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Thermomechanical loads of powerful turbogenerator stator winding insulation in the presence of water cooling defects 大功率汽轮发电机定子绕组绝缘存在水冷缺陷时的热力载荷
Pub Date : 2023-06-27 DOI: 10.20998/2074-272x.2023.4.11
K. Kuchynskyi, O. H. Kensytsky
Introduction. An analysis of incidents linked to power units’ emergency disconnecting from network as a result of turbogenerators’ malfunction on the NPP of Ukraine is conducted. It is identified, that the reason of the majority of incidents is an insufficient reliability of the stator winding’s direct cooling system. Problem. The most problematic point in winding for today is the frontal parts, where, while cooling is reduced, there are not only thermal, but also thermomechanical loadings on an insulation appearing. The level of these loading depends on structural design of frontal parts and a character of violation of coolant agent circulation in a bar. In some cases they can exceed limit values. The spread and the quality of research on this issue for today are insufficient. Goal. The aim of the completed research is to determine the thermomechanical loading of insulation of stator winding bar in a powerful turbogenerator with a direct liquid cooling under condition when coolant circulation is malfunctioned. Methodology. A complex mathematical model of thermomechanical processes in an insulation of stator winding bar of a powerful turbogenerator is developed. It takes into account the real geometry of the winding bar, variable thermal loading of core elements in radial and axial directions, as well as ways of fixation of slot and frontal winding parts. Studies of thermomechanical processes in an insulation of stator winding bar of turbogenerator are conducted. Results. Values of mechanical displacement and stress for the different modes of malfunction are obtained. Areas of bar, where mechanical loading may exceed the boundaries of mechanical durability of material of insulation of stator winding are identified. With decline of coolant liquid consumption the radial displacement and stress in the winding insulation bar in the area, where the bar exits from the slot are increasing along with that the values of radial stress of insulation of the winding bar in places of frontal parts’ fixation exceed limit values. Practical significance. The offered mathematical models allow to realize calculation experiments and can be used in practice for development and validation of diagnostic systems, analysis, design and investigation of emergency situations during exploitation of turbogenerators on power stations of Ukraine.
介绍。对乌克兰核电站汽轮发电机故障导致的机组紧急断网事故进行了分析。分析发现,大多数事故的原因是定子绕组直接冷却系统可靠性不足。问题。今天绕组中最大的问题是前部部分,在那里,当冷却减少时,不仅有热负荷,而且在绝缘上出现了热机械负荷。这些载荷的水平取决于前部部件的结构设计和冷却剂在杆内循环的违逆特性。在某些情况下,它们可能超过限制值。目前对这一问题的研究范围和质量都不够。的目标。本课题研究的目的是确定大功率直接液冷汽轮发电机定子绕组棒绝缘在冷却剂循环故障情况下的热力学载荷。方法。建立了大功率汽轮发电机定子绕组棒绝缘热力学过程的复杂数学模型。它考虑了缠绕杆的实际几何形状、芯件径向和轴向热载荷的变化以及槽和正面缠绕件的固定方式。对汽轮发电机定子绕组棒绝缘的热力学过程进行了研究。结果。得到了不同故障模式下的机械位移和应力值。确定了机械载荷可能超过定子绕组绝缘材料机械耐久性界限的棒区。随着冷却液用量的减少,缠绕绝缘棒从槽口出的区域内径向位移和应力都在增大,且前缘固定部位缠绕绝缘棒的径向应力均超过极限值。现实意义。所提供的数学模型可实现计算实验,可用于乌克兰电站汽轮发电机运行过程中诊断系统的开发和验证、应急情况的分析、设计和调查。
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引用次数: 0
Model reference adaptive system speed estimator based on type-1 and type-2 fuzzy logic sensorless control of electrical vehicle with electrical differential 基于1型和2型模糊逻辑无传感器控制的电动差动汽车模型参考自适应系统速度估计
Pub Date : 2023-06-27 DOI: 10.20998/2074-272x.2023.4.03
A. Khemis, T. Boutabba, S. Drid
Introduction. In this paper, a new approach for estimating the speed of in-wheel electric vehicles with two independent rear drives is presented. Currently, the variable-speed induction motor replaces the DC motor drive in a wide range of applications, including electric vehicles where quick dynamic response is required. This is now possible as a result of significant improvements in the dynamic performance of electrical drives brought about by technological advancements and development in the fields of power commutation devices, digital signal processing, and, more recently, intelligent control systems. The system’s reliability and robustness are improved, and the cost, size, and upkeep requirements of the induction motor drive are reduced through control strategies without a speed sensor. Successful uses of the induction