Scheme of Several Surrogate Models Interaction for Electrical Load Simulation

Abstract

The use of surrogate models for simulating the electrical load of power plants is considered to improve the performance of the modeling process. Surrogate models are fast-acting models that reflect only the external behavior of the modeled system, i.e. approximate its external characteristics. It is shown that long-known simplified models obtained using the least-squares identification method can be used to construct such models. To obtain such models, it is proposed to use a new mathematical description, in contrast to the one considered earlier. The models are constructed directly in the form of differential equations represented by vector-matrix equations, rather than using a transition matrix as was done previously. New models not previously considered are also obtained and investigated. A mathematical description of a structurally complex model of the energy system is shown. This model is used to obtain initial transient processes for identifying surrogate models. The derivation of a mathematical description of a surrogate model is shown, its difference from previously obtained models is shown. A multi-model scheme for the joint use of several surrogate models is proposed. For this purpose, in contrast to previous works, it was proposed to use a special switching scheme, which made it possible to form the very concept of a multi-model scheme.