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Because of increasing generation of electricity from non-conventional sources all over the world including India, there is heavy demand for Doubly Fed Induction Generator (DFIG) as it possess several merits over other conventional generators. This papers presents a literature review for control of DFIG based wind energy conversion systems under unbalanced grid voltage conditions. Various techniques...
There is now general acceptance that the burning of fossil fuels is having a significant influence on the global climate. In this scenario renewable energies will have to contribute in energy diversity and security of supply. That the world's ever knows a similar rising need of energy. Wind energy is a promising technology and becomes more and more interesting player on the market of energy production...
This paper proposes a control scheme for a wind turbine using a DFIG electromechanical converter, implemented through an NPC three-level back to back converter, that keeps a unitary power factor injection to the grid and maximizes the energy harvested from wind, using a maximum power point tracking algorithm (MPPT). A predictive direct power control (DPC) strategy drives the grid-side converter, to...
The paper presents properties and control methods of grid-connected doubly-fed induction generator (DFIG). The paper is focused on unbalanced grid operation, because presently it is the biggest challenge for this type of generator. There are discussed three most popular methods - direct power control, direct torque control, and vector control with proportional-resonant PR controllers of rotor current...
In this paper a proposed control strategy based on fuzzy logic for three-phase PWM rectifiers is discussed. This technique is called direct control of fuzzy power (DPCF). The objective of this paper is to substitute both hysteresis controllers of the active and reactive power by a single fuzzy controller which adjusts both active and reactive power at the same time. The aim of this work is to eliminate...
In this paper, a model-based Direct Power Controller (DPC) is proposed for Hybrid HVDC. This Hybrid comprises a Voltage Source converter (VSC) using in the sending side and Line-commutated Converter (LCC) using in the receiving side. This application is potentially attractive for power flow in one direction, for example the integration of offshore wind farms. DPC controller is able to control directly...
The use of the Doubly-fed Induction Generator (DFIG) in large wind turbines is growing rapidly, the wind farms are today required to participate actively in grid operation by an appropriate generation control. The study focuses on the direct power control (DPC) of the DFIG active and reactive powers (DPC) using the so-called sliding mode control (SMC). A model has been developed, including the mechanical,...
This paper presents a synthesis of a switching table by means of sliding mode theory for a direct power control (DPC) of electrical systems. It is applied to the control of a variable speed wind system based on a doubly fed induction generator (DFIG). Control of active and reactive stator power exchanged with the grid is achieved by delivering to rotor side converter (RsC) references voltage rotor...
This paper presents a Field Programmable Gate Array (FPGA) implementation of a Direct Power Control (DPC) of three-phase Pulse Width Modulation (PWM) boost rectifier. The DPC control was synthesized via the sliding mode theory. The main interest of using such theory is the robustness of the resulting control to parameters variations and external disturbances. In the other hand, thanks to the possibility...
The paper briefly describes and compares some new methods of Direct Power Control of a two- and three-level AC/DC converter. The basis for comparing the methods was the equality of switching energy losses in each of the methods.
This paper presents a novel integrated control scheme for three-level neutral point clamped (NPC) based PWM rectifier-inverter. Two measures are taken to minimize the size of dc-bus capacitors which are expensive, bulky and have a lifetime limit. Firstly, the direct power control (DPC) for front-end three-level PWM rectifier is applied, which will provide better dynamic performance for the dc-link...
This paper focuses on a three-level pulse width modulation (PWM) rectifier with direct power control (DPC) strategy based on switching table. The influences of power control coupling on system performances are analyzed and an optimized three-level DPC strategy is developed. The proposed three-level DPC changes the selection of control vectors dynamically according to the location of grid voltage vector...
In this paper, we present a direct power control (DPC) of three-phase pulsewidth modulation rectifier with constant switching frequency using space-vector modulation (SVM). The developed DPC scheme is based on the predictive control strategy to achieve direct control of instantaneous active and reactive power of the converter. For this purpose, at the beginning of each switching period, the required...
A flywheel energy storage system (FESS) is associated to wind turbine (WT) to increase its penetration rate into the grid and to improve its contribution to the ancillary services. In this paper, the authors investigated a FESS associated to PMSM-wind turbine connected to the grid via a three-phase PWM inverter. The FESS is controlled by a FOC (flux oriented control) strategy cascaded with an external...
In this paper, the model-based direct power controller (DPC) is proposed for a multi-terminal high voltage direct current (HVDC) using Voltage source converter (VSC), which is able to control directly the instantaneous power and reactive power. Moreover, this DPC is able to handle the unbalanced network condition, that is unequal AC voltage due to unbalanced power supplies, unbalanced loads and unavoidable...
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