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The Control System Simulation of Variable-Speed Constant-Frequency Wind Turbine
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作者 窦金延 曹娜 《Journal of Measurement Science and Instrumentation》 CAS 2010年第S1期202-206,共5页
In general,Variable-Speed Constant Frequency (VSCF)Wind generation system is controlled by stator voltage orientation method which based on the mathematic model of VSCF Wind generation system and discussed the control... In general,Variable-Speed Constant Frequency (VSCF)Wind generation system is controlled by stator voltage orientation method which based on the mathematic model of VSCF Wind generation system and discussed the control strategy.Present the whole dynamic control model of variable-speed wind generator system in MATLAB/ Simulink,and the simulation results confirm the validity and effectiveness of the proposed control strategy. 展开更多
关键词 variable-speed constant-frequency MODEL wind turbines control system vector control
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The Applications of High-voltage variable frequency speed regulation System in Main Exhauster of Sintering
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作者 Li Jingwei 《International English Education Research》 2015年第9期8-10,共3页
Main Exhauster is one of the main equipment of sintering production. It needs to consume a lot of electricity. Therefore, the system' s reconstruction for energy-saving will effectively reduce electricity for the pro... Main Exhauster is one of the main equipment of sintering production. It needs to consume a lot of electricity. Therefore, the system' s reconstruction for energy-saving will effectively reduce electricity for the production. The paper takes an iron and steel enterprise that had successfully transformed the synchronous motors of main exhauster of sintering as an example, which describes the application of high-voltage variable frequency speed regulation system in main exhauster of Sintering, so as to provide a reference for other iron and steel enterprises. 展开更多
关键词 High-voltage variable frequency speed regulation SINTERING main exhauster.
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On maximum power point tracking control strategy for variable speed constant frequency wind power generation 被引量:1
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作者 倪红军 《Journal of Chongqing University》 CAS 2010年第1期21-28,共8页
Based on the characteristic of AC-excited variable speed constant frequency(VSCF)wind power generation,the vector control technique was applied in a doubly fed induction generator(DFIG).Maximum wind energy or maximum ... Based on the characteristic of AC-excited variable speed constant frequency(VSCF)wind power generation,the vector control technique was applied in a doubly fed induction generator(DFIG).Maximum wind energy or maximum output power point can be tracked by decoupling control of active power and reactive power.The research result shows that the net power of generation system delivered to grid in maximum wind energy tracking mode is not the most.We presented a novel maximum power point tracking(MPPT)control strategy by analyzing the DFIG mathematic model and power relations which delivered the maximum power to the grid.The maximum power point could be tracked automatically without measuring wind speed in the control strategy and the control was independent of optimal turbine power curve,which had excellent dynamic and static performances and robustness.Simulation and experimental results testify the accuracy and validity of the control strategy. 展开更多
关键词 variable speed constant frequency grid voltage orientation DECOUPLING maximum power point tracking
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A Recursive Method of Time-Frequency Analysis for the Signal Processing of Flutter Test with Progression Variable Speed 被引量:1
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作者 宋叔飚 裴承鸣 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2005年第3期213-217,共5页
Focused on the non-statlonarity and real-time analysis of signal in flutter test with progression variable speed (FTPVS), a new method of recursive time-frequency analysis is presented. The time-varying system is tr... Focused on the non-statlonarity and real-time analysis of signal in flutter test with progression variable speed (FTPVS), a new method of recursive time-frequency analysis is presented. The time-varying system is tracked on-line by building a time-varying parameter model, and then the relevant parameter spectrum can be obtained. The feasibility and advantages of the method are examined by digital simulation. The results of FTPVS at low-speed wind-tunnel promise the engineering application perspective of the method. 展开更多
关键词 flutter test with progression variable speed (FTPVS) non-stationary signal processing recursive time-frequency analysis (RTFA)
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Optimal Driving of Large Belt Conveyor with Multi-roller Variable-Frequency Drive 被引量:1
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作者 付俊青 王聪 李玉瑾 《Journal of China University of Mining and Technology》 2004年第2期231-237,共7页
