Journal articles: 'DFIG-DC System'

1

Sun, Yuliang, Shaomin Yan, Bin Cai, and Yuqiang Wu. "Maximum Power Point Tracking of DFIG with DC-Based Converter System Using Coordinated Feedback Linearization Control." Mathematical Problems in Engineering 2018 (November 11, 2018): 1–12. http://dx.doi.org/10.1155/2018/9642123.

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This paper presents a coordinated feedback linearization strategy (CFLS) for DC-based doubly-fed induction generator (DFIG) system to track the maximum power point. The stator and rotor of DFIG are connected to DC grid directly by two voltage source converters. Compared with a traditional DFIG system, the DC-based DFIG system has more system inputs and coupling, which increases the difficulty of vector control strategy. Accordingly, CFLS is proposed to make DFIG operate at the maximum power point (MPP), and two aspects are improved: first a single-loop control is adopted to make DFIG operate steady and accurate under coordinated the control of RSC and SSC. Second system control laws are obtained by the feedback linearization strategy that achieves DC-based DFIG system decoupling fully during the MPPT and system control. Simulations are carried out the comparison between CFLS and conventional vector control (VC), and it shows that the control performance of CFLS is superior.

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Touaiti, Bilel, Hechmi Ben Azza, Mongi Moujahed, and Mohamed Jemli. "Fault-Tolerant Voltage Source Converter for Wind-Driven Doubly Fed Induction Generator Connected to a DC Load." Journal of Circuits, Systems and Computers 27, no. 10 (May 24, 2018): 1850153. http://dx.doi.org/10.1142/s0218126618501530.

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This paper presents a fault-tolerant Voltage Source Converter (VSC) for Field Oriented Control (FOC) of a stand-alone Doubly Fed Induction Generator (DFIG) connected to a DC load. In the proposed topology, the stator of the DFIG is connected to a DC load through a diode rectifier, while the rotor is connected to the DC load through a VSC. This topology allows the integration of DFIG in the hybrid system with other sources of production and storage, such as photovoltaic system, connected to the same DC bus. The fault-tolerant VSC consists in incorporating a fourth leg to replace the faulted leg. A fault detection scheme for switch device open-circuit faults is proposed in this study. The novelty of this method consists in analyzing the rotor currents within normal and faulty operating modes. Simulation results are presented for a 3.7[Formula: see text]kW DFIG-DC system with single open-circuit faults that validate the methods presented in this study. The effectiveness of the proposed fault detection method has been validated experimentally by using dSpace DS1104 control board based on TMS320F240 real time Digital Signal Processor (DSP).

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Mosaad, Mohamed I., Ahmed Abu-Siada, Mohamed M. Ismaiel, Hani Albalawi, and Ahmed Fahmy. "Enhancing the Fault Ride-through Capability of a DFIG-WECS Using a High-Temperature Superconducting Coil." Energies 14, no. 19 (October 3, 2021): 6319. http://dx.doi.org/10.3390/en14196319.

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With the increase in doubly fed induction generator-based wind energy conversion systems (DFIG-WECS) worldwide, improving the fault ride-through (FRT) capability of the entire system has been given much attention. Enhancement of the FRT capability of a DFIG-WECS is conventionally realized by employing a flexible AC transmission system device with a proper control system. This paper presents a non-conventional method for the improvement of the FRT of DFIG-WECS, using a high-temperature superconducting coil interfaced with the DC-link of the rotor and stator side converters through a DC-chopper. A fractional-order proportional-integral (FOPI) controller is utilized to regulate the DC-chopper duty cycle in order to properly manage the power flow between the DC-link and the coil. Two optimization techniques, Harmony Search and Grey Wolf Optimizer, are employed to determine the optimum size of the superconducting coil along with the optimum parameters of the FOPI controller. The effectiveness of the two proposed optimization techniques is highlighted through comparing their performance with the well-known particle swarm optimization technique.

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Alam, Md, Mohammad Abido, Alaa Hussein, and Ibrahim El-Amin. "Fault Ride through Capability Augmentation of a DFIG-Based Wind Integrated VSC-HVDC System with Non-Superconducting Fault Current Limiter." Sustainability 11, no. 5 (February 26, 2019): 1232. http://dx.doi.org/10.3390/su11051232.

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This paper proposes a non-superconducting bridge-type fault current limiter (BFCL) as a potential solution to the fault problems of doubly fed induction generator (DFIG) integrated voltage source converter high-voltage DC (VSC-HVDC) transmission systems. As the VSC-HVDC and DFIG systems are vulnerable to AC/DC faults, a BFCL controller is developed to insert sizeable impedance during the inception of system disturbances. In the proposed control scheme, constant capacitor voltage is maintained by the stator VSC (SVSC) controller, while current extraction or injection is achieved by rotor VSC (RVSC) controller. Current control mode-based active and reactive power controllers for an HVDC system are developed. Balanced and different unbalanced faults are applied in the system to show the effectiveness of the proposed BFCL solution. A DFIG wind-based VSC-HVDC system, BFCL, and their controllers are implemented in a real time digital simulator (RTDS). The performance of the proposed BFCL control strategy in DFIG-based VSC-HVDC system is compared with a series dynamic braking resistor (SDBR). Comparative RTDS implementation results show that the proposed BFCL control strategy is very efficient in improving system fault ride through (FRT) capability and outperforms SDBR in all cases considered.

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El Azzaoui, Marouane, Hassane Mahmoudi, and Karima Boudaraia. "Backstepping Control of wind and photovoltaic hybrid Renewable Energy System." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 3 (September 1, 2016): 677. http://dx.doi.org/10.11591/ijpeds.v7.i3.pp677-687.

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This paper deals with the interconnected grid hybrid renewable energy system (HRES). The wind energy conversion system (WECS), is built around a wind turbine coupled to a doubly fed induction generator (DFIG). The stator of DFIG is directly related to the grid and the rotor is connected to the grid through back-to-back power converters. The proposed algorithm combines the nonlinear Backstepping approach and the eld orientation applied to control the DFIG. In a rst step, this technique is applied to the side converter rotor (RSC), to control the electromagnetic torque and reactive power, and secondly, it is applied to the grid side converter (GSC) to control the power exchanged with the grid and regulate the DC bus voltage. The PV energy system is composed by the PV array and the DC-DC boost converter which controlled by the MPPT method to extract the optimal power. Simulations results present the performances in terms of set point tracking, stability, and robustness with respect to the variation in wind speed and irradiation.

