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This paper proposes a fuzzy-logic-controlled superconducting magnetic energy storage (SMES) scheme for the stabilization of grid-connected wind-generator systems. The control scheme of SMES is based on a sinusoidal pulsewidth-modulation voltage-source converter and a two-quadrant dc-dc chopper using an insulated-gate bipolar transistor. A comparative study(More)
In this paper, a design fuzzy logic controller for a variable speed permanent magnet wind generator connected to a grid system through a LC-filter is proposed. A new current control method of grid side conversion is developed by integrating the fuzzy controller, in which both active and reactive power, delivered to a power grid system, is controlled(More)
Since a superconducting magnetic energy storage (SMES) unit with a self-commutated converter is capable of controlling both the active and reactive power simultaneously and quickly, increasing attention has been focused recently on power system stabilization by SMES control. In this study, a fuzzy gain scheduled supplementary control scheme with SMES unit(More)
This paper presents a field oriented direct torque control system in permanent magnet synchronous motor (PMSM) which controls torque directly as output. A PWM inverter-fed PMSM control system has been driven by field oriented control algorithm without chattering by sliding mode control. The validity of the proposed method is confirmed by simulation results
This paper analyzes the influence of communication delays introduced in online calculation of the global input variable of the fuzzy logic controller for braking resistor (BR) switching on the transient stability of a multi-machine power system. The time derivative of the total kinetic energy deviation (D) of the synchronous generators is used as the global(More)
Hydrogen production using wind power generation system is very effective for solving the energy supply problem in the future. Many strategies have been proposed for the operation of a grid-connected wind farm. But operation method of stand-alone wind farm has not been studied sufficiently so far. There are many places with good wind condition but without(More)
A new control strategy for improving fault ride-through capability of wind farms composed of fixed and variable speed wind generators has been proposed, in this study. In this new control scheme, a small series dynamic braking resistor (SDBR) is used in the stator circuit of doubly fed induction generator (DFIG) along with DC-chopper braking resistor.(More)