scholarly journals Improving Transient Behavior of a Brushless Doubly Fed Induction Generator through Reactive Current Control of Grid-Side Converter

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1413
Author(s):  
Ahsanullah Memon ◽  
Mohd Wazir Mustafa ◽  
Muhammad Naveed Aman ◽  
Abdul Hafeez ◽  
Mukhtar Ullah
Keyword(s):  
Voltage Drop ◽  
Transient Behavior ◽  
Current Control ◽  
Voltage Fluctuations ◽  
Inductive Load ◽  
Reactive Current ◽  
Doubly Fed ◽  
Grid Side ◽  
Rotor Side Converter ◽  
Grid Side Converter

Brushless doubly-fed induction generators have higher reliability, making them an attractive choice for not only offshore applications but also for remote locations. These generators are composed of two back-to-back voltage source converters, a grid side converter and a rotor side converter. Existing techniques use the rotor side converter for reactive current control; however, it is more suitable for stabilizing steady state behavior. In order to stabilize the voltage fluctuations at the point of common coupling (PCC) due to sudden inductive load introduction, the grid side converter may be a better choice due to faster response and higher control bandwidth. Therefore, this paper proposes a control scheme for the grid side converter to suppress the PCC voltage fluctuations when a large inductive load is suddenly connected. The proposed technique is based on an analytical model of the transient behavior of the voltage drop at the PCC. The analysis shows that reactive current control using the grid side converter introduces a double fundamental frequency component to the PCC voltage. To block this harmonic, we designed a notch filter. The simulation results in Matlab/Simulink show that the proposed technique can not only significantly reduce the voltage drop but also results in an 82% reduction in voltage distortion at the PCC.

scholarly journals The voltage dip and doubly fed induction generator with considering uncertainty conditions

2020 ◽  
Vol 9 (1) ◽  
pp. 30-38 ◽  
Author(s):  
Zahra Rafiee ◽  
Mansour Rafiee ◽  
Mohammad Reza Aghamohammadi
Keyword(s):  
Reactive Power ◽  
Transient Behavior ◽  
Imperialist Competitive Algorithm ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Voltage Dip ◽  
Doubly Fed ◽  
Grid Side ◽  
Rotor Side Converter ◽  
Grid Side Converter

The paper presents the transient behavior of the doubly fed induction generator (DFIG) in the wind turbine (WT) in the normal and voltage dip condition. When voltage dip occurs in to the grid, the rotor current increases and the DC-link voltage increases too and start to oscilate. In this paper, the proportional integral (PI) controllers are used to control the DFIG-basedwind farms for regulating the electronic devices including rotor side converter (RSC) and grid side converter (GSC) to control the active and reactive power of DFIG. The PI parameters are tuned by imperialist competitive algorithm (ICA). So, the transient behavour of the DFIG-based WF is explors when the voltage dip occurs. Hence, the induced electric motive force in to the rotor is measured. Also, an existed uncertainty for mutual inductance is considered caused by saturated curve during three-phase fault conditions and the bahavour of DFIG-based WT is examined and analyzed. All of simulation is done by Matlab/Simulink®.

Research on the Control Strategy of DFIG Grid Side Converter under Unbalanced Grid Voltage Conditions

2012 ◽  
Vol 260-261 ◽  
pp. 454-459
Author(s):  
Fei Song ◽  
Dan Zhu ◽  
Kan Tang ◽  
Xue Jing Liu
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Voltage Drop ◽  
Current Control ◽  
Transient Model ◽  
Grid Voltage ◽  
Doubly Fed ◽  
Grid Side ◽  
Grid Side Converter ◽  
The Impact

This paper studies on the electromagnetic transient model of doubly-fed wind turbine grid-side converter under the imbalanced grid condition. And on this basis, the paper analysis the impact of doubly-fed converter when grid voltage asymmetric drop. It puts forward a dual PLL and dual current control combination of doubly-fed converter grid side control strategy. This strategy achieves grid voltage positive and negative sequence fast separation when asymmetric grid voltage drop occur, achieves the active output power secondary fluctuate suppression under the imbalanced grid voltage condition, avoids DC voltage rise at the fault moment and also achieves converter reactive power support under the imbalanced grid fault. The simulation and experimental results show that the proposed control strategy is correct and with the application value of engineering

scholarly journals Dynamic Low Voltage Ride through Detection and Mitigation in Brushless Doubly Fed Induction Generators