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Kavitha, A., and A. V. Suresh. "A Novel Inter Connection of DFIG with Grid in Separate Excitation SMES System with Fuzzy Logic Control." Bulletin of Electrical Engineering and Informatics 4, no. 1 (March 1, 2015): 43–52. http://dx.doi.org/10.11591/eei.v4i1.312.

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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.

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Riouch, Tariq, and Cristian Nichita. "Advanced control strategy of DFIG during symmetrical grid fault." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 3 (September 1, 2021): 1422. http://dx.doi.org/10.11591/ijpeds.v12.i3.pp1422-1430.

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This article proposes a novel scheme to improve the doubly-fed induction generator (DFIG) behavior during grid fault. The DFIG’s are sensitives to voltage variations when abrupt variations of the wind velocity arrive. For enhancing DFIG behavior, protecting the converters, and smoothing the fluctuations power output of the DFIG under sag voltage; a novel hybrid energy storage system scheme and its controller are proposed. The main advantages of our approach are a faster response and suppressing overvoltage on DC bus and globally less stress in the storage system. The control structure decreases the tiredness on the battery and restores the DC bus voltage rapidly, globally the battery system operating time increases. The results obtained by simulations in MATLAB validate the benefits of the suggested control.

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Mohanty, Kanungo Barada, Satish Choudhury, and Madhu Singh. "Vector Control Realization of DFIG Under Grid Abnormalities using Real Time Digital Simulator." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 4 (December 1, 2016): 1337. http://dx.doi.org/10.11591/ijpeds.v7.i4.pp1337-1347.

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A grid connected doubly-fed induction generator (DFIG) system, driven by variable speed wind turbine is considered in this research to satisfy grid code requirements. Remaining grid synchronized and stable under voltage sag and voltage swell, obtaining power control through dc link voltage control, and providing unity power factor at grid terminals are the achievements. The DFIG system uses two back-to-back converters. Vector control strategy is used with the grid side and rotor side converters, and taken up for research for further improvement. The grid side converter controls dc-link voltage and maintains unity power factor at the grid connection point. The rotor side converter supplies the reactive power of the machine and maintains the speed constant irrespective of the transient behavior of the grid. In this paper the behavior of the DFIG system is analyzed under grid voltage fluctuation and the experimental results are obtained using RT-LAB. Main contribution of this work is in improving the DFIG system performance with grid low voltage and over voltage ride through capability through simulation, and its real time experimental verification.

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Noussi, Karim, Abdelmajid Abouloifa, Hanane Katir, Ibtissam Lachkar, and Fouad Giri. "Nonlinear control of grid-connected wind energy conversion system without mechanical variables measurements." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 2 (June 1, 2021): 1139. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp1139-1149.

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This article addresses the problem of controlling an overall wind energy conversion system (WECS) formed by a wind turbine connected to the grid via a doubly fed introduction generator (DFIG) and an AC/DC/AC converter. The main control objectives are fourfold: (i) designing an output feedback speed controller that makes the DFIG rotate at the optimal value delivered by the MPPT strategy, (ii) controlling the stator reactive power so as to be null, (iii) guaranteeing the DC-link voltage in the grid side converter to be at a given constant value, (iv) ensuring a unitary power factor. A high gain observer is synthesized, in order to provide estimated values of the mechanical variables. To achieve the control objectives, a sliding mode controller involving the mechanical observer is designed. The performance of the system configuration based on the 2MW-DFIG with the proposed controller is evaluated by a numerical simulation under a realistic wind profile using MATLAB/SIMULINK/SimPowerSystems environment.

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Zouheyr, Dekali, Baghli Lotfi, and Boumediene Abdelmadjid. "Real-Time Emulation of a Grid-Connected Wind Energy Conversion System Based Double Fed Induction Generator Configuration under Random Operating Modes." European Journal of Electrical Engineering 23, no. 3 (June 21, 2021): 207–19. http://dx.doi.org/10.18280/ejee.230305.

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This paper presents the design, modeling, simulation and the experimental implementation of a 1.5 kW relatively low-cost wind energy conversion system (WECS) based on the double fed induction generator (DFIG) configuration. In the preliminary experiments, we test the DFIG power control under fixe speed by applying the vector control principle, then we insert the physical emulator presented in the controlled DC motor in order to simulate the static-dynamic behaviors of a real wind turbine with the use of the Tip Speed Ratio TSR based MPPT algorithm to extract the maximum available power on the emulator. The proposed structure is simulated using MATLAB Simulink environment, the obtained results are validated experimentally on our laboratory setup. We also develop an application with MATLAB AppDesigner that calculates the operating point of our system at steady state and visualize the power transfer, current, voltage and electromagnetic torque values of the DFIG and the DC motor before starting the stimulation or the experimental manipulation. The MPPT, the DC motor control and the DFIG power control algorithms are implanted in C, embedded on a dSPACE DS1104 control board. The obtained results confirm the reliability of the proposed WECS to manage all the probable operating modes, also the effectiveness of the physical simulator in the role of wind turbine emulation.

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Wang, Jing Biao, Xi Wang Abuduwayiti, Qin Chao, and Qing Luo. "Modal Research on the Low-Frequency Oscillation of AC/DC System with DFIG-Based Wind Farms." Applied Mechanics and Materials 672-674 (October 2014): 331–36. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.331.

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Low-frequency oscillation characteristics of AC / DC system with DFIG-based wind farms were studied. Detailed mathematical pure AC and AC / DC system model were established by considering the effects of doubly-fed wind turbine model and DC transmission dynamic model to do small signal stability analysis. The computed results of small signal stability of DFIG-based wind farms integrating pure AC CEPRI36 nodes system or with DC transmission that operated in four connection modes including bipolar neutral grounding at both ends mode, monopole ground return mode, monopole metallic return mode , monopole and two parallel conductor mode with earth return were investigated by using modal analysis method. Then, the characteristics of local oscillation modes and inter-area oscillation modes were respectively analyzed under the two operation modes of the wind farm participating active power dispatching and reactive power dispatching and consequently some new conclusions were drawn.

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12

Misra, Himanshu, Akhila Gundavarapu, and Amit Kumar Jain. "Control Scheme for DC Voltage Regulation of Stand-Alone DFIG-DC System." IEEE Transactions on Industrial Electronics 64, no. 4 (April 2017): 2700–2708. http://dx.doi.org/10.1109/tie.2016.2632066.

