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.
Along with environmental consciousness enhancement, conventional energy depletion, wind energy exploitation is expanding gradually due to the renewable merit, clean without any pollution and vast reserve features. Therefore, wind power generation (WPG) system equipped with Doubly Fed Induction Generators is emerging as mushroom. Larger rated capacity of power unit, the higher tower and the variable...
The rapid development of wind power puts forward higher requirements on the simulation of wind turbine generator dynamic characteristics. Based on the Wind Turbine (WT) and Wind Turbine Induction Generator (WTIG) models contained in MATLAB/Simulink, this paper constructs the corresponding fixed-speed WTIG model on RTDS/RSCAD platform firstly. Secondly, the simulation methods adopted by MATLAB and...
Induction generators are the most popular in wind energy conversion system due to its simplicity and absence of synchronization problem. However the major drawback of this machine is its additional reactive burden on the electric network. This paper studies the voltage stability of wind farms (WFs) Connected to IEEE 14 bus network during system disturbances such as a load change, three phase fault...
To solve the problem of voltage fluctuation during the integration into grid and the operation of wind turbine groups, this paper proposes the voltage stability control method for Wind turbine group based on dynamic reactive power compensation. After the introduction of the theory, this paper discussed the voltage stability control strategy for Wind turbine group based on dynamic reactive power compensation...
This paper adopts a main circuit structure with back-to-back PWM converter, in which generator-side using direct torque control method, and grid-side adopts three-phase VSR inner current decoupling control based feed forward control algorithms, and this paper proposes an improved MPPT control methods, which can achieves more quickly and effectively tracking the maximum power. Finally, the effectiveness...
This paper presents analysis, design, and simulation for vector oriented control of three-phase voltage source pulse-width modulation (PWM) inverter which aims to optimize the utilization of wind power injected into the grid. To realize this goal, a digitally controlled converter-inverter system is proposed which provides economic utilization of the wind generator by insuring unity power factor operation...
A fifth order model of a doubly fed induction generator (DFIG) is proposed with stator flux orientation (SFO) vector control. Induction generator equipped with the as-built wind turbine scheme and grid system is modelled in MATLAB/SIMULINK. Different controllable parameters are identified. A control system is designed to improve the stability of the generator, which is connected with the back to back...
This paper proposes a ride-through technique of doubly-fed induction generator (DFIG) wind turbine systems. The control technique uses energy storage devices (ESD) which are controlled with current and power control loops. During grid faults, the generator output power can be reduced by increasing the generator speed, resulting in increased inertial energy of the rotational body. Also, the output...
Recent wind farm grid codes require wind generators to ride through voltage sags, which means that normal power production should be re-initiated once the nominal grid voltage has been recovered. This paper proposes a new control strategy using DFIGs (Doubly Fed Induction Generators) for stabilizing a wind farm composed of DFIGs and IGs (Induction Generators). Simulation analysis by using PSCAD/EMTDC...
A new constant-frequency double-rotor (CFDR) generator for the wind power generation is proposed in this paper. The CFDR generator needs only part-size power converter which is the same as that of the doubly-fed induction generator. As permanent magnets are mounted on the outer rotor of the CFDR generator, high performances may be achieved. In this paper, the structure of the double-rotor generator...
Low Voltage Ride Through (LVRT) technology of Doubly Fed Wind-Power Induction Generator (DFIG) is a very important issue for grid-connection of wind power system. The paper analyzed and simulated dynamic response of DFIG under gird voltage dip. Aiming at this problem, the paper proposed a whole set of LVRT control strategies for DFIG and designed a control logic diagram for the above strategies. In...
Fixed speed wind turbine generators system that uses induction generator as a wind generator has the stability problem similar to a synchronous generator. On the other hand, doubly fed induction generator (DFIG) has the flexibility to control its real and reactive powers independently while being operated in variable speed mode. This paper focuses on a scheme where IG is stabilized by using DFIG during...
This paper discusses the behavior of wind energy systems in grid fault events and existing strategies for these systems to ride through the faults. Various issues of wind power conversion systems with different generators in case of grid faults are described. Finally, existing enhancement methods of fault ride through capabilities to meet the main grid codes for each type of wind turbines are shown...
With the increasing wind power penetration, the wind farms are directly influencing the power systems. Therefore, analysis of wind power dynamics has become a very important issue, which justifies the need of a detailed dynamic model of wind power generation system. This paper approaches towards the study on the effect of wind speed variations and machine inertia constants on transient during initialization,...
The aim of this paper is to analyze the control of several wind power generators based on squirrel cage induction generators with one common power converter. This configuration is especially useful for offshore wind farms with a VSC-HVDC transmission. A comparison with a configuration where each generator is connected to one power converter, is done focusing in the total power extraction. Scalar-controlled...
The reactive power characteristics of doubly fed variable speed constant frequency (DFVSCF) wind power generator are important for grid's voltage stability and generator's low voltage ride-though (LVRT) capability. From the equivalent circuit of doubly-fed induction generator (DFIG), the balance equation of reactive power was deduced. Based on the balance equation, this paper first discussed the reactive...
The present work deals with the improvement of OWC-Wells turbine-generator systems by adequately choosing the applied control scheme. For this purpose, two different control strategies are presented and compared. In the first one, the control system does appropriately adapt the slip of the induction generator according to the pressure drop entry. The second control strategy consists of a traditional...
Low voltage ride-through (LVRT) requirements, listed in modern grid codes, have proven to be a significant technical issue for many wind turbine manufacturers. The LVRT requirements are usually defined by the transmission system operators at the point of common coupling (PCC) of wind farm to the power network. However, depending on the transformers configuration, the voltage sag conditions experienced...
This paper deals with the I.cos?? algorithm for the voltage and frequency control (VFC) of an autonomous wind power generation using an isolated asynchronous generator (IAG) feeding three-phase four-wire loads. The reference source currents are estimated using the I.cos?? algorithm to control the voltage and frequency of IAG system. Two-leg voltage source converter (VSC) with split capacitor and an...
This paper deals with an integrated electronic load controller (IELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The IELC is realised using a star/delta transformer and three-leg insulated gate bipolar transistors (IGBTs) -based current controlled voltage source converter (VSC) with a DC capacitor, a chopper...
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.