As a result network equation solutions are sometimes done at intermediate time steps as part of the integration method.
PowerWorld Simulator uses a second order Runge-Kutta integration method. This greatly aids in the initial guess sof the network equation voltages at a time step and helps speed up the simulation.
This essentially models the voltage as a quadratic function of time based on the last three time steps and creates an estimate of what the next voltage will be. When this option is checked, an estimate of the voltage at time step will use the voltage at the previous three time steps to estimate what the next voltage will be. This option can be helpful to avoid small unit oscillations caused by small mismatches.
#Number of buses limit for power world simulator 19 update#
Specify a time in seconds which forces a full network equation update every so many seconds. This option defaults to a value of 10 meaning that the simulation will not abort until 10 consecutively failed network solutions. It is not uncommon for the network solution to then be achieved easily on the next time step's network solution. When running a transient stability simulation, a particular network solution may have a hard time converging and result in oscillating near a solution but not actually achieve a solution to within the tolerance. This option setting only affects the transient stability power flow algorithm and does not affect the power flow model.Ībort after number of failed solutions Added in Version 20. Specify the maximum number of iterations allowed in the transient stability's power flow algorithm. This option setting only affects the transient stability power flow algorithm and does not affect the power flow model. Specify the convergence tolerance used in the transient stability's power flow algorithm. When Using Playin Models Set Initial Hz to First Value Added in Version 20.Ĭhoose this check box to automatically set the initial system Frequency to the initial frequency from the PlayInGen model's frequency PlayIn signal.Ĭommon: Network Equation Solution Options To set the initial condition's frequency differently change this value. Normally, the assumed initial system frequency is the Nominal System Frequency. To change this value, go to the Power Flow Solution General page found under Simulator Options. The value cannot be changed here and is shown for informational purposes only. Set the nominal system frequency in hertz. This contains options for how the actual transient stability numerical simulation is performed. The Power System Model sub-tab is found on the Options page of the Transient Stability Analysis dialog. Transient Stability Analysis Options: Power System Model
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