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13

Zhou, Huiying, Siyang Ge, and Liang Qin. "Coordinate Fault Ride-Through Strategy for Connection of Offshore Wind Farms Using Voltage Source-Converter-Based High-Voltage Direct-Current Transmission under Single Polar Fault." Sensors 23, no. 12 (June 20, 2023): 5760. http://dx.doi.org/10.3390/s23125760.

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In a system where wind farms are connected to the grid via a bipolar flexible DC transmission, the occurrence of a short-time fault at one of the poles results in the active power emitted by the wind farm being transmitted through the non-faulty pole. This condition leads to an overcurrent in the DC system, thereby causing the wind turbine to disconnect from the grid. Addressing this issue, this paper presents a novel coordinated fault ride-through strategy for flexible DC transmission systems and wind farms, which eliminates the need for additional communication equipment. The proposed strategy leverages the power characteristics of the doubly fed induction generator (DFIG) under different terminal voltage conditions. By considering the safety constraints of both the wind turbine and the DC system, as well as optimizing the active power output during wind farm faults, the strategy establishes guidelines for the wind farm bus voltage and the crowbar switch signal. Moreover, it harnesses the power regulation capability of the DFIG rotor-side crowbar circuit to enable fault ride-through in the presence of single-pole short-time faults in the DC system. Simulation results demonstrate that the proposed coordinated control strategy effectively mitigates overcurrent in the non-faulty pole of flexible DC transmission during fault conditions.

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Rajendran, Senthilnathan, Vigneysh Thangavel, Narayanan Krishnan, and Natarajan Prabaharan. "DC Link Voltage Enhancement in DC Microgrid Using PV Based High Gain Converter with Cascaded Fuzzy Logic Controller." Energies 16, no. 9 (May 6, 2023): 3928. http://dx.doi.org/10.3390/en16093928.

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Renewable-based sources can be interconnected through power electronic converters and connected with local loads and energy storage devices to form a microgrid. Nowadays, DC microgrids are gaining more popularity due to their higher efficiency and reliability as compared to AC microgrid systems. The DC Microgrid has power electronics converters between the DC loads and renewable-based energy sources. The power converters controlled with an efficient control algorithm for maintaining stable DC bus voltage in DC microgrids under various operating modes is a challenging task for researchers. With an aim to address the above-mentioned issues, this study focuses on the DC link voltage enhancement of a DC Microgrid system consisting of PV, DFIG-based wind energy conversion system (WECS), and battery Energy Storage System (ESS). To elevate PV output voltage and minimize the oscillations in DC link voltage, a high-gain Luo converter with Cascaded Fuzzy Logic Controller (CFLC) is proposed. Droop control with virtual inertia and damping control is proposed for DFIG-based WECS to provide inertia support. Artificial Neural Network (ANN) based droop control is utilised to regulate the ESS’s State of Charge (SOC). The effectiveness of the proposed converter and its control algorithms for maintaining stable DC bus link voltage has been analysed using MATLAB/Simulink and experimentally validated using a prototype model and FPGA Spartan 6E controllers.

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Shukla, Rishabh Dev, Ramesh Kumar Tripathi, and Padmanabh Thakur. "DC grid/bus tied DFIG based wind energy system." Renewable Energy 108 (August 2017): 179–93. http://dx.doi.org/10.1016/j.renene.2017.02.064.

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Bharti, O. P., R. K. Saket, and S. K. Nagar. "Controller Design of DFIG Based Wind Turbine by Using Evolutionary Soft Computational Techniques." Engineering, Technology & Applied Science Research 7, no. 3 (June 12, 2017): 1732–36. http://dx.doi.org/10.48084/etasr.1231.

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This manuscript illustrates the controller design for a doubly fed induction generator based variable speed wind turbine by using a bioinspired scheme. This methodology is based on exploiting two proficient swarm intelligence based evolutionary soft computational procedures. The particle swarm optimization (PSO) and bacterial foraging optimization (BFO) techniques are employed to design the controller intended for small damping plant of the DFIG. Wind energy overview and DFIG operating principle along with the equivalent circuit model is adequately discussed in this paper. The controller design for DFIG based WECS using PSO and BFO are described comparatively in detail. The responses of the DFIG system regarding terminal voltage, current, active-reactive power, and DC-Link voltage have slightly improved with the evolutionary soft computational procedure. Lastly, the obtained output is equated with a standard technique for performance improvement of DFIG based wind energy conversion system.

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Zou, He Ping, Peng Yu, Hui Sun, Ji Yan Zou, Jian Liu, and Yan Liu. "Fault Ride through of Doubly Fed Induction Generator Wind Turbine Based on Supercapacitors Energy Storage." Applied Mechanics and Materials 130-134 (October 2011): 2851–54. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2851.

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This paper proposes a low voltage ride through (LVRT) scheme of doubly fed induction generator (DFIG) based on the supercapacitors energy storage. The novel control strategy of the bi-directional converter and the grid side converter is established. Simulation model of the DFIG system is developed. Simulation results show that the presented scheme can efficiently reduce the DC-link overvoltage, supply reactive power to the power system through grid side converter, and help grid recovery under system fault, improving the LVRT capability of the system.

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Jiang, Neng Qian, and Yi Feng Xie. "Coordinated Control of Large Scale Offshore Wind Farms Integrating into VSC-HVDC System." Advanced Materials Research 724-725 (August 2013): 546–54. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.546.

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VSC-HVDC has become prior transmission way in delivering off-shore wind power. This paper studies offshore wind system based on DFIG (Doubly Fed Induction Generator) wind turbine. The control strategy of the system during the normal and fault condition are studied. In the normal condition, the GSVSC are operated by controlling constant frequency, voltage and phases. During the fault condition, the GSVSC converted to limit current model and dc voltage link are controlled by DFIG-RSC converter. These control strategies are validated in good performance in PSCAD/EMTDC platform.

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Gomez, Luis A. G., Ahda P. Grilo, M. B. C. Salles, and A. J. Sguarezi Filho. "Combined Control of DFIG-Based Wind Turbine and Battery Energy Storage System for Frequency Response in Microgrids." Energies 13, no. 4 (February 18, 2020): 894. http://dx.doi.org/10.3390/en13040894.

