H [infinity] controller synthesis for sampled-data systems and nonlinear systems
In this project, we first investigate the H∞ synthesis problem for a class of sampleddata control systems. We consider both Zero-Order Hold (ZOH) and Generalized Sample and Hold Functions (GSHF). Explicit formulae for such Hoc sampled-data controllers in case of linear time-invariant plants are giv...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2011
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/42742 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | In this project, we first investigate the H∞ synthesis problem for a class of sampleddata
control systems. We consider both Zero-Order Hold (ZOH) and Generalized Sample and Hold Functions (GSHF). Explicit formulae for such Hoc sampled-data controllers in case of linear time-invariant plants are given.
Secondly, we examine the robustness of the Hoc controlled systems. It is shown that the sampled-data H∞ controller cannot achieve the same system's performance
as the continuous-time controller does. However, by varying the sampling
period, we show that sampled-data H∞ controller can reach a robustness level close
to what a continuous-time H∞ controller can achieve when the sampling period
is small enough. Furthermore, with the proposed GSHF-based controller, better
robustness is obtained for the H∞ synthesis system in comparison with the ZOH-based
controller. |
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