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2016 International Symposium on Industrial Electronics (INDEL)最新文献

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Novel tuning rules for stable dead-time processes with dominant left half-plane zero 具有优势左半平面零的稳定死时过程的新整定规则
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797784
Marko Č. Bošković, T. Šekara, M. Rapaić, Vidan Govedarica
This paper presents a modification of recently reported general rules for designing complex controllers. The presented approach is here applied to control stable processes including dead-time with a dominant left half-plane zero. The introduced modification enables improvements in the form of better disturbance rejection and smaller IAE (Integrated Absolute Error). The solution to design procedure leads to practically realizable controllers. The effectiveness of the proposed method is verified via numerical simulations on several examples resulting into better performance and robustness indices of the closed-loop system compared to recently reported procedure which does not take into consideration the effect of dominant left half-plane zero.
本文对最近报道的设计复杂控制器的一般规则进行了修正。本文将所提出的方法应用于控制具有优势左半平面零的含死时间的稳定过程。引入的修改使改进的形式更好的干扰抑制和更小的IAE(综合绝对误差)。通过对设计过程的求解,得到了可实际实现的控制器。通过数个算例的数值模拟验证了该方法的有效性,结果表明,该方法的性能和鲁棒性指标优于不考虑左半平面零的控制方法。
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引用次数: 3
Recursion based contingency analysis of an electrical power system 基于递归的电力系统偶然性分析
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797797
S. Gusev, V. Oboskalov
Large computational load is one of the key issues of an electrical power system security analysis. Currently, most of the researchers are trying to find out how to reduce the computational load. The contingency analysis is one of the most promising approaches for solving the problem. In fact, there are several ways to improve the effectiveness of the contingency analysis. The first way is to reduce the number of simulated situations via contingency searching or contingency screening. Another way is to increase the efficiency of power flow computations. This paper presents a novel recursion-based approach for solving the contingency analysis problem. The approach improves the effectiveness of the contingency analysis by the above-mentioned ways. It relies on a specific contingency sorting procedure based on the recursive call of the calculating procedure. The proposed approach has been tested on the 14-bus IEEE test system. The results obtained show almost a twofold increase in the computational efficiency in comparison with the conventional contingency sorting procedure.
大计算负荷是电力系统安全分析的关键问题之一。目前,大多数研究人员都在试图找到减少计算负荷的方法。权变分析是解决这一问题最有前途的方法之一。实际上,有几种方法可以提高权变分析的有效性。第一种方法是通过偶然性搜索或偶然性筛选来减少模拟情景的数量。另一种方法是提高潮流计算的效率。本文提出了一种新的基于递归的权变分析方法。该方法提高了上述方法的权变分析的有效性。它依赖于基于计算过程递归调用的特定偶然性排序过程。该方法已在14总线IEEE测试系统上进行了测试。所得结果表明,与传统的偶然性排序过程相比,计算效率几乎提高了两倍。
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引用次数: 4
Finite control set-model predictive control with on-line parameter estimation for variable-speed wind energy conversion systems 变速风能转换系统参数在线估计的有限控制集模型预测控制
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797775
Nico Stati, Mohamed Abdelrahem, Muhammad Hosnee Mobarak, R. Kennel
In this paper, a finite control set-model predictive control (FCS-MPC) scheme with on-line parameter estimation for permanent magnet synchronous generators (PMSGs) based variable-speed wind turbines is proposed. For designing the proposed FCS-MPC, the discrete time model of the PMSG is considered and the future behavior is predicted. Afterward, the switching action that produces the minimum value of a predefined cost function is applied in the next sampling instant. In order to increase the robustness of the proposed FCS-MPC against parameter variations of the PMSG, an extended Kalman filter (EKF) is implemented for estimating the stator resistance and inductance of the PMSG. The performance of the proposed FCS-MPC with on-line parameter estimation is proved via simulation results for all operation conditions.
