Abstract: A method is disclosed for exporting a black-box model of an inverter-based resource or plant from a first software platform for use by a second software platform. The method comprises simulating, using the first software platform, instantaneous time-domain responses of the inverter-based resource or plant to respective conditions defined by a script, according to the black-box model. The method may further comprise generating training data from the instantaneous time-domain responses and the respective conditions. The method may further comprise, with the training data, training a machine learning model to model the inverter-based resource or plant, wherein the trained machine learning model is transparent as to its inner workings. The method may further comprise generating software code that represents the trained machine learning model in terms of software code usable for defining a custom model of the inverter-based resource or plant in the second software platform.