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2017 6th International Conference on Computer Applications In Electrical Engineering-Recent Advances (CERA)最新文献

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LPPT control of a photovoltaic system against sudden drop of irradiance 光伏系统抗辐照度突然下降的LPPT控制
M. K. Reddy, V. Sarkar
The objective of this paper is to deal with the problem of false convergence in the occasion of sudden drop of irradiance during limited power point tracking (LPPT) control of a photovoltaic (PV) system. In the case of LPPT control, the power output of a PV array is operating at a specified reference power level that is below the maximum power point (MPP). Because of sudden drop of irradiance, the power output of PV system may suddenly become zero and, subsequently, get stuck there unless the irradiance level is significantly raised again. The particular problem happens because of MPPT convergence detector that is used in existing LPPT controller in the case of power scarcity. Here, the new MPPT convergence detector is developed to avoid the false convergence problem. The proposed algorithm is compared with a conventional LPPT algorithm and tested through MATLAB simulation.
研究了光伏系统有限功率点跟踪控制中辐照度突然下降情况下的假收敛问题。在LPPT控制的情况下,光伏阵列的输出功率在低于最大功率点(MPP)的指定参考功率水平上运行。由于辐照度的突然下降,光伏系统的输出功率可能会突然变为零,然后陷入停滞状态,除非辐照度再次显著提高。在电力短缺的情况下,现有LPPT控制器中使用的MPPT收敛检测器会产生特殊的问题。为了避免假收敛问题,本文设计了一种新的MPPT收敛检测器。将该算法与传统的LPPT算法进行了比较,并通过MATLAB仿真进行了测试。
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引用次数: 3
Phase based single-channel speech enhancement using phase ratio 基于相位的使用相位比的单通道语音增强
Sachin Singh, A. Mutawa, Monika Gupta, M. Tripathy, R. Anand
In this paper, a novel method based on the phase of noisy speech and noise signals is proposed. Phase ratio based two gain functions (G1 and G2) are developed and used for correction in noisy phase to suppress noises coming from angles 0 to ±π/2 and π/2 to ±π, respectively. For the reconstruction, both gains G1 and G2 were multiplied and lower values of the phases were neglected, which gives enhancement in speech. Objective speech intelligibility measures, informal subjective listening tests and spectrogram analysis were used for finding the effectiveness of the proposed method.
本文提出了一种基于噪声语音和噪声信号相位的新方法。基于相位比的两个增益函数(G1和G2)分别用于相位校正,以抑制来自0 ~±π/2角和π/2 ~±π角的噪声。在重构中,将增益G1和G2相乘,忽略相位较低的值,从而增强语音。通过客观的语音清晰度测量、非正式的主观听力测试和频谱图分析来发现所提出方法的有效性。
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引用次数: 6
Power flow and economic dispatch of a microgrid in presence of feeder flow control distributed generators 存在馈线流控制的分布式发电机的微电网潮流与经济调度
A. Maulik, D. Das
In this paper, a power flow method and an economic dispatch model of a microgrid with feeder flow control (FFC) distributed generators (DGs) are formulated. When FFC DGs are present, the microgrid exchanges a prescheduled amount of active and reactive power with the main grid, and therefore, the substation power is known a priori. Under such a circumstance, the conventional classification of the system buses into slack, load and generator buses is not sufficient, and the bus classification has to be extended. So, a new power flow technique capable of dealing with such a situation is formulated in this paper. Further, for economic load dispatch with system loss, penalty factors are required to be calculated. Calculation of penalty factors with FFC mode DGs is different from that in a conventional system. An analytical method of finding the penalty factors is also presented in this paper. The developed power flow and economic dispatch methods are validated on a test microgrid system.
