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Example Projects

 

Recent projects:

Battery Energy Storage System project

  • NPPT responsibilities:
    • Full interconnect study for the BIS
    • Design, analysis, characterization, implementation assistance, and monitoring of grid support controls for the battery-inverter system (BIS), including detailed transient modeling
    • Development of detailed transient models of all components of the BIS, and the power system into which it is to be installed, including dynamic load models
    • Detailed interconnect study, including investigations of potential TOV during LG faults, protection interactions, stability, and control capability of battery-inverter system (BIS)
  • Primary simulation tools:  MATLAB/Simulink, PSS/E
  • Status:  currently active.

Battery Energy Storage System project

  • NPPT responsibilities:
    • Design, analysis, characterization, implementation assistance, and monitoring of grid support controls for the battery-inverter system (BIS), including detailed transient modeling
    • Development of detailed transient models of all components of the BIS, and the power system into which it is to be installed, including dynamic load models
    • Detailed interconnect study, including investigations of potential TOV during LG faults, protection interactions, stability, and control capability of battery-inverter system (BIS)
  • Primary simulation tool:  MATLAB/Simulink
  • Status:  currently active.

Temporary Overvoltage Project

  • Project purposes:
    • To identify and characterize the physical mechanisms that cause temporary overvoltage during single-phase line-to-ground (LG) faults on feeders with PV penetration
    • To determine the effectiveness (or lack thereof) of several potential mitigating strategies
  • NPPT responsibilities:
    • Development of detailed models of inverters and power systems, including dynamic load models, for investigation of ground fault overvoltage (GFO) and load rejection overvoltage (LRO)
    • Continuing development of fundamental understanding and theoretical and simulation tools on GFO and LRO
  • Project update (August 2013):
    • Published a paper at the Western Protective Relay Conference on inverters and GFO; see Publications
    • Presently working with the Forum for Inverter-Grid Interaction Issues (FIGII), a grass-roots group of manufacturers working toward workable solutions in inverter grounding, and with multilple industry and government partners
    • NPPT focus areas:
      • Grounding transformer design for PV plants
      • Investigation of inverter behavior during and role in GFO and LRO, and identification and evaluation of mitigating strategies
      • Investigation into the LRO/GFO behavior of non-PV inverters (i.e., inverters for battery systems, STATCOMS, etc.)
  • Primary simulation tool:  MATLAB/Simulink
  • Status:  ongoing.

SEGIS-AC

  • DoE-sponsored project led by Advanced Energy Industries of Bend, OR.  Project partners:  NPPT; Portland General Electric (PGE); Schweitzer Engineering Laboratories (SEL).
  • Dates:  starting in late 2011; renewable for three years.
  • NPPT responsibilities:
    • Continuing work from the PV Powered SEGIS project (described below) on the NPPT-developed and SEL-developed synchrophasor-based island detection schemes.
    • Development of new synchrophasor-based capabilities at the distribution level.
    • Reporting and results presentation.
    • Was a full partner in creation/writing of the proposal.
  • Status: completed.

Solar Energy Grid Integration Systems (SEGIS) Project

  • DoE-sponsored project led by PV Powered of Bend, OR.  Project partners:  NPPT; PGE; SEL.
  • Dates:  2008-2011.
  • NPPT responsibilities:
    • Identified early in the project the need for a new island detection scheme that would be applicable at high PV penetration levels.  Conceived and developed an all-new synchrophasor-based island detection scheme and took the concept from blank white paper to initial field trials in the three years of this project.  The concept appears highly promising.
    • Thoroughly characterized, via modeling and experiment, an existing synchrophasor-based island detection technique invented by SEL outside of SEGIS.  This technique, the Wide-Area Method (WAM), was found to be highly effective.
    • Developed a set of irradiance forecasting tools, in collaboration with the Collaborative Institute for Meteorological Satellite Studies (CIMSS) at the University of Wisconsin-Madison.
    • Modeled and extensively characterized three PV maximum power point tracking algorithms, including a new one developed by PV Powered.
    • Reporting and results presentation.
    • Was a full partner in creation/writing of the proposal.

SEGIS Project

  • DoE-sponsored project led by FSEC, Cocoa, FL.  Project partners:  NPPT; Satcon; Lakeland Electric; SunEdison; Sentech.
  • Dates: 2008-2011.
  • NPPT responsibilities:
    • Performed detailed and extensive electromagnetic transient modeling of power line carrier communications (PLCC) for island detection on multiple feeders.
    • Assisted in technology selection, signal design, and collaboration with PLCC vendors.
    • Reporting and results presentation.
    • Participated actively in writing the proposal.

Project to determine the ultimate viability of passive island detection

  • Project sponsor:  Xcel Energy, through its Renewable Development Fund
  • Dates:  2009-2012
  • NPPT is the lead organization.  Subcontractors:  Enernex Corp (during the initial phases in 2009 and 2010).
  • Project purpose:  to conclusively determine whether it is possible for passive island detection schemes to meet the IEEE 1547 test and provide reliable island detection without false trips.

Pacific Northwest Smart Grid Initiative:  Smart Grid Demonstration Project

  • Dates:  2009-2012.
  • NPPT responsibilities:
    • Key lead role in initial microgrid engineering, including detailed modeling to assist in design of protection, controls, power electronics, and communications.
    • Coordination role between project partners from disparate fields.
    • Support for component and system testing.
    • Support for microgrid deployment and commissioning.
    • Ongoing support for data analysis.

 

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