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Change history for MATPOWER-Natural Gas (MPNG)

28/04/2022 (Changes included in released version 0.99beta)

  • Addition of unit commitment as an input parameter. Extra field connect.power.UC

  • Addition of inter-temporal power ramp constraints. Extra field connect.power.ramp_time for setting generation ramp-times.

  • Improved nargout checking in wey_approx.m for passing only needed data based on Jacobian and Hessian evaluation calls from mpng.m

  • Redefinition of the default region of approximation of Weymouth's equation (Pi*), according to a percentage of the pipeline's maximum flow.

  • Addition of a new optional field mgc.wey_percent for allowing the user to specify a different approximation region for Weymouth's equation (Pi*).

  • Temporal workaround for allowing compressor ratios to be lower or equal to 1.0 in order to model turboexpanders (i.e compressors with negative power consumption, that is, positive generation). Thanks to a question from Roman Korab.

  • Minor fix to ensure that actual nodal gas demand in mgc.node.dem matches total gas demand in mgc.node.info(:,GD).

  • Fixes in per unit conversion of some quantities.

  • Release of Example3.m. It shows MPNG's performance taking turboexpanders into account.

  • Release of Example4.m and connection_pg_case118.m. This example simulates the 118-bus & 48-node power&gas system over a 24-hour horizon and tests the new MPNG's features regarding the assessment of given unit commitment schedules and start-up/shut-down generation ramps.

  • A new option has been enabled in all Examples for allowing passing the initial point contained in power&gas cases to the solver.