Author: others. Category: Documents. Embed Size px x x x x Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for wind turbine blockset in matlab simulink download profit-making activity or commercial gain. You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

General overview and description of the models. Aalborg University. The report provides first a quick overview over Matlab issues and then explains the structure of the developed toolbox. The attention in the report is mainly drawn to the description of the most important mathematical models, which have been developed in the Toolbox.

Then, some simulation results using the developed models are shown. Finally, some general conclusions regarding this new developed Toolbox as well as some directions for future downlaod are made. Table of contentsTable of turrbine Chapter 4 Description of the models Fluxes as state on Untransformed model Determination of parameters for lossless three-phase transformer Conclusions and Future work Harmonic voltage source and grid angle detection Wind turbine systems are an example of such dynamic systems, containing subsystems with different ranges of the time constants: wind, turbine, generator, power electronics, transformer and grid.

The report provides first a quick overview over Matlab issues and then explains brother pt 2420pc treiber download structure of the new developed toolbox.

A special attention has been on increasing the simulation speed for all the models developed in this new Toolbox. Some aspects roland for sv-15 win7 driver stika download the implementation methods in Simulink for a dynamic model are presented. Some simulation results using the developed models are shown. During the work carried out in developing of this Toolbox a large amount of references including books, papers and other sources have been used.

In the report only the most relevant references are mentioned for each particular topic. However, the reference list presented in report includes almost all references in alphabetical order used during the здесь. It integrates computation, visualization, and programming in an easy-to-use environment where problems and solutions are expressed in a familiar mathematical notation узнать больше здесь. Typical uses diwnload.

Many of these tools are graphical user interfaces. Amtlab includes the MATLAB desktop and Command Window, a command history, an editor and debugger, and browsers for viewing help, the workspace, files, and the search path. This blockseg a vast collection of computational algorithms ranging from elementary functions like sum, sine, cosine, and complex arithmetic, to more sophisticated functions like matrix inverse, matrix eigenvalues, Bessel functions, and fast Fourier transforms.

It allows both “programming in the small” to rapidly create quick and dirty throw-away programs, and “programming in the large” to create complete large and complex application programs. MATLAB has extensive facilities for displaying vectors and matrices as graphs, as well as annotating and printing these graphs. It includes high-level functions for two-dimensional and three-dimensional data visualization, image processing, animation, and presentation graphics.

It also includes low-level functions that allow you to fully customize the appearance of graphics as well as to build complete graphical user wind turbine blockset in matlab simulink download on your MATLAB applications. It supports linear and nonlinear systems, modelled in continuous time, sampled time, or a hybrid of the two.

Systems can also be multirate, i. For modelling, Simulink provides a graphical user interface GUI for building models as block diagrams, using click- and-drag mouse operations.

With this interface, the desired dynamic systems can be easily built. Simulink includes a comprehensive block library of sinks, sources, linear and nonlinear components, and connectors. Using S-Functions it is also possible to customize and create user-defined blocks. Models are hierarchical, so the models can be built using both top-down and bottom-up approaches. The system can be viewed at a high level, then double-click blocks to go down through the levels to see increasing levels of model detail.

This approach tudbine insight into how a model is organized and how ссылка parts interact. After defining a model, it can be simulated, using a choice of integration methods, either from the Simulink menus or by entering commands in the MATLAB Command Window.

The menus are particularly convenient for interactive work, while the command-line approach is very useful for running a batch of simulations e g. Monte Carlo simulations or sweeping a parameter across a range of values. Using scopes and other display blocks, the simulation results can be analyzed while the simulation is running. In addition, the parameters can be changed during the simulation for “what if exploration. An S-function is a computer language description of a Simulink block.

S-functions use a special calling syntax that enables the user to interact with Downlad equation solvers. This interaction is very similar to the interaction that takes place between the solvers and built-in Simulink blocks. The form of an S-function is general and can accommodate continuous, discrete, and hybrid systems.

S- functions allow the user to add new models to the Simulink built-in models. An algorithm or model wind turbine blockset in matlab simulink download be implemented in an S-function and then customize a user interface by using masking. The content of the main libraries from this toolbox is briefly shown. Then, some considerations about the simulation speed for the developed models wind turbine blockset in matlab simulink download done.

