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Power Line Communication

Ghulam Yasin
Power Line Carrier
Communication






Voice signal modulated
on carrier frequency and
transmitted on power line
No nee...
PLC Technologies
 Three




network levels

High voltage (110–380 kV)
Medium voltage (10–30 kV)
Low voltage (230/400 V...
Power Line Carrier - Overview
 Data

Packets are sent over the existing
power lines





Power Line is the transmissio...
Power Line Carrier Technology
How does it work?
 Current

frequency is used as the carrier
 Information is sent in packe...
Digital PLCC-The Challenges
ahead
Two biggest problems1)Excessive Noise
Level
2) Cable Attenuation
Excessive Noise Level
 Noise

and disturbance includes-over
voltages, under voltages, frequency
variation and so on.
 Mo...
Signal Attenuation
 Signal

attenuation in power line is often
great and unpredictable measured up to
100db /km.
 As dev...
Applications







Internet access
Telephony
AMR( automated meter readings)
Home automation
Home security
Video con...
New technology in PLC
PLC has a number of new applications as –
 Broadband PLC
 Microwave Technology
 Frequency conditi...
Broadband PLC
 Developed

a low cost reliable means of
transmitting data, voice and video at high
speeds using the infras...
Microwave Technology






Used to pull data through magnetic field created by
AC flowing through electrical power
Modu...
Frequency Conditioned Power
Networking
 Send

over a billion bit of data per second
over electrical power lines
 It brea...
Why Power Lines For
Internet??






Offers right balance of cost, convenience and speed
It gives high speed internet ...
Will Electrical line replace
phone lines?
 New

power line technology would provide
data at almost 10 times the speed of
...
Power Line Carrier Technology
Advantages


No need for additional expensive communication
medium


Existing Power Line i...
Advantages

There are more electrical customers than telephone,
cable, and other wired communications customers
together.
...
Power Line Carrier Technology
Disadvantages – (Traditionally)
Transmitter power demands are high to increase
the signal tr...
PLCC Based AMR Network Architecture for LT
Commercial & Domestic Consumers
HT LINE
DCU

BCS

PSTN/GSM/GPRS
CDMA

LT
LINE

...
Primary Components

• 1 phase and 3 phase Direct Connected / CT operated
Multi-function Energy Meter with in-built PLCC Mo...
Conclusion


Tests in PLC have been carried out in 20 countries in
around 1500 residences. The mapping of results has
bee...
Lecture 3 plc
Lecture 3 plc
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Lecture 3 plc

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Transcript of "Lecture 3 plc"