本文建立了带馈线流控制(FFC)分布式发电机的微电网潮流计算方法和经济调度模型。当FFC dg存在时,微电网与主电网交换预定数量的有功和无功功率,因此,变电站功率是先验已知的。在这种情况下,传统的系统母线分为空闲母线、负载母线和发电机母线的分类是不充分的,必须扩展母线分类。因此,本文提出了一种新的能处理这种情况的潮流技术。此外,对于具有系统损耗的经济负荷调度,需要计算惩罚因子。FFC模式DGs的罚因子计算不同于传统系统。本文还提出了一种寻找惩罚因子的解析方法。本文提出的潮流和经济调度方法在微电网系统中得到了验证。
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引用次数: 8
Longterm analysis of wind speed and wind power resource assessment for the site Vijayawada, Andhra Pradesh, India 印度安得拉邦维杰亚瓦达站点的长期风速分析和风力资源评价
K. Murthy, O. P. Rahi, Preeti Sonkar, S. Ram
This paper aims to investigates longterm variability of wind speed and wind power resource assessment using statistical based Weibull probability distribution approach. This research work has been carried out for the selected site Vijayawada located in the central region of Andhra Pradesh, India for the first time. In this context, the global Modern Era Retrospective Analysis for Research and Applications (MERRA) daily wind datasets has been considered for the long term analysis spanning over 36 years (1981–2016) at 10 m height a.g.l. Two-parameter Weibull probability and cumulative distribution models have been used to tap the wind power potential. Thereafter, an empirical method proposed by Lysen has been used to calculate the Weibull distribution parameters such as shape (k, dimensionless) and scale (c, m/s) factors. In addition, variations in wind speed characteristics namely mean wind speed (vm, m/s), maximum wind speed (vmax, m/s), most probable wind speed (vmp, m/s), maximum energy carrying wind speeds (vme, m/s) have been determined on the monthly, annual, seasonal basis. Finally, this work will help as guiding document for power and energy engineers, policy makers, as well as for researchers working in this area for providing solution to the problem of burgeoning gap between demand and supply of energy.
本文旨在利用基于统计的威布尔概率分布方法研究风速的长期变异性和风电资源评价。这项研究工作首次在位于印度安得拉邦中部地区的选定地点Vijayawada进行。在此背景下,考虑了全球现代研究与应用回顾性分析(MERRA)每日风数据集,以10米高度进行了36年(1981-2016)的长期分析。双参数威布尔概率和累积分布模型已被用于挖掘风力发电潜力。随后,采用Lysen提出的经验方法计算形状(k,无因次)和尺度(c, m/s)因子等威布尔分布参数。此外,风速特征的变化,即平均风速(vm, m/s)、最大风速(vmax, m/s)、最可能风速(vmp, m/s)、最大携能风速(vme, m/s)已按月、年、季计算。最后,本文将为电力和能源工程师、政策制定者以及在该领域工作的研究人员提供指导性文件,以解决日益扩大的能源供需差距问题。
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引用次数: 5
Assessment of voltage stability of an unbalanced distribution system with Type-3 wind generator 带3型风力发电机的不平衡配电系统电压稳定性评估
T. Datta, A. Sinha, P. Bajpai
Type 3 wind generators like Doubly Fed Induction Generator(DFIG) are capable of providing reactive power support to the connected network. Thus interfacing them to the distribution network effects the voltage stability of the system. In this paper, the effect of the DFIG on an unbalanced distribution network has been evaluated using a voltage stability index calculated from power-flow analysis. The effect of different operating modes of DFIG at different wind speeds and different point of connection to the distribution network have been studied on IEEE standard 34 bus unbalanced distribution system. Effect of voltage regulators, tap limits and DFIG operating limits for unbalanced operation, on the system loadability has also been highlighted in this work.
