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Cascade controller based modeling of a four area thermal:gas AGC system with dependency of wind turbine generator and PEVs under restructured environment

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Protection and Control of Modern Power Systems 2022年第1期7卷 696-713页

作者： Debdeep Saha Lalit Chandra Saikia Asadur Rahman Department of Electrical Engineering Indian Institute of Engineering Science and Technology ShibpurShibpurWest BengalIndia Department of Electrical Engineering National Institute of Technology SilcharSilcharAssamIndia Department of Electrical Engineering National Institute of Technology SrinagarSrinagarIndia

This paper investigates automatic generation control(AGC)of a realistic hybrid four-control area system with a dis-tinct arrangement of thermal units,gas units and additional power generation.A proportional-integral-double deriva-tive cascaded with proportional-integral(PIDD-PI)controller is employed as secondary controller in each control area for robust restructured AGC considering bilateral transactions and contract *** Harris Hawks algorithm is used to determine the optimal controller gains and system parameters under several *** vehicle(EV)aggregators are employed in each area to participate fully along with thermal and gas units to compensate for the unscheduled system demand in the local area.A comparison of non-cascaded controllers such as PI-PD,PD-PID and the proposed PIDD-PI proves the superiority of the *** effect of the decline in inertia is closely examined because of the sudden outage of a generating unit while at the same time considering the change in area frequency response characteristics and area control *** fleets make significant contributions to improving the system dynamics dur-ing system inertia *** use of EVs in the presence of a wind energy-supported grid can provide a stable efficacy to the power *** simulations with higher load demands,stochastic communication delays in presence of the WTG plant,and violations in system loadings and changes in gas turbine time constants in the absence of WTG demonstrate the robustness of the proposed control approach.

关键词： Automatic generation control Cascade controller Electric vehicle Harris Hawks algorithm wind turbine generator

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Practical Realization of Optimal Auxiliary Frequency Control Strategy of wind turbine generator

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Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 617-626页

作者： Ming Sun Yong Min Xuejun Xiong Lei Chen Le Zhao Yuyao Feng Bingran Wang IEEE State Key Laboratory of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Shanghai Electric Power Research Institute Shanghai 200437China School of New Energy Harbin Institute of Technology(Weihai)Weihai 264209China

Adding the auxiliary frequency control function to the wind turbine generator(WTG)is a solution to the frequency security problem of the power system caused by the replacement of the synchronous generator(SG)by the *** auxiliary frequency control using rotor kinetic energy is an economical scheme because the WTG still runs at the maximum power point during normal *** this paper,the functional optimization model of the auxiliary frequency control strategy of WTG is *** optimal auxiliary frequency control strategy is obtained by solving the model *** for the practical realization of the control strategy,the coordination of the auxiliary frequency control with the maximum power point tracking(MPPT)control is *** practical auxiliary frequency control strategy is modified to adapt to different power disturbances in the system,and the parameter setting method is also *** sensitivity of system frequency to control parameters is ***,the simulation results verify the effectiveness and practicability of the proposed control strategy.

关键词： Power system frequency security wind turbine generator auxiliary frequency control rotor kinetic energy energy constraint

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Hierarchical parameter estimation of DFIG and drive train system in a wind turbine generator

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Frontiers of Mechanical Engineering 2017年第3期12卷 367-376页

作者： Xueping PAN Ping JU Feng WU Yuqing JIN College of Energy and Electrical Engineering Hohai UniversityNanjing 211100 China

A new hierarchical parameter estimation method for doubly fed induction generator （DFIG） and drive train system in a wind turbine generator （WTG） is proposed in this paper. Firstly, the parameters of the DFIG and the drive train are estimated locally under different types of disturbances. Secondly, a coordination estimation method is further applied to identify the parameters of the DFIG and the drive train simultaneously with the purpose of attaining the global optimal estimation results. The main benefit of the proposed scheme is the improved estimation accuracy. Estimation results confirm the applicability of the proposed estimation technique.

