Doubly fed induction generators based wind turbines are today one of the most widely used generation systems in wind farms due to the ability of variable speed operation and with decoupled control of active and reactive power. Nowadays these wind turbines are operating without generation limits, but the increasing wind power penetration in power systems must lead to that the wind farms have to operate with production limits imposed by the electrical system operators to maintain the stability of the electrical network. In this paper, a new control system of doubly fed induction generators based wind turbines is proposed for the control of active and reactive powers according to the imposed power limitations. This control system presents an active power controller, reactive power controller and pitch angle controller, in order to operate the wind turbine with optimum power efficiency or with limited active power and the demanded reactive power. This generation control provides a better grid integration of doubly fed induction generators
"Its stator is directly connected to electrical grid, and its rotor's winding is connected to the main grid by (ac-dc-ac) power converters. This wind turbine presents several advantages such as variable speed generation, the decoupled control of active and reactive power and the use of power converters with a rated power of about 25% of the total system power . Nowadays, wind farms with DFIG are operating with maximizing the power extracted from the wind by the maximum power point tracking system (MPPT) and Speed controller by the pitch angle control for power limitation. "
[Show abstract][Hide abstract] ABSTRACT: Nowadays, doubly fed induction generator (DFIG) is one of the most widely deployed in wind farms due the ability of variable speed operation. In this paper, a new control strategy of DFIG based for the control of active and reactive power and pitch angle controller for limited the reference power generated by a maximum power point tracking (MPPT) system and power limitation, in order to operate the DFIG wind turbine with optimum power or with limited active and reactive power. With this control method, the system can participate actively in operation of electrical network, due to the ability of production control, both active and reactive power, according to the imposed power limitations.
2nd International Conference on Complex systems CISC’2011, 6-8 December 2011, Jijel, Algeria, Jijel, Algeria; 12/2011
[Show abstract][Hide abstract] ABSTRACT: This paper presents a survey on power control of wind energy conversion systems, which takes advantage of maximum kinetic energy from the wind and so gets an optimum output power. This article presents some generalities and reviews several researchs in relation to the mathematical model of wind turbine system, the different control strategies used at present with the aim of to achieve an optimum regulation of electric power delivered to grid, and also reviews the hybrid wind power systems.
[Show abstract][Hide abstract] ABSTRACT: This paper presents a scheme for supervisory control of wind farms. We concentrate on reduction of power output variation, but the proposed scheme can also be used for system-wide controls that are related to power variation, such as frequency control or damping of power swings. The scheme may utilize either a separate (external) energy storage device or a power reserve achieved through part-loading of one or more turbines in a wind farm. The proposed supervisory control scheme has been validated on a model of a wind farm with four turbines. Simulations have confirmed the usefulness of the scheme. The proposed control system is general and could also be used for other types of intermittent generators such as wave or solar.
IEEE Transactions on Power Systems 09/2007; 22(3-22):985 - 994. DOI:10.1109/TPWRS.2007.901101 · 2.81 Impact Factor
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