像双馈感应发电机(DFIG)这样的3型风力发电机能够为连接的网络提供无功支持。因此,将它们连接到配电网会影响系统的电压稳定性。本文利用潮流分析计算的电压稳定指数,评价了DFIG对不平衡配电网的影响。在IEEE标准34总线不平衡配电系统中,研究了DFIG在不同风速和不同接入点下的不同运行方式对配电网的影响。本文还重点研究了不平衡运行时调压器、分接限值和DFIG运行限值对系统负载的影响。
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引用次数: 2
Hybrid adaptive beamforming algorithms for smart antennas 智能天线的混合自适应波束形成算法
Y. Ramakrishna, V Ratna Kumari, P V Subbaiah
The adoption of smart antenna system is a promise to the solutions of the wireless communication impairments like inefficient utilization of frequency spectrum, signal fading due to multipath propagation, etc. The smart antenna works in conjunction with digital signal processor which is responsible to adjust various parameters of the system in order to phase out interference signals and to enhance reception in the desired direction(s). In this paper, an attempt is made to develop various adaptive beamforming algorithms that lead to overall improvement in the performance of the smart antennas. Three complex adaptive beamforming algorithms like Complex Least Mean Squares (CLMS) algorithm, Augmented Complex Least Mean Squares (ACLMS) algorithm, and Adaptive Nonlinear Gradient Descent (ANGD) algorithms are considered for beamforming in smart antennas. Characteristics like Half Power Beam Width (HPBW), Side Lobe Level (SLL) and Mean Square Error (MSE) convergence rate and Tracking the desired signal are considered for the evaluation of performance of the smart array. Three new hybrid algorithms are proposed using the convex hybridization. The hybrid algorithm is formed by the convex combination of any two of the three algorithms in pursuit of performance improvement. The performance of these hybrid algorithms with respect to the important array characteristics is evaluated. It is identified that each of the three hybrids is superior to its individual filters.
智能天线系统的采用是解决无线通信频谱利用率低、多径传播导致的信号衰落等问题的一个希望。智能天线与数字信号处理器配合工作,数字信号处理器负责调整系统的各种参数,以逐步消除干扰信号,并在期望的方向上增强接收。本文试图开发各种自适应波束形成算法,从而全面提高智能天线的性能。研究了三种复杂自适应波束形成算法:复最小均方差(CLMS)算法、增广复最小均方差(ACLMS)算法和自适应非线性梯度下降(ANGD)算法。研究了半功率波束宽度(HPBW)、旁瓣电平(SLL)、均方误差(MSE)收敛速率和期望信号的跟踪等特性,对智能阵列的性能进行了评价。利用凸杂交提出了三种新的混合算法。混合算法是由三种算法中的任意两种算法的凸组合而成,以追求性能的提高。对这些混合算法在重要阵列特性方面的性能进行了评价。结果表明,三种混合滤波器中的每一种都优于其单独的滤波器。
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引用次数: 3
Analysis of modified impedance-network half-bridge converter 改进阻抗-网络半桥变换器分析
Punit Kumar, M. Veerachary
This paper presents a modified Z-network half-bridge converter for applications that requires different kinds of load voltages such as varied positive or negative load voltage and varied time ratio between positive and negative load voltage. Compared to traditional Z-source half-bridge converter, the proposed converter reduces the Z-network capacitor voltage stress remarkably to realize the same load voltage characteristics, with same switch voltage stress. The operating principle, steady-state analysis, small-signal analysis, parameters design and comparison with conventional Z-source half-bridge converter is presented. Simulation results validates the effectiveness of theoretical analysis of proposed converter.
本文提出了一种改进的z网络半桥变换器,适用于各种负载电压的变化,如正、负负载电压的变化以及正、负负载电压的变化时间比。与传统的z源半桥变换器相比,该变换器显著降低了z网络电容器电压应力,实现了相同负载电压特性和相同开关电压应力。介绍了该变换器的工作原理、稳态分析、小信号分析、参数设计以及与传统z源半桥变换器的比较。仿真结果验证了理论分析的有效性。
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引用次数: 4
A review on some aspects of transmission pricing in power system network 电网输电定价若干问题综述
K. Paul, Niranjan Kumar
The onset of restructuring in the power system sector has led to the disintegration of the vertically integrated utility into three different individual entities, generating companies, transmission companies and distribution companies. In order to maintain the market efficiency, the allocation of the transmission cost is very vital. The framework of transmission pricing must be transparent and economical in order to maintain the reliable and efficient operation of the electricity market. A review on the latest era of the transmission pricing has been reported here. The importance of the transmission pricing and the allocation of the transmission cost using nodal pricing method and power flow tracing has also been discussed. This article also reviews the influence of transmission pricing on congestion management, the application of optimization techniques in the transmission cost allocation and the allocation of transmission losses along with a brief overview of the scenario of transmission pricing framework in different countries.
