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This paper is interested in the study of a wind energy conversion system (WECS) based on a doubly fed induction generator (DFIG) connected to the electric power network. The aim of this work is to compare the energy production unit performances by the use of two types of controllers. Classical PI and polynomial RST controllers are applied for the WECS control in terms of instruction tracking and robustness...
Power system with high penetration of wind power requires a developed control strategy to obtain optimal dynamic performance under load variations. An algorithm utilizing internal model control (IMC) design method for the control of doubly fed induction generator (DFIG) operating at variable speed constant frequency is proposed. The proposed structure is a stand-alone generating system and feeds a...
Due to the asynchronous generator has many negative factors such as large power fluctuation, poor transient performance, low energy efficiency, etc. The doubly fed induction generator(DFIG) is becoming a popular concept and thus the modeling of DFIG becomes an interesting research topic. This paper develops the DFIG model of power flow and third-order transient in which the power converter is simulated...
This paper presents a performance analysis of wind-powered self-excited induction generator (SEIG) and a vector-controlled PWM converter. Three-phase voltage-source converters are the building blocks of a large 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 is used to derive the switching...
In this paper, according to the characteristic of AC-excited variable speed constant frequency wind turbine generation, stator voltage orientation vector control strategy is adopted in double-fed induction generator (DFIG). Firstly, the paper studies the running characters of DFIG, and the principle of DFIG under no-load cutting-in condition. Then according to the mathematical model of DFIG under...
This paper purposes an adaptive parameter estimation algorithm which is basis on the decoupled vector control modeling of DFIG. Through designing state observer and selecting a proper Lyapunov function, the parameters of DFIG can be estimated, the simulation and experiment shows the feasibility of this method.
Demand for wind power has increased considerably due to technological advances and favorable government policies. As a result, large wind farms with multi-megawatt capacity are connected to sub-transmission and transmission systems. With high penetrations of wind energy, performance of the overall system is affected by the technical impacts introduced by wind turbine generators (WTG). Fault current...
The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. In particular the control scheme of the grid side converter is adapted to assist in the control of the total power oscillations when the rotor side converter is controlling the DFIG torque pulsations. A DFIG model is implemented in Matlab/Simulink...
Any wind energy conversion system (WECS) experiences uncertainty in wind velocity, tip-speed ratio, power co-efficient and stiffness of the wind turbine shaft. Also, the magnetizing inductance of the induction generator varies during self-excitation process. This makes the analysis and control of WECS, a difficult proposition. This paper presents an interval analysis based computation method for the...
The wind power generation technology has evolved significantly in the past few years with the demand for distributed, renewable energy growing. The doubly-fed induction generator (DFIG) is one of the most attractive solutions among many energy conversion devices for wind energy. The doubly-fed induction generator with a back-to-back four-quadrant ac-dc-ac power converter between the rotor side and...
With the penetration of wind energy is becoming higher and higher in power systems, itpsilas necessary to investigate the impact of wind generations on small signal stability. This paper discusses small signal stability of large scale variable speed wind turbines with doubly fed induction generator integration, as they has the ability to vary their operating speed in order to gain optimum power extraction...
This paper presents a fundamental development and analysis of the induction machine connected via a transmission line to an infinite bus system. A third order dynamic model is used to represent the induction generator and the obtained resultant nonlinear system equations are analyzed to calculate a condition that guarantees the existence of equilibrium points to the dynamic system. This condition...
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