No particular Toolbox is necessary to simulate a wind turbine concept. So, the user should have installed on the PC dimulink Matlab and Simulink. However, some models wind turbine blockset in matlab simulink download particular blocks from other Toolboxes from Matlab e g. Power Spectra Density calculation windows download pasjans. In this case cannot be used the standard dqo model. Moreover, this model is used to simulate the soft-starter fed induction machines, which are used in fixed-speed wind turbines.

A short description of the libraries illustrated in Fig. The first library Mechanical Components contains: blocksst model, aerodynamic models of the wind turbine rotor, different types of drive train models as shown in Fig. The wind speed is calculated as an averaging of the fixed-point wind speed wind turbine blockset in matlab simulink download the whole rotor, and it takes the tower shadow and the rotational turbulences into account [71].

Since one of the wind turbine blockset in matlab simulink download components in this model is the normally distributed white noise generator some investigations have been done in order to obtain the same wind time ih in all considered simulation tools. It has been found that the built-in white noise generator from different simulation tools uses different algorithms and therefore different wind time series are obtained. Marsaglia [45]. The aerodynamic models of the wind turbine rotor are based on the torque coefficient Cq or power coefficient C?

As mentioned before, the equation of motion is not included in the machine model. Different types of drive train models are developed e g. Since the last model involves 4 differential equations an alternative implementation using C S-Function is also available.

The Electrical Machinery Library contains models with different level по этой ссылке detailing for electrical machines used currently in wind turbine systems as shown in Fig. The standard dq models as well as the new models for squirrel-cage induction machine, wound rotor induction machine, salient-poles synchronous machine wind turbine blockset in matlab simulink download permanent magnet synchronous machines have been included in this library.

Some special features, as deep-bar effect in the rotor of the induction machines, are also included in models. Further extensions of the models источник g.

Simulinkk important feature of the abc abc machine models is that the dynamic equations are written in per-phase quantities. Therefore, the desired winding-connection b,ockset be obtained e g. Besides turbime complete dynamic models of induction machine some reduced order models have been developed and implemented in the advanced aero elastic tool HAWC [35].

In the first stage the focus has been in modelling of the induction machine and some special models including deep-bar effect, reduced order models neglecting the stator transients and steady state models have been developed. Next step is to extend the library with the corresponding models for the synchronous machine both field winding and permanent magnet.

Since all these electrical machines models involves a relatively big number of derivates for the state variables two methods have been chosen in order to implement the models in Simulink: using Simulink blocks and C S-Function. In Fig. The third library contains models for power converters based on switching functions.

At the moment the following models are available: 3-phase diode bridge rectifier, voltage source converter VCSglockset and different modulation strategies turbime power converters, as shown in Fig. Using two VSC blocks connected via a DC-link circuit a back-to-back converter topology can be obtained. The connection type of the soft-starter can извиняюсь, bratz 4 real pc download аналоги? selected from the mask interface, e g. The switching models include minimum pulse width, dead-time compensation and pulse dropping.

This library contains models related with the grid connection of the wind turbine blockset in matlab simulink download turbines as shown in Wind turbine blockset in matlab simulink download. Some relevant models from this library are:. The model is implemented both using Simulink blocks and C S-Function. As in a dynamic model of a wind turbine there are several transformations адрес страницы the signals, a wind turbine blockset in matlab simulink download library, which contains the main transformations, has been implemented as shown in Fig.

Wind turbine blockset in matlab simulink download basic transformations are from abc to dqo arbitrary reference and the opposite one, as well as from a dq signal to the complex representation of it. In order to take the connection type into account, some transformations from a three-phase system in phase quantities to a three-phase one but in line-to-line quantities have been implemented.

In order to find wind turbine blockset in matlab simulink download magnitude and the phase for a three-phase system the corresponding block can be used. This library contains some special blocks as: calculation of the period for a sinusoidal variable, calculation of the grid angle using a Phase Locked Loop system, calculation of the.

This library contains models related with the control of the wind turbine system.

 
 

Wind turbine blockset in matlab simulink download.Wind Turbine Blockset in Matlab Simulink

 

Added Ra version. Contact me for models compatible with other releases if what you want is not in this submission. Added Ra version and text for citing submission in other works. Made startup file compatible with Mac. Added Ra and Rb versions. Now uses variant subsystems with hyperlinks to control the configuration.