电力系统部门重组的开始导致垂直整合的公用事业分解为三个不同的个体实体:发电公司、输电公司和配电公司。为了保持市场效率,输电成本的分配是至关重要的。输电定价框架必须透明、经济,才能保证电力市场的可靠、高效运行。对最新的输电定价时代进行了回顾。本文还讨论了采用节点定价法和潮流追踪法进行输电定价和输电成本分配的重要性。本文还回顾了输电定价对拥堵管理的影响,优化技术在输电成本分配中的应用以及输电损失的分配,并简要概述了不同国家输电定价框架的情况。
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引用次数: 1
A new approach for line following robot using radius of path curvature and differential drive kinematics 基于路径曲率半径和微分驱动运动学的直线跟踪机器人新方法
Jitendra Singh, Prashant Singh Chouhan
This paper presents a new idea about the development of line following algorithm for a differential drive mobile robot. The paper describes in detail this idea using Geometry to determine the radius of path curvature and based on it the desired difference between angular velocity of two wheels is calculated using Differential drive Kinematics. This robot uses an array of IR reflective sensors to find out the degree to which a circular arc deviates from a straight line. In this scheme a single PID controller is used to control the desired angular velocity for both wheels. To maintain the circular path of desired radius with constant linear velocity, the output of same PID controller is added in left wheel actuator and subtracted from right wheel actuator. Therefore the desired Radius of circular arc is followed by robot.
本文对差动驱动移动机器人的直线跟踪算法的发展提出了一种新的思路。本文详细阐述了用几何方法确定路径曲率半径的思想,并在此基础上用微分传动运动学计算了两轮角速度的期望差。这个机器人使用一组红外反射传感器来找出圆弧偏离直线的程度。在该方案中,使用单个PID控制器来控制两个车轮的期望角速度。在左轮作动器中加入相同PID控制器的输出,在右轮作动器中减去相同PID控制器的输出,以保持期望半径的圆路径,线速度恒定。因此,机器人遵循期望的圆弧半径。
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引用次数: 11
Effect of humidity on leakage current of a contaminated 11 kV Porcelain Pin Insulator 湿度对污染11kv瓷针绝缘子泄漏电流的影响
Suhas Deb, R. Ghosh, S. Dutta, S. Dalai, B. Chatterjee
Porcelain Pin Insulators are one of the most critical components of Power system transmission and distribution arena. Due to environmental degradations these insulators get contaminated. Leakage current starts to flow over the surface of contaminated insulators in presence of humidity, light rain, fog, mist etc. This phenomenon ultimately leads to flashover. To prevent flashover, leakage current measurement of contaminated insulator is very essential. To measure leakage current of a contaminated insulator in presence of humidity of different levels, an experimental set up has been arranged at High Voltage Laboratory of Jadavpur University. From leakage current data and FFT analysis, it will be very helpful for prediction of contamination level of insulators and finally flashover will be averted.
瓷针绝缘子是电力系统输配电领域的关键部件之一。由于环境恶化,这些绝缘体受到污染。在潮湿、小雨、雾、薄雾等环境下,泄漏电流开始流过被污染的绝缘子表面。这种现象最终导致闪络。为防止闪络,对污染绝缘子进行漏电流测量是非常必要的。为了测量不同湿度条件下污染绝缘子的泄漏电流,在印度贾达夫普尔大学高压实验室布置了一套实验装置。从泄漏电流数据和FFT分析中,可以预测绝缘子的污染程度,最终避免闪络的发生。
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引用次数: 7
期刊
2017 6th International Conference on Computer Applications In Electrical Engineering-Recent Advances (CERA)
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