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This work presents the direct current control scheme of shunt active power filter with an LCL output filter of a single phase energy distribution system feeding nonlinear loads connected at the PCC using an LQR. The model of SAPF-LCL is carried out in D-Q frame and the controller with added integral action is designed to compensate harmonics of the nonlinear loads and to keep the DC bus voltage at...
This paper investigates the impact of rotor inter-turn short circuit on the radial magnetic flux density of a large hydro generator. A numerical model based on advanced 2D finite element analysis is used for computing the magnetic flux density with and without inter turn short circuit in rotor winding. At first, the simulated air gap flux density is compared to measurement in order to validate the...
In this paper a simple control method involving new insertion index selection scheme for control of Modular Multilevel Converters (MMC) is proposed. In contrast with classical closed-loop methods, where all available arm voltages are measured and used in the generation process of insertion indices, this method uses available average voltage, i.e. the arithmetic mean of available upper and lower arm...
The aim of this paper is to present the design of a linear quadratic regulator (LQR) based on optimal control of single phase grid connected inverter with an LCL output filter used in solar applications. The converter model is set in the D-Q rotating reference frame where integral action is added to the grid current in order to cancel steady state error. The controller is tested in steady state, dynamic...
The aim of this paper is to introduce power quality added function to the standard Vienna rectifier in order to compensate reactive power and to cancel current-type harmonics drawn by nonlinear loads connected to the same point of common coupling. A theoretical investigation that demonstrates the ability of such topology to compensate harmonics and limited reactive power is first presented. Then,...
This paper deals with the modeling, analysis, control and simulation of a doubly-fed induction generator (DFIG) driven by a wind turbine. This grid connected wind energy conversion system (WECS) is composed of DFIG and two back-to-back PWM voltage-source converters in the rotor circuit. A mathematical model of the machine, derived in an appropriate dq reference frame is established. The grid voltage...
This paper presents the design of a Linear Quadratic Regulator (LQR) with Integral action (LQRI) applied to a grid connected wind energy conversion system (WECS) based on squirrel cage induction generator (SCIG) with full-capacity power converter (WECS-SCIG). The controller is used to achieve speed regulation for maximum power extraction from the wind turbine, DC bus voltage regulation and to keep...
This paper presents the design of a Linear Quadratic Regulator (LQR) with Integral action (LQRI) applied to a wind energy conversion system (WECS) based on doubly fed induction generator (DFIG). The controller is used to achieve speed regulation for maximum power extraction from the wind turbine, DC bus voltage regulation, to make the machine draw its magnetizing current only from the stator and to...
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