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Lugo (Version 4.1) is a minor upgrade of GridLAB-D planned for October 2018. Changes and improvements in Lugo were focused primarily on the deltamode transient analysis (microgrids) and FNCS/HELICS integration, with several minor features and fixes incorporated.

New Capabilities

  • FNCS and HELICS interfaces incorporated
    • Several bug fixes and improvements to the interfaces
    • Includes deltamode capabilities with FNCS/HELICS
  • MySQL module
    • Improved writing mechanism to reduce overhead
    • Several usage fixes
  • Generator module
    • Cleaned up several deprecated objects that had no functionality
    • Inverter has had significant improvements to its functionality
      • Deltamode improvements for better transient simulations
        • Ability to operate as a voltage source inverter and be grid forming
          • Operate in either isochronous or droop mode
        • Droop controller for f/P and V/Q in grid following implementations
        • Ramping limits to reflect power electronics slew limitations
      • Improvements to the inverter IEEE 1547 and IEEE 1547a functionality
      • New Volt/Watt mode
    • Diesel generator has had improvements to its functionality
      • Simplified steady state model to remove inaccurate model
      • Simple overload checking incorporated
        • Deltamode improvements for better transient simulations
          • Added convergence limits for voltage to help control deltamode simulation intervals
          • Simplified set point variables for frequency, voltage, real power, and reactive power dispatch outputs
          • Implemented new control modes for resiliency analysis
            • Constant reactive power dispatch mode
            • Constant real power dispatch mode
            • CVR method for transient reduction, per this paper
          • Simplified fuel use and emissions calculations
  • Powerflow module
    • Fixes for tape-shielded cables
    • Multiple islands supported, including the ability for an island to "fail" and not terminate the simulation
    • Tiered-TOU pricing fixed for triplex_meter
    • Induction motor models
      • Single-phase and three-phase implementation
      • Deltamode support
      • Simple protection schemes (thermal trip and under-voltage contactor)
    • AMI-like fields for meter and triplex_meter
    • fault_check incorporated SINGLE_DEBUG to help track down feeder topology problems
    • Deltamode capability improvements
      • Capacitor objects now can update in deltamode
      • Regulator objects now can update in deltamode
      • Separate integration method selections for series vs. shunt impedance and in-rush calculations
    • Improved GFA functionality in node-type objects
  • Tape module
    • Deltamode support for group_recorder
    • New object - metrics_collector
  • Build/Support
    • Migration to MSYS2-based environment for Windows compiling
    • Updated incorporated superLU MT version to 3.1
    • Updates to build numbering to better reflect GitHub hash system
    • Migration of several objects to GLD API
  • Tickets (tickets relating specifically to the development of this version)

See also