Its application method and system in a data sampling method and system, and parameter identification

摘要

The present invention relates to a data sampling method: sampling a physical quantity according to a sampling frequency f s ‰¤ f sh , f sn = ¶ max / µ being the upper limit of the sampling frequency; and a data sampling method and system: sampling a physical quantity with a sampling frequency satisfying Nyquist theorem, firstly performing digital low-pass filtering on an obtained sampled sequence, and then re-sampling, the re-sampling frequency f s ‰¤ ¶ max / µ , where µ is the Z-domain error of a sampling system, and ¶ max is the maximum error of an S-domain. The present invention also relates to a parameter identification method and system which firstly adopt the above data sampling method and system to obtain sampled data, and then utilize the sampled data to perform dynamic and/or static parameter identification. The data sampling method and system and the parameter identification method and system of the present invention solve technical difficulties such as relatively large errors in sampled data, digital control instability, and parameter identification failure.