in this paper, an electromechanically coupled mathematic model of multi-roller driving system for belt conveyor is set up, and the computing equations for dynamic displacement and dynamic tension of the conveyor are a... in this paper, an electromechanically coupled mathematic model of multi-roller driving system for belt conveyor is set up, and the computing equations for dynamic displacement and dynamic tension of the conveyor are also formulated when the hoister is used for straining. Based on the belt conveyor of main inclined shaft in Chengzhuang coal mine, the driving torque, driving power and starting-speed characteristic of each electric motor are studied and measured when multi-roller variable-frequency drive (power distribution 2∶1) is used. The optimal control and the optimal starting-acceleration of the multi-roller variable-frequency drive are determined by a large number of industrial experiments and theoretical calculations. 展开更多
关键词 BELT CONVEYOR multi-roller variable-frequency drive ELECTROMECHANICAL coupled mathematic model control CHARACTERISTIC starting-acceleration CHARACTERISTIC
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Generic Reliability Evaluation Method for Industrial Grids with Variable Frequency Drives
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作者 Rongrong Yu Yao Chen +1 位作者 Jiuping Pan Richard W Vesel 《Energy and Power Engineering》 2013年第4期83-88,共6页
The paper presents a reliability evaluation method based on fault tree analysis with set theory and minimal cut set as core algorithm, which can be used to evaluate the reliability for industrial grids with wide appli... The paper presents a reliability evaluation method based on fault tree analysis with set theory and minimal cut set as core algorithm, which can be used to evaluate the reliability for industrial grids with wide application of variable frequency drives. The working principle is introduced firstly, based on which the method development considering different system topology designs, backup solutions and redundancy mechanisms are analyzed in details. In the end the proposed method is applied to two cases to show the reliability performance of system with variable frequency drives. The proposed method is also suitable for analyzing the reliability performance of industrial grids with other types of power electronic converter technology. 展开更多
关键词 Fault Tree Analysis MINIMAL CUT Set RELIABILITY INDUSTRIAL Grids variable frequency driveS
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The performance analysis and calculation for variable frequency speed control motors with the rotor structure optimized
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作者 曹君慈 李伟力 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2005年第6期710-714,共5页
In the paper, the method to optimize the rotor structure in variable frequency speed control motors is introduced. The saturation and the skin effect are considered and 2D no-load and load electromagnetic field is cal... In the paper, the method to optimize the rotor structure in variable frequency speed control motors is introduced. The saturation and the skin effect are considered and 2D no-load and load electromagnetic field is calculated in finite elements for a variable frequency speed control motor before and after optimization. Finally, no-load current and operation performance before and after optimization are obtained and the two results are contrasted. 展开更多
关键词 variable frequency speed control optimization design finite element operation performance
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Microcontroller-Based Variable Speed Drive for Three-Phase Induction Motor in Cooling Applications
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作者 Kondapalli Siva Rama Rao Lee Teng Hong 《Journal of Energy and Power Engineering》 2012年第4期656-662,共7页
This paper presents an electronic VSD (variable speed drive) for three-phase IM (induction motor) using a microcontroller. The VSD is designed for cooling applications where the 1M is coupled to a cooling fan. The... This paper presents an electronic VSD (variable speed drive) for three-phase IM (induction motor) using a microcontroller. The VSD is designed for cooling applications where the 1M is coupled to a cooling fan. The drive receives temperature feedback from objects to be cooled and output a corresponding frequency to the IM. A prototype of the VSD is constructed to control a 175 W, four pole, squirrel cage three-phase IM. The heart of the control circuit is a low-cost microchip's PICI6F777 microcontroller which is programmed using C language to generate variable frequency SPWM (sinusoidal pulse width modulation) switching signals. These switching signals are fed to an 1GBT inverter. The VSD constructed can be switched between two modes of speed control" automatic temperature-controlled mode and manual user-controlled mode. Cost savings using the prototype are demonstrated. 展开更多
关键词 IGBT inverter PIC microcontroller SPWM three-phase induction motor variable speed drive.
