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Model predictive direct power control (MPDPC) has been widely concerned in the control of doubly fed induction generator (DFIG) systems owing to its simple concept and good multivariate control ability. The optimal voltage vector is selected based on the principle of power error minimization. Nevertheless, the conventional MPDPC still presents relatively high power ripples and the switching frequency...
The aim of this paper is to develop a doubly-fed induction generator (DFIG) wind turbine model suitable for the simulation of this generator in the healthy mode and faulty mode. The dynamic model of a DFIG with rotor and stator inter-turn short circuit fault is proposed. A model (abc) is developed, which can represent both the healthy and faulty conditions. The DFIG is directly connected to the grid...
In almost all European countries, the penetration of wind power systems and the wind turbines size continuously increases. Therefore, the grid code requirements are more and more restrictive concerning the necessity that the wind turbine to remain connected to the grid during a fault situation. This paper analyzes the possibilities to have more accurate wind generation transient stability models for...
Sliding Mode Control (SMC) has been successfully implemented in power converters applications since the discontinuous nature of the controller output allows direct switching of power electronic devices. However, due to physical limitations of power converter, the switching frequency must be maintained at low levels in order to prevent overheating and hazardous conditions of the semiconductors, therefore,...
This paper presents a wind-driven DC power generation and control system modified by a doubly fed induction generator (DFIG), which stator is connected with a full-power diode rectifier to supply DC power to a stand-alone load and rotor is connected to the DC link with a PWM converter in charge of regulation of frequency and voltage on stator side. The transient character and behavior of current,...
A second order integral terminal sliding mode control (SOITSMC) is proposed in this paper for a rotor side converter (RSC) of a DFIG-based wind turbine. The design is based on a novel sliding manifold and aims at improving the turbine's performance while minimizing chattering. The controller performance and its robustness were studied under voltage sag conditions and parameter variations. Simulation...
In recent years, environmental problems are becoming serious and renewable energy systems, especially wind power generation, have attracted much attention and been introduced into power systems. However, wind power generator output is intermittent, resulting frequency fluctuations in the connected power system. A doubly fed induction generator (DFIG) based diesel generation system is proposed in this...
Doubly fed induction generator (DFIG) based wind farm connected to series compensated networks will introduce sub-synchronous resonance (SSR). Most of the studies have ignored the effect of DFIGs at different locations. In this paper, a large-scale wind farm is divided into two sub wind farms, represented by two aggregated DFIGs at different locations. Impedance models of two sub wind farms and the...
Much attention has been paid to Virtual Synchronous Control (VSynC) strategy for Doubly-Fed Induction Generator (DFIG) due to its advantage in providing dynamic supports of frequency and voltage. However, current researches of VSynC strategy focus on analysis of its electromechanical behaviors, and neglect its electromagnetic transient responses and fault characteristics, hindering its application...
Rotor speed changes with variation of electrical power witch controlled by converter in doubly-fed induction generator(DFIG), compared to the large thermal power unit DFIG is more suitable for adjusting the power fluctuation of fast varying component. In this paper, a primary regulating strategy of DFIG by distinguishing power fluctuating frequency is presented. DFIG is expected to participate in...
This paper investigates the influencing factors and mechanism of sub-synchronous resonance (SSR) phenomenon in the doubly fed induction generator (DFIG) based wind turbines to a series compensated transmission system. First, a model of DFIG-based wind power unit interconnected with series compensated networks is developed to analyze the mechanism of induction generator effect (IGE) and sub-synchronous...
In recent years, there has been a large increase in power demand without corresponding increase in power generation. With the issues around global warming, the use of renewable energy such as wind and solar has gained popularity. Renewable energy is clean, sustainable (will never run out), environmentally friendly. In addition, it requires a relatively low maintenance and running costs. Many countries...
The demand of energy is drastically increasing now days mainly in developing countries like Ethiopia. In connection, wind energy is one of the promising renewable energies sources with the most commonly used Doubly Fed Induction Generator (DFIG). The DFIG's stator is directly connected to the grid, whereas the rotor is tied via dual back-to-back Pulse Width Modulation (PWM) converters. Its active...
Wind power generation has an essential role in renewable energy development. Doubly-fed induction generators (DFIGs) are widely used in wind energy systems due to their variable speed operation capability. In DFIG-based wind generation systems, the machine's stator is directly connected to the ac grid, while the rotor is controlled with a back-to-back converter. For practical simulation of large-scale...
Within the United States, there is a growing demand for new environmentally friendly power generation. This has led to a surge in wind turbine development, but there are other options. In-stream hydroelectric generation (also known as hydrokinetic) is an idea that has been considered for over 30 years and uses many similar principles to wind, but instead of harnessing energy from the air, it uses...
Wind energy has emerged as one of the topmost proliferated sustainable power sources in recent years. One of the major challenges in harnessing wind energy is to extract maximum power from intermittent generation of wind farms as wind power generation strongly depends on wind speed variation. Among different maximum power point tracking (MPPT) algorithms, Hill Climb Search (HCS) method is often preferred...
In recent years, wind power has been developing rapidly. As the wind power penetration from large scale wind turbines has been increasing rapidly in the transmission system, there is a higher requirement for the frequency stability and power generation efficiency of the wind power generation system, and the power grid puts forward higher continuous operation requirements for the grid connected wind...
In this paper, we propose a vector control of a doubly fed induction generator (DFIG) for variable speed wind power generation. The model is developed based on the dual powered generator for the control of the active and reactive powers. Several studies are carried out to test their operation under different wind conditions. The results have shown good performances of the wind energy converter system...
In this paper, wind generator modeling is presented including the algorithm for maximizing the extracted power. The DFIG stator winding is directly connected to the utility grid and the rotor winding is connected via a back to back converter. The oriented flux control allows the machine to follow the set points of active and reactive power.
This paper deals with the design of a second order sliding mode approach for a DFIG-based wind energy system subject to parameter variations and external disturbances. The design is based on a variable structure control computed from the second derivative of a properly chosen sliding manifold. The controller was augmented by a second order sliding mode observer to further improve its performance....
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