Relevant bibliographies by topics / Low voltage ride through (LVRT)

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Low voltage ride through (LVRT)'

Author: Grafiati
Published: 11 December 2022
Last updated: 11 June 2025

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Journal articles on the topic "Low voltage ride through (LVRT)"

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Zhang, Mei, Hai Qin Xue, and Shui Liang Zhou. "A Review on Low Voltage Ride-Through Solutions for PMSG Wind Turbine." Advanced Materials Research 1070-1072 (December 2014): 209–15. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.209.

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The exiting of wind turbines will cause the adverse effect on the power grid and its assembling unit in network voltage drops. So, direct-drive wind power generation system should meet the requirement of the certain ability of low voltage. This paper introduces the influence of wind power system with different structure by voltage drop as well as the disadvantage and advantage on LVRT. The relate regulations based on LVRT are analyzed. The existing LVRT technologies of direct-drive wind power systems are briefly presented. The characteristics of each scheme from the different LVRT technology are analyzed. Moreover, further study of LVRT for PMSG is pointed out.
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Ma, Chao-Tsung, and Zong-Hann Shi. "A Distributed Control Scheme Using SiC-Based Low Voltage Ride-Through Compensator for Wind Turbine Generators." Micromachines 13, no. 1 (2021): 39. http://dx.doi.org/10.3390/mi13010039.

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As the penetration of renewable energy power generation, such as wind power generation, increases low voltage ride-through (LVRT), control is necessary during grid faults to support wind turbine generators (WTGs) in compensating reactive current to restore nominal grid voltages, and maintain a desired system stability. In contrast to the commonly used centralized LVRT controller, this study proposes a distributed control scheme using a LVRT compensator (LVRTC) capable of simultaneously performing reactive current compensation for doubly-fed induction generator (DFIG)-, or permanent magnet synchronous generator (PMSG)-based WTGs. The proposed LVRTC using silicon carbide (SiC)-based inverters can achieve better system efficiency, and increase system reliability. The proposed LVRTC adopts a digital control scheme and dq-axis current decoupling algorithm to realize simultaneous active/reactive power control features. Theoretical analysis, derivation of mathematical models, and design of the control scheme are initially conducted, and simulation is then performed in a computer software environment to validate the feasibility of the system. Finally, a 2 kVA small-scale hardware system with TI’s digital signal processor (DSP) as the control core is implemented for experimental verification. Results from simulation and implementation are in close agreement, and validate the feasibility and effectiveness of the proposed control scheme.
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Dong, He Nan, Yun Dong Song, Gang Wang, and Zuo Xia Xing. "Low Voltage Ride through of Wind Turbine Based on New SGSC Converter Structure." Applied Mechanics and Materials 448-453 (October 2013): 2185–90. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2185.

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The proportion of wind power in power systems is increasing year by year. Large-scale wind turbine off the grid when grid system failures. So the wind turbine needs to low voltage ride through (LVRT) function of wind turbine. Aiming at this problem, which in this article by DIgSILENT simulation software build 1.5MW doubly-fed wind turbine(DFIG) model, using active Crowbar and series grid side converter (SGSC) control strategy to realize the simulation of low voltage ride through of wind turbine. The control strategy of active Crowbar is mainly through the short circuit of rotor side converter to realize LVRT, and needs to be matched with the active and reactive power control strategy. SGSC is a novel converter structure, which mainly through compensating stator flux drop to realize LVRT. Finally this two kinds of control strategies were compared, demonstrated SGSC control strategy can achieve the low voltage ride through capabilities of the doubly-fed wind turbine.
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Justo, Jackson J., and Francis A. Mwasilu. "Low Voltage Ride through Enhancement for Wind Turbines Equipped With DFIG under Symmetrical Grid Faults." Tanzania Journal of Engineering and Technology 37, no. 2 (2018): 125–36. http://dx.doi.org/10.52339/tjet.v37i2.488.

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In modern power systems with significant penetration of wind-turbines (WTs), improvement of low voltage ride through (LVRT) capability of WTs equipped with doubly-fed induction generators (DFIGs) is an important issue. Thus, this paper proposes a low voltage ride through (LVRT) strategy, which comprise of a capacitor connected in series with an inductor both connected in parallel to a resistor. The configuration is then connected to a small series resistor via a pair of antiparallel-Thyristors. The circuit and its switching control scheme of the proposed LVRT circuit are designed to: minimize the transition times, maintain the RSC connection to the rotor-windings, and reduce oscillations of dc-link voltage. In this case, the capacitor is entitled to eliminate ripples generated in the rotor voltage while the inductor reduces the ripple in rotor current. Different fault conditions were studied to validate the performance of the proposed scheme using MATLAB/Simulink platform. Comparative results and analysis are presented with conventional LVRT strategies.
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Alsumiri, Mohammed, and Raed Althomali. "Enhanced Low Voltage Ride Through Capability for Grid Connected Wind Energy Conversion System." International Journal of Robotics and Control Systems 1, no. 3 (2021): 369–77. http://dx.doi.org/10.31763/ijrcs.v1i3.441.