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Analysis of Electrical and Non-electrical Causes of Variable Frequency Drive Failures
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作者 Osama A. Al-Naseem Mohamed A. EI-Sayed 《Journal of Energy and Power Engineering》 2014年第4期693-701,共9页
VFDs (variable frequency drives) are an integral part of many industrial plants and stations. Reliable operation and maintenance of these drives is vital to ensure sustained plant operation and availability. Underst... VFDs (variable frequency drives) are an integral part of many industrial plants and stations. Reliable operation and maintenance of these drives is vital to ensure sustained plant operation and availability. Understanding of the principles of operation of VFD systems as well as knowledge about their required operating environment is necessary for all operating personnel. Many times the operating personnel do not get involved with different technical issues until a complete failure has occurred. Hence, the awareness of the most dominant failure causes has a significant impact on assisting operators to avoid catastrophic failures and tremendous economic losses due to VFD shutdown. Proper plant design, accurate monitoring and data logging, following manufacturer preventive maintenance schedule, and choosing qualified team of operators can be the key to an efficient operation and a long lifetime for any VFD system. In this paper, we have analyzed the electrical and non-electrical causes of VFD failures based on a case study of a typical medium voltage VFD pumping station. Finally, recommendations are given from field analysis and observations. 展开更多
关键词 VFDs variable speed drives) ASD (adjustable speed drive electrical fault causes non-electrical fault causes SCADA twelve-pulse power electric inverter rectifier flashover inverter short-circuit.
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Cavitation Detection in Variable Speed Pump by Analyzing the Acoustic and Vibration Spectrums 被引量:6
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作者 Ashraf Kotb Abdulaziz Morgan Abdulaziz 《Engineering(科研)》 2015年第10期706-716,共11页
Cavitation in pumps must be detected and prevented. The present work is an attempt to use the simultaneous measurements of vibration and sound for variable speed pump to detect cavitation. It is an attempt to declare ... Cavitation in pumps must be detected and prevented. The present work is an attempt to use the simultaneous measurements of vibration and sound for variable speed pump to detect cavitation. It is an attempt to declare the relationship between the vibration and sound for the same discharge of 780 L/h and NPSHA of 0.754 at variable speeds of 1476 rpm, 1644 rpm, 1932 rpm, 2190 rpm, 2466 rpm, and 2682 rpm. Results showed that: the occurrence of cavitation depends on the rotational speed, and the sound signals in both no cavitation and cavitation conditions appear in random manner. While, surveying the vibration and sound spectrums at the second, third, and fourth blade passing frequencies reveals no indications or phenomenon associated with the cavitation at variable speeds. It is recommended to survey the vibration spectra at the rotational and blade passing frequencies simultaneously as a detection unique method of cavitation. 展开更多
关键词 CENTRIFUGAL Pump CAVITATION Vibration BLADE PASSING frequency variable speed
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Switched Reluctance Generator for Variable Speed Wind Energy Applications 被引量:1
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作者 Amissa Arifin Ibrahim Al-Bahadly 《Smart Grid and Renewable Energy》 2011年第1期27-36,共10页
The aim of this paper is to analyze the potential of switched reluctance generator (SRG) in wind energy application. The machine comprises of switched reluctance generator, power converter and controller. In this pape... The aim of this paper is to analyze the potential of switched reluctance generator (SRG) in wind energy application. The machine comprises of switched reluctance generator, power converter and controller. In this paper the main ele-ments that form the generator system is discussed. It also highlights the common type of converter and structure used for SRG in wind energy application and types of control strategy available. Using power converter for switching the generator can operate over a wide speed range. Its applications in high speed area such as starter/generator for air-craft and gas turbine has been established, however the low/medium speed operation is still at an early stage of re-search. In order to subject the machine to various parameters, offline modeling is being investigated to produce the best optimum design. 展开更多
