Subscribe to EDN

Power line communication sees increasing interest for Smart Grid

February 25, 2009

Here’s an summary of the first steps needed in the move towards the smart grid: Why Your Smart Grid Must Start with Communications from Smart Grid News. The authors, Meir Shargal and Doug Houseman of energy consulting firm Capgemini, list five steps, which I’ve excerpted and summarized here:

Power meter1. Gathering data: Collect data from many sources on the grid (sensors, meters, voltage detection, etc.), in the customer premises (sensors for high-consuming appliances, etc.), and from external sources (weather, etc). How many devices, how big is the data and how often do you want to talk to the devices? … Remember that data travels in two directions and one of the largest transfers of data to devices is firmware updates. 

2. Analyzing and forecasting needs: In the typical world not all the data that a device can send is sent, but there are times when the engineering team needs additional data for forecasting or analysis. (This sounds similar to what Jeffrey Taft told us about the importance of DSP analysis of grid data in this EDN Voices column: IBM’s Jeffrey Taft: Bringing intelligence to the power grid

 3. Security Requirements and Security Overhead: Standards like NERC-CIP and emerging standards in Europe require a level of security that adds to the traffic on the network. Additionally, standards like ZigBee and HomePlug can have message traffic which is more than 75 percent security overhead. 

4. Monitoring / managing / acting: Once you know what the grid is doing, you have to act on it, and the latency on those actions is impacted by the traffic level on the communications network. 

5. Rebuilding the grid to support bidirectional power flow, looping circuits and transfer of power from substation to substation: The first four steps will have little impact to the end customers if you cannot act on the information that is collected and analyzed. This will be the most expensive part of the Smart Grid deployment, and will in most cases, take 20 years or more to complete across a whole service territory. [I added the italics.]

Ok, with this lead-in on the importance of communications to the Smart Grid, let’s circle back to today’s announcement of Analog Devices’ purchase of the PowerBUS RHINO power-line communication (PLC) technology from Domosys Corp. This technology fits in nicely with ADI’s power meter ICs, such as the ADE51xx and ADE55xx single-chip metering devices.

Maxim, on the other hand, has developed its own MAX2990, an OFDM-based, power-line communication (PLC) modem, which supports two-way data communication over AC and DC powerlines at speeds up to 100kbps. (OFDM = Orthogonal frequency-division multiplexing.)  Las December, Maxim announced it had won a contract to define and develop a next-generation, powerline-communication solution for Electricité Réseau Distribution France (ERDF), in partnership with French-based Sagem Communications.

Brian’s Brain post on general PLC mentions ham-radio operators’ concerns about EMI concerns, which comments on this PowerSource thread on broadband-over-powerline communications also raised.

The Smart Grid will ultimately be decided by an international diverse group of government bureaucrats, so who knows what technology(ies) will ultimately be adopted, but PLC technology looks like a top contender for the Smart Grid communication backbone.

Posted by Margery Conner on February 25, 2009 | Comments (7)

April 13, 2009
In response to: Power line communication sees increasing interest for Smart Grid
Steve-O commented:

Oh yes indeedee. Let''s make even more of the grid hackable and potentially accessible to those who would like to undermine same to the detriment of our nation. How dumb is "Smart" ?


April 10, 2009
In response to: Power line communication sees increasing interest for Smart Grid
wunderbug commented:

Data over Power Lines will not work especially after the last NE ice storm. It makes more sense to have the user have time of day cost of electricity via the local utility web site and obtain their actual demand useage so the user can plan when to run expensive devices (dryer, heaters, dishwasher, etc). Most utilities have special rates for these devices if they can shut them off during high demands/emergency conditions and make use of radio control. The addition of customer loss of power and demand requested useage should not be a big deal to implement. Let the customer control their useage and keep the criminals out of knowing your at home schedules....... The utility should invest in Distribution Automation, alternate sources (looped circuits) that are self healing with real time data.


March 10, 2009
In response to: Power line communication sees increasing interest for Smart Grid
ismail ADAM commented:

Based on my experience, such high speed supervisory control and data acquisition isn't worth a cent for power line. A lot of thing need revise such interconnected all the transformer etc. PLC just suited for simple supervisory control and data acquisition in one's premises.


March 10, 2009
In response to: Power line communication sees increasing interest for Smart Grid
Not so pessimistic ... but commented:

I'm curious why sattelite communications is not the way to do whatever communications is necessary for balancing distribution. It seems that having meters report usage through a USB port incentivised by a discount would be pretty simple to get people to do. Many of us already use recycle bins just because we think it is good for the environment. I always thought that smart grid meant routing power to minimze losses. Isn't that what we really want to do.


February 27, 2009
In response to: Power line communication sees increasing interest for Smart Grid
F-Tex commented:

This is a masked prelude to energy usage taxation. Energy usage will be reported and fines levied for busting what some faceless bureaucrat deems excessive "carbon release".


February 26, 2009
In response to: Power line communication sees increasing interest for Smart Grid
testingtom commented:

Is SmartGrid now only a code word for revenue enhancements for the power companies? What is described would certainly not be applicable to any actual high level power grid security and reliability improvements. A basic rule for truly secure Control & Communication of any system would be to NEVER have any significant system supervisory traffic rely on the integrity of the controlled system itself. Any real smart and secure distribution grid would have to include separate paths for critical control functions. This story is just about further enabling the lust for revenue at your local utility.


February 26, 2009
In response to: Power line communication sees increasing interest for Smart Grid
HJK commented:

Seems overly complex without any real return. Power company needs to know power consumption, power factor, maybe voltage, verse time of day. Weather information is readily available elsewhere. Cummunication is important, however, if the information is limited to what is useful, not a big deal even with strong security. Use the KISS principle and the system might make sense. Avoid all of the sensors that provide little useful information. It would make much more sense to spend the money to revamp the power grid to improve reliability instead. Smart meter eliminate the cost of a meter reader, they do litte else for the power company and even less for the consumer.

POST A COMMENT
Display Name
captcha

Before submitting this form, please type the characters displayed above. Note the letters are case sensitive:

Advertisement
Advertisement
Advertisement
About EDN   |   Site Map   |   Contact Us   |   Subscription   |   RSS
© 2012 UBM Electronics. All rights reserved.
Use of this Web site is subject to its Terms of Use | Privacy Policy

Please visit these other UBM Canon sites

UBM Canon | Design News | Test & Measurement World | Packaging Digest | EDN | Qmed | Pharmalive | Appliance Magazine | Plastics Today | Powder Bulk Solids | Canon Trade Shows