How CenterPoint’s Integrated Smart Grid Is Paying Off

How CenterPoints Integrated Smart Grid Is Paying Off

Back in 2009, Texas utility CenterPoint Energy landed a $200 million Department of Energy stimulus grant to carry out a $750 million smart grid project, one of the biggest in the country. It started with 2.3 million smart meters capable of detecting power outages and helping field crews and customers know how quickly they could be fixed, and added some 750 Intelligent Grid devices to reroute power across storm-damaged distribution circuits in seconds. Finally, it has connected it all with a high-speed wireless network and an underlying advanced distribution management software (ADMS) platform, one that's collecting and analyzing data for utility departments from field crews to financial planners.

Early this month, the utility serving the greater Houston area got a thumbs-up from DOE officials for turning that investment into tangible value. On the outage management front, CenterPoint has signed up more than 400,000 customers to its outage auto-alert system, giving them up-to-date notification of when power will be restored. At the same time, it has used its smart meters outage detection capabilities to restore power to more than 1 million customers without them having to pick up the phone -- the traditional way that utilities learn of power outages on the edges of their network.

As for its Intelligent Grid project, also known as a fault location, isolation and service restoration (FLISR) system, it has prevented more than 102 million customer outage minutes in more than 1,000 outage events since 2011, according to CenterPoint's latest statistics. The IG system now covers about 13 percent of CenterPoint's distribution system, serving about 417,000 customers, and the utility plans to take it system-wide over the next decade or so.

Many utilities are using smart meters as outage management tools, to send detailed outage information to utility crews and blacked-out customers. Others have deployed self-healing FLISR systems to restore power to as many customers as possible before crews arrive, during everyday outages or in the midst of major storms.

But CenterPoint has also paid attention to the bigger picture, in terms of making sure it has integrated in-the-field and back-office IT systems to support multiple day-to-day and long-term needs. GTM Research recognized that work in 2013, when it named CenterPoint as one of the three most mature smart grid utilities in the country.

Now CenterPoint is looking at how it can put this technology to broader use, like predicting transformer failures before they occur, or forecasting the effects of new rooftop solar and changing customer loads on the distribution grid, according to Kenny Mercado, CenterPoints senior vice president of electric operations.

We now have a very real system thats integrated into our advanced metering and enables us to have control and visibility into our distribution system, he said in an interview this week. That includes some complex integration of smart meters from Itron, meter data management software from Siemens eMeter, high-speed wireless radios from General Electric, and FLISR equipment and ADMS from ABB.

We're thinking of this as an enterprise foundation for the future, Mercado said. Given the changes coming to the grid with the rise of rooftop solar, energy storage, and energy-smart home and businesses, within 10 years or sooner, the distribution grid will look a lot different -- and we cant wait until its too late. We need a system thats ready to absorb these dynamics now.

Merging technology, people and planning to reduce time, scope of outages

When CenterPoint started on its smart meter deployment, the path we went down was around outage management, Mercado said -- a natural focus for a utility that had just suffered through 2008's Hurricane Ike, which blacked out about 1.9 million customers and left some without power for weeks after. Beyond collecting interval billing data, conducting remote connect and disconnect functions, and other standard advanced metering infrastructure (AMI) fare, CenterPoint wanted to make sure that its new smart meters could send power-off notifications and signal when power was restored, in a way that could help system operators and field crews restore power as quickly as possible.

CenterPoint began by working with ABB to map out its distribution grid, and match the location of smart meters to the SCADA system that monitors and controls grid points down to the substation.

Thats a fairly fundamental task, but important to get an accurate coordination of what the smart meter data is telling the system, and what's coming in from the substations, field crews and other parts of the outage-solving puzzle. To allow them to share data with confidence, we needed to evaluate our processes, input the data from the meter, and take out the bad data, he said.

Completing that work, however, can allow dispatchers and work crews to trust that the automated outage detection data they're getting through their radios, laptops or mobile devices is accurate. That allows you to stream bits of data, and that information comes into their console, and that allows them to make decisions faster, he said. All told, CenterPoint estimates that outages can now be identified 50 percent to 75 percent faster than the old-fashioned methods of matching customer phone calls to locations on the map, and sending crews to drive around the area in trucks looking for faults.

That kind of cross-platform data sharing and visibility became even more important when CenterPoint started to turn on its self-healing Intelligent Grid system. This network of reclosers and switches, connected via high-speed wireless to CenterPoints distribution operation center, can clear a fault, isolate the fault, and close a normally open switch, using the ABB Tropos wireless communications, in 108 milliseconds, Gary Rackliffe, ABBs vice president of smart grids for North America, said in an interview this week.

FLISR systems dont repair downed power lines, but they do reroute electricity around the damaged circuit, restoring power to as many customers as possible before repairs take place, he said. Instead of having a truck drive out there to do the switching procedures, then driving out to repair the fault, you can send the truck straight to the fault, he said -- although that also requires tight coordination between the people running the FLISR system and dispatchers and field crews.

Source: Greentech Media

Smart Grid Bulletin March 2019

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