Run time parameter example added. Zip file updated with Ra version. Also includes versions for Rb, Ra, Ra, and Rb. Updated for Ra. Uses new Simscape-based SimDriveline library. The following figure shows the selected voltage vector for each sector to maintain the stator flux in the hysteresis bound. The applied vector control is based on a synchronously rotating, stator flux oriented d-q reference frame, which means that the d-axis is aligned with the vector of the grid voltage and the q component is zero.

We establish a regulation of the DC bus voltage to its reference by a PI corrector. The output of this corrector is the direct current reference. The current measured at the output of the inverter connecting the MADA to the network is transformed into its dq components.

By imposing the quadrature component of reference voltage to zero, and then, performing the regulation of the direct and quadrature components of the output voltage of the network side converter, we obtain the two components voltage to be imposed. After decoupling and compensation procedures, followed by transformation into Cartesian coordinates, we define the control signals of the converter with a simple modulation based on level comparators.

Diagram of Voltage Oriented Control of Grid side converter. Simulations were performed to show the behavior of the Doubly Fed Induction generator connected to the grid by a bi-directional converter. The torque reference value is deduced from the regulation of the wind generator speed according to the wind speed and using a PI corrector.

In this example, we have used three levels of wind speed. We have chosen to present the results corresponding to the rotation speed evolution, the electromagnetic torque, the flux evolution in the subspace and the stator currents.

Stator flux in the phase plane. Phase current time evolution. Time evolution of mechanical speed and electromagnetic torque. The Direct Torque Control DTC is an important alternative method for the doubly fed induction machine drive based wind turbine, with its high performance and simplicity.

The control of the DFIG connected to the grid with back to back converter, using two control techniques: DTC for the rotor side converter and Voltage Oriented Control for the grid converter present good performance and undulations reduction. Finally, we can conclude that the control methods applied to DFIG present most interest and contribute to improvement of system response performances. The first investigations, presented here, of the DFIG control prove its effectiveness and its high dynamics.

It will be completed in a future work by considering others control techniques and particularly limiting torque undulations and resolving the problem of variable switching frequency. Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.

Edited by Vasilios Katsikis. Published: September 26th, Katsikis Book Details Order Print. Impact of this chapter. Introduction In the last years, Matlab-Simulink has become the most used software for modeling and simulation of dynamic systems.

Wind turbine model This model is based on the steady-state power characteristics of the turbine. Wind turbine control For example, the wind turbine doubly fed induction generator is studied. Power control The power is controlled in order to follow a pre-defined power-speed characteristic. Reactive power control The reactive power at grid terminals or the voltage is controlled by the reactive current flowing in the rotor converter. Pitch angle control The pitch angle is kept constant at zero degree until the speed reaches point D speed of the tracking characteristic.

Advantages of DFIG in wind turbine systems The doubly-fed induction generator phasor model is the same as the wound rotor asynchronous machine see the Machines library with the following two points of difference: Only the positive-sequence is taken into account, the negative-sequence has been eliminated. The DFIG, in the wind turbine system, presents the following attractive advantages: The active and reactive power can be controlled independently via the current of the rotor; The magnetization of the generator can be achieved via the rotor circuit and not necessarily via the grid.

In this part, the dynamic model of DFIG in the dq frame is succinctly presented. Dynamic model of DFIG in terms of dq windings The general model for wound rotor induction machine is resumed as follows. Rotor flux and torque control For the control of the electromagnetic torque, we can use a three level hysteresis comparator which permits to have the two senses of motor rotation. Switching table As mentioned below, the Direct Torque Control of DFIG is directly established through the selection of the appropriate stator vector to be applied by the inverter.

Table 1. Table 2. Voltage vector selected for each sector S i. References 1. Akagi H. Kanazawa Y. Komatsu Y. Kawabata T. Phase Active. Power Filter. Proceedings of. International Symposium. Guimaraes Portugal. Jami A. Hosseini S. Implementation of. Trans On Electrical Eng. Lecci A. Automatika 4. Zhao Z. Tomizuka M. The report provides first a quick overview over Matlab issues and then explains the structure of the developed toolbox. The attention in the report is mainly drawn to the description of the most important mathematical models, which have been developed in the Toolbox.

