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This paper studies the performance of the Back to Back converter to control the power flow between two interconnected AC systems under unbalance grid voltage and voltage sag conditions. The first one system is considered the electrical grid, and the second one a Double Feed Induction Generator. To maintain the power transference under these disturbances a control-block diagram based on a decupled...
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...
A control scheme constituted by a nonlinear state feedback current controller and a PI voltage controller for a single-phase active multilevel rectifier is designed. The control is based on the system modeled in the d-q synchronous reference frame. Through input-output linearization theory a current controller that decouples the d-q components is obtained. Stability of zero dynamics is verified. Due...
In this paper the bidirectional power capability of a three-phase AC/DC/AC voltage-source converter is studied; based on the input-output linearization control theory, which is applied to the inner current loops that are connected in cascade with the outer loops. Both loops (inner and outer) allow a suitable control of the power flow. The controlled system is linearized and decoupled; based on the...
This article describes the design of an observer-based, robust, linear output feedback controller for the regulation, and output reference trajectory tracking tasks, in switched “buck” converter circuits with completely unknown, time-varying, resistive loads. The disturbance effects of the unknown load resistance are on-line estimated by means of a Generalized Proportional Integral (GPI) observer,...
Single phase back to back (SPBTB) converter is widely used for power transfer in order to increase the performance of electrical power systems; however to take advantage of a SPBTB response it is necessary to avoid over-modulation conditions. This paper deals with an analytical procedure to obtain a SPBTB operating region to guarantee power transfer of each one of the converters of a SPBTB without...
This paper presents a dq0 control scheme for a three-phase four wire shunt active power filter (SAF) based on a three-level neutral point clamped (NPC) inverter. Neutral-point clamped inverter is a widely used topology for utility applications. However, the differential neutral point voltage is fluctuates with different switching states. This phenomenon has to be minimized or disappeared for all power...
This contribution discusses the sensibility of the transient response of a fluid in a pipeline with respect to the existence of two leaks which occur simultaneously assuming that only pressure and flow rate are measured at the extremes of the line. It is shown that the four unknown parameters of the fluid model produced by two simultaneous leaks are identifiable considering the transient response...
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