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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.

Sliding Mode Control with Fuzzy Tuning for Position Tracking of an Electro-Hydraulic Actuator

Antić D., Nikolić V., Mihajlov M., Aleksić K.

Machine Dynamics Problems

2002

Vol. 26, No. 1

81-93

This paper considers the position control problem of an electro-hydraulic actuator subjected to parameter uncertainties and an external disturbance. The system is described by a comprehensive model that accounts for nonlinearities and friction effects. Friction in the hydraulic cylinder and load variations are taken into account as the external disturbance. The variable structure control with a sliding mode is used in the first step of the controller design. In order to overcome known drawbacks of the sliding mode control, fuzzy logic is applied. The simulation results show good tracking performance and strong robustness.