motor without a sensor have been made for medium- and high-speed operations. However, low speed instability and instability under various charge perturbation conditions continue to be serious issues in this field of study and have not yet been effectively resolved. Some application such as traction drives and cranes are required to maintain the desired level of torque down to low speed levels with uncertain load torque disturbance conditions. Speed and torque control is more important particularly in motor-in-wheel traction drive train configuration where vehicle wheel rim is directly connected to the motor shaft to control the speed and torque. Novelty of the proposed work is to improve the dynamic performance of conventional controller used of model reference adaptive system speed observer using both type-1 and type-2 fuzzy logic controllers. Purpose. In proposed scheme, the performance of the engine is being controlled, fuzzy logic controller is controlling the estimate rotor speed, and results are then compared using type-1 and type-2. Method. For a two-wheeled motorized electric vehicle, a high-performance sensorless wheel motor drive based on both type-2 and type-1 fuzzy logic controllers of the model reference adaptive control system is developed. Results. Proved that, using fuzzy logic type-2 controller the sensorless speed control of the electrical differential of electric vehicle EV observer, much better results are achieved. Practical value. The main possibility of realizing reliable and efficient electric propulsion systems based on intelligent observers (type-2 fuzzy logic) is demonstrated. The research methodology has been designed to facilitate the future experimental implementation on a digital signal processor.
介绍。本文提出了一种估算具有两个独立后驱的轮毂电动汽车速度的新方法。目前,变速感应电机在广泛的应用中取代了直流电机驱动,包括需要快速动态响应的电动汽车。由于电力换流装置、数字信号处理以及最近的智能控制系统等领域的技术进步和发展,电气驱动器的动态性能得到了显著改善,这一点现在成为可能。通过不使用速度传感器的控制策略,提高了系统的可靠性和鲁棒性,降低了感应电机驱动器的成本、尺寸和维护要求。没有传感器的感应电动机已成功地用于中速和高速运行。然而,低速不稳定性和各种电荷摄动条件下的不稳定性仍然是这一研究领域的严重问题,尚未得到有效解决。一些应用,如牵引传动和起重机,需要在不确定的负载扭矩干扰条件下保持所需的扭矩水平到低速水平。速度和转矩的控制在轮中电机牵引传动系统中尤为重要,车辆轮辋直接与电机轴相连以控制速度和转矩。该方法的新颖之处在于,采用1型和2型模糊控制器改进了模型参考自适应系统速度观测器的传统控制器的动态性能。目的。该方案通过对发动机的性能进行控制,采用模糊控制器控制转子转速的估计,并采用1型和2型对估计结果进行比较。方法。针对两轮电动汽车,研制了一种基于模型参考自适应控制系统的2型和1型模糊控制器的高性能无传感器轮式电机驱动系统。结果。实验证明,采用模糊逻辑2型控制器对电动汽车电动观测器的电差速器进行无传感器速度控制,取得了较好的效果。实用价值。论证了基于智能观测器(2型模糊逻辑)实现可靠高效电力推进系统的主要可能性。该研究方法旨在促进未来在数字信号处理器上的实验实现。
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引用次数: 0
Optimization of spatial arrangement of magnetic field sensors of closed loop system of overhead power lines magnetic field active silencing 架空线路磁场主动消声闭环系统磁场传感器空间布置优化
Pub Date : 2023-06-27 DOI: 10.20998/2074-272x.2023.4.04
B. Kuznetsov, T. Nikitina, I. Bovdui, O. Voloshko, V. Kolomiets, B. Kobylianskyi
Aim. Development of a method for optimization of spatial arrangement and angular position of magnetic field sensors of a closed system to ensure maximum efficiency of active silencing canceling of the magnetic field generated by overhead power lines. Methodology. Spatial arrangement and angular position of magnetic field sensors of closed loop system of overhead power lines magnetic field active silencing determined based on binary preference relations of local objective for multi-objective minimax optimization problem, in whith the vector objective function calculated based on Biot–Savart law. The solution of this vector minimax optimization problem calculated based on nonlinear Archimedes algorithm of multi-swarm multi-agent optimization. Results. Results of simulation and experimental research of optimal spatial arrangement and angular position of magnetic field sensors of a closed system to ensure maximum efficiency of active silencing of the magnetic field generated by overhead power lines with a barrel-type arrangement of wires. Originality. The method for optimization of spatial arrangement and angular position of magnetic field sensors of a closed system to ensure maximum efficiency of active shielding of the magnetic field generated by overhead power lines is developed. Practical value. An important practical problem optimization of spatial arrangement and angular position of magnetic field sensors of a closed system to ensure maximum efficiency of active silencing of the magnetic field generated by overhead power lines has been solved.
