Gleanings from the web and the world, condensed for convenience, illustrated for enlightenment, arranged for impact...

The challenge now: To make every day Earth Day.


  • ORIGINAL REPORTING: 'The future grid' and aggregated distributed energy resources
  • ORIGINAL REPORTING: Renewable Portfolio Standards offer billions in benefits
  • ORIGINAL REPORTING: Powered by PTC, wind energy expected to keep booming

  • TODAY’S STUDY: On The Way To 100% New Energy In Hawaii
  • QUICK NEWS, October 18: The Lack Of Climate Change In The Election; Trump And Clinton On Climate Change And New Energy; New Energy Keeps Booming

  • TODAY’S STUDY: New Energy For New Urbanists
  • QUICK NEWS, October 17: Chemical Mulitnationals Bet on Climate Solutions; World Wind Gets Bigger; SolarReserve Power Plant Possibilities Rising

  • Weekend Video: High Water Everywhere
  • Weekend Video: Chasing Extreme Weather To Catch Climate Change
  • Weekend Video: Wind Power On The Land

  • FRIDAY WORLD HEADLINE-Climate Change And Crazy Weather
  • FRIDAY WORLD HEADLINE-World Cities Thinking Urbanized New Energy
  • FRIDAY WORLD HEADLINE-Google’s African Wind


  • TTTA Thursday- Bob Dylan, 2001 – Highwater - For Charlie Patton
  • TTTA Thursday- Bob Dylan, 1989 – Political World
  • TTTA Thursday- Bob Dylan, 1978 – Where Are You Tonight (Journey Through Dark Heat)
  • --------------------------


    Anne B. Butterfield of Daily Camera and Huffington Post, f is an occasional contributor to NewEnergyNews


    Some of Anne's contributions:

  • Another Tipping Point: US Coal Supply Decline So Real Even West Virginia Concurs (REPORT), November 26, 2013
  • SOLAR FOR ME BUT NOT FOR THEE ~ Xcel's Push to Undermine Rooftop Solar, September 20, 2013
  • NEW BILLS AND NEW BIRDS in Colorado's recent session, May 20, 2013
  • Lies, damned lies and politicians (October 8, 2012)
  • Colorado's Elegant Solution to Fracking (April 23, 2012)
  • Shale Gas: From Geologic Bubble to Economic Bubble (March 15, 2012)
  • Taken for granted no more (February 5, 2012)
  • The Republican clown car circus (January 6, 2012)
  • Twenty-Somethings of Colorado With Skin in the Game (November 22, 2011)
  • Occupy, Xcel, and the Mother of All Cliffs (October 31, 2011)
  • Boulder Can Own Its Power With Distributed Generation (June 7, 2011)
  • The Plunging Cost of Renewables and Boulder's Energy Future (April 19, 2011)
  • Paddling Down the River Denial (January 12, 2011)
  • The Fox (News) That Jumped the Shark (December 16, 2010)
  • Click here for an archive of Butterfield columns


    Some details about NewEnergyNews and the man behind the curtain: Herman K. Trabish, Agua Dulce, CA., Doctor with my hands, Writer with my head, Student of New Energy and Human Experience with my heart




      A tip of the NewEnergyNews cap to Phillip Garcia for crucial assistance in the design implementation of this site. Thanks, Phillip.


    Pay a visit to the HARRY BOYKOFF page at Basketball Reference, sponsored by NewEnergyNews and Oil In Their Blood.

  • ---------------

  • How Climate Change Is A Health Insurance Problem
  • World Wind Can Be A Third Of Global Power By 2030
  • First U.S. Solar Sidewalks Installed
  • Looking Ahead At The EV Market

    Tuesday, December 09, 2014


    Smart inverters: The secret to integrating distributed energy onto the grid?; Utilities and research teams are taking distributed energy solutions to the wires."

    Herman K. Trabish: June 4, 2014 (Utility Dive)

    New advanced inverter technology is already proving it will help bring more distributed solar more safely to the grid.

    Concern with, and sometimes resistance to, increasing amounts of distributed solar often comes down to how solar-generated electricity flowing IN to the distribution system will affect the lines that have traditionally fed power OUT to consumers. Smart technology that protects feeder systems, only theoretical until recently, has been installed and is now being demonstrated by two teams of utility, academic, and solar industry researchers.

