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2015 International Conference on Technological Advancements in Power and Energy (TAP Energy)最新文献

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An accurate fault location method for radial distribution system using one terminal data 基于单端数据的径向配电系统故障精确定位方法
O. Naidu, N. George, S. Ashok
This paper presents an extensive fault location algorithm for in an electrical energy distribution system. The algorithm requires phasor information comprising of voltage and current data from one end of the system in case of a fault event in an electrical distribution system. This algorithm can be used online or offline using the data stored in Digital Fault Recorder (DFR). The proposed fault location algorithm tested with various conditions such as fault resistance, inception angle, source to line impedance rations (SIR), load angle etc by using PSCAD simulations. The PSCAD simulation studies demonstrate that the proposed algorithm give high accuracy under various power system and fault conditions.
提出了一种广泛的配电系统故障定位算法。当配电系统发生故障时,该算法需要由系统一端的电压和电流数据组成的相量信息。该算法可以在线或离线使用存储在数字故障记录仪(DFR)中的数据。通过PSCAD仿真,对所提出的故障定位算法在故障电阻、起始角、源线阻抗比(SIR)、负载角等条件下进行了测试。PSCAD仿真研究表明,该算法在各种电力系统和故障条件下都具有较高的准确率。
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引用次数: 7
Fuzzy logic based load frequency control of grid connected distributed generators 基于模糊逻辑的并网分布式发电机组负荷频率控制
Deepthi Karun, T. Sindhu
With the ever increasing demand for power, conventional energy sources alone cannot be depended upon for power generation. Distributed renewable energy systems are identified as a suitable alternative. However the intermittent nature of these sources increases the frequency deviations which further add to the deviations caused by load variations. Hence it is a prerequisite to keep the system frequency constant. By implementing Load-frequency control (LFC), the frequency deviations can be limited. The main aim of the LFC in an interconnected power system is to keep the frequency deviations in the control areas within the pre-specified limits and to maintain tie-line power flows within the allowable limits while accommodating fluctuating load demands. Here a control strategy for frequency regulation of the distributed PV and Electric Vehicles (EVs) along with the conventional generators is designed using fuzzy logic controller.
随着对电力需求的不断增长,仅依靠传统能源发电是不可能的。分布式可再生能源系统被认为是一种合适的替代方案。然而,这些源的间歇性增加了频率偏差,从而进一步增加了负载变化引起的偏差。因此,保持系统频率恒定是前提条件。通过负载-频率控制(LFC),可以限制频率偏差。在互联电力系统中,LFC的主要目的是将控制区域的频率偏差保持在预先规定的范围内,并在适应波动负载需求的同时将联络线功率流保持在允许的范围内。本文采用模糊控制器设计了分布式光伏和电动汽车以及传统发电机的频率调节控制策略。
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引用次数: 5
Charging coordination of Plug-In Electric Vehicles based on the line flow limits and power losses 基于线路流限和功率损耗的插电式电动汽车充电协调
Prem T. Alluri, J. Solanki, S. K. Solanki
The increased popularity of Plug-In Electric Vehicles (PEVs) over the years has resulted in their large deployment across the traditional Electric Power Grid (EPG). Sudden addition of these highly intermittent, excessive capacity loads along with the increase in generation will result in potential stress, overloading of lines and efficiency degradation of the EPG. To overcome these potential issues, a coordinated PEV charging strategy is proposed in this paper to prevent the overloading of the lines and minimizing the power losses incurred by the random charging of the PEVs. Two factors referred as line flow and power loss sensitivity factors are derived from the Newton Raphson Jacobian to coordinate the charging activities of the PEVs. These sensitivity factors are used to identify the nodes and lines in the EPG that are prone to overload. Charging commands are sent to the identified nodes to assist in a coordinated charging. The proposed methodology is implemented on a small radial IEEE 6 bus distribution system and its performance is demonstrated.