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This paper presents a novel methodology for frequency control of a microgrid through doubly fed induction generator (DFIG) employing battery energy storage system (BESS) and droop control. The proposed microgrid frequency control is the result of the active power injection from the droop control implemented in the grid side converter (GSC) of the DFIG, and the BESS implemented in the DC link of the back-to-back converter also in the DFIG. This methodology guarantees the battery system charge during operation of the connected DFIG in the network, and the frequency control in microgrid operation after an intentional disturbance. In order for the DFIG to provide frequency support to the microgrid, the best-performing droop gain value is selected. Afterwards its performance is evaluated individually and together with the power injected by the battery. The power used for both battery charging and frequency support is managed and processed by the GSC without affecting the normal operation of the wind system. The simulation tests are performed using Matlab/Simulink toolbox.

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Kandavel, B., G. Uvaraj, and M. Manikandan. "Comparative Study of Total Harmonic Distortion in Multilevel Inverters Based WECS." International Journal of Engineering & Technology 7, no. 3.1 (August 4, 2018): 42. http://dx.doi.org/10.14419/ijet.v7i3.1.16794.

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This paper presents comparative study of Total Harmonic Distortion (THD) and its individual harmonic contents without grid and with grid for Diode clamped multi level inverter (DCMLI) and Flying capacitor clamped multilevel inverter (FCMLI) based Doubly Fed Induction Generator (DFIG) employing PI and Fuzzy logic controller (FLC). Simple method to control for a variable speed wind energy conversion system with a DFIG is connected to the grid through a diode rectifier and a diode clamped multilevel inverter (DCMLI). The DC-link voltage is controlled through a DC-DC boost converter to keep the DC voltage at constant value. Inverter is controlled by sinusoidal pulse width modulation technique, which supplies power to the grid. The THD and its harmonic content are studied for different wind speeds. DFIG fed flying capacitor multi level inverter (FCMLI) based WECS connected to load as well as grid. FCMLI is controlled through sinusoidal pulse width modulation. Voltage and current harmonics are studied. The results of both multilevel inverters are compared. It shows that the level of harmonic content of two types of multilevel inverters working at different wind speeds indicates that Total Harmonic Distortion (THD) for DCMLI has given best results.

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Lee, Yoo, Yoon, and Jang. "Advanced Fault Ride-through Strategy by an MMC HVDC Transmission for Off-Shore Wind Farm Interconnection." Applied Sciences 9, no. 12 (June 20, 2019): 2522. http://dx.doi.org/10.3390/app9122522.

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In order to solve the problems brought upon by off-shore wind-power plants, it is important to improve fault ride-through capability when an on-shore fault occurs in order to prevent DC overvoltage. In this paper, a coordinated control strategy is implemented for a doubly-fed induction generator (DFIG)-based off-shore wind farm, which connects to on-shore land by a modular multilevel converter (MMC)-based high voltage direct current (HVDC) transmission system during an on-shore fault. The proposed control strategy adjusts the DC voltage of the off-shore converter to ride through fault condition, simultaneously varying off-shore AC frequency. The grid-side converter detects the frequency difference, and the rotor-side converter curtails the output power of the DFIG. The surplus energy will be accumulated at the rotor by accelerating the rotor speed and DC link by rising DC voltage. By the time the fault ends, energy stored in the rotor and energy stored in the DC capacitor will be released to the on-shore side to restore the normal transmission state. Based on the control strategy, the off-shore wind farm will ride through an on-shore fault with minimum rotor stress. To verify the validity of the proposed control strategy, a DFIG-based wind farm connecting to the on-shore side by an MMC HVDC system is simulated by PSCAD with an on-shore Point of Common Coupling side fault scenario.

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Gharsellaoui, Lema, and Moez Ghariani. "Isolated Site Wind System Start-Up System." International Journal of Security and Privacy in Pervasive Computing 13, no. 2 (April 2021): 29–50. http://dx.doi.org/10.4018/ijsppc.2021040103.

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The abundant energy available in nature can be harnessed and converted to electricity in a sustainable way to supply the necessary power to elevate the living standards of the people without access to the electricity grid. Wind power is one of the cleanest and safest of all the renewable commercial methods of generating electricity. However, wind energy is difficult to use due to its stochastic variability. Energy storage can overcome the main drawback. This article consists of studying a wind starting system based on DFIG and operating in isolated mode. This system is formed by a bank of batteries and a bidirectional DC/DC converter charging a DC bus voltage as well as these batteries. The control of this system required a cascade control. Such control needs two loops: the inside loop to control the inductive current and the outside one for continuous voltage bus. The theoretical study of this command has been validated using PSIM software.

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Thin, Aye Myat, and Nang Saw Yuzana Kyaing. "Performance Analysis of Doubly Fed Induction Generator Using Vector Control Technique." International Journal of Electrical and Computer Engineering (IJECE) 5, no. 5 (October 1, 2015): 929. http://dx.doi.org/10.11591/ijece.v5i5.pp929-938.

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There are many solar power and wind stations installed in the power system for environmental and economic reasons. In fact, wind energy is inexpensive and the safetest among all sources of renewable energy, it has been recognized that variable speed wind turbine based on the doubly fed induction generator. It is the most effective with less cost and high power yield. This paper has chosen doubly fed induction generator for a comprehensive study of modelling, performance and analysing. DFIG wind turbine has to operate below and above synchronous speed which requires smooth transition mode change for reliable operation to be controlled to provide stability for the power system. Hence its performance depends on the generator itself and the converter operation and control system. This paper presents completed mathematical model of DFIG with its AC/DC/AC converter driven by DC machine. The rotor is considered fed by a voltage source converter whereas the stator is connected to the grid directly. The capacity of the wind power generation is 1.5MW. The voltage rating and frequency for this system are 575V, 50Hz .This paper show detailed model of DFIG.

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Yan, Shaomin, Aimin Zhang, Hang Zhang, and Jianhua Wang. "Control scheme for DFIG converter system based on DC-transmission." IET Electric Power Applications 11, no. 8 (September 1, 2017): 1441–48. http://dx.doi.org/10.1049/iet-epa.2016.0430.

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Suresh, Jadapalli, Bolleddu Mohan Kumar, Gunji Suresh, Gadde Ravi Varma, Kunchala Murali, Dr C. Rajalingam, and Dr R. Shankar. "Integration of Renewable Energy Generating Sources with Micro-Grid." International Journal of Innovative Research in Engineering and Management 9, no. 2 (April 30, 2022): 667–76. http://dx.doi.org/10.55524/ijirem.2022.9.2.107.