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It is obvious that the current era has received much attention in the fields of science and technology, besides the continuous endeavor to provide environmentally friendly and resource-saving alternatives for conventional energy conversion systems. The rapid development of Wind Energy Conversion Systems (WECS) has made Permanent Magnet Synchronous Generator (PMSG) a primer choice because of its advantages. The current trend on WECS necessitates wind turbines to maintain continuous operation during voltage drops, which is referred to as Low Voltage Ride Through (LVRT). The PMSG control technique is a widely used approach for improving conversion efficiency as well as LVRT capability. This paper provides LVRT and power enhancement for grid-connected PMSG based WECS using control techniques. The LVRT capability has been investigated by using PI and Residue controllers. The simulation results show improved active power delivery and better LVRT capability during voltage dips when the Residue controller is implemented.
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Qin, Boyu, Hengyi Li, Xingyue Zhou, Jing Li, and Wansong Liu. "Low-Voltage Ride-Through Techniques in DFIG-Based Wind Turbines: A Review." Applied Sciences 10, no. 6 (2020): 2154. http://dx.doi.org/10.3390/app10062154.

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In recent years, considerable advances were made in wind power generation. The growing penetration of wind power makes it necessary for wind turbines to maintain continuous operation during voltage dips, which is stated as the low-voltage ride-through (LVRT) capability. Doubly fed induction generator (DFIG)-based wind turbines (DFIG-WTs), which are widely used in wind power generation, are sensitive to disturbances from the power grid. Therefore, several kinds of protection circuits and control methods are applied to DFIG-WTs for LVRT capability enhancement. This paper gives a comprehensive review and evaluation of the proposed LVRT solutions used in DFIG-WTs, including external retrofit methods and internal control techniques. In addition, future trends of LVRT solutions are also discussed in this paper.
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Yoon, Kwang-Hoon, Joong-Woo Shin, Jae-Chul Kim, Hyeong-Jin Lee, and Jin-Seok Kim. "Simulation of a Low-Voltage Direct Current System Using T-SFCL to Enhance Low Voltage Ride through Capability." Energies 15, no. 6 (2022): 2111. http://dx.doi.org/10.3390/en15062111.

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Owing to the increasing penetration level of distributed energy resources (DER) and direct current (DC) load, the usage of low-voltage direct current (LVDC) systems has expanded to achieve efficient operations. However, because the LVDC system reaches the peak fault current at a faster rate than the alternating current (AC) system, a solution that protects the system components is necessary to maintain system integrity. It is required by the low-voltage ride-through (LVRT) that the DERs maintain their interconnections with the LVDC system and support fault recovery. In this study, a method is proposed to allow the application of the superconducting fault current limiter (SFCL) to reduce the fault current and enhance the LVRT capability. However, when the DER maintain a connection to support fault recovery, the conventional resistive-type SFCL must withstand the burden of high-temperature superconducting (HTSC) operation during fault state dependence on LVRT. Therefore, this study proposes a trigger-type SFCL to reduce the burden of the HTSC element and enhance the LVRT capability. The voltage sag related to the LVRT was improved owing to the SFCL. The proposed solution was confirmed using PSCAD/EMTDC, which is a commercial software.
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Zheng, Fei, Ming Chang Ding, and Jun Jun Zhang. "A Novel Voltage Sag Generator for Grid-Connected PV System's Low Voltage Ride-Through Test." Advanced Materials Research 805-806 (September 2013): 70–73. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.70.

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A novel voltage sag generator (VSG) is proposed for grid-connected photovoltaic (PV) systems low voltage ride-through (LVRT) test. The topology and parameters of the current-limiting reactor group, grounding reactor group and bi-directional thyristor valve of the VSG is designed to generator voltage sags with several sag depths and phase angles. Furthermore, for a 250kW grid-connected PV inverter modeled by real-time digital simulator (RTDS), LVRT simulations in different sag depths at different phase angles are done with the VSG. Simulation results show that the proposed VSG has reasonable design and can reveal adequately how the voltage sag depths and phase angles influent the LVRT results.
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Hemanth, T., G. V. Nagesh Kumar, and Vempalle Rafi. "An Enhanced Control Procedure for that DVR to accomplish both LVRT and HVRT in the DFIG Wind Turbine." Journal of Physics: Conference Series 2325, no. 1 (2022): 012026. http://dx.doi.org/10.1088/1742-6596/2325/1/012026.