关键词 SWITCHED Reluctance GENERATOR (SRG) WIND Energy variable speed driveS
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Long-term operation optimization of circulating cooling water systems under fouling conditions
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作者 Jiarui Liang Yong Tian +3 位作者 Shutong Yang Yong Wang Ruiqi Yin Yufei Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第1期255-267,共13页
Fouling caused by excess metal ions in hard water can negatively impact the performance of the circulating cooling water system(CCWS)by depositing ions on the heat exchanger's surface.Currently,the operation optim... Fouling caused by excess metal ions in hard water can negatively impact the performance of the circulating cooling water system(CCWS)by depositing ions on the heat exchanger's surface.Currently,the operation optimization of CCWS often prioritizes short-term flow velocity optimization for minimizing power consumption,without considering fouling.However,low flow velocity promotes fouling.Therefore,it's crucial to balance fouling and energy/water conservation for optimal CCWS long-term operation.This study proposes a mixed-integer nonlinear programming(MINLP)model to achieve this goal.The model considers fouling in the pipeline,dynamic concentration cycle,and variable frequency drive to optimize the synergy between heat transfer,pressure drop,and fouling.By optimizing the concentration cycle of the CCWS,water conservation and fouling control can be achieved.The model can obtain the optimal operating parameters for different operation intervals,including the number of pumps,frequency,and valve local resistance coefficient.Sensitivity experiments on cycle and environmental temperature reveal that as the cycle increases,the marginal benefits of energy/water conservation decrease.In periods with minimal impact on fouling rate,energy/water conservation can be achieved by increasing the cycle while maintaining a low fouling rate.Overall,the proposed model has significant energy/water saving effects and can comprehensively optimize the CCWS through its incorporation of fouling and cycle optimization. 展开更多
关键词 Computer simulation Circulating water system FOULING Concentration cycle OPTIMIZATION variable frequency drive
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Asymptotic Tracking Control for Wind Turbines in Variable Speed Mode 被引量:1
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作者 Wei Lin Zongtao Lu Wei Wei 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2017年第3期569-576,共8页
This paper presents a variable speed control strategy for wind turbines in order to capture maximum wind power.Wind turbines are modeled as a two-mass drive-train system with generator torque control.Based on the obta... This paper presents a variable speed control strategy for wind turbines in order to capture maximum wind power.Wind turbines are modeled as a two-mass drive-train system with generator torque control.Based on the obtained wind turbine model,variable speed control schemes are developed.Nonlinear tracking controllers are designed to achieve asymptotic tracking for a prescribed rotor speed reference signal so as to yield maximum wind power capture.Due to the difficulty of torsional angle measurement,an observer-based control scheme that uses only rotor speed information is further developed for global asymptotic output tracking.The effectiveness of the proposed control methods is illustrated by simulation results. 展开更多
关键词 Asymptotic tracking partial-state and output feedback two-mass drive-train model variable speed control wind turbines
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ASSESSMENT OF AN ELECTRO MECHANICAL DIFFERENTIAL GEAR PROVIDING VARIABLE SPEED TO INDUSTRIAL APPLICATIONS
