| dc.description.abstract | This thesis utilizes a novel control technique, which called state-dependent Riccati equation (SDRE). By using the proposed theoretical analyses framework to efficiently guarantee the preliminary applicability of the SDRE-based control technique, and also implements on a permanent-magnet synchronous motor (PMSM) control drive system to further discuss the concerned topic. According to the research results, the advantage of the proposed framework lies in an equivalent dimension reduction in the system space through an integrated theoretical analyses scope, which successfully remove any unnecessary pre-works before using the SDRE scheme. Specifically, it can be referred to the applicability/solvability-checking before the duration of solving system states at each time instant. From the viewpoint of experimental results, the proposed theoretical analyses framework will have a significant effect to alleviate the main computational burden that caused by the solvability-checking of SDRE, and some further detailed discussions will also being explained and presented in the latest chapter of simulation verification and analyses. In order to make the concerned issue to have a much longer and more unique path, while this thesis introduces a much-less-known but quite competitive method for solving the Riccati equation, whose highly efficient merits are owning to its complex structures. Note that, this method stands out after being tested by tremendous literatures in a wide range of research fields nowadays via its improvement of computational efficiency. By combining this up-to-date method and the proposed theoretical analyses in a same experimental setup that stated in the original reference, it can be found that the overall improvement obviously amounts about 91-93% reduction after the statistics through the whole system. Due to the characteristic of fast system response, the research in this thesis further completely reduces the redundant burden caused by the calculation process, otherwise, these great results can also make more attention from the researchers who have such specific demands in the related fields, thus, they will have more focus on the impact of the proposed results. By the established confidence, we are also looking forward to bring such an enthusiasm from the proposed enhancement to have an outstanding vision in the future. Finally, it is not only focus on a certain degree of influence from the above mentioned; on the other hand, the robustness of the system that associated to such as parameter changes and the efficiency of extending/applying the proposed framework to a variety of system designs (e.g. cross discipline and non-SDRE-based applications) are also considered in the thesis. | en_US |