的目标。开发了一种封闭系统磁场传感器空间布局和角度位置的优化方法,以确保对架空线路产生的磁场进行最大效率的主动消声消除。方法。针对多目标极小极大优化问题,基于局部目标的二元偏好关系,利用基于Biot-Savart定律计算的矢量目标函数,确定了架空电网磁场主动消声闭环系统中磁场传感器的空间布置和角度位置。求解了基于非线性阿基米德算法的矢量极大极小优化问题的多群多智能体优化。结果。封闭系统磁场传感器最佳空间布置和角度位置的仿真与实验研究结果,以保证最大效率地主动消音桶式架空线路产生的磁场。创意。提出了封闭系统中磁场传感器空间布置和角度位置的优化方法,以保证对架空线路产生的磁场的有效屏蔽。实用价值。解决了封闭系统中磁场传感器空间布置和角度位置优化的重要实际问题,以最大限度地提高架空线路产生磁场的主动消声效率。
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引用次数: 0
Investigation of efficient multilevel inverter for photovoltaic energy system and electric vehicle applications 用于光伏能源系统和电动汽车的高效多电平逆变器研究
Pub Date : 2023-06-27 DOI: 10.20998/2074-272x.2023.4.07
E. Parimalasundar, R. Jayanthi, K. Suresh, R. Sindhuja
Introduction. This research presents a simple single-phase pulse-width modulated 7-level inverter topology for renewable system which allows home-grid applications with electric vehicle charging. Although multilevel inverters have appealing qualities, their vast range of application is limited by the use of more switches in the traditional arrangement. As a result, a novel symmetrical 7-level inverter is proposed, which has the fewest number of unidirectional switches with gate circuits, providing the lowest switching losses, conduction losses, total harmonic distortion and higher efficiency than conventional topology. The novelty of the proposed work consists of a novel modular inverter structure for photovoltaic energy system and electric vehicle applications with fewer numbers of switches and compact in size. Purpose. The proposed system aims to reduce switch count, overall harmonic distortions, and power loss. There are no passive filters required, and the constituted optimizes power quality by producing distortion-free sinusoidal output voltage as the level count increases while reducing power losses. Methods. The proposed topology is implemented with MATLAB/Simulink, using gating pulses and various pulse-width modulation methodologies. Moreover, the proposed model also has been validated and compared to the hardware system. Results. Total harmonic distortion, number of power switches, output voltage, current, power losses and number of DC sources are investigated with conventional topology. Practical value. The proposed topology has proven to be extremely beneficial for implementing photovoltaic-based stand-alone multilevel inverter and electric vehicle charging applications.
