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A robust adaptive nonlinear controller is designed for a Doubly-Fed Induction Generator (DFIG) wind turbine connected to a power grid. The controller main objective is to regulate the generator terminal voltage and rotor speed. A model based control design strategy is adopted. The controller structure and equations are obtained following a backstepping control design method using the DFIG reduced...
Accurate and fast detection for phase angle of the generated voltage is important in parallel grid- connected wind energy conversion systems (WECSs) utilizing converter-inverter unites. Software Phase Locked Loop (SPLL) technique is presented here for precisely detecting the phase angle during presence of the 5th and 7th harmonics. A second-order loop filter design is proposed here as a good trade-off...
This paper presents analysis, design, and simulation for vector oriented control of three-phase voltage source pulse-width modulation (PWM) inverter which aims to optimize the utilization of wind power injected into the grid. To realize this goal, a digitally controlled converter-inverter system is proposed which provides economic utilization of the wind generator by insuring unity power factor operation...
In comparison with other types of synchronous generators, permanent magnet synchronous generator (PMSG) has the advantages of higher efficiency, simplicity in construction and reliability in operation. This paper presents a multi-stage 3-phase AC/DC PWM converter. The proposed converter is designed to extract the maximum power from the PMSG side and avoid speed sensing. Furthermore, the controller...
This paper presents a performance analysis of wind-powered self-excited induction generator (SEIG) and a vector-controlled pulse-width modulation (PWM) converter. Three-phase voltage-source converters are the building blocks of a great number of power electronic systems. The origin of difficulties in the control of the above converters is in their nonlinear nature. The PWM current control technique...
Power-supply/temperature-variation-aware circuit components, such as a current source and a comparator, based on adaptive reference-voltage control are proposed for robust multiple-valued current-mode (MVCM) circuits.Since the reference-voltage level generated by the proposed reference-voltage generator is changed in proportion to the power supply, the gate-source voltage VGS of PMOS transistor at...
Distributed reactive power supply is necessary in distribution networks for an optimized network operation. This paper begins with a presentation of the reactive power supply capabilities of generators connected to the distribution network (distributed generators). The second step proposes an approach of determining energy losses resulting from reactive power supply by distributed generators. The...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
In the doubly-fed wind generator system, a bi-directional converter is needed to control the energy bi-directional flow due to the different operation of generator. Doubly-fed PWM converter with attractive characteristics, such as well sinusoidal waveform of input current, high power factor, low THD (total harmonic distortion) to the grid and motor, and bi-directional conversion, could better meet...
In recent years, digitization of all control parts in switching power supplies including PWM generators is progressing for demands such as intelligent performances and common use of hardware, etc. Then, a problem is in the resolution of digital PWM generators for improving control performances. Since the digital PWM generator is constituted using a counter, a carrier wave turns into a stairs wave,...
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