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The present paper deals with the problem of designing a novel nonlinear control scheme for a self-exited induction generator driven by variable-speed wind turbine in stand-alone system. A comparison with classical PI control schemes previously developed will also be developed. The proposed nonlinear control is based on the Lyapunov approach, which is suitable for the nonlinear behavior of the induction...
This paper presents the experimental design of a stand-alone field-oriented control (FOC) for wind turbine based on a doubly fed induction generator (DFIG). The control law is synthesized using a hybrid FOC-Hysteresis current controller (HCC) in Rotor side converter (RSC) and the stator is connected to the resistive load via rectifier (nonlinear load). The regulation is achieved below the synchronous...
This paper presents a neotype control strategy for maximum power point tracking (MPPT) of doubly-fed induction generator based wind turbine (DFIG-WT). The strategy adopts proportional-integral (PI) based regulators and feedback linearization control (FLC) based regulators in the power and current control loops of DFIG, respectively. The FLC based regulator can fully decouple and linearize the nonlinear...
In this paper, a control strategy optimized by Mine Blast Algorithm (MBA) is applied on a variable speed wind generator (VSWG) system based on a doubly fed induction machine. The proposed MBA is applied to evaluate the optimal parameters of the current PI controller such that obtaining rotor current closes to the desired one; this purpose is achieved by minimizing the sum of squared error (SSE) between...
This paper proposes a control scheme for the wide operation range of an induction generator (IG) with a Vienna rectifier. A Vienna rectifier has the limited operation range because the sign of the current should be the same as that of the voltage in the normal operation. For this reason, the power factor of a Vienna rectifier is also limited. In the IG, the d-axis stator current is necessary for the...
This paper proposes a viable solution to the long-lasting issue of using flux-involved control scheme to regulate the behavior of doubly fed induction generator (DFIG) during faults. Instead of trying to design a complicated method to measure flux, which cannot be directly measured with contemporary technology, the solution utilizes unscented Kalman filter-based dynamic state estimation of DFIG connected...
This paper deals with the modeling and control of a hybrid system meant for the integration of a doubly-fed induction generator (dfig) and a wind turbine. This paper involves the THD analysis also of a doubly-fed induction generator (DFIG) driven by the wind energy conversion systems. Harmonics are smaller in amplitude but the number of cycle is more as compared to the fundamental. The purpose of...
The paper describes the development of an algorithm for maximum power extraction with a strategy for optimal efficiency of wind energy conversion system (WECS). The proposed control strategy attempts a dual purpose of maximum power extraction from the wind turbine and an optimal efficiency of the induction generator. This combination of the controller strategy results in increasing the overall efficiency...
This paper presents a novel method for state estimation in doubly fed induction generators (DFIGs) using an Extended Kalman Filter. In this work, the conventional nonlinear state space model of a DFIG has been augmented with additional states in order to make rotor position and speed estimates more robust to disturbances. The effectiveness of this method has been tested for various transient cases...
In recent years, it has been proven that one of the main issues in isolated applications is the importance of the dynamic characteristics assessment of three phase self-excited induction generator (SEIG). This paper presents a generalized state-space dynamic model using D-Q stationary reference frame of such a three phase SEIG. The values of self-excitation capacitance and the minimum and maximum...
This paper investigates the operation of wind driven DFIG under unbalance Voltage or unsymmetrical fault condition. According to grid codes worldwide the wind driven DFIG are required to supply reactive power during and after the fault. It has been observed that the conventional vector control method used for control of DFIG does not work well during fault conditions. To reduce the oscillations in...
This paper investigates the effect of Series Dynamic Breaking Resistor (SDBR) sizing on a Doubly Fed Induction Generator (DFIG) based wind power conversion system. The boundary of the SDBR value is firstly derived by taking into account the controllability of the rotor side converter and the maximum allowable voltage of the stator. Then the impact of the SDBR value on the rotor current, stator voltage,...
The paper is concerned with the wind energy conversion system (WECS) applying doubly fed induction generator. It addresses the question whether the slip-torque characteristic of the generator belonging to short circuited rotor can be shifted along the slip axis only by the rotor voltage in the slip range ±0.3 resulting in more-less similar set of slip-torque characteristics as can be achieved with...
The doubly fed induction generators (DFIGs) are used in almost 50% of the offshore and onshore wind power plants. The DFIGs offer advantages compared to fix speed induction generators. The DFIGs are sensitive to grid voltage disturbances and require additional protection for the rotor side power electronic converter, like crowbar protection. In the present paper two active crowbar topologies are compared,...
This paper proposes a direct power control scheme of a doubly-fed induction generator under wind speed variations. The PI controllers are used to control active and reactive power. A control scheme is developed that uses stator flux orientated vector control. Power transfers are carried out in hyper synchronous and hypo synchronous mode, depending on the generator speed. Back to back converters with...
Condition monitoring of Doubly Fed Induction Generators (DFIG) is growing in importance for wind turbines. This paper investigates the effect of VFC (Variable Frequency Converter) and STATCOM Faults on wind turbine equipped with DFIG operation in order to condition monitoring of wind turbine. Consequently, a proposed method is used to detecting these faults means of harmonic components analyzing of...
In order to meet increasing power demand, taking into account economical and environmental factors, wind energy conversion is gradually gaining interest as a suitable source of renewable energy. The modeling of Wind Energy Conversion System(WECS) is done in MATLAB-SIMULINK. The dynamic d-q model of the induction generator is developed from the fundamentals in a modular approach in simulink. A fuzzy...
This paper presents modeling, simulation and transient analysis of three phase self-excited induction generator (SEIG) driven by a wind turbine. Three phase self-excited induction generator is driven by a variable-speed prime mover such as a wind turbine for the clean alternative renewable energy in rural areas. Transients of machine self-excitation under three phase balanced load conditions are simulated...
This paper proposed an experimental approach to DVTC and DPC control algorithms for Wind-Turbine System - DFIG using the DSpace software 1103 in conjunction with Matlab/Simulink. The algorithms for controlling rotor-side converter (RSC) of a doubly-fed induction generator (DFIG) system include direct power control (DPC) strategy for controlling power flow and direct virtual torque control (DVTC) strategy...
This paper presents the performance of a stand-alone self-excited induction generator (SEIG) under balanced/unbalanced loads and excitation when SEIG is driven with wind energy system. An approach based on three-phase induction machine model is employed to derive dynamic equations of an isolated SEIG under balanced/unbalanced conditions of loads and excitation. The SEIG model with balanced/un-balanced...
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