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This paper Investigates the performance of direct power control strategies both steady state and transient applied to doubly fed induction generator (DFIG). These methods directly track stator active and reactive power variations within a fixed sampling period. Simulations are performed using detailed models in Simulink/Matlab. Transient performance and steady state operation of the DFIG are illustrated.
This paper develops a comprehensive mathematical steady-state fundamental-frequency model of the Type-3 wind driven unit, i.e., a doubly fed asynchronous generator (DFAG) and its associated converter system, for three-phase power-flow analysis. First, a novel steady-state, sequence frame-based model of the generic Type-3 unit, to represent 1) the control capabilities and 2) the operating limits of...
An intelligent control stand-alone doubly-fed induction generator (DFIG) system using proportional-integral-derivative neural network (PIDNN) is proposed in this study. This system can be applied as a stand-alone power supply system or as the emergency power system when the electricity grid fails for all sub-synchronous, synchronous and super-synchronous conditions. The rotor side converter is controlled...
In this paper, a robust field-weakening control strategy for IPMSM drives is proposed to achieve fast response and minimum copper loss. First, the classification of three operation regions for positive speed operation is adopted. It is seen that current limit and voltage limit will affect the maximum torque capability and minimum copper loss operation. Second, in order to achieve minimum copper loss...
The Brushless Doubly-Fed Induction Generator (BDFIG) shows commercial promise as replacement for doubly-fed slip-ring generators for wind power applications by offering reduced capital and operational costs due to its brushless operation. In order to facilitate its commercial deployment, the capabilities of the BDFIG system to comply with grid code requirements have to be assessed. This paper, for...
Traditional wind power generation grid-connected methods have a phenomenon of high stator current. Vector Control strategy of grid connection makes it improved. But Vector Control strategy of DFIG depends highly on the parameters. In order to get a flexible grid-connection and better robustness, this paper considers the Direct Power Control (DPC) technique which is used in doubly fed induction generator...
This paper compares real and reactive power control for a DFIG (doubly-fed induction generator) based wind turbine system using stator-voltage and stator-flux oriented frames. The paper presents DFIG steady-state and transient models in d-q reference frame. The steady-state model is used to obtain the general relationship between the rotor d/q current and stator real/reactive power references using...
Multi-phase machines and sensorless controllers have the common goal to increase the reliability and robustness of the drive. Nevertheless, few sensorless drives have been developed for the purpose of multi-phase machines. This paper discusses the application of a recently developed sensorless current controller to a multi-phase permanent-magnet synchronous machine rotating at low speed. In this method,...
This paper presents the performance and steady state analysis of mixed pole machine with a new mode of operation where n-phase electric power can be transferred to a load mounted on the rotor, such as rotational antennas and turret systems. The machine construction and theory of operation for this new mode is illustrated. System performance at steady state operation is investigated using both simulation...
This paper presents the performance, steady state and stability analysis of mixed pole machine with a new mode of operation where n-phase electric power can be transferred to a load mounted on the rotor. This type of machine can be used in applications that require control of both rotor torque and rotor electric power, such as rotational antennas and turret systems. The performance includes machine...
The doubly-fed induction generator (DFIG) is a 'special' variable speed induction machine widely used in modern large wind turbines. It is a standard, wound rotor induction machine with its stator windings directly connected to the grid and its rotor windings connected to the grid through a back-to- back PWM converter. The DFIG power generation consists of power delivered from two paths, one from...
This paper presents a new solution, which can completely remove the DC offset and make the dynamic error of flux observation smaller when using the modified voltage model compensated by rotor flux oriented current model. The modified voltage model with error compensation not only completely eliminates the integration drift, but also realizes errorless flux estimation in steady state and dynamic state...
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