Showing papers by "Hadi Y. Kanaan published in 2010"

LQR with integral action controller applied to a three-phase three-switch three-level AC/DC converter

Abstract: This paper presents a Linear Quadratic Regulator with Integral action (LQIR) applied to the three-phase three-switch three-level boost-type Vienna rectifier. The design of the controller is based on the small-signal model of the converter, which is developed in the dq0 rotating reference frame using the state-space averaging technique along with the linearization process. This controller is designed to regulate the DC bus voltages, ensure low THD of line currents and compensate the reactive power. While the standard linear quadratic regulator provides only proportional gains, the integral action is added to cancel the steady-state errors in the control loop. This is done by extending the state vector to include the integral of the source currents dq0 components, the overall output voltage and the DC load unbalance. The controller is tested using Matlab/Simulink, considering successively the cases of a balanced load, an unbalanced load and mains voltages disturbances. The obtained results have shown high performance compared to other control techniques applied to this same topology.

Three-phase rectifier with an active current injection and a single high-frequency inductor

Abstract: This paper proposes a new three-phase power factor correction rectifier using current injection technique. This topology uses two active networks: an injection network composed by three bidirectional switches operating at low frequency and a current shaping network consisting of two high frequency switches and only one inductance. An input current total harmonic distortion (THD) of 8.6% and a high power factor were obtained at a load of 61 Ohms. Simulation results will consolidate the proposed circuit study.

H ∞ robust control applied to the three-phase/switch/level (VIENNA) rectifier

Abstract: This paper presents the H ∞ robust control law elaborated on the basis of a state-space averaged model of the Vienna rectifier, expressed in the synchronous rotating frame. A control scheme is designed by using the steady-state and dynamic models of the Vienna rectifier that are derived by means of a local linearization around the nominal operating point. The proposed robust control law is then verified numerically through a digital implementation of the converter in the Matlab/Simulink framework, using the switching function approach. Simulation experiments are finally carried out in order to test and verify the tracking and regulation performance of the H ∞ control law, as well as its robustness towards load or mains source disturbance. For the same operating conditions, the performance of the robust control law is analyzed in terms of line currents Total Harmonic Distortion (THD) and DC voltage regulation.