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The management of remote sites' hybrid wind-and-solar energy-powered micro grids. The battery bank is connected to a shared DC bus from the double fed induction generator (DFIG), which is the device used to convert wind energy. The conversion of solar energy takes place in photovoltaic (PV) arrays. On the common DC bus of DFIG, a DC-DC boost converter efficiently consumes solar energy. The line-side converter with drooping characteristics' indirect vector control is used to regulate the voltage and frequency. It slows the overcharging or discharging of the battery by altering the frequency reference dependent on the battery's energy level. You can run this system without using wind energy. Maximum power point tracking (MPPT) is a component of control algorithms for wind and solar systems. In addition to having external power support to charge the battery without the need for additional power, this system is designed for completely automated operation, taking into account all of the actual system conditions. The system's simulation model is created in the MATLAB environment, and the simulation results are presented in a variety of ways. Low battery charge state, imbalanced load, impervious to wind or sunlight, and non-linear. A 3.7kW wound rotor asynchronous machine and a 5kW photovoltaic array simulator are used to execute the system and produce experimental results that confirm the theoretical model and design.

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P Suresh Babu and Dr. S N V Ganesh. "Power Management Strategy between PV-Wind Hybrid System Using Cuckoo MPPT Techniques." November 2020 6, no. 11 (November 22, 2020): 12–17. http://dx.doi.org/10.46501/ijmtst061103.

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The main theme of this paper is to maintain a power management strategy in grid interfaced hybrid system. Here, the PV and Wind Energy Systems considered hybrid connection systems. Wind and PV systems are more efficient DG systems, as freely available in nature. The DFIG based wind system is designed to generate 16kW and Solar system is designed for rating of 20kW power generation. In addition with battery management system also used for back-up purpose. An MPPT based DC-DC converters are proposed for both PV and Wind systems to improve the reliability and effective power management between the systems under different load conditions. This proposed system is verified in MATLAB simulink environment

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Azizi, Kiarash, Murtaza Farsadi, and Mohammad Farhadi Kangarlu. "Efficient Approach to LVRT Capability of DFIG-Based Wind Turbines under Symmetrical and Asymmetrical Voltage Dips Using Dynamic Voltage Restorer." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 2 (June 1, 2017): 945. http://dx.doi.org/10.11591/ijpeds.v8.i2.pp945-956.

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The capability of low-voltage ride-through (LVRT) of doubly fed induction generator (DFIG) has been considered as an essence for grid code requirements. Any unbalance on the grid side causes the rotor current of the generator to rise which leads to saturate the dc-link of the back-to-back converter or even destroy it. To meet this requirement, a dynamic voltage restorer (DVR) without dc-link energy storage elements is utilized to compensate any disturbance imposed to the DFIG wind turbine system. On the time of any disturbance or fault, DFIG and DVR are properly controlled in order to compensate the specified faulty phase uninterruptedly. DVR is connected in series to the grid and by injecting instantaneous compensating voltage, prevents the stator voltage from rapid changing; consequently, the rotor side converter can accomplish its normal operation. As voltage dips are the most common grid faults subjected to DFIGs, this paper investigates both symmetrical and asymmetrical voltage dips caused by grid faults. The independent and instantaneous phase voltage compensation, less volume, weight, and cost are the merits to utilize the proposed DVR along with DFIG wind turbines. PSCAD/EMTDC based simulations verifies the capabilities of the proposed technique for the LVRT capability of DFIG.

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Swain, Snehaprava, and Pravat Kumar Ray. "Fault Analysis in a Grid Integrated DFIG Based Wind Energy System with NA CB_P Circuit for Ridethrough Capability and Power Quality Improvement." International Journal of Emerging Electric Power Systems 17, no. 6 (December 1, 2016): 619–30. http://dx.doi.org/10.1515/ijeeps-2016-0095.

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Abstract In this paper a three phase fault analysis is done on a DFIG based grid integrated wind energy system. A Novel Active Crowbar Protection (NACB_P) system is proposed to enhance the Fault-ride through (FRT) capability of DFIG both for symmetrical as well as unsymmetrical grid faults. Hence improves the power quality of the system. The protection scheme proposed here is designed with a capacitor in series with the resistor unlike the conventional Crowbar (CB) having only resistors. The major function of the capacitor in the protection circuit is to eliminate the ripples generated in the rotor current and to protect the converter as well as the DC-link capacitor. It also compensates reactive power required by the DFIG during fault. Due to these advantages the proposed scheme enhances the FRT capability of the DFIG and also improves the power quality of the whole system. Experimentally the fault analysis is done on a 3hp slip ring induction generator and simulation results are carried out on a 1.7 MVA DFIG based WECS under different types of grid faults in MATLAB/Simulation and functionality of the proposed scheme is verified.

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Gundavarapu, Akhila, Himanshu Misra, and Amit Kumar Jain. "Direct Torque Control Scheme for DC Voltage Regulation of the Standalone DFIG-DC System." IEEE Transactions on Industrial Electronics 64, no. 5 (May 2017): 3502–12. http://dx.doi.org/10.1109/tie.2016.2644623.

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Misra, Himanshu, and Amit Kumar Jain. "Analysis of Stand-Alone DFIG-DC System and DC Voltage Regulation With Reduced Sensors." IEEE Transactions on Industrial Electronics 64, no. 6 (June 2017): 4402–12. http://dx.doi.org/10.1109/tie.2017.2669889.

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Kumar GB, Arjun, Shivashankar Shivashankar, and Keshavamurthy Keshavamurthy. "Design and control of grid-connected solar-wind integrated conversion system with DFIG supplying three-phase four-wire loads." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 2 (June 1, 2021): 1150. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp1150-1161.

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This paper describes the architecture and control of an autonomous hybrid solar-wind system (AHSWS) powered distributed generation system supplying to a 3ϕ-4 wire system. It includes a nonlinear controlling technique for maximum power point tracking (MPPT) used in doubly fed induction generator dependent wind energy translation scheme and solar photovoltaic system (SPVS). In the hybrid model, the DC/DC converter output from the PV system is explicitly coupled with the DC-link of DFIG's back-to-back converter. An arithmetical model of the device is developed, derived using a suitable d-q reference frame. The grid-voltage-oriented vector regulation is required to manage the GSC to keep the steady-state voltage of the DC bus and to adjust reactive power on the grid side. Also, the stator-voltageoriented control scheme offers a stable function of DFIG to regulate the RSC on the stator edge for reactive and active power management in this approach. DC/DC converter is being used to maintain the maximum power from SPVS. A Perturb & Observe method is used for tracing maximum power in an SPVS. The simulation designs of 4.0kW DFIG and 4.5kW solar array simulator are built-in SIMPOWER software kit of MATLAB, it is shown to achieve optimum efficiency under various mechanical and electrical circumstances. It can produce rated frequency and voltage in both scenarios.