针对基于永磁同步发电机(PMSGs)的变速风力发电机组,提出了一种参数在线估计的有限控制集模型预测控制(FCS-MPC)方案。在设计FCS-MPC时,考虑了PMSG的离散时间模型,并对其未来行为进行了预测。然后,在下一个采样瞬间应用产生预定义代价函数最小值的开关动作。为了提高FCS-MPC对PMSG参数变化的鲁棒性,实现了扩展卡尔曼滤波(EKF)来估计PMSG的定子电阻和电感。仿真结果证明了该方法在各种工况下的在线参数估计性能。
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引用次数: 9
Impact of steel permeability on ACSR impedance per unit length 钢磁导率对单位长度ACSR阻抗的影响
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797815
K. Kasas-Lazetic, D. Herceg, D. Kljajić, G. Mijatović, M. Prsa
Electric characteristics of Aluminum Conductor Steel Reinforced (ACSR) components, aluminum and steel conductivity values, are usually provided by the ACSR manufacturers, but not the steel core permeability. In order to explore how important the steel core permeability is, the paper deals with the impact of this characteristic on ACSR impedance per unit length. For the estimation of this impact, numerous calculations were performed and the results are shown in this paper. The value of relative steel core permeability was varied from 10 to 50000 inside three different standardized ACSR conductors, at eleven different frequencies, up to 2500 Hz (50th harmonic of fundamental frequency). All calculations were carried out numerically, applying COMSOL Multiphysics 3.5a computer program package on simplified two-dimensional model. ACSR resistance per unit length was calculated from heating losses, while the reactance and the inductance per unit length were determined via magnetic energy stored in ACSR magnetic field. Even in the case of great relative permeability value range, the paper shows that the influence of steel core permeability on any ACS conductor is much less than expected, especially at lower frequencies. This fact is the consequence of the big difference in aluminum and steel conductivity values.
铝导体钢增强(ACSR)组件的电气特性,铝和钢的电导率值,通常由ACSR制造商提供,而不是钢芯的磁导率。为了探究钢芯磁导率的重要性,本文研究了该特性对单位长度ACSR阻抗的影响。为了估计这种影响,进行了大量的计算,并在本文中给出了结果。在三种不同的标准ACSR导体中,在11种不同的频率下,相对钢芯磁导率的值从10到50000不等,最高可达2500 Hz(基频的第50次谐波)。所有计算均采用COMSOL Multiphysics 3.5a计算机程序包对简化的二维模型进行数值计算。单位长度的ACSR电阻由热损耗计算,单位长度的电抗和电感由ACSR磁场中存储的磁能确定。即使在相对磁导率较大的情况下,钢芯磁导率对任何ACS导体的影响都远远小于预期,特别是在较低频率时。这一事实是铝和钢的电导率值差别很大的结果。
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引用次数: 0
Model predictive control for low-voltage ride-through capability improvement of variable-speed wind energy conversion systems 变速风能转换系统低压穿越能力改进的模型预测控制
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797776
Muhammad Hosnee Mobarak, Mohamed Abdelrahem, Nico Stati, R. Kennel
In this paper, a finite control set-model predictive control (FCS-MPC) approach for low-voltage ride-through (LVRT) capability enhancement of permanent magnet synchronous generators (PMSGs) based on variable-speed wind turbines is proposed. According to the FCS-MPC principles, the discrete states of the converter are taken into account and the future converter performance is predicted. Subsequently, the voltage vector that optimizes a predefined cost function is selected to be applied in the next sampling interval. The proposed LVRT method exploits the wind turbine-PMSG rotor inertia to store the surplus power during the grid voltage dips. Simulation results are presented to validate the proposed LVRT strategy for all operation conditions.
提出了一种基于变转速风力发电机的永磁同步发电机(pmsg)低压穿越(LVRT)能力增强的有限控制集模型预测控制(FCS-MPC)方法。根据FCS-MPC原理,考虑了变换器的离散状态,并对变换器的未来性能进行了预测。随后,选择优化预定义代价函数的电压矢量,在下一个采样间隔中应用。提出的LVRT方法利用风力发电机- pmsg转子惯量来存储电网电压下降时的剩余功率。仿真结果验证了LVRT策略在各种工况下的有效性。
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引用次数: 5
Weakly meshed distribution networks with distributed generation — power flow analysis using improved impedance matrix based algorithm 基于改进阻抗矩阵算法的弱网格分布式配电网潮流分析
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797772
Dejan R. Ivic, Drazenko Macanovic, D. Šošić, P. Stefanov
From the viewpoint of the emerging concept of smart grid, distribution network will require fast power flow solution that must be resolved as efficiently as possible. Presence of distributed generators and power electronic based compensating devices, in modern medium and low voltage distribution networks, additionaly expands requirements for performances of algorithms for power flow calculations which are an essential part of effective smart distribution system analysis tools. The solution which can respond to most of defined requirements is proposed in this paper. This paper presents improved algorithm for power flow calculations for radial and weakly meshed distribution network with distributed generation and compensating devices. Proposed algorithm is based on the classical implicit impedance matrix (Zbus) Gauss method. Algorithm, presented in this paper, is enforceable to any one-sided supplied distribution network topology and can calculate the impact of distributed generation from renewable energy sources on electrical power losses and voltage magnitudes. Algorithm is applied to IEEE 33 bus test distribution network, modified by adding tie lines to get meshed network. Efficiency of proposed algorithm is confirmed by calculations for different switching scenarios within analysis of system abilities made to meet requirements for integration of distributed generators in defined system nodes. Described analysis were carried out for both systems, with and without compensation devices included.