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Abstract In general, Double Fed Induction Generator DFIG-driven wind turbines are extremely sensitive to fluctuations in the grid voltage. For enhancing DFIG wind turbines, this paper proposes an improved procedure for controlling Dynamic Voltage Restorer (DVR) to simultaneously perform both Low Voltage Ride Through (LVRT) and High Voltage Ride Through (HVRT) operations. Consequently, both LVRT and HVRT capabilities are used to increase DFIG performance during grid disturbances. In this study, the Dynamic Voltage Restorer (DVR) has been presented to enhance the capabilities of LVRT and HVRT. MATLAB simulations show that a proposed strategy works as expected.
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Xie, Dong Yan, Yu Ping Wang, and Li Wang. "Improved DC-Link Voltage Control for Double-Fed Induction Generator during Grid Fault." Advanced Materials Research 614-615 (December 2012): 1689–92. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1689.

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Transient capability improvement of doubly fed induction generator (DFIG) during low voltage ride-through (LVRT) is important for both generator and grid safety. A theoretical current control method is introduced here to deal with LVRT of wind turbines with DFIG under symmetrical voltage dips. The objective is achieved by balancing the energy that flows in and out the DC-link capacitor. Simulations performed by Matlab software demonstrate the capabilities of the proposed method in enhancing the DFIG’s performance during low voltage ride-through.
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Dissertations / Theses on the topic "Low voltage ride through (LVRT)"

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Ekechukwu, Chinedum. "Improving Low Voltage Ride-Through Requirements (LVRT) Based on Hybrid PMU, Conventional Measurements in Wind Power Systems." Thesis, Karlstads universitet, Avdelningen för fysik och elektroteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-31449.

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Previously, conventional state estimation techniques have been used for state estimation in power systems. These conventional methods are based on steady state models. As a result of this, power system dynamics during disturbances or transient conditions are not adequately captured. This makes it challenging for operators in control centers to perform visual tracking of the system, proper fault diagnosis and even take adequate preemtive control measures to ensure system stability during voltage dips. Another challenge is that power systems are nonlinear in nature. There are multiple power components in operation at any given time making the system highly dynamic in nature. Consequently, the need to study and implement better dynamic estimation tools that capture system dynamics during disturbances and transient conditions is necessary. For this thesis work, we present the Unscented Kalman Filter (UKF) which integrates Unscented Transformation (UT) to Kalman Filtering. Our algorithm takes as input the output of a synchronous machine modeled in MATLAB/Simulink as well as data from a PMU device assumed to be installed at the terminal bus of the synchronous machine, and estimate the dynamic states of the system using a Kalman Filter. We have presented a detailed and analytical study of our proposed algorithm in estimating two dynamic states of the synchronous machine, rotor angle and rotor speed. Our study and result shows that our proposed methodology has better efficiency when compared to the results of the Extended Kalman Filter (EKF) algorithm in estimating dynamic states of a power system.  Our results are presented and analyzed on the basis of how accurately the algorithm estimates the system states following various simulated transient and small-signal disturbances.
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Costa, Christielly Fernandes da. "Estudo da capacidade LVRT de sistemas eólicos com DFIG durante a ocorrência de faltas elétricas /." Bauru, 2020. http://hdl.handle.net/11449/192810.

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Orientador: André Luiz Andreoli<br>Resumo: Nos últimos anos, questões relacionadas ao meio ambiente, principalmente, ao uso de combustíveis fósseis e à emissão de gases poluentes na atmosfera, ganharam grande destaque internacional. Com os avanços da comunidade científica e o aumento no preço do petróleo no começo da década de 1970, o uso de fontes renováveis, não poluentes e limpas teve grande investimento por parte de diversos países. Nesse contexto, a geração eólica vem se destacando como uma das mais promissoras, especialmente devido a sua viabilidade econômica e ao seu rápido desenvolvimento tecnológico. Entre as diferentes topologias utilizadas nos sistemas de geração eólica, destaca-se a configuração elaborada para operação em velocidade variável, que emprega o gerador de indução duplamente alimentado (DFIG), associado ao conversor eletrônico back-to-back para controle de sua operação. Como principais vantagens da utilização do DFIG, destacam-se sua maior eficiência na conversão de energia, menor estresse mecânico do rotor, controle independente de potência ativa e reativa limitada a valores típicos de 30% da potência nominal. Por outro, sabe-se que, durante a ocorrência de um distúrbio, as correntes do rotor podem atingir altas magnitudes e causar danos ao conversor. Além disso, sobretensões no capacitor do elo CC ocorrem devido à perda de capacidade de transferência de energia do conversor do lado da rede. Entretanto, os aerogeradores podem ser requisitados a permanecerem em funcionamento mesmo durante uma fa... (Resumo completo, clicar acesso eletrônico abaixo)<br>Abstract: In the last years, issues related to the environment, especially the use of fossil fuels and the emission of polluting gases into the atmosphere, have gained great international prominence. With the advances of scientific community and the increase of the oil price in the beginning of the 1970s, the use of renewable, non-polluting and clean sources had a great investment by several countries. In this context, wind generation has stood out as one of the most promising, especially due to its economic viability and its fast technological development. Among the different topologies used in wind generation systems, the configuration developed for operation at variable speed is highlighted, which employs the doubly-fed induction generator (DFIG) associated with back-to-back electronic converter to control its operation. The main advantages of using DFIG include its greater efficiency in energy conversion, less mechanical rotor stress, independent control of active and reactive power limited to typical values of 30% of the rated power. On the other hand, it is known that, during the occurrence of a disturbance, such as an electrical fault, the rotor currents can reach high magnitudes in order to damage the rotor side converter. In addition, overvoltages in the DC link capacitor occur due to the loss of power transfer capacity on grid side converter. However, wind turbines may be required to main in operation even during a fault, in addition to contributing the restoration of voltage... (Complete abstract click electronic access below)<br>Mestre
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Ibrahim, Rania Assem Elsayed. "Low voltage ride-through of permanent magnet synchronous generator wind energy systems." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24907.

