检索结果-南通市图书馆

energy-based Control with L2 Disturbance Attenuation for Machine-Side Doubly-Fed wind Generator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy-based Control with L2 Disturbance Attenuation for Mac...

A direct power control of a DFIG based-WECS during symmetrical voltage dips

第三十届中国控制会议

作者： SONG Huihui,QU Yanbin Harbin Institute of Technology at Weihai,Weihai 264209,P.R.China

Torque disturbances caused by the aerodynamic loads are the main influence factors on performance of the machine- side control in the wind energy conversion system(WECS).Based on port-controlled Hamiltonian(PCH) modeling theory, the machine-side subsystem of the WECS with the disturbances from the wind turbine was described by a novel PCH model with bounded unknown disturbances in this paper.Moreover,a new energy-based control with L disturbance attenuation was proposed to attain the machine-side control objectives upon the designed model.Simulations were performed with a 2MW WECS and the results showed that the proposed control can realize the maximum wind power extraction well and possess good control performance under disturbances.

关键词： wind energy Doubly-fed induction generator energy-based control L2 disturbance attenuation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2020年第1期5卷 36-47页

作者： Sara Mensou Ahmed Essadki Tamou Nasser Badr Bououlid Idrissi Research Center of Engineering and Health Sciences and Technologies from ENSET Mohammed V UniversityRabatMorocco Research Center of Engineering and Health Sciences and Technologies from ENSIAS Mohammed V UniversityRabatMorocco Electromechanical Engineering Department of ENSAM Moulay Ismaïl UniversityMeknèsMorocco.

The wind energy Conversion System(WECS)based Doubly Fed Induction Generator(DFIG)has experienced a rapid development in the world,which leads to an increasing insertion of this source of energy in the electrical grids.The sudden and temporary drop of voltage at the network can affect the operation of the DFIG;the voltage dips produce high peak currents on the stator and rotor circuits,without protection,the rotor side converter(RSC)will suffer also from over-current limit,consequently,the RSC may even be destroyed and the generator be damaged.In this paper a new Direct Power Control(DPC)method was developed,in order to control the stator powers and help the operation of the aero-generator during the faults grid;by injecting the reactive power into the network to contribute to the return of voltage,and set the active power to the optimum value to suppress the high peak currents.The DPC method was designed using the nonlinear Backstepping(BS)controller associated with the Lyapunov function to ensure the stability and robustness of the system.A comparison study was undertaken to verify the robustness and effectiveness of the DPC-BS to that of the classical vector control(VC)using Proportional-Integral(PI)correctors.All were simulated under the Simulink®software.

关键词： wind energy Doubly-fed induction aero-generator Voltage dips DPC strategy Backstepping technique Lyapunov function

Super twisting sliding mode approach applied to voltage orientated control of a stand-alone induction generator

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2021年第1期6卷 233-241页

作者： Yacine Bendjeddou Abdelhakim Deboucha Larafi Bentouhami Elkheir Merabet Rachid Abdessemed Laboratory of electrical and materials engineering(LGEM) Higher School of Electrical and Energetic Engineering of Oran31000Bir El DjirAlgeria Ecole Supérieure des Sciences Appliquées d’Alger Electrical Engineering Department16000AlgiersAlgeria Department of electromechanical University of Bordj Bou Arréridj34000El AnceurAlgeria Laboratory LEB Department of Electrical EngineeringUniversity of Batna-205000FesdisAlgeria

To enhance the robustness and dynamic performance of a self-excited induction generator (SEIG) used in a stand-alone wind energy system (WES), a virtual flux oriented control (VFOC) based on nonlinear super-twisting sliding mode control (STSMC) is adopted. STSMC is used to replace the conventional proportional-integral-Fuzzy Logic Controller (PI-FLC) of the inner current control loops. The combination of the proposed control strategy with space vector modulation (SVM) applied to a PWM rectifier brings many advantages such as reduction in harmonics, and precise and rapid tracking of the references. The performance of the proposed control technique (STSMC-VFOC-SVM) is verified through simulations and compared with the traditional technique (PI-FLC-VFOC-SVM). It shows that the proposed method improves the dynamics of the system with reduced current harmonics. In addition, the use of a virtual flux estimator instead of a phase-locked loop (PLL) eliminates the line voltage sensors and thus increases the reliability of the system.