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4461
Author(s):  
Ahsanullah Memon ◽  
Mohd Wazir Mustafa ◽  
Muhammad Naveed Aman ◽  
Mukhtar Ullah ◽  
Tariq Kamal ◽  
...  
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Low Voltage ◽  
Voltage Drop ◽  
Low Voltage Ride Through ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Reactive Current ◽  
Doubly Fed ◽  
Rotor Side Converter

Brushless doubly-fed induction generators have higher reliability, making them an attractive choice for not only offshore applications but also for remote locations. These machines are composed of two back-to-back voltage source converters: the grid side converter and the rotor side converter. The rotor side converter is typically used for reactive current control of the power winding using the control winding current. A low voltage ride through (LVRT) fault is detected using a hysterisis comparison of the power winding voltage. This approach leads to two problems, firstly, the use of only voltage to detect faults results in erroneous or slow response, and secondly, sub-optimal control of voltage drop because of static reference values for reactive current compensation. This paper solves these problems by using an analytical model of the voltage drop caused by a short circuit. Moreover, using a fuzzy logic controller, the proposed technique employs the voltage frequency in addition to the power winding voltage magnitude to detect LVRT conditions. The analytical model helps in reducing the power winding voltage drop while the fuzzy logic controller leads to better and faster detection of faults, leading to an overall faster response of the system. Simulations in Matlab/Simulink show that the proposed technique can reduce the voltage drop by up to 0.12 p.u. and result in significantly lower transients in the power winding voltage as compared to existing techniques.

scholarly journals Vector Analysis and Optimal Control for the Voltage Regulation of a Weak Power System with Wind Energy and Power Electronics

2018 ◽  
Vol 10 (6) ◽  
pp. 1
Author(s):  
Nick Schinas
Keyword(s):  
Optimal Control ◽  
Reactive Power ◽  
Voltage Drop ◽  
Voltage Regulation ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Novel Strategy ◽  
Doubly Fed ◽  
Grid Side ◽  
Grid Side Converter

This paper deals with the voltage regulation in a weak system which contains large inductive loads and wind turbines using Doubly Fed Induction Generators (FDIGs). The DFIGs demand large amounts of reactive power from the grid and as a result, there is a voltage drop in the system which may be extra deteriorated if large inductive loads and motors are also present in the same line.  The problem of the voltage regulation in these cases is treated with the installation of a Static Var Compensator (SVC) besides the capability of the DFIGs to partially regulate the voltage themselves. In this paper, new modeling procedures based on optimal control are developed for the design of the SVC controller and a novel strategy for the grid side converter of the DFIG is presented. The nonlinear system is simulated in the SIMULINK software so that the performance of the new controllers is validated. 

scholarly journals Simulation and Analysis of DFIG System with Wind Turbine Implementing Fuzzy Logic Control

2019 ◽  
Vol 8 (6) ◽  
pp. 2764-2771
Keyword(s):  
Fuzzy Logic ◽  
Wind Turbine ◽  
Fuzzy Logic Controller ◽  
Reactive Power ◽  
Current Control ◽  
Control Voltage ◽  
Active And Reactive Power ◽  
Grid Side ◽  
Rotor Side Converter ◽  
Grid Side Converter

A doubly-fed induction generator (DFIG) applied to wind power generation driven by wind turbine is under study for low voltage ride-through application during system unbalance. Use of DFIG in wind turbine is widely spreading due to its control over DC voltage and active and reactive power. Conventional dq axis current control using voltage source converters for both the grid side and the rotor side of the DFIG are analyzed and simulated. An improved control and operation of DFIG system under unbalanced grid voltage conditions by coordinating the control of both the rotor side converter (RSC) and the grid side converter (GSC) is done in this thesis. Simulation and analysis of DFIG system with wind turbine using Fuzzy logic controller for RSC and GSC under unbalanced condition is presented in the positive synchronous reference frame. The common DC-link voltage is controlled by grid side converter and control of DFIG’s stator output active and reactive power is controlled by rotor side converter. The steady-state operation of the DFIG and its dynamic response to voltage sag resulting from a remote fault on the 120-kV system is shown in this thesis using controllers. Modeling of DFIG system under Fuzzy logic controller to control voltage and active-reactive powers is done using MATLAB/SIMULINK.

scholarly journals Control & Design for FOPID Based Line-Side Converter of the Brushless Doubly-Fed Induction Generator