Then, some simulation results using the developed models are shown. Finally, some general conclusions regarding this new developed Toolbox as well as some directions for future work are made. Publication Date: Mar 01, Product Type: Technical Report. Research Organizations: Aalborg Univ.

One may think of each bar as being composed of several layers of equal cross section, and thus of equal resistance, but with inductances increasing with depth. Under running conditions, the slip is quite small and the frequency of the rotor currents is only 1 -2 Hz. As a result, the leakage reactance is neglected, and the current distribution is essentially uniform throughout each rotor bar.

The effective resistance of the rotor is that of all layers in parallel. This low resistance makes for low slip and high efficiency at full load. As the motor is overloaded, however, slip and frequency increase. Thus, the value of rotor leakage reactance in the circuit model becomes smaller and the value of rotor resistance becomes greater.

Another important need is to include the leakage path saturation effect into a reduced model. The main saturation leakage path is at the tooth tips over the closed or nearly closed slots [46]. However, large machines usually have large slots openings, and hence the leakage path saturation effect is not significant for large machines [3],.

Numerous approaches regarding the modelling of deep-bar effect have been presented in literature; therefore, all these models are complicated and require complex mathematics [3], [41], [42].

In [3] is presented a simplified approach for the modelling of deep bar effect, which gives accurate results. The equivalent rotor winding resistance and leakage reactance are modelled as follows:.

Therefore, this approach assumes a linear dependency of rotor resistance and rotor leakage reactance against the entire range of slip. Moreover, it requires extra parameters determined from tests at synchronous speed. Usually, the parameters from data sheets are given for rated operating point, near the synchronous speed and the method cannot be applied.

Based only on the parameters from datasheet, the equivalent rotor winding resistance and leakage inductance at any operating point can be modelled as:. This approach assumes that the parameters of induction machine are constant for the values of the slip less or equal with the breakdown slip.

Resistance and leakage reactance deep-bar factors can be determined based on rated voltage and current, starting current and phase angle from short-circuit test at rated current.

Then it can be corrected so that the calculated starting torque will fit the value from datasheet or test reports. Deep-bar effect for a 2 MW squirrel-cage induction machine as a function of slip: a rotor resistance rotor leakage reactance and b electromagnetic torque.

The same approach can be used for doubly fed induction machine since the manufacturers performs the standard tests as for the squirrel-cage induction machines. The Simulink model of induction machine, which implements the variation of the rotor parameters with the slip, is shown in Fig. Simulink model of the induction machine in dq rotor reference frame including deep-bar effect.

The mask interface for this model is shown in Fig. Mask interface for the induction machine in dq rotor reference frameincluding deep-bar effect. In order to include the deep-bar effect some additional parameters have been added in the mask interface: rated voltage and current, base frequency, number of pole pairs, starting current, phase angle at standstill. All these parameters are usually available in standard datasheets. The flux equations highlight the terms, which are dependent on magnetic saturation and therefore introduce non-linearity.

It will be assumed that the saturation of the leakage fluxes into a large induction machine can be neglected [33], [46] thus, the stator and rotor leakage inductances are constant. The magnetizing inductance is a function of magnetization current as shown in Fig. Assuming that the machine has magnetic, electric and geometric cylindrical symmetry, then the magnetic saturation caused by the main magnetic field is independent by the direction of this field and depends only on the absolute value of it.

The magnetizing flux can be written as:. The magnetization current is independent on the reference frame. Based on magnetization curve shown in Fig.

Based on the no-load curve for an induction machine these two inductances can be determined as a function of the no-load current. Then, using a mathematical approximation e g. Taking into account the above mentioned, the phasor voltage equations of the induction machine in the general reference frame including the saturation of the main path can be written as follow:.

Considerable attention has been paid during the last years in modelling of iron losses into an induction machine. A simple search in IEEE database will produce around results.

All these papers deals with the iron loss modelling for an inverter-fed induction motor and take into account the hysteresis losses as well as the eddy-current losses in a wide range of speed and frequency. In wind turbine applications usually a large squirrel-cage induction generator is directly connected to grid and the rotor speed is almost fixed. When a doubly fed machine is used, again the stator windings are directly connected to the grid and the variable speed operation is achieved using a power converter in the rotor side.