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Low Voltage Ride-Through (LVRT) capability is considered a critical feature that should be implemented within a Wind Energy Conversion System (WECS). The mismatch produced between the generated active power and the power delivered to the grid during any dip incidence at the Point of Common Coupling causes a dc link voltage rise, and increase in grid currents and generator speed-up. Failure to ride-through grid voltage dips would lead to converter failures within the WECS. This thesis focuses on enhancing LVRT capability of PMSG based WECS using magnetic amplifiers. LVRT techniques vary according to the turbine and utility grid variables. A survey of the state-of-art LVRT techniques highlighting the merits and demerits of each approach is carried out. A 1.5 MW wind turbine system is modelled, which includes the wind turbine, PMSG, and power converters. Also PMSG control, maximum power point extraction, and grid active and reactive power control are investigated. System performance is studied in compliance with British grid codes for active and reactive power sudden changes, frequency excursion, and grid voltage phase angle jump. The model is tested for LVRT capability under symmetrical network dips. Magnetic amplifiers have been used in various applications such as instrumentation, fault current limiting, and battery chargers. In this thesis, magnetic amplifiers are proposed as part of a LVRT capability enhancing technique. Two possible configurations are proposed; 3-phase and dc-side configurations. LVRT capability enhancement is investigated for the 1.5MW WECS using the two magnetic amplifier configurations. The 3-phase topology is able to reduce the dc link voltage rise; however, it causes an increase in the stored rotor inertia accompanied by an increase in generator speed. The dc-side magnetic amplifier topology is able to limit the dc-link voltage rise which in turn protects the power converters without affecting generator performance. In addition to simulations, a scaled prototype with the dc side magnetic amplifier configuration is used to verify the effectiveness and applicability of the proposed technique during steady state and transient behaviour under various operating conditions.
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Chen, Cheng. "The Impact of Voltage Dip Characteristics on Low Voltage Ride Through of DFIG-based Wind Turbines." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254388.

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In last decade, there is a large increase in installed capacity of wind power. Asmore wind power is integrated into utility networks, related technologychallenges draw much attention. The doubly fed induction generator (DFIG) isthe mainstream choice for wind turbine generator (WTG) in current market andthe object of this thesis. It is very sensitive to voltage dips. The enhancement oflow voltage ride through (LVRT) is one of the most important issues for DFIG,and many works have already been done to provide solutions.In current works, the voltage dip waveforms that are applied in LVRTrelated works are largely different from waveforms in reality, because they failto consider the the effect of realistic wind farm configurations on waveforms ofvoltage dips and significant influences of additional characteristics of voltagedips. The true impact of the voltage dip needs to be assessed in performanceevaluation and development of LVRT methods. To support the development ofpractical LVRT capacity enhancement solutions, the application of voltage dipknowledge is definitely demanded.In this thesis, the characteristics of realistic waveform voltage dips in windfarm are analyized based on voltage dip knowldege from power quality field,measured voltage dip from industry and realistic wind farm configurations.Classical analysis theory is applied to explain the principles of the impact ofvoltage dip characteristics on dynamic behavior of DFIG. The impacts of manywidely neglected characteristics such as phase angle jump (PAJ), point on wave(POW) of initiation and recovery, voltage recovery process, transformerconfigurations, load effect are revealed and verified by simulations. The impactof many voltage dip characteristics on DFIG are studied for the first time.<br>De senaste tio åren har sett en stor ökning av installerad effekt av vindkraft.Mer vindkraft i elnäten har lett till större uppmärksamhet om dess tekniskautmaningar. Den dubbelmatad asynkrongenerator (DFIG) är idag denvanligaste förekommande typen i vindkraftverk. Den är mycket känslig förspänningssänkningar. Förbättring av tålighet för spänningssänkningar (LVRT)är en av de viktigaste frågorna för DFIG, och många studier har redan söktlösningar.I befintliga studier om LVRT har spänningssänkningarna skiljt sig väsentligtfrån verkliga vågformer, då de inte har tagit hänsyn till realistiskavindparkkonfigurationer och betydande påverkan av ytterligare egenskaper hosspänningssänkningar. För att stödja utvecklingen av praktiska LVRT lösningarbehövs mer kunskap om spänningssänkningar för att bedöma dess verkligainverkan.Detta examensarbete förbättrar LVRT analysen av DFIG genom att tillämpakunskap om spänningssänkningar från elkvalitetsområdet, tillsammans medrealistiska vindparkskonfigurationer. Inflytandet av ändringar i fasvinkel(PAJ), fasvinkeln vid sänkning och återhämtning (POW), spänningsåterhämtning, transformatorkonfigurationer, last och många andra egenskaperav spänningssänkningar ingår också. Inflytandet av många egenskaper avspänningssänkningar studeras här akademiskt för första gången. Denkaraktäristik av realistiska spänningssänkningar som inträffar vid generatornspoler, och de effekter dessa har, studeras och förklaras genom teoretisk analysoch intensiva simuleringar.
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Forest, Zack. "Investigating low voltage ride through capability on wind farm by using static synchronus compensator (STATCOM) application." Thesis, Forest, Zack (2012) Investigating low voltage ride through capability on wind farm by using static synchronus compensator (STATCOM) application. Other thesis, Murdoch University, 2012. https://researchrepository.murdoch.edu.au/id/eprint/13891/.