关键词： Self-excited induction generator Virtual flux oriented control Back-to-back converter Super twisting sliding mode control PI-fuzzy controller wind energy

Conventional generation emulation for power grids with a high penetration of wind power

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clean energy 2021年第1期5卷 93-103页

作者： Rasha El-Azab Eslam M.Wazeer Mohamed Daowd A.M.Abdel Ghany Electrical Power and Machines Department Faculty of EngineeringHelwan UniversityCairoEgypt

Integrating large-scale wind plants with the electricity grids has many challenges for grid operators.Besides the variability and uncertainty of wind power,coordinating between different technologies of generation in the same grid can be considered the main problem,specifically for short-term frequency stability.Therefore,a large penetration of wind power generation in modern power grids has a risky influence on the power-system frequency.wind-generation plants have contradictory behaviour compared to classic thermal plants,especially in active generated power-shortage events due to the variable nature of wind power.Existing experience in wind plants keeps part of the available wind power unloaded,using what are known as deloading techniques.Different deloading techniques are usually applied to emulate the thermal-plant-governor function and confirm a proper spinning reserve for any active-power shortages.These techniques decrease the generated power from wind plants continuously from maximum point tracking ones.Consequently,the practical capacity,annual generated energy and economical income of wind plants are reduced.In addition,grid-protection and control sub-schemes are set and designed according to the well-known conventional responses of thermal plants,which increase the need for thermal-plant-behaviour emulation.In this paper,instead of the usual deloading methods,a supercapacitors scheme is proposed with wind turbines to emulate the response of conventional power plants.The study discusses the technical and economic benefits of the proposed addition of supercapacitors in the wind-plant-planning phase.Restricted frequency grid-code indices are selected to evaluate studied behaviours.Simulation results of the IEEE four-generation two-area system determines the effectiveness of suggested schemes technically.The System Advisor Model(SAM)program estimates the economic benefits of a typical US study case compared with the existing wind-deloading technique.

关键词： wind energy planning analysis energy storage supercapacitor frequency stability

Numerical experimental study on the potential climatic impacts oflarge-scale wind farms in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2019年第3期10卷 143-149页

作者： HUANG Jian-Bin LOU Peng-Kang SUN Hong-Wei LUO Yong ZHAO Zong-Ci Ministry o f Education Key Laboratory for Earth System Modeling Department o f Earth System ScienceTsinghua University100084BeijingChina

wind energy has been rapidly developed in China during the past decades and the installed capacity has been the largest in the world. In the future, utilization of wind power is still expected to carry out in China mainly with a large-scale centralized layout. Here, we examine the potential climatic impacts of large-scale windfarms associated with deployment scale in China using numerical experiments, in which four deployment scenarios were designed. These four scenarios represented relatively small- (484 GW), medium- (2165 GW) and large-scale (3490 GW and 5412 GW) installed wind power capacities, respectively. Results showed that turbulent kinetic energy, wind velocity, and air temperature varied consistently within those windfarms with the largest changes in turbine hub heights. Moreover, the above relatively large- scale windfarms could induce regional wanning with a maximum of above 0.8 °C in North China. This regional warming may be linked to an anomalous circulation pattern with a negative pressure anomaly center in Northeast China and a positive pressure anomaly center in the middle and lower reaches of the Yangtze-Huaihe River Basin.

关键词： Climatic impact Large-scale windfarms wind energy China WRF model

Mapping frequent spatio-temporal wind profile patterns using multi-dimensional sequential pattern mining

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2017年第3期10卷 238-256页

作者： Norhakim Yusof Raul Zurita-Milla Department of Geo-Information Processing Faculty of Geo-Information Science and Earth Observation(ITC)University of TwenteEnschedeThe Netherlands Department of Geoinformation Faculty of Geoinformation and Real EstateUniversiti Teknologi MalaysiaUTMJohor BahruMalaysia

Holistic understanding of wind behaviour over space,time and height is essential for harvesting wind energy application.This study presents a novel approach for mapping frequent wind profile patterns using multidimensional sequential pattern mining(MDSPM).This study is illustrated with a time series of 24 years of European Centre for Medium-Range Weather Forecasts European Reanalysis-Interim gridded(0.125°×0.125°)wind data for the Netherlands every 6 h and at six height levels.The wind data were first transformed into two spatio-temporal sequence databases(for speed and direction,respectively).Then,the Linear time Closed Itemset Miner Sequence algorithm was used to extract the multidimensional sequential patterns,which were then visualized using a 3D wind rose,a circular histogram and a geographical map.These patterns were further analysed to determine their wind shear coefficients and turbulence intensities as well as their spatial overlap with current areas with wind turbines.Our analysis identified four frequent wind profile patterns.One of them highly suitable to harvest wind energy at a height of 128 m and 68.97%of the geographical area covered by this pattern already contains wind turbines.This study shows that the proposed approach is capable of efficiently extracting meaningful patterns from complex spatio-temporal datasets.