近年来,插电式电动汽车(pev)越来越受欢迎,导致它们在传统电网(EPG)中得到了大规模部署。随着发电量的增加,这些高度间歇性、容量过大的负荷突然增加,将导致潜在的应力、线路过载和EPG效率下降。为了克服这些潜在的问题,本文提出了一种电动汽车协调充电策略,以防止线路过载,并最大限度地减少电动汽车随机充电造成的功率损失。从牛顿-拉夫森-雅可比矩阵中导出了线流和功率损耗敏感因子,以协调电动汽车的充电活动。这些灵敏度因子用于识别EPG中容易过载的节点和线路。充电命令被发送到识别的节点,以协助协调充电。在一个小型径向IEEE 6总线配电系统上实现了该方法,并对其性能进行了验证。
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引用次数: 4
Multilevel inverter fed induction motor drive for pumping application 多电平变频馈电感应电机驱动泵的应用
Charles Baby T, V. S. Sabah, Krishna Prabhakar Lall, A. Chitra
Three phase induction motors are widely used in Industrial drives because of their ruggedness, reliability and simplicity in construction. Accurate control of Induction Machine was always a matter of concern starting from the modulation technique used, to the closed loop control strategy. In this work a complete Induction Motor drive is designed for pumping application with modulation strategy as Sinusoidal pulse width modulation (SPWM) and control scheme as IFOC. The Induction Motor is fed by a cascaded H-Bridge 5 Level MLI and is controlled by Indirect Field Oriented Control (IFOC) technique. In this paper, Multi Carrier PWM technique Alternate Phase Opposition Disposition (APOD) is used to control switching of multilevel inverters. Mathematical model of Pump Load is designed and the performance of the Induction Motor Drive with Pump Load is analyzed using simulation. The affinity law of centrifugal pump is validated using the simulation results obtained.
三相异步电动机因其坚固、可靠和结构简单而广泛应用于工业传动中。从调制技术到闭环控制策略,感应电机的精确控制一直是人们关注的问题。本文采用正弦脉宽调制(SPWM)和IFOC控制方案,设计了一套完整的泵浦用感应电机驱动系统。感应电机由级联h桥5级MLI供电,采用间接场定向控制(IFOC)技术进行控制。本文将多载波PWM技术应用于多电平逆变器的开关控制。设计了泵负载的数学模型,并用仿真方法分析了带泵负载的感应电机驱动的性能。利用仿真结果验证了离心泵的亲和力规律。
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引用次数: 6
Deadbeat controller with phase corrector for 400-Hz inverter used in ground power units of aircrafts 用于飞机地面动力装置的400 hz逆变器带相位校正的无差拍控制器
D. Manohar, P. N. Seema
The digital controller faces a severe phase delay problem in medium frequency inverters while updating the pulse width modulation (PWM) of the inverter. In this paper, a digital controller for maintaining the phase balance and ac voltage regulation of a 400-Hz inverter for the ground power unit (GPU) using Deadbeat control is presented. The disturbance decoupling networks are provided along with the Deadbeat controller to give good disturbance rejection capability and improve the robustness towards the load variations. However, the performance of the digital controller is affected by the sampling, A/D conversion and the execution of the programs in digital processors. To improve the performance, the time delay compensation is done by providing a phase corrector scheme. The difference in phase is measured by Fourier analysis, and the compensation is provided at the reference sinusoidal waveform of the SPWM control strategy. Simulation is done on MATLAB/Simulink platform and the waveforms for single phase as well as three phase bridge circuits are obtained for linear as well as non-linear loads.
