/AN2/VREF-4

RA3/AN3/VREF+5

RA4/T0CKI6

RA5/AN4/SS/LVDIN7

RE0/RD/AN5 8

RE1/WR/AN6 9

RE2/CS/AN7 10

OSC1/CLKI13

RA6/OSC2/CLKO14

RC0/T1OSO/T1CKI 15

RC2/CCP1 17

RC3/SCK/SCL 18

RD0/PSP0 19

RD1/PSP1 20

RD2/PSP2 21

RD3/PSP3 22

RD4/PSP4 27

RD5/PSP5 28

RD6/PSP6 29

RD7/PSP7 30

RC4/SDI/SDA 23

RC5/SDO 24

RC6/TX/CK 25

RC7/RX/DT 26

RB0/INT033

RB1/INT134

RB2/INT235

RB3/CCP2B36

RB437

RB5/PGM38

RB6/PGC39

RB7/PGD40

RC1/T1OSI/CCP2A 16

U1

PIC18F452

VCC

AC1

TR1

TRANSFORMER

BAT116V

U4

OP1PR110k

+88.8AC Am

ps

R69k

R41k

+88.8

+88.8AC Volts

+88.8AC Volts

R2050

Zero Cross Detector

C1

30uF

D714

D613

D512

D411

D310

D29

D18

D07

E6

RW5

RS4

VSS

1

VDD

2

VEE

3

LCD1LM016L

A

B

C

D

RXD

RTS

TXD

CTS

voltage Current

Algorithms

Take analog input and give it to the analog input pin AN0

The ADC samples the input and we take the peak value

Divide this value by sqrt(2) Multiply this peak value with

the resistor and transformer ratio

Take analog input and give it to the analog input pin AN1

The ADC samples the input and we take the peak value

Divide this value by sqrt(2) Multiply this peak value

with the transformer ratio

Power factor1. Check for voltage cross zero from negative to positive2. Timer T starts (T)3. Timer T starts ( T2)4. Check for current cross zero from negative to positive5. Timer T stops6. Check again for voltage cross zero from negative to

positive7. Timer T stops8. Phase φ = ( T2 / T) * 36009. Get cos φ

Simulations