2020 ◽  
Vol 10 (2) ◽  
pp. 148-152
Keyword(s):  
Reactive Power ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Power Extraction ◽  
Wind Energy Conversion ◽  
Doubly Fed ◽  
Grid Side ◽  
Static Compensator ◽  
Rotor Side Converter ◽  
Grid Side Converter

This paper deals with the operation of doubly fed induction generator (DFIG) with an integrated active filter capabilities using grid-side converter (GSC). The main contribution of this work lies in the control of GSC for supplying harmonics in addition to its slip power transfer. The rotor-side converter (RSC) is used for attaining maximum power extraction and to supply required reactive power to DFIG. This wind energy conversion system (WECS) works as a static compensator (STATCOM) for supplying harmonics even when the wind turbine is in shutdown condition. Control algorithms of both GSC and RSC are presented in detail. The proposed DFIG-based WECS is simulated using MATLAB/Simulink.

scholarly journals Harmonics Reduction using a Modified Controller for Doubly Fed Induction Generator

2021 ◽  
Vol 9 (5) ◽  
pp. 45-50
Author(s):  
Ahmed Hassan Adel ◽  
Salama Abo-Zaid ◽  
Mahmoud Elwany
Keyword(s):  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Simulink Model ◽  
Simulation Results ◽  
Doubly Fed ◽  
Grid Side ◽  
Rotor Side Converter ◽  
Grid Side Converter

This paper discusses a control system for the converter of doubly fed induction generator (DFIG) driven by wind energy. The converter of DFIG consists of two main parts; rotor side converter (RSC) and grid side converter (GSC). Two advanced control methods for GSC are presented here in this paper; vector control strategy based on pulse width modulation (PWM) and direct power control (DPC). DPC is based on switching table for voltage vector selection. In addition to grid voltage position, direct and quadrature current components are used here as inputs to the switching table instead of active and reactive powers respectively. This paper proposes a modified switching table for DPC to reduce ripples and total harmonic distortion (THD) of current produced by GSC. A Simulink model for 9 MW wind system based on DFIG is given in this paper. Simulation results are given for PWM, DPC and Proposed system for GSC. In view of THD calculations and simulation results a comparative study and conclusion are given in the end of this paper.

scholarly journals A Novel Inter Connection of DFIG with Grid in Separate Excitation SMES System with Fuzzy Logic Control

2015 ◽  
Vol 4 (1) ◽  
pp. 43-52
Author(s):  
A. Kavitha ◽  
A. V. Suresh
Keyword(s):  
Superconducting Magnet ◽  
Active Power ◽  
Excitation System ◽  
Induction Generators ◽  
Logic Control ◽  
Doubly Fed Induction Generators ◽  
Doubly Fed ◽  
Grid Side ◽  
Rotor Side Converter ◽  
Grid Side Converter

The use of doubly fed induction generators (DFIGs) in wind turbines has become quite common over the last few years. DFIG wind turbine is an integrated part of distributed generation system. This paper presents a Fuzzy based controller SMES unit in DFIG for improving the ac output on grid side. The excitation system is composed of the rotor-side converter, the grid-side converter, the dc chopper and the superconducting magnet. The superconducting magnet is connected with the dc side of the two converters, which can handle the active power transfer with the rotor of DFIG and the power grid independently, even thou Sutton small fluctuations are occur in active power on AC side. For smoothening the AC output power waveform a Fuzzy based controller is introduced in SMES controller unit, which implemented using simulation developed in MATLAB/ SIMULINK 7.2 version. The model of the FUZZY controlled SMES based excitation system for DFIG is established, and the simulation tests are performed to evaluate the system performance.

Controller Parameters Optimization of PWM Converter Based DFIG

2014 ◽  
Vol 672-674 ◽  
pp. 1012-1015
Author(s):  
He Zhu ◽  
Da Tian Xu ◽  
Hao Ran Zhao
Keyword(s):  
Control Strategy ◽  
Simplex Algorithm ◽  
Parameters Optimization ◽  
Pwm Converter ◽  
Stator Flux ◽  
Grid Side ◽  
Rotor Side Converter ◽  
Grid Side Converter ◽  
And Control ◽  
The Mathematical Model

Based on the mathematical model of the PWM converter, control strategy of the grid-side converter directed by the grid voltage and control strategy of the rotor-side converter directed by the stator flux were established combining the vector control theory. The method using the nonlinear simplex algorithm to optimize the PI control parameters of the DFIG unit was first proposed, optimization results proved that this method had good practicality and robustness.

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