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As an alternative to traditional fossil fuel extracted energy, wind energy has been acknowledged as one of the most important sources of renewable energies in the world. This clean and natural source of energy could be a key to solving the worldwide energy crisis with low environmental impact. The increased penetration of wind power into the power grids mean the impact of the wind turbines on the grid can no longer be ignored. Grid codes these days include the requirement that the wind turbines have to stay connected when the voltage drops. This is known as the Low Voltage Ride Through (LVRT) requirement. Tripping wind turbines during any fault event can have a major effect on the stability of the power system. A voltage regulation device is needed for stability improvement and power quality improvement of the overall system. The voltage stability issue can be achieved by using Flexible AC Transmission System (FACTS) devices with the reactive power compensation required by the power grid. FACTS devices are widely used for enhancing power system performance, reducing overall power losses, increasing grid reliability and voltage stability. This thesis investigates the use of Static Synchronous Compensator (STATCOM) on wind farms for the purpose of stabilizing the grid voltage after a disturbance. The study focuses on a fundamental grid operation requirement to maintain a voltage at the point of common coupling by regulating the voltage. The simulations were carried out by using DIgSILENT PowerFactory software and attaching STATCOM model in the wind farm model. The results indicate that the STATCOM can provide an enhanced performance to the power grid. This is mainly achieved by generating or absorbing the reactive power to provide grid stability during the fault period. Result comparison was made with the previous results which were carried out by another student in 2010.
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Morneau, Jean. "A comparative evaluation of low voltage ride through solutions in wind turbines using doubly fed induction generators." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19286.