关键词： Spatio-temporal data mining multi-dimensional sequential pattern mining wind shear coefficient turbulence intensity wind energy

A comparative life-cycle analysis of tall onshore steel wind-turbine towers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clean energy 2020年第1期4卷 48-57页

作者： N.Stavridou E.Koltsakis C.C.Baniotopoulos Civil Engineering Department School of EngineeringUniversity of BirminghamEdgbastonBirminghamUK Civil Engineering Department School of EngineeringAristotle University of ThessalonikiGreece

Earth has lately been suffering from unforeseen catastrophic phenomena related to the consequences of the greenhouse effect.It is therefore essential not only that sustainability criteria be incorporated into the everyday lifestyle,but also that energy-saving procedures be enhanced.According to the number of wind farms installed annually,wind energy is among the most promising sustainable-energy sources.Taking into account the last statement for energy-saving methods,it is essential to value the contribution of wind energy not only in eliminating CO_(2) emissions when producing electricity from wind,but also in assessing the total environmental impact associated with the entire lifetime of all the processes related with this energy-production chain.In order to quantify such environmental impacts,life-cycle analysis(LCA)is performed.As a matter of fact,there are a very limited number of studies devoted to LCA of onshore wind-energy-converter supporting towers-a fact that constitutes a first-class opportunity to perform high-end research.In the present work,the life-cycle performance of two types of tall onshore wind-turbine towers has been investigated:a lattice tower and a tubular one.For comparison reasons,both tower configurations have been designed to sustain the same loads,although they have been manufactured by different production methods,different amounts of material were used and different mounting procedures have been applied;all the aforementioned items diversify in their overall life-cycle performance as well as their performance in all LCA phases examined separately.The life-cycle performance of the two different wind-turbine-tower systems is calculated with the use of efficient open LCA software and valuable conclusions have been drawn when combining structural and LCA results in terms of comparing alternative configurations of the supporting systems for wind-energy converters.

关键词： energy and environment energy system and policy wind energy

Which variables are essential for renewable energies?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2020年第2期13卷 253-261页

作者： Thierry Ranchin Mélodie Trolliet Lionel Ménard Lucien Wald MINES ParisTech PSL UniversityO.I.E.-Centre ObservationImpactsEnergieSophia Antipolis CedexFrance

Essential Variables are defined as a minimal set of variables that explain the state of the system.They are crucial for predicting its developments,and support metrics that measure its evolution.The variables should be relevant to meet requirements of stakeholders and be technically and economically feasible for systematic observation.A definition of Essential Renewable Energies Variables is proposed linked with their identification in several domains in renewable energy using a bottom-up and userdriven approach,and spanning over several years of documented interaction with stakeholders.Lists of variables are proposed in hydropower,solar,wind,and marine energies.It does not comprise the variables relating to social and economic aspects supporting decision making in investment nor those relating to civil engineering that are needed to erect a plant or farm.

关键词： Renewable energy solar energy wind energy hydropower energy renewable marine energy essential variables GEOSS

Review on Research about Wake Effects of Offshore wind Turbines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

energy Engineering 2022年第4期119卷 1341-1360页

作者： Yehong Dong Guangyin Tang Yan Jia Zekun Wang Xiaomin Rong Chang Cai Qingan Li Yingjian Yang Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang) Zhanjiang524013China CSIS(Chongqing)Haizhuangwind Power Equipment Co. Ltd.Chongqing401122China Offshore Technology Center of CCS Tianjin300457China School of energy and Power Engineering Inner Mongolia University of TechnologyHohhot010051China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China

In recent years,the construction of offshore wind farms is developing rapidly.As the wake effect of the upstream wind turbines seriously affect the performance of the downstream wind turbines,the wake effect of offshore wind turbines has become one of the research hotspots.First,this article reviews the research methods of wake effects,including CFD numerical simulation method,wind turbine wake model based on roughness and engineering wake models.However,there is no general model that can be used directly.Then it puts forward some factors that affect the wake of offshore wind turbines.The turbulence intensity in offshore wind fields is lower than that in onshore wind fields.This makes the wake recovery length of offshore wind turbines longer than that of onshore wind turbines.Floating offshore wind turbines are simultaneously disturbed by wind loads and wave loads.Unsteady movement of the platform caused by wave loads.It affects the development and changes of the wake of wind turbines.In this regard,the focus of research on the wake effects of offshore wind farms will be the proposal of accurate prediction models for the wake effects of sea wind farms.

关键词： wind energy offshore wind turbines wake effects offshore wind farms