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The aggressive development of new technologies used in aerospace electric power systems imposes the finding of new and advanced ways to validate and verify the requirements allowing the use of these new technologies, their validation and verification along with implementation and integration. The objective of this paper is to present the simulation model created for a large commercial airplane Secondary Electric Power Distribution System (SEPDS). The system's simulation is performed using Mathworks MatLab and is being built around the system requirements. The model allows the simulation of distinctive subsystems or components (e.g. Micro-controller, CAN bus, AFDX bus, control logic, FPGA logic) with the associated operational software and built in test. The simulation model is modular, recreating the modular architecture of the SEPDS. The model reproduces the full functionality of the SEPDS (power distribution function, protection function, control, communication).

The paper presents methodology of early system validation for architecture of a modular controller through modeling and rapid prototyping techniques in a real time operating environment. The real time operating environment was used in development of a secondary electric power system (SEPDS) with solid state power controller (SSPC) technology. The System consists of multiple Line Replacement Units (LRUs) distributed across the aircraft; each LRU implements distributed controls with a modular configuration, named Line Replaceable Modules (LRMs). During the phase of redesign of the control architecture a real-time control using XPC target was developed. The challenges include interfacing the re-designed LRM with the existing backbone hardware and maintaining interface consistency for seamless exchange of the old hardware with new one.