从新兴的智能电网概念来看,配电网将需要快速的潮流解决方案,必须尽可能高效地解决。在现代中低压配电网中,分布式发电机和基于电力电子的补偿装置的存在,进一步扩大了潮流计算算法的性能要求,潮流计算算法是有效的智能配电系统分析工具的重要组成部分。本文提出了一种能够满足大多数已定义需求的解决方案。提出了一种具有分布式发电和补偿装置的径向弱网格配电网潮流计算的改进算法。该算法基于经典的隐式阻抗矩阵(Zbus)高斯方法。本文提出的算法适用于任何单侧供电网络拓扑结构,能够计算可再生能源分布式发电对电力损耗和电压幅值的影响。将该算法应用到ieee33总线测试配电网中,通过增加联络线对其进行修改,得到网状网络。通过对不同切换场景的计算,验证了算法的有效性,并对系统能力进行了分析,以满足分布式发电机在定义的系统节点中的集成要求。对两个系统进行了描述分析,包括补偿装置和不包括补偿装置。
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引用次数: 6
The system of node load models in the problem of electrical power production planning 系统的节点负荷模型在电力生产计划问题中的应用
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797789
E. A. Plesnyaev, A. Berdin, P. Kryuchkov, P. A. Kuzin, P. Kovalenko
The problem of the power consumption forecast calculation is solved for all time intervals with the subsequent increase in the accuracy while the prediction intervals are decreasing. The lack of complete information on all types of node loads of the controlled power system makes it necessary to solve the problem of their determination. The composition of the nodes and methods of loads modelling are determined by the equivalent circuit of the power grid applied. A System of Node Load Models that provides a solution of the whole complex of forecasting problems on the basis of a common methodological basis, using nonlinear additive models is proposed in the paper.
解决了所有时间区间的功耗预测计算问题,随着预测区间的减小,精度不断提高。由于受控电力系统中各类节点负荷缺乏完整的信息,需要解决节点负荷的确定问题。节点的组成和负荷建模方法由所应用的电网等效电路决定。本文提出了一个节点负荷模型系统,该系统使用非线性加性模型,在通用的方法基础上解决了整个复杂的预测问题。
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引用次数: 1
Discretization of optical properties in symmetrical nanofilm-structures 对称纳米膜结构中光学性质的离散化
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797774
Danijela Vuković, S. Vučenović, J. Šetrajčić, D. Rodić
Based on microscopic (exciton) theory of optical properties of symmetrically perturbed ultrathin molecular films, the absorption, reflection and transparency indices were formulated and presented in the function of frequencies of external electromagnetic field in near infrared (IR) region. It has been showed that all optical properties depend on the position of the crystal plane with regard on boundary planes of the film. We have determined and analyzed optical properties relations for the whole film structure based on the consideration for multiple reflection, absorption and transparency in those multilayered structure. The three-layered dielectric nanofilms with different boundary conditions on surfaces were analyzed and some discrete resonant absorption lines were obtained. Their number, position and distribution depend on the boundary parameter values, i.e. on the type and the technological process of their preparation/fabrication. Practically monochromatic absorption may occur. Unlike the corresponding bulk-samples which are total absorbers throughout the near IR region, in ultrathin films will appear selective and discrete reflection and transparency too. These results could give a great contribution in optical engineering of nanostructures, especially in technology of designing of new electronic and photonic equipment, and for nanoparticles construction for drug carrier/delivery in nano-medicine.
