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This paper deals with the application of enhanced phase locked loop (EPLL) technique for the voltage and frequency controller (VFC) in a stand-alone wind energy conversion system (WECS) using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The fundamental component of three-phase load currents is extracted using EPLL. The EPLL is also used for estimation of the frequency...
This work deals with the operation and control of a wind turbine driven isolated asynchronous generator (IAG) system to feed three-phase four-wire consumer loads. The voltage and frequency controller (VFC) of IAG consists of a three-leg voltage sourced converter (VSC) and a battery energy storage system. A zig-zag transformer is used to provide the neutral terminal for three-phase four wire consumer...
In this study, control of standalone doubly-fed induction generator (DFIG), mainly used at wind turbine, has been realized by using direct voltage control scheme. In the study standalone DFIG driven by an induction-machine (IM) has been used. The IM has been rotated at sub-synchronous and super-synchronous speeds by using an inverter. Rotor circuit's power has been controlled by a rotor side converter...
This paper analyzes distinct digital sensorless control systems used to regulate and to suppress harmonics on the output voltages of a self-excited squirrel-cage induction generator in isolated systems under nonlinear loads. A normalized discrete model of the inverter operated as static VAr compensator and active power filter are presented considering its implementation in a DSP TMS320F2812. Furthermore,...
Present paper describes the design of a doubly fed induction generator (DFIG) test bench with active crowbar, using a PWM voltage-fed inverters connected between the grid and the rotor. A vector control scheme is proposed in order to control the power-side and the rotor- side of the converter. A control board, based on a digital signal processor (DSP) and a FPGA, has been developed to manage the overall...
This paper presents the implementation and design of a power converter for an autonomous wind self-excited induction generator (SEIG) feeding an isolated load through the employment of a DSP-based rectifier-inverter circuit. The output voltage and frequency of the studied wind SEIG is inherently variable due to random fluctuation of wind-speed variation. A three-phase constant-voltage constant-frequency...
This paper presents design and implementation of Digital Signal Processor (DSP) based induction generator controller (IGC) to regulate the voltage and frequency of single phase self excited induction generator (SEIG) which employs a three phase squirrel cage induction machine, suitable for stand alone power mode employing unregulated turbine such as micro-hydro power generation. A three phase induction...
A grid connected power generation systems based on the superior controllers of an active and reactive power are useless during a grid failures like grid short-circuit or line braking. Therefore the change of operation mode from grid connection to stand alone allows for uninterruptible supply of a selected part of grid connected load. However, in the stand alone operation mode the superior controllers...
This paper presents a strategy used to appropriately excite and control the desired output active power of an asynchronous generator fed by a current controlled three-phase voltage source inverter. A DC voltage control loop, with a classical PI controller, is used to maintain at a reference value the DC bus voltage of the source inverter under a large rotor speed variation. The proposed asynchronous...
In this paper, a test-bed built for the experiments of variable-speed constant-frequency (VSCF) wind power generation is described. The test-bed is composed of a doubly fed induction generator (DFIG), a VVVF inverter driven squirrel motor for wind turbine simulation, dual-DSP-based controllers, as well as a PC-based data-acquisition and control system. In this system, a pair of bidirectional PWM voltage-source...
A grid connected power generation systems based on the superior controllers of an active and reactive power are useless during a grid failures like grid short-circuit or line braking. Therefore the change of operation mode from grid connection to stand alone allows for uninterruptible supply of a selected part of grid connected load. However, in the stand alone operation mode the superior controllers...
This paper presents a strategy used to appropriately excite and control the desired output active power of an asynchronous generator fed by a current controlled three-phase voltage source inverter. A DC voltage control loop, with a classical PI controller, is used to maintain at a reference value the DC bus voltage of the source inverter under a large rotor speed variation. The proposed asynchronous...
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