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A two stages robust Generalized PI feedback controller for a single-phase active multilevel rectifier is proposed. The controller is based on the system modeled in the d-q synchronous reference frame. Based on input-output linearization theory a current controller that decouples the d-q components and compensates unknown perturbations is obtained. Performing a transformation of the system, stability...
The robust stabilization of a voltage-controlled three-pole active magnetic bearing (AMB) system is considered in this paper. The system could suffer both matched and mismatched uncertainties from a variety of sources such as unmodeled magnetic forces due to flux leakage and parametric uncertainties due to manufacturing and assembly errors. The system represents an interesting example that is not...
Three-phase four-leg inverter has powerful ability to effectively treat unbalance and nonlinear loads, which outputs three phase symmetrical voltages. A novel control scheme with PD output voltage instantaneous-value feedback inner loop for voltage PID is proposed based on the model of three-phase four-leg inverter. The inner loop is designed to improve dynamic performance and the voltage external...
In this paper we propose a new control scheme for the doubly-fed induction machine (DFIM) that offers significant advantages, and is considerably simpler, than the classical vector control method. In contrast with the latter, where the DFIM is represented in a stator flux-oriented frame, we propose here a model with orientation of the stator voltage. This allows for an easy decomposition of the active...
In this paper, a comparative analysis of two nonlinear control schemes proposed for a single ended primary inductance converter (SEPIC) power factor corrector (PFC) is presented. The SEPIC converter, compared to conventional buck or boost ones, allows a low current ripple at the input for a relatively low level of the DC-bus voltage. Consequently, the high frequency filter needed at the AC-side of...
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