关键词： wind turbine generator DFIG drive train system hierarchical parameter estimation method trajectory sensitivity technique

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Coordinated Control of DFIG Converters to Comply with Reactive Current Requirements in Emerging Grid Codes

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 502-514页

作者： Yuanzhu Chang Ilhan Kocar Jiabing Hu Ulas Karaagac Ka Wing Chan Jean Mahseredjian the Electrical Engineering Department Polytechnique MontrealMontrealCanada the School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074China the Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina

The doubly-fed induction generator(DFIG)is considered to provide a low-reactance path in the negative-sequence system and naturally comply with requirements on the negative-sequence reactive current in emerging grid *** paper shows otherwise and how the control strategy of converters plays a key role in the formation of the active and reactive current *** investigating the existing control strategies from the perspective of grid code compliance and showing how they fail in addressing emerging requirements on the negative-sequence reactive current,we propose a new coordinated control strategy that complies with reactive current requirements in grid codes in the positive-and negative-sequence *** proposed method fully takes advantage of the current and voltage capacities of both the rotor-side converter(RSC)and grid-side converter(GSC),which enables the grid code compliance of the DFIG under unbalanced three-phase voltages due to asymmetrical *** mathematical investigations and proposed strategy are validated with detailed simulation models using the Electric Power Research Institute(EPRI)benchmark *** derived mathematical expressions provide analytical clarifications on the response of the DFIG in the negative-sequence system from the grid perspective.

关键词： Doubly-fed induction generator(DFIG) negative sequence short circuit wind turbine generator reactive current space vector unbalanced fault phase lock loop(PLL).

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风力发电机定子绕组雷电过电压分布的仿真(英文)

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高电压技术 2011年第11期37卷 2680-2685页

作者：刘嵘刘学忠王莹李丹丹 State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University

This paper analyzes lightning surge on the stator windings of wind turbine *** path of lightning in the wind turbines was *** equivalent circuit model for megawatt direct-driven wind turbine system was developed,in which high-frequency distributed parameters of the blade conducts,tower,power cables and stator windings of generator were calculated based on finite element method,and the models of converter,grounding,loads, surge protection devices and power grid were *** voltage distribution along stator windings,when struck by lightning with 10/350μs wave form and different amplitude current between 50 kA and 200 kA,was simulated using electro-magnetic transient analysis *** simulated results show that the highest coil-to-core voltage peak appears on the last coil or near the neutral of stator windings,and the voltage distribution along the windings is nonuniform *** voltage drops of each coil fall from first to last coil,and the highest voltage drop appears on the first *** insulation damage may occur on the windings under lightning *** surge arresters can restrain the lightning surge in effect and protect the *** coil-to-core voltage in the end of windings is nearly 19.5 kV under the 200 kA lightning current without surge arresters on the terminal of generator,but is only 2.7 kV with arresters.

关键词： equivalent circuit lightning overvoltage stator windings simulation wind turbine generator

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Application of SABO-VMD-KELM in Fault Diagnosis of wind turbines

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Mechanical Engineering Science 2023年第2期5卷 23-29页

作者： Yuling HE Hao CUI Department of Mechanical Engineering North China Electric Power UniversityBaodingHebei071003China

In order to improve the accuracy of wind turbine fault diagnosis,a wind turbine fault diagnosis method based on Subtraction-Average-Based Optimizer(SABO)optimized Variational Mode Decomposition(VMD)and Kernel Extreme Learning Machine(KELM)is ***,the SABO algorithm was used to optimize the VMD parameters and decompose the original signal to obtain the best modal components,and then the nine features were calculated to obtain the feature ***,the SABO algorithm was used to optimize the KELM parameters,and the training set and the test set were divided according to different *** results were compared with the optimized model without SABO *** experimental results show that the fault diagnosis method of wind turbine based on SABO-VMD-KELM model can achieve fault diagnosis quickly and effectively,and has higher accuracy.