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Giaourakis, Dimitrios G., Athanasios Safacas, and Savvas Tsotoulidis. "Simulation of a Double-Fed Induction Generator Wind Energy Conversion System under Healthy and Faulty Conditions." Advanced Materials Research 875-877 (February 2014): 1771–76. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1771.

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In this paper, the operation of a wind energy conversion system (WECS) incorporating a Double-Fed Induction Generator (DFIG), under various wind speeds and faulty conditions, is investigated through simulation. In this study the simulation of such a system (DFIG-WECS) was held by using the software Matlab/Simulink.. The simulation results are presented and evaluated for the issues of fault diagnosis and identification. More specifically, a DFIG-WECS has been simulated under various wind speeds and when a short-circuit occurs in the back-to-back converter and in the DC link from the point of view of these issues. In this work, it has been concluded that the investigated faults have caused a specific and unique harmonic content in grid, rotor and stator phase currents, which could be used for fault diagnosis and identification.

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Bekiroglu, Erdal, and Muhammed Duran Yazar. "MPPT Control of Grid Connected DFIG at Variable Wind Speed." Energies 15, no. 9 (April 25, 2022): 3146. http://dx.doi.org/10.3390/en15093146.

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In this study, maximum power point tracking (MPPT) control of a grid-connected doubly fed induction generated (DFIG)-based wind energy conversion system (WECS) at variable wind speed was designed and analyzed. The real wind speed data of the Edremit/Balıkesir region in Turkey was used as the wind speed profile. A N90/2.5 MW wind turbine model of Nordex Company was used in the study. Firstly, a conventional PI controller was applied to both rotor and grid side converters. The rotor-side converter (RSC) controls the power generated from the DFIG, whereas the grid-side converter (GSC) controls the DC bus voltage. An MPPT controller was applied to the RSC to generate reference torque at instant variable wind speeds. Thus, the system’s response time, electromagnetic torque, generated power, and grid-side currents parameters were improved. In the MPPT controller, the reference torque value is produced by using the angular velocity and reference angular velocity values of the DFIG. The proposed system was modeled and simulated in Matlab/Simulink. Generated power, DC bus voltage, response time, electromagnetic torque, and grid side currents results were obtained. The results of the conventional PI controller and the results of the PI controller with MPPT were compared. The results of the proposed control were also compared with the related studies. The results showed that the proposed system is reliable, applicable, and valid for the grid-connected DFIG at variable wind speeds.

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Bekiroglu, Erdal, and Muhammed Duran Yazar. "MPPT Control of Grid Connected DFIG at Variable Wind Speed." Energies 15, no. 9 (April 25, 2022): 3146. http://dx.doi.org/10.3390/en15093146.

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In this study, maximum power point tracking (MPPT) control of a grid-connected doubly fed induction generated (DFIG)-based wind energy conversion system (WECS) at variable wind speed was designed and analyzed. The real wind speed data of the Edremit/Balıkesir region in Turkey was used as the wind speed profile. A N90/2.5 MW wind turbine model of Nordex Company was used in the study. Firstly, a conventional PI controller was applied to both rotor and grid side converters. The rotor-side converter (RSC) controls the power generated from the DFIG, whereas the grid-side converter (GSC) controls the DC bus voltage. An MPPT controller was applied to the RSC to generate reference torque at instant variable wind speeds. Thus, the system’s response time, electromagnetic torque, generated power, and grid-side currents parameters were improved. In the MPPT controller, the reference torque value is produced by using the angular velocity and reference angular velocity values of the DFIG. The proposed system was modeled and simulated in Matlab/Simulink. Generated power, DC bus voltage, response time, electromagnetic torque, and grid side currents results were obtained. The results of the conventional PI controller and the results of the PI controller with MPPT were compared. The results of the proposed control were also compared with the related studies. The results showed that the proposed system is reliable, applicable, and valid for the grid-connected DFIG at variable wind speeds.

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Si Ali, Nadia Ben, Nora Zerzouri, and Nadia Benalia. "Modelling and power control of grid-connected wind energy system." Global Journal of Computer Sciences: Theory and Research 8, no. 2 (August 30, 2018): 87–95. http://dx.doi.org/10.18844/gjcs.v8i2.3152.

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Wind energy generation has attracted great interests in recent years. Doubly Fed Induction Generator (DFIG) for wind turbines are largely deployed because variable-speed wind turbines have many advantages over fixed-speed generation such as increased energy capture, operation at maximum power point, improved efficiency, and power quality. This paper presents the operation and vector control of a Doubly-fed Induction Generator (DFIG) system where the stator is connected directly to a stiff grid and the rotor is connected to the grid through bidirectional back-to-back AC-DC-AC converter. The basic operational characteristics , mathematical model of the aerodynamic system and vector control technique which is used to obtain decoupled control of powers are investigated using the software Matlab/Simulink.

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Laghridat, Hammadi, Ahmed Essadki, Maha Annoukoubi, and Tamou Nasser. "A Novel Adaptive Active Disturbance Rejection Control Strategy to Improve the Stability and Robustness for a Wind Turbine Using a Doubly Fed Induction Generator." Journal of Electrical and Computer Engineering 2020 (March 30, 2020): 1–14. http://dx.doi.org/10.1155/2020/9847628.

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A novel and robust active disturbance rejection control (ADRC) strategy for variable speed wind turbine systems using a doubly fed induction generator (DFIG) is presented in this paper. The DFIG is directly connected to the main utility grid by stator, and its rotor is connected through a back-to-back three phase power converter (AC/DC/AC). Due to the acoustic nature of wind and to ensure capturing maximum energy, a control strategy to extract the available maximum power from the wind turbine by using a maximum power point tracking (MPPT) algorithm is presented. Moreover, a pitch actuator system is used to control the blades’ pitch angle of the wind turbine in order to not exceed the wind turbine rated power value in case of strong wind speeds. Furthermore, the rotor-side converter is used to control the active and reactive powers generated by the DFIG. However, the grid-side converter is used to control the currents injected into the utility grid as well as to regulate the DC-link voltage. This paper aims to study and develop two control strategies for wind turbine system control: classical control by proportional integral (PI) and the proposed linear active disturbance rejection control (LADRC). The main purpose here is to compare and evaluate the dynamical performances and sensitivity of these controllers to the DFIG parameter variation. Therefore, a series of simulations were carried out in the MATLAB/Simulink environment, and the obtained results have shown the effectiveness of the proposed strategy in terms of efficiency, rapidity, and robustness to internal and external disturbances.