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With the increased presence of wind energy in the electric power system, many utilities now have grid code requirements specific to wind turbines. Low voltage ride through (LVRT) is one such requirement, where turbines have to stay connected to the grid for typical faults on the transmission systems. Solutions have been proposed for wind turbines equipped with doubly fed induction generators (DFIG). This thesis is a contribution to a comparative assessment of the respective performance of three LVRT solutions. This assessment is made in reference to representative existing grid codes. The DFIGs are placed in an electric power system benchmark which is subjected to a series of faults of various types, durations, and severities. The wind farm input wind speed is also varied to change the DFIGs operating conditions. The performance of each method is evaluated based on the DFIG response, such as rotor speed, rotor current, and dc bus voltage, and on the wind farm response, such as power generation, terminal voltage and output current. Recommendations on how the turbine using a given method should be modified to ensure that the LVRT requirement is met are made based on observations from simulations.<br>Avec l'augmentation de la présence de l'énergie éolienne dans les réseaux électriques, plusieurs compagnies d'électricité ont défini des normes de raccordement specifiques aux éoliennes. L'une d'elles oblige les éoliennes à demeurer en service pour un certain temps, avant que leur déclenchement ne soit permis, lors d'une période de sous-tension, 'low voltage ride through' (LVRT). Différentes solutions ont été proposées pour des éoliennes utilisant des machines asynchrones à double alimentation (DFIG). Cependant, ces méthodes sont rarement comparées entre elles. Cette thèse fait une évaluation comparative de trois solutions pour satisfaire aux exigences du LVRT pour des éoliennes utilisant des DFIGs. Les éoliennes sont installées dans un réseau électrique type qui est soumis à une série de défauts de différents types, durées et sévérités. La vitesse du vent est également variée pour changer le régime des DFIGs. La performance de chacune des méthodes est évaluée en fonction de l'action du DFIG, incluant la vitesse du rotor, le courant dans le rotor, et la tension du bus dc; et la réponse de la ferme, incluant la production d'énergie électrique, la tension et le courant de sorti. Des recommandations sur des modifications à apporter aux éoliennes utilisant une méthode donnée afin de satisfaire aux exigences du LVRT sont faites sur la base des résultats des simulations. fr
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Hoffmann, Ulwin. "Direct grid connection and low voltage ride-through for a slip synchronous-permanent magnet wind turbine generator." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19980.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: The slip synchronous-permanent magnet generator (SS-PMG) is a direct-driven, direct-to-grid generator for wind turbine applications. This investigation focuses on achieving automated grid connection and low voltage ride-through for a small-scale SS-PMG. To reduce cost and complexity, components such as blade pitch controllers and frequency converters are avoided. Instead, electromagnetic braking is employed to control turbine speed prior to grid synchronisation and compensation resistances are used to facilitate grid fault ride-through. The conditions under which the SS-PMG can be successfully synchronised with the grid are determined, indicating a need for speed control. An evaluation of electromagnetic braking strategies reveals that satisfactory speed control performance can be achieved when employing back-to-back thyristors to switch in the braking load. Simulations show that controlled synchronisation can be executed successfully under turbulent wind conditions. All controllable parameters are held within safe limits, but the SS-PMG terminal voltage drop is higher than desired. Compensation is developed to allow the SS-PMG to ride through the voltage dip profile specified by the Irish distribution code. It is found that a combination of series and shunt resistances is necessary to shield the SS-PMG from the voltage dip, while balancing active power transfer. The flexibility offered by thyristor switching of the shunt braking load is instrumental in coping with turbulent wind conditions and unbalanced dips. The South African voltage dip profile is also managed with conditional success. Following on from the theoretical design, the grid connection controller is implemented for practical testing purposes. Protection functions are developed to ensure safe operation under various contingencies. Before testing, problems with the operation of the thyristors are overcome. Practical testing shows that grid synchronisation can be undertaken safely by obeying the theoretically determined conditions. The speed control mechanism is also shown to achieve acceptable dynamic performance. Finally, the SS-PMG is incorporated into a functioning wind turbine system and automated grid connection is demonstrated under turbulent wind conditions. Future investigations may be focused on optimal control strategies, alternative solid-state switching schemes, and reactive power control. Low voltage ride-through should also be optimised for the South African dip profile and validated experimentally.<br>AFRIKAANSE OPSOMMING: Die glip-sinchroon permanente magneet generator (GS-PMG) is ‘n direkte dryf, direkte netwerkgekoppelde generator vir windturbine toepassings. Hierdie ondersoek fokus op die bereiking van ’n ge-outomatiseerde netwerkkoppeling en lae spanning deurry vir ‘n kleinskaalse GS-PMG. Om kostes en kompleksiteit te verminder, word komponente soos lemsteekbeheerders en frekwensie-omsetters vermy. In plaas daarvan word elektromagnetiese remwerking gebruik om die turbine spoed, voorgaande net-werksinchronisasie, te beheer, en word kompensasieweerstande gebruik om netwerkfoutdeurry te handhaaf. Die omstandighede waaronder die GS-PMG suksesvol met die netwerk gesinchroniseer kan word, is vasgestel en dit het die behoefte aan spoedbeheer uitgewys. ‘n Evaluering van elektromagnetiese remstrategië wys uit dat ’n bevredigende spoedbeheervermoë verkry kan word as anti-parallelle tiristors gebruik word om die remlas te skakel. Simulasies wys dat beheerde netwerksinchronisasie suksesvol uitgevoer kan word, selfs onder turbulente windtoestande. Alle beheerbare parameters is binne veilige perke gehou, maar die GS-PMG se klemspanningsval is gevind as hoë as verwag. Kompensasie is ontwikkel om die GS-PMG toe te laat om deur die spanningsvalprofiel, soos gespesifieer deur die Ierse distribusiekode, te ry. Dit is gevind dat ‘n kombinasie van serie- en parallelle weerstande nodig is om die GS-PMG teen die spanningsval te beskerm, terwyl aktiewe drywingsoordrag gebalanseer word. Die buigbaarheid wat verkry word met die tiristorskakeling van die parallele weerstand is noodsaaklik in die hanteering van turbulente windtoestande en ongebalanseerde spanningsvalle. Die Suid-Afrikaanse spanningsvalprofiel is ook met voorwaardelike sukses hanteer. In opvolg van die teoretiese ontwerp is die netwerkkoppelingsbeheerder vir praktiese toetsdoeleindes in werking gestel. Beskermingsfunksies is ontwikkel om veilige werking onder verskeie gebeurlikhede te verseker. Die probleme met die werking van die tiristors is oorkom voor die aanvang van die toetse. Die praktiese toetse bewys dat netwerksinchronisasie veilig gedoen kan word deur die teoretiese bepaalde voorwaardes te volg. Dit is ook getoon dat met die spoedbeheermeganisme aanvaarbare dinamiese gedrag verkry kan word. Ten laaste is die GS-PMG in ‘n werkende windturbinestelsel geïnkorporeer en outomatiese netwerkkoppeling is onder turbulente windtoestande gedemonstreer. Toekomstige ondersoeke kan toegespits word op optimale beheerstrategië, alternatiewe vaste toestand skakelingskemas en reaktiewe drywingsbeheer. Lae spanning deurry moet nog vir die Suid- Afrikaanse spanningsprofiel ge-optimeer en eksperimenteel bevestig word.
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Appadoo, Kulisha W. "Comparison of low voltage ride through capabilities of synchronous generator with STATCOM and DFIG based wind farms." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/13562.

