I am a control engineer and also a student who is studying the doctor's degree. I am interested in the disturbance observer now, I need some information about the discrete-time implementation of the DOB . Could anyone give me some advice？Thank U very much 。
Conference Paper On robust stability of disturbance observer for sampled-data...
This might be helpful.
(More details)
Simply we may first design a CT DOB and apply any kind of discretization methods on the CT DOB to get a DT DOB. But, if we use zero-order hold(ZOH) equivalent model(discretized plant), this DT DOB may not be working, because the ZOH model may have 'unstable sampling zeros'.
If you have any further questions or issues related to the paper, please let me know.
Dear Zhang,
You can read this following paper
1-
Discrete-time implementation of disturbance observer based on robust internal-loop compensator framework: Easy-to-implement approach. DOI: 10.1109/URAI.2013.6677381
2-
Robust Discrete Time Disturbance Observer with Finite Control Set Model Predictive Control in UPS System. doi.org/10.1016/j.ifacol.2019.08.154
It is easy to design disturbance observer in discrete mode but the error will be within an error bound. Please clear whether you want to design with the state information or with output information only. State-based designs are very easy while output-based designs are of high interest to date.
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