关键词： wind turbine generator Fault diagnosis Subtraction-Average-Based Optimizer(SABO) Variational Mode Decomposition(VMD) Kernel Extreme Learning Machine(KELM)

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Impact of emulated inertia from wind power on under-frequency protection schemes of future power systems

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Journal of Modern Power Systems and Clean Energy 2016年第2期4卷 211-218页

作者： Francisco Manuel GONZALEZ-LONGATT Loughborough University Loughborough LE652JGUK

Future power systems face several *** of them is the use of high power converters that decouple new energy sources from the AC power *** situation decreases the total system inertia affecting its ability to overcome system frequency *** wind power industry has created several controllers to enable inertial response on wind turbines generators:artificial,emulated,simulated,or synthetic *** paper deals with the issues related to the emulated inertia of wind turbines based on full-converters and their effect on the under-frequency protection schemes during the recovery period after system frequency disturbances *** main contribution of this paper is to demonstrate the recovery period of under-frequency transients in future power systems which integrate wind turbines with emulated inertia capability does not completely avoid the worse scenarios in terms of under-frequency load *** extra power delivered from a wind turbine during frequency disturbances can substantially reduce the rate of frequency *** it provides time for the active governors to respond.

关键词： Frequency controller Frequency stability Power system Protection scheme wind turbine generator

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A Deep Neural Networks Based on Multi-task Learning and Its Application

A Deep Neural Networks Based on Multi-task Learning and Its ...

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第40届中国控制会议

作者： Mengru Zhao Yuxian Zhang Likui Qiao Deyuan Sun School of Artificial Intelligence Shenyang University of Technology School of Electrical Engineering Shenyang University of Technology Neusoft Medical System Co. Ltd.

With the development of machine learning,the deep neural network has achieved excellent ***,the learning of deep neural network often needs a large number of data and the independent learning of a single task tends to ignore the information from other tasks,resulting in redundant training and the cost of learning *** order to solve these problems,we introduce the deep neural network based on multi-task learning *** introduce the structure of the multi-tasking learning model in detail,and use demographic information to prove the effectiveness of the *** deep neural network based on multi-task learning framework is adapted to builds a normal behavior model for wind turbine generator in which each subspace of operating condition are taken as a *** operating data comes from Liaoning wind farm in northeast China are used to verify the proposed *** results indicate the subspace division of different operating condition benefits to improve the accuracy of normal behavior model of wind turbine generator,and multi-task learning is suitable to deal with the integrate subspace model.

关键词： Multi-task learning Deep neural networks wind turbine generator Normal behavior model Demographic prediction

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Power Flow Control of Renewable Energy Based Distributed generators Using Advanced Power Converter Technologies

Power Flow Control of Renewable Energy Based Distributed Gen...

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作者： Chao-Tsung Ma Tzung-Han Shr Electrical Engineering Department United University

This paper describes a design concept in which a digital controlled power interface embedded with a battery energy storage system(BESS) named battery interfaced static synchronous generator(BISSG) is constructed to improve the power quality of micro-grid(MG) *** distributed generation(DG) systems,e.g.,the wind turbine generator(WTG) and the Photovoltaic(PV) systems conventionally generate real power based on natural conditions thus their output power are fluctuating from time to *** eliminate this shortcoming,the proposed BISSG attempts to smooth the output power of DG with fast charging and discharging its *** achieve a cost-effective design,the proposed BISSG is designed to maximize its control capability in terms of bilateral real power regulation and reactive power compensation for MG voltage support or power factor *** is important to note that the proposed BISSG is able to fulfill various real power dispatching functionalities required by the system *** this paper,the mathematical model of BISSG and its related controllers are firstly ***,simulation studies and hardware tests on a simplified MG network are carried *** results are presented with brief discussions to demonstrate the feasibility and effectiveness of the proposed control scheme.

关键词： Renewable energy wind turbine generator battery interfaced static synchronous generator distributed generation micro-grid

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