数字控制器在更新中频逆变器脉宽调制(PWM)时,面临着中频逆变器中严重的相位延迟问题。本文介绍了一种采用无差拍控制的数字控制器,用于维持400 hz逆变器的相位平衡和交流电压调节。干扰解耦网络与无差拍控制器相结合,具有良好的抗干扰能力,提高了系统对负载变化的鲁棒性。然而,数字控制器的性能受到采样、A/D转换和数字处理器中程序的执行的影响。为了提高性能,通过提供相位校正方案来进行时延补偿。通过傅里叶分析测量相位差,并在SPWM控制策略的参考正弦波形处进行补偿。在MATLAB/Simulink平台上进行仿真,得到了单相和三相桥电路在线性和非线性载荷作用下的波形。
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引用次数: 3
Speed control of BLDC motor drive under DTC scheme using OC with modified integrator 基于改进积分器的无刷直流电动机变频调速控制
T. Ebin Joseph, M. Sreethumol, A. Dinesh Pai
In this paper, speed control of Brushless DC (BLDC) motor drive under Direct Torque Control scheme with modified integrator for flux estimation is investigated using optimal controller. The modified integrator reduces the initial transient in flux linkage in first switching. Here the drive is operated in the constant torque region under the DTC scheme. The performance comparison between PI controller and optimal controller for speed control operation is evaluated. The electrical rotor speed and the back EMF in dq- reference frame is used for the torque estimation. The inverter DC-link voltage, speed and two line currents are measured for control the drive. The effectiveness of the proposed scheme is verified through extensive simulation under MATLAB. Simulation results indicate better speed regulation of BLDC motor achieved using optimal controller.
本文采用最优控制器,研究了基于修正积分器磁链估计的直接转矩控制方案下无刷直流电机的速度控制问题。改进的积分器减小了首次开关磁链中的初始瞬态。在这里,驱动器在DTC方案下的恒转矩区域运行。对PI控制器和最优控制器在速度控制运行中的性能进行了比较。在dq参考系中,利用电机转子转速和反电动势进行转矩估计。测量逆变器直流链路电压、速度和两线电流以控制驱动。在MATLAB下进行了大量仿真,验证了该方案的有效性。仿真结果表明,采用最优控制器对无刷直流电动机的调速效果较好。
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引用次数: 4
Voltage mode control of Bridgeless SEPIC converter for LED lightining applications LED照明用无桥SEPIC变换器的电压模式控制
P. Midhunraj, C. Soumya
A closed loop control of PFC Bridgeless SEPIC converter is introduced in this paper for using it as a low voltage switched mode power supply for LED lightning applications. The PFC bridgeless SEPIC converter discussed here has PFC capability and low conduction losses. The discussed control scheme make use of a voltage control strategy. It retains all features of the bridgeless SEPIC converter moreover; it helps in achieving load regulation. The simulation is done using MATLAB. Simulation results of converter are provided for verifying the control scheme.
介绍了一种PFC无桥SEPIC变换器的闭环控制方法,将其作为LED防雷用的低压开关电源。本文讨论的PFC无桥SEPIC变换器具有PFC性能和低导通损耗。所讨论的控制方案利用了电压控制策略。它还保留了无桥SEPIC变换器的所有特性;它有助于实现负载调节。利用MATLAB进行了仿真。给出了变换器的仿真结果,验证了控制方案的正确性。
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引用次数: 1
High power open end winding based electromechanical actuator for Thrust Vector Control 推力矢量控制的大功率开口绕组机电致动器
Sanjith Mohan, Jose Sebastian T K, A. Gopinath, B. Jaya, M. N. Namboothiripad
The paper proposes an open end winding PMSM based electromechanical actuator for altitude control through Thrust Vector Control. The open end winding configuration with single dc source has the inherent advantage of applying the voltage directly to the phase thus enabling reduced voltage operation. The paper presents the modeling and hardware implementation of the Open end winding PMSM and its drive. The closed loop position control is also carried out to validate the performance of the proposed scheme. The modeling and the simulation study is carried out in MATLAB/SIMULINK. The performance of the proposed system is evaluated through simulation and experimental results.
