Frequency Response Estimation using Linear Analysis tools crashes?

Question

SimTec 2018-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/384858-frequency-response-estimation-using-linear-analysis-tools-crashes

评论： MULTAN007 2020-5-7

hello everyone, my objective is to get the frequency response (bode blot) of boost DC/DC converter with peak current mode control. in the open loop both methods works fine, the AC sweep of PLECs and Linear Analysis tools.

Now, I am working on the closed loop a mentioned above, I had encountered a problem of Algebraic loops that does not converge my simulation, after adding the unit delay for my feedback the issue is solved.

so now I have some questions and issues related to the linear analysis tool:

1- is it correct to use the input-perturbation(Verr) and the open-loop output(Vout) to obtain the frequency response of the closed loop or I must use another input/output elements?

2-I have used the simulation snapshot to linearize my simulation in the linear analysis tool, I have as well used the sinestream input. however, my simulation crashes and shows this error message:

---------------------------------------------------------------------------------------------------------------------- In "frestimate(modelname,op,io,in)", the input signal "in" is a frest.Sinestream signal which has parameter values for "Frequency" and "SamplesPerPeriod" such that it inherently has multiple sample times. Using such an input signal requires that samples rates belonging to the Simulink signals where your linearization input and output points are located are either continuous or fixed in minor time step and the linearization I/O io(1) does not satisfy this requirement. Consider either changing the sample time of Simulink signal where io(1) is located to continuous sample time or using frest.createFixedTsSinestream utility to create a sinestream signal that has a single sample rate. ---------------------------------------------------------------------------------------------------------------------

in this message it suggests me to fix the issues using 02 methods which I don#t know how to apply. -how can I change the sample time of Simulink signal where io(1) is located to continuous sample time or - using frest.createFixedTsSinestream utility to create a sinestream signal that has a single sample rate.for this one, is it the located in the creating the input signal?

thanks in advance for your help