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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.
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