Methods for scaling a physical based CHP model for HIL simulation of smart combined grid systems
In this contribution, a model-based method for analysing and designing energy systems comprising the electrical, thermal and chemical domain is presented. Beside the energy generation and consumption, the bidirectional coupling between all energy domains is considered, as well. This method is an adapted variant of the so called Hardware-in-the-Loop simulation where virtual energy components are combined with geographically distributed real energy components. In order to integrate the real components with minimal instrumentation efforts, measured quantities are included as information flows, only, while the physical power flows are connected to local available grid structures. The virtual energy components are represented by real-time capable models describing their physical behaviour. In this contribution, a CHP unit is described as a virtual energy component. The modelling approach is based on a time domain approach using state variables of the multiple domains to describe the dynamic behaviour. Afterwards, the model is parameterized by datasheet specifications and measurement data of several CHP units with different power ratings. Based on these results, a method for scaling the proposed CHP model is presented. Especially for parameter studies, this method allows a simple adaption of a general parameterized CHP model. Moreover, a method for scaling such models with respect to the modelling depth is proposed and exemplarily applied to the electrical generator of the CHP model. This scaling method enables the model adaptations for different simulation purposes like detailed investigations of single structures and holistic investigations of large combined grid systems.