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PID working with sine wave as reference

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ashish ahir
ashish ahir on 25 Jun 2015
i have seen example of controlling output dc voltage of DC to DC buck converter using PID controller. I want to implement DC to AC converter. I tried using PID controller. Since i am comparing output AC signal(continuously varying) with reference sinusoidal signal, PID controller is not providing expected output. In case of DC to DC, both reference signal was constant. In my case, it is continuously varying sine wave. Can anyone suggest any way to get accurate DC to AC conversion? P.S. Can PID controller work with continuously varying reference signal with high freqency(100Hz)?

Answers (1)

Purushottama Rao
Purushottama Rao on 25 Jun 2015
PI is a common controller normally used in power electroincs for both DC-DC and DC-AC conversions. We have few systems running with PI controller. D term is not used as it adverse the noise. However in few cases, synchronous frame concept is used where the AC signal is transferred to a synchronous frame where it looks like a dc signal. Then PI controller has to handle only the DC component.
I had experinced using PI controllers upto 100Hz without much issues.
ashish ahir
ashish ahir on 30 Jun 2015
It is for 3 phase. Mine is single phase inverter. how can i do D-Q transformation?
Purushottama Rao
Purushottama Rao on 4 Jul 2015
Even for single phase, pseudo transformations are avaialble..pls serth on the web

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