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

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A comparative analysis of passive filters for power quality improvement 改进电能质量的无源滤波器的比较分析
Anil Baitha, N. Gupta
This paper presents the design procedure of shunt passive filters for improving power quality by eliminating harmonic distortion caused by non-linear loads. The passive filters include single tuned passive filter (STPF) and double tuned passive filter (DTPF) are considered for analysis purpose. In the design of filters, the parameters of passive elements are obtained for 5th, 7th, 11th and 13th harmonic order component. The DTPF is more effective in removal of harmonic distortion while compared with STPF. The simulation of proposed system is done in the MATLAB/Simulink environment. The various results are satisfied under IEEE- 519 harmonic standard limits.
本文介绍了通过消除非线性负载引起的谐波畸变来改善电能质量的并联无源滤波器的设计过程。无源滤波器包括单调谐无源滤波器(STPF)和双调谐无源滤波器(DTPF)。在滤波器的设计中,得到了5、7、11、13次谐波分量的无源元件参数。与STPF相比,dpf在消除谐波畸变方面更有效。在MATLAB/Simulink环境下对系统进行了仿真。在IEEE- 519谐波标准限值下,各项结果均满足要求。
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引用次数: 25
Multiphase motor based electromechanical actuator for engine gimbal control -prospects & challenges 发动机框架控制中基于多相电机的机电执行器——展望与挑战
P. Anju, Uma Syamkumar, A. Gopinath, B. Jaya, M. N. Namboothiripad
The paper presents a multiphase BLDC motor based electromechanical actuator system for higher capability engine gimbal control applications. The scheme proposed is based on the inherent advantages of the multiphase system together with the requirements of higher power capability actuation system. The paper details the generation of trapezoidal commutation logic for a five phase motor. The modeling of a five phase BLDC motor with sinusoidal back emf and its validation in closed loop as a position servo system is performed in MATLAB/SIMULINK. The evaluation of the inherent fault tolerant capability of the five phase motor based electromechanical actuator is also validated through simulations and the results are highlighted. The hardware implementation of the five phase BLDC motor drive is carried out and the experimental results are presented.
提出了一种基于多相无刷直流电机的机电致动器系统,用于高性能发动机框架控制。该方案是基于多相系统的固有优势,结合大功率驱动系统的要求而提出的。本文详细介绍了五相电机梯形换相逻辑的生成。在MATLAB/SIMULINK中对一种带正弦反电动势的五相无刷直流电机进行了建模,并在闭环中对其作为位置伺服系统进行了验证。通过仿真验证了基于五相电机的机电致动器固有容错能力的评估,并对结果进行了重点介绍。进行了五相无刷直流电机驱动的硬件实现,并给出了实验结果。
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引用次数: 2
Stability analysis of off shore marine current farm connected to grid 并网海上海流场稳定性分析
Satendra Kr Singh Kushwaha, S. T. Nagarajan
This paper presents transient stability analysis of an offshore marine-current farm (MCF) connected to an onshore power grid through conventional ac transmission line and high voltage direct current (HVDC) link. Performances of the studied MCF with SCIG have been analysed in time domain with DIgSILENT Power factory software. A comparison of stability performance of MCF with AC line and HVDC link has been conducted. From this analysis it has been observed that the steady-state and transient stability of MCF is considerably improved with HVDC Link.
本文介绍了通过传统交流输电线路和高压直流输电线路与陆上电网连接的海上海流电站的暂态稳定性分析。利用DIgSILENT Power factory软件对所研究的带SCIG的MCF进行了时域性能分析。对MCF与交流线路和高压直流线路的稳定性能进行了比较。从分析中可以看出,采用高压直流输电线路后,MCF的稳态和暂态稳定性得到了很大的改善。
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引用次数: 1
Voltage stability enhancement during excess load increments through optimal location of UPFC devices 通过UPFC设备的最佳位置,在过载增量期间增强电压稳定性
Aniruddha Ray, J. Chandle
Modern power systems are subjected to widespread line failures due to excess load demands, leading to voltage instability and voltage collapse. The objective of this paper is to study the application of Unified Power Flow Controller (UPFC) devices in improving voltage profile and controlling the power flowing through the transmission lines during excess load increments. Voltage Stability Analysis of the network is carried out by computing the eigen values of the power system reduced Jacobian matrix for each case of load increments before and after placing the UPFC device in the system. The line outage for which we get maximum number of critical eigen values is termed as the critical line outage. Voltage Stability Index is computed for each line corresponding to this critical outage. The line which has got the highest VSI for the critical outage is called as the critical line which indicates the optimal location of UPFC device. After placing the UPFC device on the critical line, the voltage magnitudes of the severely affected buses for this critical load increments is compared with those magnitudes during the critical outage.. The proposed approach is demonstrated on the IEEE 14 bus system in Matlab PSAT( Power system analysis Toolbox) software. The results obtained shows that UPFC devices improves the voltage profile of the buses and controls both active and reactive power flows across the transmission lines thus, preventing their outages during excess load demands and making the power system network voltage stable.
