Abstract:
The subspace identification problem of fractional order time-delay system using frequency responses is studied. A new identification method,which combines the differential evolution(DE) algorithm and subspace method in frequency domain,is presented.The DE algorithm is used to search the optimal fractional differential order and time delay parameters. While,for fixed fractional differential order and time delay,subspace method is applied to obtaining the state space model. The efficiency of the new algorithm is proved via simulation tests.