介绍。本研究提出了一种简单的单相脉宽调制7电平逆变器拓扑结构,用于可再生能源系统,允许家庭电网应用于电动汽车充电。尽管多电平逆变器具有吸引人的特性,但传统的开关配置限制了其广泛的应用范围。因此,提出了一种新型对称7电平逆变器,它具有最少的单向开关和门电路,提供最低的开关损耗、导通损耗、总谐波畸变和比传统拓扑更高的效率。这项工作的新颖之处在于,它采用了一种新颖的模块化逆变器结构,用于光伏能源系统和电动汽车应用,开关数量少,体积小。目的。该系统旨在减少开关计数、整体谐波失真和功率损耗。不需要无源滤波器,并且随着电平计数的增加,该结构通过产生无失真的正弦输出电压来优化电能质量,同时降低了功率损耗。方法。所提出的拓扑是用MATLAB/Simulink实现的,使用门控脉冲和各种脉宽调制方法。此外,所提出的模型也经过了验证,并与硬件系统进行了对比。结果。用传统拓扑研究了总谐波畸变、功率开关数目、输出电压、电流、功率损耗和直流电源数目。实用价值。所提出的拓扑结构已被证明对实现基于光伏的独立多电平逆变器和电动汽车充电应用非常有益。
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引用次数: 4
Enhancing power system security using soft computing and machine learning 利用软计算和机器学习提高电力系统安全性
Pub Date : 2023-06-27 DOI: 10.20998/2074-272x.2023.4.13
Peruthambi Venkatesh, R. Scholar, N. Visali
Purpose. To guarantee proper operation of the system, the suggested method infers the loss of a single transmission line in order to calculate a contingency rating. Methods. The proposed mathematical model with the machine learning with particle swarm optimization algorithm has been used to observe the stability analysis with and without the unified power flow controller and interline power flow controller, as well as the associated costs. This allows for rapid prediction of the most affected transmission line and the location for compensation. Results. Many contingency conditions, such as the failure of a single transmission line and change in the load, are built into the power system. The single transmission line outage and load fluctuation used to determine the contingency ranking are the primary emphasis of this work. Practical value. In order to set up a safe transmission power system, the suggested stability analysis has been quite helpful.
目的。为了保证系统的正常运行,建议的方法是通过推断单线的损耗来计算应急额定值。方法。利用机器学习和粒子群优化算法建立的数学模型,观察了有无统一潮流控制器和线间潮流控制器的稳定性分析,以及相关的成本。这样可以快速预测受影响最大的传输线和补偿的位置。结果。许多突发情况,如单条输电线路的故障和负荷的变化,都被纳入电力系统。采用单线停电和负荷波动来确定应急排序是本工作的主要重点。实用价值。为建设安全的输电系统,提出了稳定分析建议。
{"title":"Enhancing power system security using soft computing and machine learning","authors":"Peruthambi Venkatesh, R. Scholar, N. Visali","doi":"10.20998/2074-272x.2023.4.13","DOIUrl":"https://doi.org/10.20998/2074-272x.2023.4.13","url":null,"abstract":"Purpose. To guarantee proper operation of the system, the suggested method infers the loss of a single transmission line in order to calculate a contingency rating. Methods. The proposed mathematical model with the machine learning with particle swarm optimization algorithm has been used to observe the stability analysis with and without the unified power flow controller and interline power flow controller, as well as the associated costs. This allows for rapid prediction of the most affected transmission line and the location for compensation. Results. Many contingency conditions, such as the failure of a single transmission line and change in the load, are built into the power system. The single transmission line outage and load fluctuation used to determine the contingency ranking are the primary emphasis of this work. Practical value. In order to set up a safe transmission power system, the suggested stability analysis has been quite helpful.","PeriodicalId":170736,"journal":{"name":"Electrical Engineering & Electromechanics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116380374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Voltage regulation using three phase electric spring by fuzzy logic controller 采用模糊控制器对三相电弹簧进行电压调节
Pub Date : 2023-06-27 DOI: 10.20998/2074-272x.2023.4.02
A. Ikhe, Y. Pahariya
Introduction. The renewable energy sources such as solar and wind power have increased significantly in recent years. However, as the generation of renewable energy has become more integrated, its intermission and instability have a major impact on the power system’s stability, such as voltage instability and frequency flicker. Purpose. In order to address the different power quality issues brought on by intermittent and unreliable renewable energy sources, electric spring offers a novel solution. It was proposed as a technique for regulating load and adjusting output power. For the integration of electric springs with noncritical loads, a contemporary control mechanism is described in this paper. Novelty. The suggested work is innovative in that it presents an improved control technique that efficiently maintains voltage stability as voltage changes. Method. The proposed technique is based on an analysis of the initial conditions and input data for developing fuzzy rules for calculating compensating voltages in relation to the difficulties. Results. This suggested fuzzy controller will be able to maintain the regular operation of the electric spring of power output control stability as well as continuing to provide power factor improvement and voltage control for significant loads, including the home’s protection system. Practical value. A detailed study of typical voltage regulation is undertaken, supported by simulation results, to demonstrate the effectiveness of the applied control scheme in cancelling the corresponding issues with power quality.
