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Comparison of computing time with and without ARTEMIS The tests have been carried using test example given in Kundur’s book on power system taken from [1] Figure 1: Kundur's Power System example The following setup is used: Intel Xeon CPU W3550 @ 3.07 GHz, 1.0 Gb of RAM. Matlab 7.9.0 (R2009b) Simulink 7.4 SimPowerSystem 5.2 Artemis Blockset 5.2.3 Table 1: Simulation time with and without ARTEMIS (for simulation of 1 second) Solver Variable step Ode45 (Dormand-Prince) Variable step Ode15s Variable step Ode23tb ARTEMIS Art5, Ts = 10e-6 s ARTEMIS Art3hd, Ts = 10e-6 s Total Execution Time Taken (sec) 627.71 s 25.25 s 33.87 s 45.57 s 43.30 s Fig. 1: Trend displays for the currents of Generator 1 and Generator 2, using Matlab ODE 15s and ARTEMIS Fig. 2: Trend displays for current and voltage in load 1, using Matlab ODE 15s and ARTEMIS Fig. 3: Trend displays for current and voltage in load 2, using Matlab ODE 15s and ARTEMIS Remarks: - When taking a sampling period greater than 50E-6 seconds, Artemis cannot solve the system and the following error message is displayed: Error reported by S-function 'fts2dla' in 'Kundurs_system2_ARTEMIS/Subsystem/Distributed Parameters Line/Artemis DPL1/separated_model1/delai/recur_delai2/S-Function': Equivalent direct feedthrough detected. Select shorter time step or longer distributed parameter lines - The simulation is not working if the powergui parameter Simulation type is not set to Continuous at the beginning of the simuulation. The following error message is displayed: Trouble solving algebraic loop containing 'Kundurs_system2_ARTEMIS/Subsystem/Synchronous Machine pu Standard1/Electrical model/Discrete/Vfd/Switch' at time 0. Stopping simulation. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances). References: [1] Nicolas Léchevin, Camille Alain Rabbath and Paul Baraco, “Distributed Real-time Simulation of Power Systems Using Off-the-shelf Software”, IEEE Canadian Review Summer / Été 2001.