基于对称摄动超薄分子膜光学性质的微观(激子)理论,给出了薄膜的吸收、反射和透明指数与外电磁场近红外频率的函数关系。结果表明,所有的光学性质都取决于晶体面相对于薄膜边界面的位置。在考虑多层结构的多次反射、吸收和透明度的基础上,确定并分析了整个薄膜结构的光学性质关系。对具有不同表面边界条件的三层介质纳米膜进行了分析,得到了一些离散共振吸收谱线。它们的数量、位置和分布取决于边界参数值,即取决于它们的制备/制造的类型和工艺过程。实际上可能发生单色吸收。不同于相应的大块样品在整个近红外区域都是完全吸收剂,在超薄膜中也会出现选择性和离散反射和透明度。这些结果对纳米结构的光学工程,特别是新型电子和光子设备的设计技术,以及纳米医学中用于药物载体/递送的纳米颗粒的构建具有重要的贡献。
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引用次数: 2
The flexible algorithm for identifying a disturbance and transient duration in power systems 电力系统扰动和暂态持续时间辨识的柔性算法
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797787
P. Kovalenko, A. Berdin, D. Bliznyuk, E. A. Plesnyaev
The problem of identifying a disturbance and transient duration in power systems at the appropriate time is crucial. The necessity of an early disturbance detection is driven by the essential aims of dispatching control and automatic emergency control systems, both local and centralized. The paper proposes a flexible algorithm for identifying a disturbance and transient duration, based on the "hinge joint" technique: the initial data interval is fitted iteratively by two linear sections connected one after another. The key element of the algorithm is tracking the difference between the sections' angles of descent. Applying the technique allows to detect the point where the signal changes rapidly and significantly, which indicates the transient start. The significant changes in the state parameters behavior may be driven by a power imbalance when power signals are considered or by other emergencies along with relay protection and automatic control systems actions. The primary aim of the algorithm is to identify the disturbance with the highest possible accuracy in terms of time based on the power system state parameters measurements. The algorithm is applied to processing both Wide-Area Monitoring System (WAMS) data of the sampling rate corresponding to the rated network frequency (obtained from Phasor Measurement Units - PMUs) and instantaneous state parameters measurements (obtained from Digital Fault Recorders - DFRs) as well. The algorithm is validated involving physical simulation results along with the actual WAMS data collected from power system entities. The algorithm processing speed is sufficient to ensure operation on a real time basis.
在适当的时间识别电力系统中的扰动和暂态持续时间是一个至关重要的问题。早期干扰检测的必要性是由调度控制和自动应急控制系统的基本目标驱动的,无论是地方性的还是集中式的。本文提出了一种基于“铰节点”技术的扰动和暂态持续时间辨识的灵活算法:用两个连续的线性段迭代拟合初始数据区间。该算法的关键要素是跟踪剖面下降角之间的差异。应用该技术可以检测信号变化迅速和显著的点,这表明瞬态启动。当考虑功率信号时,状态参数行为的重大变化可能由功率不平衡或其他紧急情况以及继电保护和自动控制系统的动作驱动。该算法的主要目的是在电力系统状态参数测量的基础上,以尽可能高的时间精度识别干扰。该算法应用于处理广域监测系统(WAMS)中对应于额定网络频率的采样率数据(来自相量测量单元pmu)和瞬时状态参数测量数据(来自数字故障记录仪DFRs)。利用物理仿真结果和从电力系统实体采集的WAMS实际数据对算法进行了验证。算法的处理速度足以保证操作的实时性。
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引用次数: 5
Segmentation-based compound figure detection and separation methods 基于分割的复合图检测与分离方法
Pub Date : 2016-11-01 DOI: 10.1109/INDEL.2016.7797794
Igor Sevo, Tijana Mijatovic
Figure detection, separation and image classification are common problems occurring in various fields, especially medicine. Since image databases are usually large, manual classification would be a demanding task. In this paper, we proposed a method for automatic compound figure detection and separation, and gave a comparison between other recognition methods, such as convolutional neural networks. The proposed method is based on differentiating objects in the image, and merging object artifacts with the nearest large object. Parameters of size and distance were varied, and different criteria for determining the object boundaries were tested. Using this method, an accuracy of 90.20% was achieved on a test set of 500 images, with an average processing time less than 600ms per image for the given combination of parameters.
图像检测、分离和图像分类是各个领域中常见的问题,尤其是医学领域。由于图像数据库通常很大,因此手动分类将是一项要求很高的任务。本文提出了一种自动检测和分离复合图形的方法,并与卷积神经网络等其他识别方法进行了比较。该方法基于区分图像中的目标,并将目标伪影与最近的大目标合并。改变了大小和距离参数,并测试了确定目标边界的不同准则。使用该方法,在500张图像的测试集上,准确率达到90.20%,在给定参数组合下,每张图像的平均处理时间小于600ms。
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引用次数: 0
期刊
2016 International Symposium on Industrial Electronics (INDEL)
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