介绍。近年来,太阳能、风能等可再生能源有了显著增长。然而,随着可再生能源发电的集成化程度越来越高,其间歇性和不稳定性对电力系统的稳定性产生了重大影响,如电压不稳定和频闪等。目的。为了解决间歇性和不可靠的可再生能源带来的不同电能质量问题,电弹簧提供了一种新颖的解决方案。它是一种调节负载和调节输出功率的技术。针对非临界载荷电弹簧的集成问题,本文提出了一种现代控制机制。新鲜事物。建议的工作是创新的,因为它提出了一种改进的控制技术,可以有效地保持电压变化时的电压稳定性。方法。提出的技术是基于对初始条件和输入数据的分析,为计算与困难相关的补偿电压制定模糊规则。结果。这表明模糊控制器将能够保持电力输出控制稳定的电弹簧的正常运行,并继续为包括家庭保护系统在内的重要负载提供功率因数改善和电压控制。实用价值。对典型的电压调节进行了详细的研究,并辅以仿真结果,以证明所应用的控制方案在消除相应的电能质量问题方面的有效性。
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引用次数: 1
Determination of individual values of four-element equivalent circuits elements parameters at technical diagnostics of insulation by absorption methods 吸收法绝缘技术诊断中四元件等效电路元件参数单个值的测定
Pub Date : 2023-06-27 DOI: 10.20998/2074-272x.2023.4.10
V. Kyrylenko, K. Kyrylenko
The aim of this article is to present a methodology of determining of the individual values of the parameters of four-element equivalent circuits for insulation with through conductivity. Methodology. The proposed method consists in the fact that at a time interval of more than 10 s, when the charge indicator no longer contributes to the leakage current, three points t1, t2 and t3 are selected, such that t2 – t1 = t3 – t2. To be able to determine the absorption coefficient R60/R15, it is recommended to take t1 = 15 s, t2 = 37.5 s and t3 = 60 s. At the same time, by subtracting I(t2) – I(t1) and I(t3) – I(t2), the constant component of the absorption curve is excluded and it becomes possible to determine the individual values of the parameters of the generalized equivalent circuit of insulation, additionally using its conductivity in operator form. Results. As calculations show, the correct determination of the parameters of insulation equivalent circuit according to the proposed method is possible only with a certain ratio of these parameters. The charge time of the geometric capacitance Cg(R0+Rd), where R0 and Rd are the resistance that forms the charging exponent, and the resistance of the sensor, should be within 0.2 s
本文的目的是提出一种确定四元等效电路参数的个别值的方法。方法。所提出的方法在于,每隔10 s以上的时间间隔,当充电指示灯不再对漏电流有贡献时,选取t1、t2、t3三个点,使t2 - t1 = t3 - t2。为了确定吸收系数R60/R15,建议取t1 = 15 s, t2 = 37.5 s, t3 = 60 s。同时,通过减去I(t2) - I(t1)和I(t3) - I(t2),可以排除吸收曲线的常数分量,从而可以确定广义等效绝缘电路参数的单个值,另外还可以使用其电导率的算子形式。结果。计算表明,根据所提出的方法,只有在这些参数的一定比例下才能正确确定绝缘等效电路的参数。几何电容的充电时间Cg(R0+Rd),其中R0和Rd是形成充电指数的电阻,传感器的电阻,应在0.2 s以内
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引用次数: 0
Reactive power optimization in distribution systems considering load levels for economic benefit maximization 考虑经济效益最大化负荷水平的配电系统无功优化
Pub Date : 2023-04-23 DOI: 10.20998/2074-272x.2023.3.12
©. G. Srinivasan, V. Mahesh, K. Reddy, P. Venkatesh, E. Parimalasundar, G. Srinivasan, V. Professor, Reddy
Introduction. The need for electrical energy has been increased sharply due to hasty growth in industrials, social and economic improvements. From the previous studies, it has been agreed that almost 13 % of the total power generated is wasted as heat loss at distribution level. It has been extensively recognized that the node voltage profile along the distribution system can be enhanced under steady state power transfer controlled by proper reactive power compensation. Capacitors have been acknowledged as reactive power compensating device in distribution systems to achieve technical and economical benefits. Novelty of this work is the application of Archimedes optimization algorithm for reactive power optimization in distribution systems so as to obtain an improved solution and also a real 94-bus Portuguese network and modified 12-bus network has been taken and validated for three different load levels which are totally new. Purpose of the proposed work is to maximize the economic benefit by reducing the power loss and capacitor purchase cost at three different load conditions subject to satisfaction of equality and inequality constraints. Methods. The economic benefit has been validated using Archimedes optimization algorithm for three load levels considering three distribution systems. Results. The computational outcomes indicated the competence of the proposed methodology in comparison with the previously published works in power loss minimization, bus voltage enhancement and more economical benefit and proved that the proposed methodology performs well compared to other methods in the literature.
