The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In the case of doubly fed induction generator (DFIG), power electronics converter effectively decouples the inertia of the wind turbine generator from the power system. Hence, the increased penetration of DFIG results in higher frequency excursion and increased rate of change of frequency in the event of generation loss or increased load demand. This paper presents the added feature of frequency regulation...
In existing load flow model of induction generators, the magnetizing path is moved to the stator terminal, parallel to the shunt capacitor, yielding the same stator and rotor currents. The power output is equal to the mechanical power input. The stator resistance and the machine loss are ignored. It can not provide the initial condition for the dynamic and control schemes requiring the exact stator...
Aiming for the application in petroleum-heating field, an induction wind power generation system with graded capacitors and load is designed. The system is simple, reliable and low cost. Under variable generator speeds, the output voltage variation is controllable by switching the graded capacitors, and the output power is adjusted to guarantee the effective utilization of the wind power. The optimization...
This paper presents two RX models of a wind-driven wound-rotor induction generator (WRIG) with dynamic slip control for load-flow calculations of a large-scale wind farm connected to a distribution system. The wind farm contains multiple wind-driven WRIGs with dynamic slip control operated under different wind speeds. The steady-state quantities of the studied wind-driven WRIG with dynamic slip control...
This paper presents a new transient model of a standalone (isolated) Three phase self excited induction generator (SEIG). This model is based on direct phase quantities and is suitable to study the performance of the generator under any balanced or unbalanced conditions. It includes a general load as well as general excitation capacitor model. The model has the advantage of connecting or disconnecting...
This paper presents a modal analysis of a two machine power system that includes a doubly-fed induction generator (DFIG). The DFIG's model considers rotor flux linkages as dynamic states and stator flux linkages as algebraic variables. Active- and reactive-power controllers are also modeled. Active power is tracked for optimal power extraction from the wind. Using the power system set of differential-algebraic...
For doubly fed induction machines operating as wind generators (DFIG), the terminal voltage and the active power delivered to the grid are controlled by a PWM converter linked to the machine rotor. The monitoring of the direct and quadrature axis components of the rotor voltage makes possible the control of the terminal voltage and active power, respectively. Currently, this control is performed by...
This paper deals with the modelling and effect of Doubly Fed Induction Generator (DFIG) for wind turbines on transient stability analysis when connected to grid system. A reduced order model for the DFIG has been used. A controller for speed, voltage and power factor has also been implemented. The DFIG model and the controller are presented as Differential Algebraic Equations (DAE). A 7th order model...
The performance of double-fed induction generator (DFIG) is greatly affected by the parameter of magnetic inductance in both normal and abnormal condition of grid. In this paper, an additional control loop is added to achieve ideal cutting-in results with an imprecise parameter of magnetic induction. For verifying the proposed method the simulation results are presented in the paper.
Wind energy is considered the most viable proposition among the renewable energy options. Of various Wind Energy Conversion Systems (WECS), fixed speed induction generator based WECS directly connected to the grid is the cheapest and simplest option and has the largest market share. This type of WECS does not require any power electronic interface to allow the grid connection unlike the variable speed...
It is expected that increasing amounts of new generation technologies will be connected to electrical power systems in the near future. Most of these technologies are of considerably smaller scale than conventional synchronous generators and are therefore connected to distribution grids, as the DFIG-based wind farm. When connected in small amounts, the impact of wind farm on power system transient...
This paper widens the knowledge about the microgeneration transient response under faulted conditions. The paper provides the following significant contributions: Firstly, a range of microgeneration transient models have been developed in PSCAD/EMTDC and tested on a typical distribution network. Two types of technologies are considered: a small diesel engine driving a three-phase synchronous machine...
As generation and transmission costs, system stability, and security issues continue to be complicated by growing electricity demand that relies primarily on centralized electricity production, alternative distributed generation (DG) systems show promise as a solution. This paper presents a hybrid wind-microturbine generation (MTG) system for stand-alone applications. The Wind-MTG hybrid mainly consists...
Renewable energy sources have the ability to provide electric power in rural areas whenever available. Although it is cheap, clean and abundant, the variation of output power with the variation of wind speed can cause significant power quality issues, especially in the case of a standalone generation system. This paper studies a network presenting a rural load, such as a small village, fed from a...
Wind power generation is regarded as the most promising of all renewable energy supply to meet the global commitment to climate change. Of all wind power technologies, the fixed speed system employing the rugged squirrel cage induction generators (SCIGs) are the cheapest and simplest for grid connection. While the self excitable induction generator behavior in stand alone circumstances has been studied...
This work considers the seldomly treated case of rotor turn-to-turn fault of a doubly-fed induction generator. This fault can take place where the doubly-fed induction generator is a standard solution in wind power stations. For investigations an error-adoptable three phase machine model is derived and simulated. Furthermore the model is integrated in a wind energy plant model and simulated for a...
Electricity from wind provides an alternative to conventional generation that could be used to achieve significant reductions in fossil fuel use and consequently industrial emissions. Recent progress in wind power generation has led to the use of grid connected and self excited induction generators (SEIG). Induction machines are commonly used in these applications. Aluminum has been the common conductor...
This paper presents the implementation and design of a power converter for an autonomous wind self-excited induction generator (SEIG) feeding an isolated load through the employment of a DSP-based rectifier-inverter circuit. The output voltage and frequency of the studied wind SEIG is inherently variable due to random fluctuation of wind-speed variation. A three-phase constant-voltage constant-frequency...
Doubly fed induction generator DFIG operating in standalone mode is described. Analysis of single phase model allow for the selection of the filtering capacitance connected to the stator. The standalone DFIG is compared to the classical synchronous generator with DC excitation current. Method of output voltage control using PI controllers of the rotor current is shown. Decoupling between the amplitude...
Wind energy is one of the most economic and environment friendly energy source. Recently, the study of induction machines as an application in wind power systems has attracted considerable attention. Self excited induction generators (SEIGs) have found wide spread use in energy systems such as wind and small hydro. Unlike grid connected induction generators, the frequency of SEIG varies with the rotor...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.