For models with long time constants such as induction machines and transformers, the transient state lasts a considerable amount of time before steady-state is reached, making the analysis time enormous (Fig. A). In order to shorten the analysis time, performing correction processing using the periodicity of the results and adjusting initial values is effective. JMAG provides [Time Periodic Explicit Error Correction] (TP-EEC) function and [Steady-State Approximate Transient Analysis] function (Table a).
In this document, obtaining steady-state in less time steps using TP-EEC function will be presented.
Fig. a Models with long time constants
Table a Function for obtaining steady-state at an early stage
|Time Periodic Explicit Error Correction (TP-EEC)||– Correction to eliminate error at a specified time period is performed.
– Can be used in a model in which the field varies periodically.
|Steady-State Approximate Transient Analysis||– Given the initial values of the transient response analysis, predicted steady-state values from the power supply are output.
– Can be used in a model where the field varies sinusoidally.
Keywords: transformer, motor, induction motor, rotating machine, time periodic explicit error correction, TP-EEC, steady-state approximate transient analysis, solver control, transient, eddy current, time constant