介绍。由于工业的迅速发展、社会和经济的改善,对电能的需求急剧增加。从以前的研究中,人们一致认为,几乎13%的总发电量在配电水平上被浪费为热损失。人们普遍认为,通过适当的无功补偿控制,可以提高配电网稳态输电时的节点电压分布。电容器作为配电系统的无功补偿装置,其技术经济效益已得到公认。本工作的新颖之处在于将阿基米德优化算法应用于配电网无功优化,从而得到了一种改进的解决方案,并在三种全新的负荷水平下,采用了真实的94母线葡萄牙电网和改进的12母线电网进行了验证。本文的目的是在满足等式和不等式约束的前提下,通过降低三种不同负载条件下的功率损耗和电容器购买成本,使经济效益最大化。方法。采用阿基米德优化算法对考虑三种配电系统的三种负荷水平进行了经济效益验证。结果。计算结果表明,与先前发表的方法相比,所提出的方法在最小化功率损耗、增强母线电压和提高经济效益方面具有竞争力,并证明所提出的方法与文献中其他方法相比具有良好的性能。
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引用次数: 2
Direct power control using space vector modulation strategy control for wind energy conversion system using three-phase matrix converter 直接功率控制采用空间矢量调制策略控制采用三相矩阵变换器的风能转换系统
Pub Date : 2023-04-23 DOI: 10.20998/2074-272x.2023.3.06
A. Boukadoum, A. Bouguerne, T. Bahi
Introduction. Wind energy conversion system is getting a lot of attention since, they are provide several advantages, such as cost competitive, environmentally clean, and safe renewable power source as compared with the fossil fuel and nuclear power generation. A special type of induction generator, called a doubly fed induction generator is used extensively for high-power wind energy conversion system. They are used more and more in wind turbine applications due to the advantages of variable speed operation range and its four quadrants active and reactive power capabilities, high energy efficiency, and the improved power quality. Wind energy conversion systems require a good choice of power electronic converters for the improvement of the quality of the electrical energy produced at the generator terminals. There are several power electronics converters that are the most popular such as the two stage back-back converter. Because of the disadvantage of these converters to produce large harmonics distortions, we will choose using of three-phase matrix converter. Purpose. Work presents a direct power control using space vector modulation for a doubly fed induction generator based wind turbine. The main strategy control is to control the active and reactive powers and reduce the harmonic distortion of stator currents for variable wind speed. The novelty of the work is to use a doubly fed induction machine and a three pulses matrix converter to reduce the low cost, volume and the elimination of the grid side converter controller are very attractive aspects of the proposed topology compared to the conventional methods such as back-to-back converters. Simulation results are carried out on a 1.5 MW of wind energy conversion system connected to the grid. The efficiency of the proposed system has been simulated and high results performances are evaluated to show the validity of the proposed control strategy to decouple and control the active and reactive power for different values of wind speed.