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Includes bibliography.<br>Increase in wind generation and grid-integration of wind energy technologies has resulted from an increasing demand of cheap and clean electricity across the globe. Wind generators are available as small, medium and large scale electric generators, usually in the range of 1kW to 100MW and are usually installed in areas rich in wind resource which may or may not be located close to the load centres. Wind energy penetration has increased since the 1970s with the total worldwide capacity of installed wind power reaching about 282,275 MW. Apart from technical issues of grid-integration, research is also being done to investigate the participation of wind energy systems to enhance grid performance through fault ride-through capabilities, providing voltage control and power quality improvement etc. The goal of a Fault Ride Through (FRT) or Low Voltage Ride Through (LVRT) system is to enable a wind farm (WF) to withstand a severe voltage dip at the connection point and still stay connected to the power system as long as the fault persists. Wind turbine designs are required to incorporate LVRT capability as per Grid Code’s requirements only if they are technically needed for a reliable and secure power system operation. The basic requirement for LVRT is that the wind turbines must maximise their reactive power injections to the network without exceeding the turbine limits. The maximisation of reactive current must continue for at least 150msafter the fault clearance or until the grid voltage is recovered within the normal operation range. It is important here to discuss here the immediate impact of the voltage dip on the wind farm (WF) operation. During the voltage dip caused by the fault, the active power provided to the grid by the WF is instantaneously reduced. This power becomes at least temporarily lower than the mechanical power available at the rotor hence the rotor speed of the wind generator increases. It is required for the LVRT capability of the WF, that the wind generators of the WF must not disconnect from the grid during fault persistence, either due to over-speeding or under voltage protections. After the clearing of the fault that led to the voltage dip, the voltage at the wind turbine bus would increase. It is also required that the wind generators should resume their power supply to the network without losing stability.
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Notholt, Vergara José Antonio. "Fault ride through capabilities of inverter based distributed generation connected to low and medium voltage distribution networks." München Verl. Dr. Hut, 2008. http://d-nb.info/992644887/04.

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Fønstelien, Olav Jakob. "A Solution for Low Voltage Ride Through of Induction Generators in Wind Farms using Magnetic Energy Recovery Switch." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9822.

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<p>Induction generators constitute 30 percent of today’s installed wind power. They are very sensitive to grid voltage disturbances and need retrofitting to enhance their low voltage ride through (LVRT) capability. LVRT of induction generators by shunt-connected FACTS controllers such as STATCOMs have been proposed in earlier studies. However, as this report concludes, in this application their VA-rating requirement is considerably higher than that of series-connected FACTS controllers. One such series FACTS controller is the magnetic energy recovery switch (MERS). It consists of four power electronic switches and a capacitor in a configuration identical to the single-phase full bridge converter. Its arrangement in an electric circuit, however, is different, with only two of the converter’s terminals utilised and connected in series. It has the characteristic of a variable capacitor and is related to FACTS controllers with series capacitors such as the GCSC and the TCSC. Successful operation of MERS for LVRT of induction generators has been demonstrated by simulations and verified by small-scale experiments. Index terms – Low voltage ride through (LVRT), magnetic energy recovery switch (MERS), series-connected FACTS controller, wind power, grid code, induction generator.</p>
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Books on the topic "Low voltage ride through (LVRT)"

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Feng li fa dian xi tong di dian ya yun xing ji shu: Wind power system low voltage ride through technology. Ji xie gong ye chu ban she, 2009.

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Book chapters on the topic "Low voltage ride through (LVRT)"

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Ramesh Babu, V., and A. Ganapathi. "Low Voltage Ride Through (LVRT) Capability Enhancement of Axial Flux Induction Generator-Based Wind Energy Conversion System." In Lecture Notes in Electrical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2256-7_39.

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Mehrdad, Tarafdar Hagh, and Kashem Mohammad Muttaqi. "Low Voltage Ride Through of Wind Energy Systems." In Sustainable Power Systems. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2230-2_3.

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Li, Shengqing, Xin Yao, and Jingyu Liu. "Fuzzy-ADRC Strategy to DFIG Low-Voltage Ride Through." In Wireless Technology, Intelligent Network Technologies, Smart Services and Applications. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5168-7_10.