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作者 Maximilian Hehenberger 《风机技术》 2016年第3期78-83,共6页
当前,标准工业应用对于整体传动系统效率的要求日益提高,如压缩机、鼓风机、风扇及水泵。现有的系统如VFD或液压变速控制系统不能满足能源成本的需求。几年前一个创新性的变速系统EMDS(机电差速系统)出现在市场上,在总效率和初始成本上... 当前,标准工业应用对于整体传动系统效率的要求日益提高,如压缩机、鼓风机、风扇及水泵。现有的系统如VFD或液压变速控制系统不能满足能源成本的需求。几年前一个创新性的变速系统EMDS(机电差速系统)出现在市场上,在总效率和初始成本上显示出巨大的潜力。该系统由一个主驱动(直接连接电网)、一个包含行星齿轮级的齿轮箱和一个伺服变频控制驱动组成。伺服驱动(最大为系统总功率的20%)通过主驱动的恒定速度来控制齿轮箱输出速度。此外这一设置使得电力元件最少化同时在整个传动当中占用空间小。研究表明,该系统可应用于最高至15MW和15 000r/min速度的变速应用上。长期运行将证明,该方案是否能安全满足工业的高标准和需求。作者对比了EMDS和其他变速系统的技术优势,并分析了EMDS的技术原理并包括详细的效率对比。此外还给出了实际应用证明案例。 展开更多
关键词 机电差速齿轮 驱动机构 电机 变速 低压变频器
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High Performance Servo-System of a Motor in Driect Drive Robotics
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作者 Feng Yong Wang Yan Hu Hengzhang (Department of Electrical Engineering) 《哈尔滨工业大学学报》 EI CAS CSCD 北大核心 1990年第3期99-104,共6页
This paper decribes the control of a high performance variable reluctance motor system for direct drive robotics and industrial automation. The control system of a motor comists of a drive unit and a digital controlle... This paper decribes the control of a high performance variable reluctance motor system for direct drive robotics and industrial automation. The control system of a motor comists of a drive unit and a digital controller, possessing two functions of tbe analog dosed-loop control of motor velocity and the digit dosed-loop control of motor position. Then it discusses the closed-loop control of current in the three phases of the motor and the control of the lead angle of the motor. Finally, it suggests a design of the control circuits of motor current, velocity and position. The closed loop control of the motor position is achieved by a digit cotroller which consists of a microprocessor and other electronic components. It can control two variable reluctance motors simultaneusly. In order to be used for directly driving robots, the digit cotroller is equipped with a universal interface. 展开更多
关键词 直接驱动机器人 转矩控制 速度控制 位置控制 变磁阻电动机 伺服系统
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Single Phase Induction Motor Drive with Restrained Speed and Torque Ripples Using Neural Network Predictive Controller
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作者 S. Saravanan K. Geetha 《Circuits and Systems》 2016年第11期3670-3684,共15页
In industrial drives, electric motors are extensively utilized to impart motion control and induction motors are the most familiar drive at present due to its extensive performance characteristic similar with that of ... In industrial drives, electric motors are extensively utilized to impart motion control and induction motors are the most familiar drive at present due to its extensive performance characteristic similar with that of DC drives. Precise control of drives is the main attribute in industries to optimize the performance and to increase its production rate. In motion control, the major considerations are the torque and speed ripples. Design of controllers has become increasingly complex to such systems for better management of energy and raw materials to attain optimal performance. Meager parameter appraisal results are unsuitable, leading to unstable operation. The rapid intensification of digital computer revolutionizes to practice precise control and allows implementation of advanced control strategy to extremely multifaceted systems. To solve complex control problems, model predictive control is an authoritative scheme, which exploits an explicit model of the process to be controlled. This paper presents a predictive control strategy by a neural network predictive controller based single phase induction motor drive to minimize the speed and torque ripples. The proposed method exhibits better performance than the conventional controller and validity of the proposed method is verified by the simulation results using MATLAB software. 展开更多
关键词 Dynamic Model Low Torque Ripples Neural Model Neural Network Predictive Controller Unstable Operation Single Phase Induction Motor variable speed drives