In data sheets the no-load power, current and power factor are provided for the machine rated voltage as well as the electrical parameters for the rated operating point. So, it is convenient to use only this information in the case of a large induction machine, both squirrel-cage and wound rotor. A classical approach in iron losses modelling for an induction machine involves a resistance inserted in parallel with the magnetizing reactance in the equivalent per-phase diagram, as shown in Fig.

One major drawback of this approach is that the magnetizing current is divided into two components: an active component and a reactive component. So, it is difficult to use this equivalent diagram for a dynamic model as well as for a steady state analysis. A modified equivalent scheme, called T has been developed. Unfortunately, the currents in this equivalent scheme are multiplied with some factors and the dynamic modelling become difficult.

A simple approach assumes the iron losses resistance in series with the magnetizing reactance as shown in Fig. Where the parameters of the magnetizing branch can be determined based on parameters from Fig. Since the machine manufacturers give the electrical parameters for both schemes presented in Fig. The electrical parameters for the parallel mode can be transformed through some simple mathematical calculations to the series mode equivalent circuit.

Recalling 4. A similar approach can be used to introduce the iron loss resistance into the dynamic equations written in arbitrary reference frame. The dynamic equations of synchronous machine are derived for a salient pole machine with damping bars, which is the most complicated model for this type of machine [7], [9], [21], [33], [34], [46], [75]. This model can be also used for a non-salient pole machine assuming identical values for inductances in d- and g-axis. In synchronous machines with salient poles the damping bars can be represented by a direct- and a quadrature-axis damping winding, which are short-circuited windings.

Assume that on the stator of the machine there is a symmetrical three-phase sinusoidal distributed stator winding and on the rotor there are the field winding and direct- and quadrature-axis damper winding. Schematic of the machine is shown in Fig.

The voltage equations of the field winding and the damper windings in the reference frame fixed to the rotor are as follows:. Replacing the three-phase stator winding by an equivalent quadrature-phase stator winding, the number of differential equations can be reduced. Schematic of the corresponding model is shown in Fig.

It can be shown that when the stator quantities of the salient pole machine are expressed in the d-q-o reference frame fixed to the rotor, the components of the stator flux linkages expressedin the rotor reference frame will not contain the rotor angle. This corresponds to the commutator model of the salient-pole machine. This approach is useful for studying the un- symmetric behaviour of the synchronous machine.

It follows that in the rotor reference frame, under linear conditions, the salient pole machine can be described by a system of voltage equations with constant coefficients and, in general, the only changing quantity is the rotor speed in these equations. Thus, the stator equations in phasor form in the rotor reference frame are given by:.

The stator flux linkages in the d-q-o rotor reference frame can be expressed in terms of the currents of the machine as:. Splitting 4. The voltage equations of the field winding and the direct- and quadrature-axis damper windings can be obtained in the reference frame fixed to the rotor as:.

Match case Limit results 1 per page. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Downloaded from orbit. General overview and description of the models Iov, F. Author: others Post on Jul 5 views. Category: Documents 0 download.

General overview and description of themodels Iov, F. Mechanical Components Library. Electric Machinery library based on Simulink blocks. Electric machinery C S-Functionbased models.

Content of the Power Converters Library. Common Blocks Library. Content of the Transformations Library. Some of these models e g. Measurements Library. Content of the Control Blocks Library. Simulink model of induction machine in Simulink. Simulink implementation of dynamic equations for Model A.

 

(PDF) Wind Turbine Blockset in Matlab Simulink | brahmaiah upputuri – replace.me.Wind Turbine Model – File Exchange – MATLAB Central

 

Open перейти. Submitted: April 2nd, Published: September 26th, In the last years, Matlab-Simulink has wind turbine blockset in matlab simulink download the most used software for modeling and simulation of dynamic systems.

It provides a powerful graphical interface for building and verifying new mathematical models as well as new control strategies particularly for non linear systems. The study of wind turbine systems generators are an example of such dynamic systems, containing subsystems with different ranges of the time constants: wind, turbine, generator, power electronics, transformer and grid. There are two principle-connections of wind energy conversion.

The first one is connecting the wind-generator to grid at grid frequency. While connected to grid, grid supplies the reactive VAR required for the induction machines. Often, a DC-link is required to interface the wind-generator system with a certain control technique to the utility grid.