现代电力系统普遍存在因负荷过大而导致的线路故障,从而导致电压不稳定和电压崩溃。本文的目的是研究统一潮流控制器(UPFC)装置在改善电压分布和控制过载增量时通过输电线路的功率方面的应用。通过计算UPFC设备放入系统前后各负荷增量情况下电力系统约简雅比矩阵的特征值,对网络进行电压稳定性分析。临界特征值数目最大的线路中断称为临界线路中断。电压稳定指数计算对应于这一关键停电的每条线路。临界停机时VSI值最高的线路称为临界线,表示UPFC设备的最佳位置。在将UPFC设备放置在关键线上后,将此关键负载增量的严重受影响总线的电压值与关键停电期间的电压值进行比较。该方法在IEEE 14总线系统上用Matlab PSAT(Power system analysis Toolbox)软件进行了验证。结果表明,UPFC设备改善了母线的电压分布,控制了输电线路上的有功和无功功率流,从而防止了在过载需求时母线的中断,使电网电压稳定。
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引用次数: 6
A photovoltaic water pumping system with high efficiency and high lifetime 一种高效、高寿命的光伏抽水系统
S. Parvathy, A. Vivek
A highly efficient, low cost photovoltaic water pumping system integrating a push-pull converter and a three-phase voltage source inverter using a single photovoltaic panel is proposed which has got high life time due to the absence of batteries. The converter steps up the panel voltage and the inverter powers the AC motors for varying speed conditions and it uses a sinusoidal pulse width modulation (SPWM) strategy with 1/6 optimal third harmonic injection. Maximum Power Point Tracking (MPPT) strategy forces the PV to extract the maximum power at the given irradiance level. The voltage reference obtained from this is used in a PI controller to adjust the motor speed. Thus the proposed pumping system works on varying power input and gives varying water output at a given pump head and can be used in isolated locations to deliver water.
提出了一种集成推挽变换器和三相电压源逆变器的高效、低成本的光伏抽水系统,该系统采用单片光伏板,无需电池,具有较高的使用寿命。转换器提高面板电压,逆变器为变速条件下的交流电机供电,它使用正弦脉冲宽度调制(SPWM)策略,具有1/6最优三次谐波注入。最大功率点跟踪(MPPT)策略迫使PV在给定的辐照水平下提取最大功率。由此获得的参考电压用于PI控制器来调整电机速度。因此,所提出的抽水系统在不同的功率输入下工作,并在给定的泵扬程下给出不同的水输出,并且可以在隔离的位置使用来输送水。
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引用次数: 9
Successful operation of large Circulating Fluid Bed Combustion boilers firing high sulfur Indian lignite 燃烧高硫印度褐煤的大型循环流化床燃烧锅炉的成功运行
P. Selvakumaran, A. K. Bakthavatsalam
Over the past decades, designers and operators of fluidized beds have been concentrating on developing the CFBC technology, establishing the optimum operating conditions and troubleshooting associated with refractory, etc. A sorbent, typically limestone or dolomite is used in the fluidized-bed combustion boiler to capture sulfur di-oxides (SO2) in-situ. Due attention has not been paid to understand the limestone characteristics that are not only important for efficient capture of SO2 but also greatly influence the deposition. 125 MWe Circulating Fluidized Bed Combustion (CFBC) boiler experienced severe fouling in back pass of the boiler leading to obstruction of gas flow passage, while using high sulfur lignite with sorbent, calcium carbonate, to capture sulfur dioxide. Optical microscopy of the hard deposits showed mainly anhydrite (CaSO4) and absence of intermediate phases such as calcium oxide or presence of sulfate rims on de-carbonated limestone. It is hypothesized, that loose unreacted calcium oxide that settle on tubes are subjected to re-carbonation and further extended sulfation resulting in hard deposits. Foul probe tests were conducted in selected locations of back pass for five different composition of lignite, with varied high sulfur and ash contents supplied from the mines along with necessary rates of sorbent limestone to control SO2 and the deposits build up rate was determined. The deposit build- up was found increasing, with increase in ash content of lignite, sorbent addition and, percentage of fines in limestone. This paper covers the field modifications and remedial measures carried out to dislodge deposits on heat transfer surfaces, to handle the deposits in ash conveying system, and to control sorbent fines from the milling circuit thereby overcoming the deposit formation and clogging.