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Circulating current suppression for ground tied variable frequency to constant frequency converter system in aircraft
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作者 Wei WEI Ming HUANG +2 位作者 Wenli YAO Weilin LI Xiaobin ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第11期386-397,共12页
This paper presents a solution to the circulating current fault of aircraft power supply.The DC-link type Variable Frequency to Constant Frequency(VFCF)converter system is the preferred scheme to feed the constant 400... This paper presents a solution to the circulating current fault of aircraft power supply.The DC-link type Variable Frequency to Constant Frequency(VFCF)converter system is the preferred scheme to feed the constant 400 Hz load in an aircraft with a variable frequency power supply.Due to the requirement of aircraft standards,both grounds of the rectification and inversion stage are tied to the metal frame of the aircraft.With such a tied ground,the DC bus voltage rises greatly,and a large circulating current appears in the casing as the ground,which leads to equipment failure and potential safety hazards.According to the existing methods of circulating current fault suppression,this paper analyzes the causes of the above faults and the harmonic components of circulating current and points out the limitations of the existing methods.Therefore,a Common-Mode(CM)choke-based method is proposed to provide a high impedance in the path of the CM circulating current.By doing so,the circulating current can be suppressed without the additional burden of the hardware and control algorithm,which is quite friendly for quality control of mass-production aircraft.Moreover,a simplified mathematic model of the VFCF converter system is derived to calculate the minimum inductance value reference of the CM choke,which saves the weight of passive devices to the greatest extent.Finally,simulation and experimental results are studied to verify the effectiveness of the proposed method. 展开更多
关键词 Aircraft power supply Circulating current Common mode choke Power supply circuits variable speed Constant frequency
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智能化视角下造纸机传动系统变频调速控制研究 被引量:2
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作者 卫海 邹俊俊 《造纸科学与技术》 2024年第3期103-106,共4页
在当今造纸行业向智能化转型的背景下,造纸机作为纸张生产的核心设备,其传动系统的高效运行对整体生产效率和产品质量起着决定性作用。电气自动化与变频调速技术的深入应用,极大地推动了造纸机控制系统的技术进步,为实现造纸机械高效、... 在当今造纸行业向智能化转型的背景下,造纸机作为纸张生产的核心设备,其传动系统的高效运行对整体生产效率和产品质量起着决定性作用。电气自动化与变频调速技术的深入应用,极大地推动了造纸机控制系统的技术进步,为实现造纸机械高效、稳定生产提供了坚实的技术基础。基于此,在探讨造纸机传动控制系统的构成与设计关键点,并针对常见的变频调速技术进行分析,特别是直接转矩控制(DTC)算法在优化传动系统中减少异步电机电磁转矩波动、降低能耗、提升效率方面的应用,旨在为造纸机传动系统的优化提供切实可行的解决方案。 展开更多
关键词 造纸机 传动系统 异步电机 变频调速 电磁转矩
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变转速下基于改进多阶概率方法的风电齿轮箱故障诊断研究
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作者 刘长良 刘少康 +2 位作者 李洋 刘帅 武英杰 《仪器仪表学报》 EI CAS CSCD 北大核心 2024年第5期208-217,共10页
阶次跟踪是一种有效的解决变转速故障诊断问题的方法,其关键前提是存在转速信号作为参考。然而,由于强背景噪声和弱谐波关系的影响,现有转速估计方法的准确性和自适应性有待进一步提高。因此,提出一种融合多传感器信号的改进多阶概率方... 阶次跟踪是一种有效的解决变转速故障诊断问题的方法,其关键前提是存在转速信号作为参考。然而,由于强背景噪声和弱谐波关系的影响,现有转速估计方法的准确性和自适应性有待进一步提高。因此,提出一种融合多传感器信号的改进多阶概率方法(MOPA)用以估计瞬时转速。首先,依据不同传感器信号的基频统一性和主导分量差异性,通过时频图瞬时切片归一化融合的方式,构建具有强谐波关系的时频图;其次,为消除时变工况下时频图中横纵方向上的间歇恒频和短时宽频背景噪声,提出滑动消噪方法;最后,基于处理后的时频图执行MOPA,实现瞬时转速自动估计,结合阶次跟踪解决风电齿轮箱变转速故障诊断问题。经实测数据验证,改进MOPA估计的瞬时频率的准确性和自适应性均优于对方法,平均绝对百分比误差为0.56%,均小于对比方法的15.73%、13.99%和1.21%。结合阶次分析诊断了变转速下风电齿轮箱异常。 展开更多
关键词 变转速 故障诊断 风电齿轮箱 瞬时频率 阶次跟踪
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基于运动合成的旋转变速运动建模及其驱动机构演变
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作者 袁汝旺 李文豪 《纺织学报》 EI CAS CSCD 北大核心 2024年第9期220-227,共8页
为满足织机开口运动停—升—停的工艺特性及其动力学性能,提出一种基于运动合成的旋转变速运动规律构造方法。从组合机构角度提出旋转变速运动驱动机构及其演变,建立不同驱动机构的相对运动传递函数模型。采用目标优化法对旋转变速机构... 为满足织机开口运动停—升—停的工艺特性及其动力学性能,提出一种基于运动合成的旋转变速运动规律构造方法。从组合机构角度提出旋转变速运动驱动机构及其演变,建立不同驱动机构的相对运动传递函数模型。采用目标优化法对旋转变速机构尺寸参数进行设计,在相同的中心距半径和转子臂初始位置的情况下建立优化函数并进行求解。仿真结果表明:偏移系数是影响旋转变速运动的关键参数,且变速运动静止时间、相对位移和速度峰值随偏移系数增加而减小;传递函数是影响旋转变速机构运动特性的重要参数,当偏移系数为0.4147时,随传动比的减小,转子臂相对位移减小,同时影响旋转变速机构凸轮特性,传动比大于0.9后不能满足旋转变速机构约束条件;用导杆滑块机构和铰接四杆机构对齿轮机构进行代换,可近似实现变速规律相对运动的传递,其传动误差分别为0.010、0.003 rad;通过减小中心距对铰接四杆机构重新优化可以提高旋转变速机构传动性能,满足高速运动需求。 展开更多
关键词 运动合成 旋转变速运动 驱动变速机构 偏移系数 目标优化 织机开口
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