PERFORMANCE OF POWER LINE COMMUNICATION SYSTEMS WITH NOISE REDUCTION SCHEME FOR SMART GRID APPLICATIONS

verdeagendaΗλεκτρονική - Συσκευές

21 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

71 εμφανίσεις

PERFORMANCE OF POWER LINE COMMUNICATION
SYSTEMS WITH NOISE REDUCTION SCHEME FOR
SMART GRID APPLICATIONS



ABSTRACT:



X10 protocol is meant for data communication over the power line which carries 230V,
50 Hz Ac supply. Here we are going to use the power line in the industry for data acquisition
purpose. This is an improvement of data communication over the power line.

X
10

is an international and open industry standard for
communication

among electronic
devices used for
home automation
, also known as
domotics
. It primarily uses
power line

wiring
for signaling and control, where the signals involve brief
radio frequency

bursts representing
digit
al

information.

Whether using power line or radio communications, packets transmitted using the X10
control protocol consist of a four
bit

house code

followed by one or more four bit
unit code
,
fina
lly followed by a four bit command.


In this paper, we propose clipping scheme and equalizer as methods to reduce the effects
of impulsive noise and channel attenuation in power line communication

(PLC)

system.
Clipping is cutting off the amplitude of the received signal over threshold level without its phase
change in order to reduce noise effects. The equalizer compensates for effects of PLC channel.
The performance is evaluated in terms of bit error ra
te (BER). From simulation results, it is
confirmed that the proposed clipping scheme has slightly better performance than conventional
PLC system. The results of the paper can be applied to PLC systems for smart grid.
1







WORKING
PRINCIPLE:



The device is a hardware interface that allows control data communication over the power line.
Its purpose is that of translating the serial output provided by some digital service, like a
microcontroller, into a coded pulse train that is suitable for bein
g transmitted over the usual
domestic power lines. Conversely, the interface is able to extract such messages from the power
line and to convert them into serial streams that the connected digital device can read. The
interface therefore acts like a modem,

allowing the employment of the common electrical supply
network of a building as a local area network.

When coupled with a programmable digital device, such as a microprocessor or a
microcontroller, the device allows the realization of “intelligent” and
“communicative”
equipments that can interact with similar objects over a domestic network, without the need of
installing a dedicating wiring. Typical applications are in the field of Home and Building
Automation (management of surveillance and alarm syste
ms, home appliances automation, AMR
(Automatic Meter Reader), Home automation control, Security and surveillance, General
-
purpose isolated transceiver.

The innovative feature of these devices is that they transmit data on the power line, using the
concept
of conveyed wave (zero crossing).

We use an 8051

based microcontroller the at89c51

for the transmitter and the receiver. From a
keypad on the transmitter the relay section on the receiver can be controlled.










BLOCK DIAGRAM

:
























SWITCHES


ISOLATION TRANSFORMER

(150KHZ TUNED)


POWER LINE

MICRO

PHONE




230V MAIN SUPPLY




ISOLATION
TRANSFORMER

(200 KHZ TUNED)

LM 565 TONE
GENERATOR

MC

89C51




SPEAKER


RELAYS

UM 91214

DTMF
ENCODER

DTMF
DECODER


ULN2003


DRIVER



HARDWARE REQUIRED:



Microcontroller.



565 Tone Generator



555 Timer



ULN2003



LM386 Amplifier



Power Supply.



Microphone.



Relay.



UM91214 DTMF Encoder

s



UMC 8870 DTMF Decoder



Isolation Transformer




SOFTWARE REQUIRED:



Assembly Language Programming.



Keil cross compiler.