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Khan, Mohammed Ali, V. S. Bharath Kurukuru, and Ahteshamul Haque. "Islanding classification and low-voltage ride through for grid connected transformerless inverter." In Intelligent Circuits and Systems. CRC Press, 2021. http://dx.doi.org/10.1201/9781003129103-4.

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Li, Ruming, Tianyu Liu, Qinghua Zhu, and Li Zhang. "Pitch Angle Control for Improving the Low Voltage Ride-Through Based on DFIG." In Communications in Computer and Information Science. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45261-5_39.

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Said, H. A., and J. V. Ringwood. "Low voltage ride-through capability enhancement of a grid-connected wave energy conversion system." In Trends in Renewable Energies Offshore. CRC Press, 2022. http://dx.doi.org/10.1201/9781003360773-31.

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Maheswari, M., S. K. Indumathi, and A. K. Parvathy. "Soft Computing Techniques-Based Low Voltage Ride Through Control of Doubly Fed Induction Wind Generator." In Intelligent Paradigms for Smart Grid and Renewable Energy Systems. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9968-2_10.

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Hui, Zhao, and Ma Lingling. "Low Voltage Ride-Through Analysis of Doubly Fed Induction Generator Wind Turbines under Grid Fault." In Recent Advances in Computer Science and Information Engineering. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25778-0_42.

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Kuzhali, M., S. Joyal Isac, and S. Poongothai. "Improvement of Low Voltage Ride Through Capability of Grid-Connected DFIG WTs Using Fuzzy Logic Controller." In Advances in Intelligent Systems and Computing. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2182-5_33.

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Ma, Ke. "Thermal Loading of Several Multilevel Converter Topologies for 10 MW Wind Turbines Under Low Voltage Ride Through." In Research Topics in Wind Energy. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21248-7_12.

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Conference papers on the topic "Low voltage ride through (LVRT)"

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Lianbing, Li, and Zhang Peng. "Low voltage ride through(LVRT) research of DFIG." In 2013 25th Chinese Control and Decision Conference (CCDC). IEEE, 2013. http://dx.doi.org/10.1109/ccdc.2013.6561397.

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Qureshi, W. A., and N. C. Nair. "Systematic development of Low Voltage Ride-Through (LVRT) envelope for grids." In 2010 IEEE Region 10 Conference (TENCON 2010). IEEE, 2010. http://dx.doi.org/10.1109/tencon.2010.5686749.

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Noorcheshma, P., J. Sreedevi, and V. Sivaprasad. "Low Voltage Ride through (LVRT) of DFIG and PMSM wind turbine." In 2015 IEEE International Conference on Electrical, Computer and Communication Technologies (ICECCT). IEEE, 2015. http://dx.doi.org/10.1109/icecct.2015.7225999.

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Yousef, Ali, Adel Nasiri, and Omar Abdelbaqi. "Wind turbine level energy storage for low voltage ride through (LVRT) support." In 2014 IEEE Symposium on Power Electronics and Machines for Wind and Water Applications (PEMWA). IEEE, 2014. http://dx.doi.org/10.1109/pemwa.2014.6912233.

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Zhou, Xue-Song, Zhen-Wei Qin, and You-Jie Ma. "An Overview of the Low Voltage Ride Through (LVRT) of Doubly-Fed Induction Generator." In International Conference on New Energy and Sustainable Development (NESD 2016). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813142589_0020.

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Shukla, Rishabh Dev, and Ramesh Kumar Tripathi. "Low voltage ride through (LVRT) ability of DFIG based wind energy conversion system-I." In 2012 Students Conference on Engineering and Systems (SCES). IEEE, 2012. http://dx.doi.org/10.1109/sces.2012.6199113.

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Shukla, Rishabh Dev, and Ramesh Kumar Tripathi. "Low voltage ride through (LVRT) ability of DFIG based wind energy conversion system II." In 2012 Students Conference on Engineering and Systems (SCES). IEEE, 2012. http://dx.doi.org/10.1109/sces.2012.6199114.

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Wang, Chen, Chetan Mishra, and Virgilio A. Centeno. "Low Voltage Ride Through (LVRT) Constrained Transient Stability Assessment Using Lyapunov Functions Family Method." In 2020 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2020. http://dx.doi.org/10.1109/pesgm41954.2020.9281525.

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Han, Yang. "Reactive power capabilities of DFIG-based wind park for low-voltage ride-through (LVRT) performance." In 2013 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE). IEEE, 2013. http://dx.doi.org/10.1109/qr2mse.2013.6625971.

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Kumar, Amritesh, Aditya Narula, and Vishal Verma. "Low Voltage Ride Through (LVRT) Strategies for Single Phase Grid Connected PV Fed Cascaded Multilevel Inverter." In 2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES). IEEE, 2020. http://dx.doi.org/10.1109/pedes49360.2020.9379534.

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