Slow simulation times, when switching at high frequency

Question

Armando 2015-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/230691-slow-simulation-times-when-switching-at-high-frequency

评论： Omkar Dalvi 2019-9-11

Solver configuration.JPG

Halo everyone, I'm working on a high frequency converter using full bridge Mosfets configuration, with a switching frequency of 20Mhz. What I've noticed is that the higher the frequency, the slower the simulation gets.

For instance: At 20KHz, is simulates much much faster than at 20MHz.

I've attached a print screen of my solver settings.

Does anyone have any ideas why this is happening?

Thanks, Armando.

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Omkar Dalvi 2019-9-11

hie can u help me with a similar circuit. i am confused so as how to get higher frequency output for AC

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Answer 1

Sebastian Castro 2015-7-21

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编辑：Sebastian Castro 2015-7-21

That makes sense! If your frequency is higher, then there are more switching events per second that fire off zero-crossings in the Simulink solver.

It depends on what you're trying to do, though. If you're trying to model a fixed number of cycles, then you can also reduce the total simulation time. For example, 10 cycles at 20 MHz requires 1/1000th of the total simulation time than at 20 kHz.

If you need to simulate for a fixed time range, e.g., 10 seconds, then there isn't much of a workaround for that. Simulation will be slower if your switches go on-and-off 1000 times faster.

EDIT: Are you using SimPowerSystems or Simscape/SimElectronics? If you're using Simscape, I'd try the ode23t or ode15s solvers instead of ode23tb. If you're using SimPowerSystems, keep it as is.

- Sebastian

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davood mansouri 2017-12-18

Dear Sebastian Castro I have simulate inverter in SimPowerSystems. simulation speed is up, but by using a circuit breaker in the simulation it runs very slow. how can I speed up it?

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