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Nowadays, the continuously increasing of the energy consumption all over the world presents the cause of renewable energy sources development. In this context, wind energy conversion systems (WECS) based on double fed induction generator (DFIG) are widely used in both grid connected and stand-alone modes. In both cases, management and control technologies are widely developed in the literature. In...
With the more substantial large-scale wind integration projects implemented in the province of Alberta, wind power has been growing steadily in the province to meet the increasing consumer demands. Meanwhile the transmission and distribution networks are being updated to satisfy the transmission capacity. Under the transmission line and substation construction with planned transmission line outages,...
This paper presents an innovative DFIG which has autonomous frequency control for stand-alone operation. When the wind farm is islanded, such DFIGs synchronize to form a reliable wind farm frequency source which does not collapse when member DFIGs fail. The frequency enables frequency droop control to be implemented for load sharing. The wind farm can provide fast reserve, ready to support a weakened...
In close future, with high Wind Power (WP) penetration in the power system, the burden of Load-Frequency Control (LFC) is gradually shifted to Variable Speed Wind Turbines (VSWTs). In order to equip the VSWT with LFC capability to support the grid during sudden load-generation imbalance, sufficient reserve capacity should be procured. This paper addresses the LFC scheme offered by VSWT. Feedback loop...
This paper deals with a new Autonomous Wind Energy Conversion System (AWECS) employing parallel operated Permanent Magnet Synchronous Generators (PMSGs) driven by variable speed wind turbines and feeding three-phase four-wire local loads. The proposed system utilizes three Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors (IGBTs) based voltage source converters (VSCs) with a battery energy...
Operation characteristics of doubly fed wind turbine generator system under grid voltage unbalance conditions are analyzed. In order to restrain various pulsations, a coordinated control strategy of rotor-side and grid-side converters of a doubly fed induction generator (DFIG) is presented. Taking the pulsations of electromagnetic torque, stator reactive power and system total output power at double...
With a view to the integration in national power system of new power plants based on renewable energy sources, such as wind energy, this paper presents the technical requirements related to the connection of the wind power plants to the main grid. Grid connected wind turbines may cause power quality problems, such as voltage variation and flicker, and therefore, the connection of wind farms requires...
This paper investigates dynamic behavior of a distribution subsystem (microgrid) with three distributed generation (DG) units to planned and accidental switching event. Three DG units are one gas-turbine synchronous generator and a variable-speed wind turbine with doubly fed induction generator (DFIG) and a converter based DG. A power control approach is proposed for DG units to provide both voltage...
This paper presents the development of wind farm models for design and verification of centralized voltage and frequency control strategies. First, a detailed model of wind turbine with permanent magnetic generator is established in Pscad / EMTDC simulation tool, and then it is extent to a simplified wind farm. Second, an overall wind farm level control strategy is designed and tested. At last, real...
Nowadays, many economic and environmental benefits derived from distributed generation (DG) enable DG to play an increasingly important role in distribution networks satisfying the expanding power demand. Doubly-fed induction generator (DFIG) based wind turbine has been widely used for DG due to its many advantages such as high efficiency, fine controllability and improved power quantity. In the situation...
This paper presents voltage and frequency stabilisation methods of a hybrid wind-diesel power system. A technique for power sharing between a wind energy conversion system and a diesel generator system is also addressed during the wind-diesel hybrid operation. The output voltage and frequency of the wind energy conversion system is controlled by a load side converter. The voltage and frequency of...
By analyzing the operation behavior of an A.C. excited variable-speed constant-frequency (VSCF) wind-power generator, the field-oriented vector control technique and and the internal model controller (IMC) are transplanted into the voltage control of DFIG.The IMC were transplanted into the cutting-in control of the doubly-fed induction generator with no-load and a novel cutting-in control strategy...
As the number and size of wind farms continue to grow, many countries have established or are developing a set of specific requirements (i.e., grid codes) for operation and grid connection of wind farms. The objective of these grid codes is to ensure that wind farms do not adversely affect the power system operation with respect to security of supply, reliability and power quality. This paper reviews...
The paper will put a forward a description of a realistic design for a brushless doubly-fed machine that is of practical value. It takes the form a 4-pole / 8-pole machine aimed for use in a 2 MW wind turbine over a correct speed and torque range. Previous examples discussed laboratory machines and this study takes the outcomes from these studies to formulate a procedure for sizing and designing the...
Doubly fed induction generators (DFIGs) are widely used in wind generation. The possibility of getting a constant frequency AC output from a DFIG while driven by a variable speed prime mover improves the efficacy of energy harvest from wind. In the power lab at North Dakota State University (NDSU), the wind turbine is substituted by a variable-speed DC motor which dives a DFIG. A wound rotor induction...
The paper is aimed at presenting the dynamic behaviour of a wind turbine equipped with a doubly fed induction generator (DFIG) in case of disturbances in the interconnected grid. A model of a DFIG is presented and adapted for analyzing the response of the wind generator to voltage control, frequency control, voltage sags and wind variations. Simulations, performed by a widely used power system analysis...
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