    The Projects

    A $4.4 million DOE SunShot High Solar Penetration initiative grant and $2.7 million contributed by the inverter maker Solectria Renewables and utility partners DTE Energy, National Grid, and Pepco Holdings is funding one project.

    The Electric Power Research Institute (EPRI)-led group is readying real world demonstrations at three large solar installations. DTE has installed an approximately 350 kilowatt inverter at its site. National Grid has two inverters of approximately 500 kilowatts running at one site in its territory and two of about 380 kilowatts at another. Pepco is working at a single site with eighteen inverters of about 100 kilowatts each.

    “The size and number of smart inverters is dependent on the size of the solar,” explained EPRI Technical Executive Brian Seal. All use the same technology and architecture.

    Credit: SunShot EPRI Smart Inverter initiative

    The University of Hawaii’s Natural Energy Institute (HNEI) is leading a smart inverter demonstration focused on residential feeders. It is funded with a $6.1 million Department of Energy SunShot High Solar Penetration initiative grant. A further $6.1 million comes from smart communications pioneers Silver Spring Networks (SSN), Exegin, and inverter makers Fronius, Hitachi, and SMA, as well as from utility partners Maui Electric and Pepco.

    A Fronius inverter is installed with a residential solar system in Maui and a Hitachi device is in place with another in Pepco’s territory, HNEI Project Manager James Rawson said. Each is equipped with SSN and Exegin communications that allow the utilities to control them through AMI infrastructure built through a separate DOE smart grid initiative. Eventually, the HNEI group will install 30 smart inverters in Maui and 10 in the Pepco territory.

    In both programs, advanced inverters have already shown they can connect to the grid and open two-way communication with utility control centers. Within the next year, they will show exactly how much protection they can give feeder lines. Maui Electric and Pepco have been extremely interested and engaged and valuable partners, Rawson said. “We all hear about utility resistance to renewables but that is far from what we’ve seen on this project.”

    Credit: SunShot Hawaii High Penetration Smart Inverter initiative page

    The feeders

    Concerns with distributed energy resources differ, depending on the lengths,architectures, and voltages carried on the feeders, Seal said. But the concerns largely fall into three categories. First, there can be too much voltage. Or the amount of voltage can change too fast.

    “Voltage can vary significantly, and suddenly, like when a large solar installation goes from full sun at one moment to a heavy cloud cover the next,” he said. “The feeder may be able to handle that amount of power but not that much change.”

    Third, the power can be flowing in and out at the same time. “Feeders were designed for power to flow out to customers at the ends of the lines. But solar flows in at the feeders,” Seal said. “That can disrupt the settings of the protection devices.” If system protective devices fault out, it can lead to distribution and transmission system equipment damage and, eventually, bigger trouble.

    Traditional generation, and large solar power plants similarly interconnected to the transmission system through substations, do not cause overvoltage or bidirectional energy flow concerns. But large solar plants can, Seal noted, have problematic voltage fluctuations from the sun’s variability.

    EPRI’s detailed analysis of the hosting capacity of feeders helped shape Common Functions for Smart Inverters, which describes eighteen theoretical ways smart inverters can increase the grid’s hosting capacity for distributed energy resources. The DOE projects will demonstrate that “a real smart inverter on a real power system,” Seal said, can “raise the level of solar generation that can safely be accommodated.” This is increasingly important because the level of solar coming into the system, Seal added, “is no longer insignificant.”

    Credit: SunShot High Penetration Solar Initiative

    Early results

    The EPRI group’s research has shown that smart inverters do not significantly add cost.

    “Solar inverters tend to be very capable devices, almost PC-like in terms of their speed and power and memory,” Seal said. “It is mostly a matter of programming and sending and receiving in a way that is compatible with the utility’s operation’s center.”

    There is “a very high degree of confidence” in the technology, Seal said, noting that California’s Rule 21 covering grid connection is being revised to require smart inverter functionality for solar. And it “speaks volumes” about smart inverter potential that engineers from the different utilities are working collaboratively.

    “Utilities are the ultimate customers,” explained DOE Solar Energy Technologies Chief Scientist Dr. Ranga Pitchumani. “Many want to be part of the solution.”

    “Change can happen to you or you can be part of the change,” DOE Solar Energy Technologies Office Director Minh Le added. “Forward-leaning utilities are embracing the change.”

    Credit: SunShot High Penetration Solar Initiative

    click here for more


    Post a Comment

    << Home

  • >