提出了一种基于开式绕组永磁同步电机的推力矢量控制高度机电致动器。具有单直流电源的开端绕组结构具有将电压直接施加到相位从而实现降低电压操作的固有优点。介绍了开式绕组永磁同步电机及其驱动的建模和硬件实现。通过闭环位置控制验证了所提方案的有效性。在MATLAB/SIMULINK中进行了建模和仿真研究。通过仿真和实验结果对系统的性能进行了评价。
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引用次数: 0
Modelling and vector control of DFIG using multilevel inverter 基于多电平逆变器的DFIG建模与矢量控制
Trupti D. Pingle, Sumit Patil, Sohan Chopde
In this paper, a detailed modelling of Doubly fed Induction Generator (DFIG) and its operation in closed loop control have been realized. Vector control based on stator flux orientation method is used to control the stator Active and Reactive powers independently. Verification of vector control is investigated by creating a 3-phase short circuit at the generator terminals. A cascaded bridge 13-level inverter topology is used in the rotor circuit to study its effect on quality of supply. Further harmonic analysis comparison is done between 3-level and 13-level inverter topology. All the simulation models are built in MATLAB/Simulink software. Results and waveforms clearly show the effectiveness of vector control strategy.
本文对双馈感应发电机(DFIG)进行了详细的建模,实现了其在闭环控制下的运行。采用基于定子磁链定向的矢量控制方法对定子有功和无功进行独立控制。通过在发电机端子处创建三相短路来验证矢量控制。在转子电路中采用级联桥式13电平逆变器拓扑,研究其对供电质量的影响。进一步对3电平和13电平逆变器拓扑结构进行了谐波分析比较。所有仿真模型均在MATLAB/Simulink软件中建立。结果和波形清晰地显示了矢量控制策略的有效性。
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引用次数: 3
Power quality improved hybrid SMPS for PC applications 用于PC应用的电源质量改进混合SMPS
Asha E. Joy, J. Anudev
Many electronic appliances consume standby power, which as per IEC definition is the equipments' lowest level of power intake while in switched on but idle state. The users of these devices are often unaware of such continuous power drain. Computers, that enable better productivity and accuracy, are in common use today. Personal Computers (PC) need stable power inputs that can deliver rigidly regulated and isolated DC outputs of high power quality at different levels. However, the standby power associated with Personal Computers is substantial. Therefore, the primary objective of the project is to develop a Switch Mode Power Supply (SMPS) that integrates with a battery that is charged by solar energy. The battery provides standby power of the requisite quality to the PC. Power factor is improved using buck-boost PFC converter in Discontinuous Conduction Mode at the front end. A half bridge converter has been used at the output end for achieving high frequency isolation and multiple DC output voltages. Such a configuration is considered a better solution to obtain the power quality needed in situations of varying input and load fluctuations conditions. Simulation of the suggested model implemented in Matlab/Simulink Software has demonstrated improved performance for the proposed Hybrid SMPS.
许多电子设备消耗待机功率,根据IEC的定义,待机功率是设备在开机但处于空闲状态时的最低功耗。这些设备的用户通常不知道这种持续的电力消耗。计算机能够提高生产效率和准确性,今天被广泛使用。个人计算机(PC)需要稳定的电源输入,能够提供不同级别的高质量、严格调节、隔离的直流输出。然而,与个人电脑相关的待机功率是相当大的。因此,该项目的主要目标是开发一种与太阳能充电电池集成的开关模式电源(SMPS)。电池为PC机提供所需质量的待机电源。在前端采用断续导通模式的降压升压PFC变换器,提高了功率因数。输出端采用半桥式变换器实现高频隔离和多个直流输出电压。这种配置被认为是在不同输入和负载波动条件下获得所需电能质量的较好解决方案。在Matlab/Simulink软件中对所提出的模型进行了仿真,证明了所提出的混合SMPS的性能有所提高。
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引用次数: 1
期刊
2015 International Conference on Technological Advancements in Power and Energy (TAP Energy)
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