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A University of Washington Workshop

Grid-forming Inverters for Low-inertia Power Systems

Changing generation, consumption, delivery, and operational paradigms are transforming bulk power systems. Rapid growth in the adoption of renewable resources, electric vehicles, and demand response calls for improved methods to model, analyze, and control power-electronics-based energy conversion units that interface these technologies to the bulk grid. This workshop aims to bring together leaders from academia, industry, and national laboratories to identify challenges and propose solutions for future low-inertia power systems that will be dominated by grid-forming inverters. The workshop agenda will focus on the interrelated topics  of optimal operation and control of low-inertia power systems, inverter controls, and the associated socio-economic and regulatory concerns.

Monday April 29
9:00am-9:10am: Welcome Remarks – Daniel Kirschen (UW)
9:10am-9:30am: Overview of Workshop Objectives – Brian Johnson (UW)
9:30am-10:00am: Mark Ahlstrom (VP of NextEra, President of Energy Systems Integration Group)
— The Grid as a Hostage of Its History: The many ways that grid forming inverters will change power system
10:00am-10:30am: Guohui Yuan (DOE, Solar Energy Technology Office, Program Manager)
— Future System Impact of DOE Solar Grid Integration Research
10:30am-11:00am: Break
11:00am-11:30am: Yilu Liu (ORNL)
— Three US Interconnection High PV Model Development and Inertia Estimation for Inverter Control
11:30am-12:00am: Greg Kern (Outback Power Systems)
— Inverter Stacking for Residential Microgrids
12:00pm-1:30pm: Lunch
1:30pm-2:00pm: Marcello Colombino (NREL)
— The Effect of Transmission-line Dynamics on the Stability of Grid-forming Inverter Control
2:00pm-2:30pm: Aranya Chakrabortty (NCSU)
— A Passivity-Based Globally Stabilizing PI Controller for Primary Control of Radial Power Distribution Systems using Solid-State Power Converters
2:30pm-3:00pm: Wei Du (PNNL)
— Using Grid-Forming Inverters to Improve Transient Stability of Autonomous Microgrids and Dynamic Distribution Systems
3:00pm-3:30pm: Group Discussion [Moderators: Yashen Lin, Bob Lasseter]
3:30pm-4:00pm: Break + Group Photo
4:00pm-4:30pm: Deepak Ramasubramanian (EPRI)
— Improved Positive Sequence Converter Models for Inverter-based Resources and Impact on Stability of the Bulk Power System
4:30pm-5:00pm: Ben Kroposki (NREL)
— Summarizing the Technical Challenges of High Levels of Inverter-based Resources in Power Grids

Tuesday April 30
9:00am-10:00am: Morning Session on European Systems
9:00-9:20am: Philipp Strauss (Fraunhofer) – Video Link
9:20-9:45am: Thibault Prevost (RTE France) – Video Link
9:45-10:00am: Kjetl Uhlen (NTNU) – In-person
10:00am-10:30am: Break
10:30am-11:00am: Duncan Callaway (UC-Berkeley)
— Understanding Stability of Low-Inertia Systems
11:00am-11:30am: Donny Zimmanck (Enphase)
— Residential Microgrids: Challenges and Opportunities with Turning Neighborhoods into mini ISOs
11:30am-12:00am: Brian Johnson (UW)
— Modeling and Design of Inverter-based Systems
12:00pm-1:30pm: Lunch
1:30pm-2:00pm: Group Discussion [Moderators: Joe Eto, Abraham Ellis]
2:00pm-2:30pm: Francesco Bullo (UCSB)
— Transient Stability in Droop-Controlled Microgrids with Frequency and Angle Difference Constraints
2:30pm-3:00pm: Scott Manson (SEL)
— Protection and Control Challenges with Inverter Control Methods
3:00pm-3:30pm: David Porter (S&C)
— Communication Between GFM Inverters – 20 years of S&C experience
3:30pm-4:00pm: Chris Smith (Lincoln Labs)
4:00pm-4:15pm: Daniel Kirschen + Bob Lasseter (Closing Remarks)

Organizing Committee:

  • Brian Johnson (U Washington)
  • Yashen Lin (NREL)
  • Joe Eto (LBNL)
  • Bob Lasseter (U Wisconsin)
  • Abraham Ellis (Sandia)
  • Daniel Kirschen (U Washington)