Research on Modeling and Simulation of Integrated Energy System Platform Based on OpenModelica

Abstract

Integrated energy-system models become difficult to reuse when electrical signals, thermal-fluid states, supervisory logic, and evaluation variables are coupled through inconsistent interfaces. This paper presents an OpenModelica platform with unit-explicit cross-domain connectors, graphically encapsulated component models, and a reusable library for renewable generation, conversion, and storage. The thermal loop employs Modelica.Fluid ports and a temperature-dependent SolarSalt medium, while the wind and photovoltaic components expose available, delivered, and curtailed power to support source-level curtailment feedback from the energy-management system. A DASSL-based workflow is applied to a full-year Dunhuang case and complementary parameter-variation cases. The annual simulation maintains complete park electric-load supply, achieves a heat-load satisfaction rate of 90.16%, and yields an electric LCOE of 0.307 CNY/kWh. Statevariable and sensitivity analyses indicate that renewablesource and battery sizing govern electrical absorption and economics, whereas winter thermal-storage availability and heat-side capacity constrain thermal reliability. The platform therefore links reusable Modelica implementation with long-horizon system evaluation without requiring topology-specific reformulation.