Aurelio García Cerrada

Active- and reactive-power control for a wind generator connected to the grid using a predictive-integral control and a PI control schemes

This paper investigates the control of the active and reactive power injected into the grid by a variable-speed wind generator. Two different control schemes are studied to achieve a decoupled control of the active and the reactive power. First of all, a classical PI controller designed by means of the pole-placement technique is investigated. Secondly, a predictive-integral controller is realised. The objective of both control schemes has been set to obtain a deadbeat system. The design of these control systems is developed in discrete time and a thorough comparison of both methods is carried out by studying their transient responses, steady states and robustness properties. Simulation results are presented to validate the main contributions of this work

INDIRECT-FIELD-ORIENTATED CONTROL OF AN ASYNCHRONOUS GENERATOR WITH ROTOR-RESISTANCE ADAPTATION BASED ON A REFERENCE MODEL

Abstract This paper studies in detail a method for rotor-resistance adaptation for indirect-field orientated control of induction generators based on the reactive-power reference model. First of all, it will be shown how the adaptation procedure can be made independent of stator frequency and load torque. Secondly, the stability of the adaptation procedure will be demonstrated rigorously by means of Lyapunov theorem. Simulation results using data from two different machines will be presented to validate the main contributions. Finally, the sensitivity of the algorithm to errors in other machine parameters will be investigated.