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Kroplewski, Paweł, Marcin Morawiec, Andrzej Jąderko, and Charles Odeh. "Simulation Studies of Control Systems for Doubly Fed Induction Generator Supplied by the Current Source Converter." Energies 14, no. 5 (March 9, 2021): 1511. http://dx.doi.org/10.3390/en14051511.

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The control system for a Doubly Fed Induction Generator (DFIG) supplied by a grid-connected Current Source Converter (CSC) is presented in this paper. Nonlinear transformation of DFIG model to the multi-scalar form is proposed. The nonlinear control strategy of active and reactive power of DFIG is realized by feedback linearization. In the proposed control scheme, the DFIG model and CSI parameters are included. Two Proportional-Integral (PI) controllers are dedicated for the control of the respective active and reactive powers. The control variables are the dc-link input voltage vector and the angular speed of the inverter output current. The proposed control approach is characterized by satisfactional dynamics and provides enhanced quality of the power transferred to the grid. In the simulation, evaluation of the characteristic operating states of the generator system, correctness of the feedback linearization and the dynamics of active and reactive power control loops are studied. Simulation results are adequately provided.

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Djebbar, Mohamed Salah, Aziz Boukadoum, and Abla Bouguerne. "Performances of a wind power system based on the doubly fed induction generator controlled by a multi-level inverter." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 1 (March 1, 2023): 100. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp100-110.

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The objective of this work is to study the contribution that the use of the multi-level inverter can make compared to a conventional two-level inverter, in a wind power production line (WPG) associated with a doubly fed induction generator (DFIG). The DFIG is driven by a variable speed wind turbine and operates in maximum power point tracking (MPPT) mode, for optimum efficiency. The rotor of the DFIG is supplied by a DC/AC inverter with five levels with MPC structure, controlled by the PWM technique, while the stator is connected with the network. The active and reactive powers exchanged between the DFIG and the network is achieved by indirect vector control with oriented stator flux (IFOC), with conventional regulators, ensuring zero reactive power and a unitary power factor. The total harmonic distortion (THD) of the current signals/voltages of the entire wind chain is exposed and criticized. The obtained results are very promising, offering the possibility for wind turbines with multi-level inverter to work in high voltage and large power.

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Arindya, Radita. "A Variable Speed Wind Generation System Based on Doubly Fed Induction Generator." Bulletin of Electrical Engineering and Informatics 2, no. 4 (December 1, 2013): 272–77. http://dx.doi.org/10.11591/eei.v2i4.193.

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Wind energy has become one of the most important and promising sources of renewable energy, which demands additional transmission capacity and better means of maintaining system reliability. The evolution of technology related to wind systems industry leaded to the development of a generation of variable speed wind turbines that present many advantages compared to the fixed speed wind turbines. These wind energy conversion systems are connected to the grid through Voltage Source Converters (VSC) to make variable speed operation possible. The studied system here is a variable speed wind generation system based on Doubly Fed Induction Generator (DFIG). The rotor side converter (RSC) usually provides active and reactive power control of the machine while the grid-side converter (GSC) keeps the voltage of the DC-link constant. The additional freedom of reactive power generation by the GSC is usually not used due to the fact that it is more preferable to do so using the RSC. However, within the available current capacity the GSC can be controlled to participate in reactive power generation in steady state as well as during low voltage periods. The GSC can supply the required reactive current very quickly while the RSC passes the current through the machine resulting in a delay. Both converters can be temporarily overloaded, so the DFIG is able to provide a considerable contribution to grid voltage support during short circuit periods. This report deals with the introduction of DFIG,AC/DC/AC converter control and finally the SIMULINK/MATLAB simulation for isolated Induction generator as well as for grid connected Doubly Fed Induction Generator and corresponding results and waveforms are displayed.

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Vasavi Uma Maheswari, M., Dr P. V. Ramana Rao, and . "Active & reactive powers control of DFIG placed with wind energy system by using hybrid controller." International Journal of Engineering & Technology 7, no. 4.5 (September 22, 2018): 662. http://dx.doi.org/10.14419/ijet.v7i4.5.25053.

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Here paper presents around the Active power along with Reactive power clout of a grid allied doubly fed Induction Generator (DFIG) with wind energy system (WES) employing PI & ANFIS controller. DFIG is formed adapting a d-q revolving allusion cage circuit with stator flux oriented, field oriented clout approach. By using a coterminous converter of Variable speed constant Frequency (VSCF) along with active the reactive power and DC tie voltage are controlled at sub and super synchronous speeds. An ANFIS has been coupled by a conventional PI controller in order to enhance the power controlling capability at steady state and voltage dip conditions

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Wang, Jun Rui, and Yan Ru Zhong. "DFIG Wind Power Generation Based on Direct Two-Stage Matrix Converter." Advanced Materials Research 383-390 (November 2011): 3578–85. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3578.

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In this paper, a topology for a doubly-fed induction generator (DFIG) using a direct Two-stage Matrix Converter (TSMC), connected between the stator and the rotor, is presented. The input stage is connected to the grid and provides the required dc voltage for the output stages. Space vector modulation is used for the input stage producing the maximum dc voltage, with unity power factor operation at the TSMC grid-side input. Each of the output stage is connected to the rotor of a DFIG. The control of the generator rotor currents is carried out using standard vector control approach with a reference frame aligned with stator flux. The entire system is modeled and the results are presented to show the feasibility of the proposed scheme.

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Song, Shaojian, Peichen Guan, Bin Liu, Yimin Lu, and HuiHwang Goh. "Impedance Modeling and Stability Analysis of DFIG-Based Wind Energy Conversion System Considering Frequency Coupling." Energies 14, no. 11 (June 1, 2021): 3243. http://dx.doi.org/10.3390/en14113243.

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Impedance-based stability analysis is an effective method for addressing a new type of SSO accidents that have occurred in recent years, especially those caused by the control interaction between a DFIG and the power grid. However, the existing impedance modeling of DFIGs is mostly focused on a single converter, such as the GSC or RSC, and the influence between the RSC and GSC, as well as the frequency coupling effect inside the converter are usually overlooked, reducing the accuracy of DFIG stability analysis. Hence, the entire impedance is proposed in this paper for the DFIG-based WECS, taking coupling factors into account (e.g., DC bus voltage dynamics, asymmetric current regulation in the dq frame, and PLL). Numerical calculations and HIL simulations on RT-Lab were used to validate the proposed model. The results indicate that the entire impedance model with frequency coupling is more accurate, and it is capable of accurately predicting the system’s possible resonance points.