在过去的几十年里,流化床的设计人员和操作人员一直致力于CFBC技术的开发,建立最佳的操作条件以及与耐火材料相关的故障排除等。吸附剂,通常是石灰石或白云石,在流化床燃烧锅炉中用于就地捕获二氧化硫(SO2)。石灰石的特性不仅对有效捕获SO2很重要,而且对沉积也有很大的影响,但对这些特性的了解却没有得到应有的重视。125mwe循环流化床燃烧(CFBC)锅炉在采用高硫褐煤和碳酸钙吸附剂捕集二氧化硫时,锅炉后道结垢严重,导致气体流通通道受阻。硬沉积物的光学显微镜显示主要是硬石膏(CaSO4),没有中间相如氧化钙或在脱碳化石灰石上存在硫酸盐环。据推测,松散的未反应的氧化钙沉淀在管受到再碳酸化和进一步延长的硫酸化导致硬沉积物。对五种不同组成的褐煤在选定的后道位置进行了恶臭探针测试,这些褐煤由矿山提供的高硫和高灰分含量以及控制SO2所需的吸附剂石灰石的比例不同,并确定了沉积物的堆积速度。随着褐煤灰分、吸附剂添加量和石灰石细粉含量的增加,沉积物的堆积也在增加。本文介绍了现场改造和补救措施,以消除传热表面上的沉积物,处理灰输送系统中的沉积物,控制来自磨矿回路的吸收剂细粒,从而克服沉积物的形成和堵塞。
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引用次数: 0
Bidirectional buck-boost cascade inverter 双向降压级联逆变器
C. V. Krishnapriya, Sreeja Kochuvila, S. Lekshmi
This paper presents modelling and closed loop control of bidirectional buck boost cascade inverter, which produces an ac output voltage larger than the dc input voltage. The bidirectional inverter is seen as the cascade of a buck stage and a boost stage. The function of buck stage is to maintain main inductor current as a constant value and boost stage is a Current Source Inverter (CSI), which regulates the output voltage. A decoupled analog control scheme is used for inductor current control and output voltage control.
本文介绍了一种产生大于直流输入电压的双向降压升压级联逆变器的建模和闭环控制方法。双向逆变器被视为降压级和升压级的级联。降压级的作用是保持主电感电流恒定,升压级是电流源逆变器(CSI),调节输出电压。电感电流控制和输出电压控制采用解耦模拟控制方案。
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引用次数: 2
Investigations on stability of a hybrid series compensated system with SSSC - ES SSSC - ES混合串联补偿系统的稳定性研究
H. V. Gururaja Rao, N. Prabhu, R. Mala
A static synchronous series compensator equipped with energy storage (SSSC- ES) can provide two degrees of freedom to handle real and reactive power flow through a line. This paper focusses on developing the DQ model of a series compensated system incorporating static synchronous series compensator with energy storage and performing linear analysis. The effect of emulated resistance and reactance by SSSC-ES on system stability is investigated. Eigenvalue and damping torque analysis are carried out and performance of various controllers of SSSC-ES on stability is analyzed.
配备储能的静态同步串联补偿器(SSSC- ES)可以提供两个自由度来处理通过线路的实功率和无功功率。本文建立了包含静态同步串联补偿器和储能的串联补偿系统的DQ模型,并进行了线性分析。研究了SSSC-ES模拟电阻和电抗对系统稳定性的影响。进行了特征值分析和阻尼力矩分析,分析了SSSC-ES各控制器的稳定性性能。
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引用次数: 4
Sepic PFC converter with notch filter based control 基于陷波滤波器控制的专用PFC变换器
B. Sreekala, P. Seema
Sepic power factor correction converters are used now days to reduce the second stage in a two-stage PFC preregulator. Moreover the problem of inverted output voltage can also avoided. But the PFC converters, due to nonlinear effects will create line frequency instabilities and subharmonic oscillations in the line current. This can adversely affect the system and shorten its lifetime. So to avoid these problems a novel control technique has been proposed. A second order Notch filter can be incorporated into the outer voltage compensation loop. The suitable notch gain and quality factor helps to suppress the instabilities and THD in line current and thus enhance the stability of the system. The system has been designed in MATLAB/Simulink software and the performance of control scheme has been verified.
现在使用专用功率因数校正转换器来减少两级PFC预调节器中的第二级。同时也避免了输出电压倒转的问题。但PFC变换器由于非线性效应会产生线频不稳定和线电流的次谐波振荡。这可能会对系统产生不利影响并缩短其使用寿命。为了避免这些问题,提出了一种新的控制技术。一个二阶陷波滤波器可以集成到外部电压补偿回路中。适当的陷波增益和质量因数有助于抑制不稳定性和线路电流的THD,从而提高系统的稳定性。在MATLAB/Simulink软件中对系统进行了设计,并对控制方案的性能进行了验证。
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引用次数: 1
High efficiency control algorithm for power factor correction in air-conditioners 空调功率因数校正的高效控制算法
G. Satish, V. Srikanth
The quality of power is degrading day by day due to heavy use of non-linear loads. Power factor is a measure of effectiveness of electricity usage. AC-DC converters are modified to operate as power factor correction circuit In this paper, a novel control algorithm is developed to provide power factor correction(PFC) of air condition loads so as to optimize its operation. Novel algorithm also aims at controlling the output voltage and speed of compressor motor. Proposed design provides a simple, compact and low cost converter with low voltage stresses. This paper presents the evaluation of a constant frequency active clamped flyback converter for PFC. The work is simulated and analyzed in MATLAB.
由于大量使用非线性负载,电力质量日益下降。功率因数是衡量电力使用效率的指标。本文提出了一种新的控制算法,对空调负荷进行功率因数校正,以优化空调负荷的运行。该算法还旨在控制压缩机电机的输出电压和转速。提出的设计提供了一种简单、紧凑、低成本的低电压应力变换器。本文介绍了一种用于pfc的恒频有源箝位反激变换器的评价方法,并在MATLAB中进行了仿真分析。
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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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