Design of Nonlinear Synergetic Controller for Transient Stabilization Enhancement of DFIG in Multimachine Wind Power Systems
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In this paper, an adaptive nonlinear controller for transient stabilization and voltage regulation of wind power systems based Double Fed Induction Generator (DFIG) in multimachine environment is described using a classical third order dynamical model of the DFIG. Estimation of non measurable time derivative signals (quadrature stator current component of the DFIG, mechanical input power, unknown transient open circuit time constant for direct axis) and an online computing technique for the operating points (e.g. power angle and its reference) are presented. The major advantage of the proposed control law is its robustness with respect to large disturbances, parameter variations and change of the operating point. Simulation results in the case of 4-machine power systems show the performance of the proposed control scheme and its heftiness properties.Keywords:
Robustness
Transient (computer programming)
Different electric wind power conversion systems structures can be used based on the converters topologies.A Wind Energy Conversion System (WECS) differs from a conventional power system.The power output of a conventional power plant can be controlled whereas the power output of a WECS depends on the wind.This nature of WECS makes it difficult for analysis, design and management.Various approaches have been developed to study the behavior of WECS.In this paper, the steady state characteristics of a WECS using doubly fed induction generator (DFIG) is analysed using MATLAB.The dynamic steady-state simulation model of the DFIG is developed using MATLAB.Simulation analysis is performed to investigate a variety of DFIG characteristics, including torquespeed, real and reactive-power over speed characteristics.Based on the analysis, the DFIG operating characteristics are studied.
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The doubly-fed induction generator (DFIG) plays an increasingly important role in the fast growing wind energy industry. This paper presents results from fundamental research which gives some analytical insights into the success and the limits of the DFIG in wind farm applications.
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Wind power penetration is rapidly increasing in today's energy generation industry. In particular, the doubly-fed induction generator (DFIG) has become a very popular option in wind farms, due to its
Wind generator
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The performance of fixed speed wind turbines is less satisfactory than the modern variable speed wind turbines like Doubly Fed Induction Generator (DFIG). Nowadays DFIGs are playing a significant role in wind turbine industry/wind power generation system due to some of it's special features. To improve the stability of existing fixed speed induction generator (IG) based wind farm different types of controlling strategies are used. In this paper it is seen that DFIG can be used to generate power as well as to increase the stability of an IG based wind farm without any controlling device. This study recommends/suggests to use DFIG for increasing the total capacity of grid connected IG based wind farm. Thus the performance IG can be improved. The simulation analyses have performed using PSCAD/EMTDC software.
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With the increasing installed capacity of wind farms, the stability and the security operation of regional grids, which wind farms connect to, are giving a growing concern. Due to the stochastic variability of the wind energy output, the high level of wind energy penetration will lead to grid voltage fluctuations, and the voltage and reactive power problems caused by gridconnected wind farms has become one of the most prominent problems for network operations.
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To augment wind energy rates,we investigated the contribution of doubly fed induction generator(DFIG)to system inertial response and frequency regulation,and analyzed the influence of auxiliary loop parameters on the inertial response.Accordingly,we also introduced a novel algorithm to enhance the participation of doubly-fed induction generator(DFIG)in existing frequency regulation mechanisms.The proposed approach adopts the fast response capability associated with DFIG,and allows the kinetic energy stored by rotational masses to be partly and transiently released so as to provide earlier frequency support.Simulation results show that the proposed strategy can greatly improve system frequency regulation.
Frequency Regulation
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The paper presents decoupled generating system equipped with induction generator and reactive power compensator. The feature of induction generator is reactive power demand that depends on instantaneous active power. Since active power of wind turbine varies, therefore follow-up control of reactive power compensator is desirable. Such a compensator control allows power factor to be kept high and constant. The paper shows proposed control structure. The generating system computer model is presented. Moreover laboratory results carried out using 7.5 kW induction generator has been successfully performed and are presented.
Volt-ampere reactive
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Doubly fed induction generator (DFIG) wind power generation system is widely used in wind farm all over the world. Reactive power can be generated both in grid-side converter and generator-side converter of DFIG. In this paper, working principle and control method of DFIG are introduced, and the reactive power limit of DFIG is derived, finally reactive power regulation is simulated in Simulink.
Power grid
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