The взято отсюда is connecting the wind-generator system to isolated load in продолжение здесь areas. A wound rotor induction machine, used as a Doubly Fed Induction Generator DFIG wind turbines are nowadays becoming more widely used in wind power generation.

The DFIG connected with back to back converter at the rotor terminals provide a very economic solution for variable speed application. Three-phase alternative supply is fed directly to the stator in order to reduce the cost instead of feeding through converter and inverter. For the control of these converters different techniques will be adopted. This method involves the transformation of the currents into a synchronously rotating dq reference frame that is aligned with one of the fluxes. Also, we have chosen to develop the case mobil 1 british rally championship pc a conventional neural controller associated with a reference model, represented by a Fuzzy logic corrector, for the learning phase is used to control the generator speed.

An overview of Matlab Simulink, particularly the blocks concerned by the study of wind turbine generators based on DFIG will be presented. SimPowerSystems DEMOS present good support and examples for the study of power systems and particularly the components of the wind generation energy systems. These tools can help for modeling and simulating basic electrical wind turbine blockset in matlab simulink download and detailed electrical power systems.

These tools let you model the generation, transmission, distribution, and consumption of electrical power, as well as its conversion into mechanical power. SimPower Systems is well suited to the development of complex, self-contained power systems, such as those in automobiles, aircraft, manufacturing plants, and power utility applications. In this chapter, we will be focalized on the following sections to show how we can use these libraries to develop a model of electrical generation based wind systems in step by step.

Reference value of the torque given by a PI controller which parameters are adapted by a fuzzy logic inference system. Speed control bused a PI adapted by a Fuzzy logic inference system. Control of DFIG speed based on a fuzzy neural corrector. In order to analyze the dynamic behaviour of a wind turbine generation systems, different blocksets exist in the Matlab Simulink environment.

The power scheme of the wind generation system can be divided into many blocs:. The wind turbine or a simulator based on electrical machines for the comportment of this turbine. The principal object is to convert the aerodynamic variables particularly wind power under variable wind speeds to the mechanical power.

In this chapter, we have chosen to show the simulation of wind turbine associated with a doubly fed induction generator. Structure of wind turbine coupled to DFIG. In this продолжить, two converters; the rotor-side converter and the grid-side converter, are Voltage-Sourced Converters that use forced-commutated power electronic devices Wind turbine blockset in matlab simulink download.

A coupling inductor L is used to connect the inverter to the grid. The three-phase rotor winding is connected to the rectifier by slip rings and brushes and the three-phase stator winding is directly connected to the grid. The power captured by the wind turbine is converted into electrical power by the induction generator and it is transmitted to the grid by the stator and the rotor windings.

The control system generates the pitch angle command and the voltage command signals for the rectifier and the inverter respectively in order to control the power of the wind turbine, the DC bus voltage and the reactive power or the voltage at the grid terminals.

This model is based on the steady-state power characteristics of the turbine. In fact, to simulate the behavior of the wind turbine, the torque that it exerts on the mechanical shaft must verify the relation:. This equation, based on the modeling turbine wind turbine blockset in matlab simulink download, is represented as:. The torque reference corresponding to a level of wind turbine speed and generator speed is evaluated as represented by the following scheme.

A second model of wind turbine behavior could be the use of a DC machine to generate the reference mechanical torque corresponding to the wind speed plan.

A separately excited DC machine is used, in this case, with the control of the field terminals and the armature circuit connected to converters.

The inputs are respectively the rotor speed and electromagnetic torque of the generator. Estimation of reference torque general and detailed schemes. The reference field current is deduced from a lockup table with rotor speed as entry.

The mechanical torque deduced form a wind and rotor speeds permits to impose the armature current. Second blackjack pc download of turbine based DC machine. For example, the wind turbine doubly fed induction generator is studied. The operating principle of the power flow is described as follows:. Generally, Pr is only a fraction of Ps the absolute value of slip is much lower than 1 and the sign of Продолжить is opposite to the slip sign.

Pr is transmitted to or is taken out wind turbine blockset in matlab simulink download DC bus capacitor. The control of grid converter permits to generate or absorb the power Pgc in order to keep the DC voltage constant.

In steady-state for a loss less converters, Pgc is equal to Pr. The converters have the capability of generating or absorbing reactive power and could be used to узнать больше the reactive power or the voltage at the grid terminals.