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Ben Si Ali, Nadia, Nadia Benalia, and Nora Zerzouri. "Modelling and power control of grid connected wind energy system." Global Journal of Computer Sciences: Theory and Research 8, no. 1 (April 11, 2018): 14–23. http://dx.doi.org/10.18844/gjcs.v8i1.3286.

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Wind energy generation has attracted great interests in recent years. Doubly-fed induction generator (DFIG) for wind turbines (WTs) are largely deployed, because variable-speed WTs have many advantages over fixed-speed generation such as increased energy capture, operation at maximum power point, improved efficiency and power quality. This paper presents the operation and vector control of a DFIG system, where the stator is connected directly to a stiff grid and the rotor is connected to the grid through bidirectional back-to-back AC–DC–AC converter. The basic operational characteristics, mathematical model of the aerodynamic system and vector control technique, which is used to obtain decoupled control of powers, are investigated using the software Matlab/Simulink. Keywords: Wind turbine, doubly-fed induction generator, active and reactive power controller.

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Wu, Chao, Heng Nian, Bo Pang, and Peng Cheng. "Adaptive Repetitive Control of DFIG-DC System Considering Stator Frequency Variation." IEEE Transactions on Power Electronics 34, no. 4 (April 2019): 3302–12. http://dx.doi.org/10.1109/tpel.2018.2854261.

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Xiao, Yan, Babak Fahimi, Mario A. Rotea, and Yaoyu Li. "Multiple Reference Frame-Based Torque Ripple Reduction in DFIG-DC System." IEEE Transactions on Power Electronics 35, no. 5 (May 2020): 4971–83. http://dx.doi.org/10.1109/tpel.2019.2941957.

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Marques, Gil D., Sergio M. A. Cruz, and Matteo F. Iacchetti. "Minimum-Loss Control Strategy for a Dual-VSI DFIG DC System." IEEE Transactions on Industrial Electronics 67, no. 10 (October 2020): 8175–85. http://dx.doi.org/10.1109/tie.2019.2952822.

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Wu, Chao, Dao Zhou, and Frede Blaabjerg. "Direct Power Magnitude Control of DFIG-DC System Without Orientation Control." IEEE Transactions on Industrial Electronics 68, no. 2 (February 2021): 1365–73. http://dx.doi.org/10.1109/tie.2020.2970666.

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En-nay, Zineb, Ismail Moufid, Aboubakr El Makrini, and Hassane El Markhi. "Improved crowbar protection technique for DFIG using fuzzy logic." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 3 (September 1, 2022): 1779. http://dx.doi.org/10.11591/ijpeds.v13.i3.pp1779-1790.

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A doubly-fed induction generator is the most widely used as a wind turbine generator. Due to its drawbacks, doubly fed induction generator (DFIG) is extremely sensitive to grid disturbances, and the fragility of some components which are costly to the producer. Also, its acquisition value is very high in terms of maintenance time or component cost, causing substantial harm to both the energy production and power supplier. It is required that the DFIG components must be protected, especially power electronics devices and DC-Link capacitor. Therefore, this paper presents an improved crowbar strategy for DFIG. This method is based on the AI technique concept of utilizing a fuzzy logic controller. The main goal of this project is to improve the system performance by reducing the dangerous oscillations of electromagnetic torque, DC-link voltage, and rotor current during fault. This work consists of replacing the hysteresis control for the crowbar with fuzzy logic to realize crowbar-FLC. The proposed crowbar is based on free light chain (FLC) depending on rotor currents and DC-link voltage measurements. The control strategy is simulated in the MATLAB Simulink platform to evaluate the efficiency of the suggested technique.

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Mohammed, A. A. "Performance of Control Dynamics of Wind Turbine Based on Doubly Fed Induction Generator under Different Modes of Speed Operation." Conference Papers in Engineering 2013 (August 1, 2013): 1–9. http://dx.doi.org/10.1155/2013/125801.

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There are many solar power and wind stations installed in the power system for environmental and economic reasons. In fact, wind energy is inexpensive and the safest among all sources of renewable energy, it has been recognized that variable speed wind turbine based on the doubly fed induction generator is the most effective with less cost and high power yield. Therefore, this paper has chosen doubly fed induction generator for a comprehensive study of modeling, analyzing, and control. DFIG in wind turbine has to operate below and above the synchronous speed, which requires smooth transition mode change for reliable operation, specially, close to synchronous speed where the DFIGWT instability starts to appear. Furthermore, its output electric power has to be controlled to provide stability for the power system; hence its performance depends on the generator itself and the converter operation and control system. This paper presents completed mathematical model of DFIG with its AC/DC/AC converter driven by DC machine. A new vector control technique is designed and modeled, which allows to evaluate the dynamic performance of the controller under (below, above, and through synchronous speed). The simulation results demonstrate the accuracy and high performance of the new control system of DFIG for wind turbine, which provides smooth transition mode without using any extra circuit.

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Nazir, Muhammad Shahzad, Yeqin Wang, Ali Jafer Mahdi, Xinguo Sun, Chu Zhang, and Ahmed N. Abdalla. "Improving the Performance of Doubly Fed Induction Generator Using Fault Tolerant Control—A Hierarchical Approach." Applied Sciences 10, no. 3 (January 31, 2020): 924. http://dx.doi.org/10.3390/app10030924.

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The growth of using wind energy on a large scale increases the demand for wind energy conversion machines (WECMs), among these converters, the doubly-fed induction generator (DFIG) is the favorite choice. However, DFIG is very sensitive to wind speed variations and grid faults during operation. In order to overcome these undesirable characteristics, this paper proposes a hierarchical fault tolerant control (FTC) to improve the performance of DFIG. The hierarchical fault tolerant control (FTC) approach consists of pitch angle control (PAC) and maximum power point tracking (MPPT). This hierarchical approach demonstrates the robust response under various (low, rated, and high) wind speed ranges and reduces the undesirable DC voltage overshoots during short-circuit disorder. The simulation results are summarized in a logical table, which depicts the order of controlling scheme and operation for a sustainable energy generation system. The proposed control scheme achieved the healthy and the robust dynamic response without deteriorating the grid power quality or stressing the converters, and approved the effectiveness to suppress the DC voltage overshoots and tolerate the lower down short-circuit disorder to its rated range.

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Journal articles on the topic 'DFIG-DC System'

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