  1. 1. Power Line Communication Ghulam Yasin
  2. 2. Power Line Carrier Communication    Voice signal modulated on carrier frequency and transmitted on power line No need for lying separate cable for transmission Integrates transmission of voice and data through same line
  3. 3. PLC Technologies  Three    network levels High voltage (110–380 kV) Medium voltage (10–30 kV) Low voltage (230/400 V, in the USA 110 V)  Modulation   OFDM CDMA and error correction
  4. 4. Power Line Carrier - Overview  Data Packets are sent over the existing power lines    Power Line is the transmission medium No need for radio transmitters or telephone connections for each meter Inherent on-line system design capability
  5. 5. Power Line Carrier Technology How does it work?  Current frequency is used as the carrier  Information is sent in packets modulated on the current frequency (Carrier Frequency) by the remote transmitter  Signals demodulated at the receiver end and information is then decoded.
  6. 6. Digital PLCC-The Challenges ahead Two biggest problems1)Excessive Noise Level 2) Cable Attenuation
  7. 7. Excessive Noise Level  Noise and disturbance includes-over voltages, under voltages, frequency variation and so on.  Most harmful noise for PLCC is that superimposed on power lines  Switching device such as light dimmers, induction motors and television cause such superimposed noise.
  8. 8. Signal Attenuation  Signal attenuation in power line is often great and unpredictable measured up to 100db /km.  As devices connected and disconnected from power network characteristics changes drastically  This makes coupling a signal to power network difficult.
  9. 9. Applications       Internet access Telephony AMR( automated meter readings) Home automation Home security Video conferencing
  10. 10. New technology in PLC PLC has a number of new applications as –  Broadband PLC  Microwave Technology  Frequency conditioned power networking
  11. 11. Broadband PLC  Developed a low cost reliable means of transmitting data, voice and video at high speeds using the infrastructure of electrical power grids and existing utility providers  Electrical power grid is most widespread, maintained worldwide network which provide economical broadband and LAN to every customer that has an electrical outlet
  12. 12. Microwave Technology    Used to pull data through magnetic field created by AC flowing through electrical power Modulating signals onto magnetic field allow to transmit signal through transformer over high voltage electrical transmission and distribution lines at speed up to 2.5 GB per second Microwave signals propagated can travel up to 2000 miles without regeneration. This allows the electrical grid to carry these communication services at near light speed
  13. 13. Frequency Conditioned Power Networking  Send over a billion bit of data per second over electrical power lines  It breaks the signals into multiple streams, each of which is pulled across the magnetic field in power grid.  Special receivers combine mini streams of data back into original data configuration.
  14. 14. Why Power Lines For Internet??     Offers right balance of cost, convenience and speed It gives high speed internet access through electrical networks Lower costs are achieved because the service is implemented on standard electrical lines and is already connected to almost all residence and business through electrical lines It speed would be 1Mbps, 20 times faster then a standard modem connection
  15. 15. Will Electrical line replace phone lines?  New power line technology would provide data at almost 10 times the speed of fastest connections currently available to home users  The new rate would be 1 Mbps
  16. 16. Power Line Carrier Technology Advantages  No need for additional expensive communication medium  Existing Power Line is the communication medium System can be on-line, and can alert the utility of power problems if no signal is detected from the customer end  Using this technique of communication the data can be transferred over the existing LT Power lines.  Encryption is provided for, to ensure the data accuracy, integrity and security 
  17. 17. Advantages There are more electrical customers than telephone, cable, and other wired communications customers together.  The backbone of the Internet as well as the long distance telephone lines are all fiber optic cables which can carry a signal for only 20 miles, without regeneration, coaxial cable 15 miles and copper telephone wire 5 miles. Signals over the power grid can travel more than 2000 miles without regeneration.  Existing electric power infrastructure. Only the substation server equipment and customer conditioning/service units need to be installed in order to establish a Digital Power line network. 
  18. 18. Power Line Carrier Technology Disadvantages – (Traditionally) Transmitter power demands are high to increase the signal travel distance  Transmitters are large due to large power requirements  Signals may not travel well through transformers or capacitors  Signals easily affected by noise on the lines  Applications are limited to short distances due to the above factors 
  19. 19. PLCC Based AMR Network Architecture for LT Commercial & Domestic Consumers HT LINE DCU BCS PSTN/GSM/GPRS CDMA LT LINE RU RU RU RU PLCC Data Flow From DCU To DCU RU RU RU RU
  20. 20. Primary Components • 1 phase and 3 phase Direct Connected / CT operated Multi-function Energy Meter with in-built PLCC Modem. • Data Concentrator Unit (DCU) with inbuilt PLCC Modem for communication with Meters & GSM /GPRS/ PSTN Modem communicating with the central station. • Base Computer software (BCS) installed at Master Station Server with GSM/GPRS/ PSTN Modem.
  21. 21. Conclusion  Tests in PLC have been carried out in 20 countries in around 1500 residences. The mapping of results has been extremely positive and forecasts a great demand for the system Digital power technology is definitely an exciting alternative to connect internet via phone and modem. Though this technology is not commercially available yet, it should be available over other broadband technologies due to relatively low cost of its local loop. Moreover, its high speed will provide internet access, local phone, and long distance service to customers
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