介绍。与化石燃料发电和核能发电相比,风能转换系统具有成本优势、环境清洁、安全等优点,正受到越来越多的关注。双馈感应发电机是一种特殊类型的感应发电机,广泛用于大功率风能转换系统。由于其变速范围和四象限有功和无功能力、高能效以及电能质量的提高等优点,在风力发电中得到越来越多的应用。风能转换系统需要选择良好的电力电子变流器,以提高发电机终端产生的电能质量。有几种电力电子变换器是最流行的,如两级反-反变换器。由于这些变换器的缺点是产生较大的谐波畸变,我们将选择使用三相矩阵变换器。目的。本文提出了一种采用空间矢量调制的双馈感应发电机直接功率控制方法。主要的控制策略是控制有功和无功功率,减小变风速下定子电流的谐波畸变。这项工作的新颖之处在于使用双馈感应电机和三脉冲矩阵变换器来降低成本,体积和消除电网侧变换器控制器是与传统方法(如背对背变换器)相比,所提出的拓扑结构非常吸引人的方面。对并网的1.5 MW风电转换系统进行了仿真研究。仿真结果表明,所提出的控制策略对不同风速值下的有功和无功解耦和控制是有效的。
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引用次数: 0
Wavelet packet analysis for rotor bar breakage in an inverter induction motor 变频异步电动机转子棒断的小波包分析
Pub Date : 2023-04-23 DOI: 10.20998/2074-272x.2023.3.01
O. Z. I. Abu Ibaid, S. Belhamdi, M. Abid, S. Chakroune, Souhil MOUASSA, Z. S. Al-Sagar
Introduction. In various industrial processes, squirrel cage induction motors are widely employed. These motors can be used in harsh situations, such as non-ventilated spaces, due to their high strength and longevity. These machines are subject to malfunctions such as short circuits and broken bars. Indeed, for the diagnosis several techniques are offered and used. Novelty of the proposed work provides the use of wavelet analysis technology in a continuous and discrete system to detect faults affecting the rotating part of an induction motor fed by a three-phase inverter. Purpose. This paper aims to present a novel technique for diagnosing broken rotor bars in the low-load, stationary induction machine proposed. The technique is used to address the problem of using the traditional Techniques like Fourier Transforms signal processing algorithm by analyzing the stator current envelope. The suggested method is based on the use of discrete wavelet transform and continuous wavelet transform. Methods. A waveform can be monitored at any frequency of interest using the suggested discrete wavelet transform and continuous wavelet transform. To identify the rotor broken bar fault, stator current frequency spectrum is analyzed and then examined. Based on a suitable index, the algorithm separates the healthy motor from the defective one, with 1, 2 and 3 broken bars at no-load. Results. In comparison to the healthy conditions, the recommended index significantly raises under the broken bars conditions. It can identify the problematic conditions with clarity. The possibility of detecting potential faults has been demonstrated (broken bars), using discrete wavelet transform and continuous wavelet transform. The diagnostic method is adaptable to temporary situations brought on by alterations in load and speed. Performance and efficacy of the suggested diagnostic method are demonstrated through simulation in Simulink® MATLAB environment.
介绍。在各种工业过程中,鼠笼式感应电动机得到了广泛的应用。这些电机可以在恶劣的情况下使用,如不通风的空间,由于他们的高强度和寿命。这些机器容易出故障,如短路和断条。事实上,为诊断提供和使用了几种技术。提出的工作的新颖之处在于在连续和离散系统中使用小波分析技术来检测影响三相逆变器馈电感应电机旋转部分的故障。目的。提出了一种诊断低负荷静止感应电机转子断条的新方法。该技术通过分析定子电流包络线,解决了傅立叶变换等传统信号处理算法的问题。该方法基于离散小波变换和连续小波变换的结合。方法。使用建议的离散小波变换和连续小波变换可以在任何感兴趣的频率下监测波形。为了识别转子断条故障,对定子电流频谱进行了分析和检测。该算法根据一个合适的指标,将健康电机与故障电机分开,在空载时分别有1条、2条和3条断条。结果。与健康条件相比,断条条件下的推荐指数显著提高。它可以清晰地识别出有问题的情况。利用离散小波变换和连续小波变换证明了检测潜在故障(断条)的可能性。这种诊断方法适用于负荷和速度变化引起的临时情况。通过Simulink®MATLAB环境下的仿真,验证了所提出的诊断方法的性能和有效性。
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Electrical Engineering &amp; Electromechanics
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