Presentation on theme: "Overview of Circuit Simulation Programs ECE 546 DIGITAL COMPUTATIONAL TECHNIQUES FOR ELECTRONIC CIRCUITS January 8, 2008 Oleg Wasynczuk."— Presentation transcript:
Overview of Circuit Simulation Programs ECE 546 DIGITAL COMPUTATIONAL TECHNIQUES FOR ELECTRONIC CIRCUITS January 8, 2008 Oleg Wasynczuk
Need for System-of-Subsystems Approach Complex engineered systems such as aircraft, modern automobiles, or the terrestrial electric power grid involve a broad spectrum of technologies and interactive subsystems that must work synergistically in order to operate properly Inter-dependencies between subsystems are becoming more and more prominent
When user starts model, Simulink applies selected integration algorithm to approximate solution at discrete but not necessarily uniform instants of time General Multi-step Formula Implicit algorithms require solution of nonlinear equation (dimension = number of states) at each time step. Newton- Raphson iteration generally used. Explicit if
System-Based Approaches Stiff System: A system with both fast and slow dynamics Stiffly Stable Integration Algorithm: the ability to increase the time step after fast transients subside Stiffly Stable Algorithms are implicit!
DHS Definition Synchronized interconnection of any number of dynamic subsystem simulations Developed using any combination of programs/languages Implemented on: Single computer/workstation/supercomputer Local area network (Intranet) Wide area network (Internet)
Use “best” language for each component/subsystem Proprietary information protected Super-linear increase in computational speed across a network of desktop computers No need to translate models into common language Legacy code can be used directly Conducive to team design/analysis Remote interconnection Eliminate need to develop average-value models for system stability assessment Real-time (hardware-in-the-loop) capability for some systems System Integrator(s) do not have to be familiar with the language(s) used to create subsystem simulation(s) Key Advantages of DHS
More-Electric Aircraft Power System Optimum Allocation