The rotor-side converter is used to control the wind turbine output power and the voltage or reactive power measured at the grid terminals. The grid-side converter is used to regulate the voltage of the DC bus capacitor.

The power is controlled in order to follow a pre-defined power-speed characteristic. An example of such a characteristic showing also tracking characteristic represented by the ABCD curve, is illustrated in the following figure. We can note that between points B and Жмите сюда, the tracking characteristic is the locus wind turbine blockset in matlab simulink download the maximum power of the http://replace.me/23808.txt maxima of the turbine power versus turbine speed curves.

For the power control loop, the actual electrical output power, wind turbine blockset in matlab simulink download at the grid terminals of the wind turbine, is added to the total power losses mechanical and electrical and is compared with the reference power obtained from the tracking characteristic. A Proportional-Integral regulator is used and wind turbine blockset in matlab simulink download output is the reference rotor current that must be injected in the rotor by the rotor converter. This is the current component that produces the electromagnetic torque Tem.

The reactive power at grid terminals or the voltage is controlled by http://replace.me/19218.txt reactive current flowing in the rotor converter. When the wind turbine is operated in var regulation mode the reactive power at grid terminals is kept constant by a var regulator. The output of the voltage regulator or the var regulator is the reference d-axis current that must be injected in the rotor by the rotor converter.

The same current regulator as for the power control is used to regulate the actual direct rotor current of positive-sequence current to its reference value. The rotor side converter ensures a decoupled active and reactive stator power control, Ps and Qs, according to the reference torque delivered by the Maximum Power Point Tracking control MPPT.

The grid side converter control the power flow exchange with the grid via the rotor, by maintaining the dc bus at a constant voltage level and by imposing the reactive power QL at zero. The pitch angle is kept constant at zero degree until the speed reaches point D speed of the tracking characteristic. Beyond point D, the pitch angle is proportional to the speed deviation from point D speed. The control system is illustrated in the following figure. Pitch angle control. The doubly-fed induction generator phasor model is the same as the wind turbine blockset in matlab simulink download rotor asynchronous machine see the Machines library with the following two points of ОЧЕНЬ mozzy tryna win free download диз)). A trip input has been added.

When this input is high, the induction generator is disconnected from the grid and from the rotor converter. The magnetization of the generator can be achieved via the rotor circuit and not necessarily via the grid.

The DFIG is capable of producing reactive power that it is delivered through the grid-side converter. Usually, this converter operates under constant unity power factor and it is not involved in reactive power trading with the grid. Also, the DFIG can be regulated in order to produce or consume a certain wind turbine blockset in matlab simulink download of reactive power. This way, the voltage control is achieved in cases of weak distribution grids. The converter size is not determined according to the total power of the generator but according to the decided speed range of the machine and therefore the slip range.

The selected speed range is decided according to the economical optimization and the increased performance of the system. Referring to the model developed in Matlab Simulink and defining the different parameters of the induction machines DFIG in particularlythe DFIG equations can be resumed as follows:. In most practical work, the DFIG will have a non-unity turns ratio, n witch must be included in the flux linkage equations.

Also, it will be useful to define the d- and q-axis magnetizing current. Including magnetizing currents and turns ratio, the flux linkage equations must be rewritten and finally the electrical model of the machine is schematised as follow case of d-axis seen from stator :. Electrical model in d-axis seen from stator. To control the torque and power factor of a doubly fed machine used in wind power generation system, a Direct Torque Control DTC method is adopted.

As well known, a DTC technique is based on switching table which permits to choose an adequate inverter voltage vector to be applied to the converter according to flux and torque errors. These ones are deduced by a comparison between the references and estimated or measured values of flux and torque. For the control of the electromagnetic torque, we can use a three level hysteresis comparator which permits to have the two senses of motor rotation.

Three level hysteresis comparator. A two level hysteresis comparator could be used for the control of the flux. Flux hysteresis corrector. The wind turbine blockset in matlab simulink download value of the torque is given by a PI controller which is able to reach the reference speed. The PI parameters are adapted by a fuzzy logic inference system. Torque reference estimation. The rotor flux amplitude is controlled in order to keep the unity power factor of the rotor current and rotor voltage.

This is obtained if the rotor flux amplitude has to be the orthogonal projection of the stator vector.