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Synthesis of H2 Controler for VSC-HVDC Terminal Using LMI

Aleksić K., Nikolić V.

Machine Dynamics Problems

2007

Vol. 31, No. 1

5-13

In this paper an approach to designing controller for a VSC HVDC terminal which is robust over a range of operating points is presented. The operating range of the terminal is first characterized as an uncertainty region around a linear nominal model using the operating points of a non-linear model. Linear fractional transformation (LFT) uncertainty model is constructed using a technique based on the singular value decomposition. An LMI based formulation is then used to synthesize controller which optimizes the performance over a range of operating conditions. Numerical simulation confirms that the designed controller achieves good trade-off between the robustness and performance on the non-linear model.

A Double Input - Quadruple Output Adaptive Controller for the Active Headrest System

Pawełczyk M.

Mechanika / Akademia Górniczo-Hutnicza im. St. Staszica

2003

T. 22, z. 3

367-374

A system known as active headrest, generating the so-called zones of quiet at the ears of a person sitting in a chair is considered. It is shown that zones of highest noise reduction generated by a classical double input - double output control system do not reach the ears. To extend the zones four secondary sources, one located over another for each channel, are applied. The error microphones, one for each channel, are mounted between respective sources. Ali the components are arranged not to annoy the user, what impacts system performance. Internal model control with Filtered-x LMS algorithm is employed. Obtained results are presented graphically in the form of surfacial distribution of reduction areas. They confirm the expectations that the zones of high reduction significantly extend comparing to the double input - double output control system and really reach the ears, even in case of practical head movements.