European Transactions on Electrical Power最新文献

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Development of a fuzzy rule based generalized unified power flow controller 基于模糊规则的广义统一潮流控制器的研制

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.250

J. Singh, P. Tripathy, S. Singh, S. Srivastava

Rapid development of high power semiconductor devices with fast control features have given birth to several flexible AC transmission systems (FACTS) controllers to improve the power system performance. One of the advanced FACTS controllers is generalized unified power flow controller (GUPFC) or multi-converter UPFC, which can control bus voltage and both the real and reactive power flows of more than one line or even a sub-network. In this paper, dynamic performance of a GUPFC has been investigated using a new fuzzy logic based controller. The controller rules have been structured depending upon the relationship between the series inserted voltages in multi-line and the desired changes of real/reactive power flows in the power system. The effects of different types of controllers along with parameters of series transformers and transmission lines have been investigated through the control block models developed on a sample system in MATLAB SIMULINK. The effectiveness of the proposed scheme has been demonstrated through various case studies. Copyright © 2008 John Wiley & Sons, Ltd.

具有快速控制特性的大功率半导体器件的快速发展催生了多种灵活的交流传输系统(FACTS)控制器，以提高电力系统的性能。通用统一潮流控制器(GUPFC)或多变换器UPFC是一种先进的FACTS控制器，它可以控制母线电压以及多条线路甚至一个子网络的实潮流和无功潮流。本文采用一种新的基于模糊逻辑的控制器研究了GUPFC的动态性能。根据多线路中串联插入电压与电力系统中实际/无功潮流的期望变化之间的关系，构建了控制器规则。通过MATLAB SIMULINK开发的控制块模型，研究了不同类型的控制器对串联变压器和输电线路参数的影响。建议方案的有效性已通过多个个案研究得到证实。版权所有©2008 John Wiley & Sons, Ltd

引用次数: 19

The assessment of the impacts of the security management in a competitive environment 安全管理在竞争环境中的影响评估

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.246

E. Bompard, E. Carpaneto, G. Ciwei, R. Napoli, G. Demartini, G. Vimercati

Security management is of the utmost importance in power system and many efforts have been made on this issue since a reliable supply of electricity is crucial to the modern societies. The traditional approach adopted in Europe is based on the “n − 1” steady-state security that is efficient, although restrictive, and can continue to play an important role also in the new competitive context. In this paper, three alternative market-based models for security consideration are introduced, according to preventive and corrective control approaches. The models are presented and analyzed in terms of their economic impacts on the market throughout a set of useful indexes that allows for a ranking of the advantages got from the re-enforcement of the lines. Moreover, the positive impacts of the phase-shifter (PS) installation for the security and congestion management are quantified and indexes are derived to assess their optimal location. The different models and the exploitation of the proposed indexes are illustrated with reference to a 34-bus test system. Copyright © 2008 John Wiley & Sons, Ltd.

在电力系统中，安全管理是至关重要的，由于可靠的电力供应对现代社会至关重要，人们在这一问题上做了许多努力。欧洲采用的传统方法是基于“n−1”稳态安全，这种安全虽然有限制，但很有效，并且可以在新的竞争环境中继续发挥重要作用。本文根据预防和纠正控制方法，介绍了三种可供选择的基于市场的安全考虑模型。通过一组有用的指数，对这些模型对市场的经济影响进行了介绍和分析，这些指数允许对重新实施这些线路所获得的优势进行排名。此外，还量化了移相器(PS)安装对安全和拥塞管理的积极影响，并导出了评估其最优位置的指标。以34总线测试系统为例，说明了不同的模型和指标的实现。版权所有©2008 John Wiley & Sons, Ltd

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引用次数: 0

Non-superconducting fault current limiters 非超导故障限流器

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.247

M. T. Hagh, M. Abapour

This paper proposes the use of non-superconducting DC reactor type fault current limiter (NSFCL) instead of superconducting fault current limiters (SFCLs) which has high cost and technology. Proposed FCL consists of three similar sets, each including a diode bridge and a single non-superconducting DC reactor. The device is connected in series with distribution line and it has almost no effect on the normal system operation. It is not necessary to use a control circuit and it has a simple and cheap power circuit. Design characteristics, analytical analysis and overall transient and steady-state performance of NSFCL in normal and fault conditions are presented in this paper. The comparison between experimental and simulation results indicate good agreements. The results confirm that the power loss of NSFCL is a very small percentage of distribution line power. Also, the system current and load voltage distortions due to using NSFCL is explained and simulated. Copyright © 2008 John Wiley & Sons, Ltd.

本文提出用非超导直流电抗器型故障限流器(NSFCL)代替成本高、技术含量高的超导故障限流器(sfcl)。提议的FCL由三个类似的组件组成，每个组件包括一个二极管桥和一个非超导直流电抗器。该装置与配电线路串联，对系统的正常运行几乎没有影响。它不需要使用控制电路，并且具有简单廉价的电源电路。本文介绍了NSFCL的设计特点、解析分析以及在正常和故障工况下的总体暂态和稳态性能。仿真结果与实验结果吻合较好。结果表明，NSFCL的功率损耗占配电线路功率的比例很小。此外，还对NSFCL引起的系统电流和负载电压畸变进行了解释和仿真。版权所有©2008 John Wiley & Sons, Ltd

引用次数: 34

Considering safety issues in minimum losses reconfiguration for MV distribution networks 考虑中压配电网最小损耗重构中的安全问题

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.244

A. Campoccia, E. R. Sanseverino, G. Zizzo

This paper offers a new perspective over the traditional problem of the multiobjective optimal reconfiguration of electrical distribution systems in regular working state. The issue is indeed here formulated including also safety issues. Indeed, dimensioning the earth electrodes of their own secondary substations, distribution companies take into account the probable future configurations of the network due to transformations of overhead lines into cable lines or realization of new lines. On the contrary, they do not consider that, during normal working conditions, the structure of the network can be modified for long periods as a consequence of reconfiguration manoeuvres, with differences between the design current of the earthing systems and the fault current in certain substations significant. As a consequence, often distribution companies limit the implementation of the optimal reconfiguration layouts because they are unable to suitably evaluate the safety issue. In the paper, the problem is formulated including a further objective in order to account for the safety. A suitable constrained multiobjective formulation of the reconfiguration problem is therefore used aiming at: the minimal power losses operation, the verification of safety at distribution substations, the load balancing among the HV/MV transformers while keeping the voltage profile regular. The application carried out uses an NSGA-II algorithm whose performance is compared to that of a fuzzy logic-based multiobjective evolutionary algorithm. In the considered automated network, the remote control of tie-switches is possible and their layout is the optimization variable. After a brief description of the optimal reconfiguration problem for automated distribution networks, the most recent papers on the topic are reported and commented. Then the problem formulation and the solution algorithm are described in detail. Finally, test results on a large MV distribution network are reported and discussed. Copyright © 2008 John Wiley & Sons, Ltd.

本文对传统的配电系统在正常工作状态下的多目标优化配置问题提供了一个新的视角。这里的问题包括安全问题。事实上，配电公司在为自己的二次变电站的接地电极制定尺寸时，考虑到由于架空线路转换为电缆线路或实现新线路而可能出现的未来网络配置。相反，他们没有考虑到，在正常工作条件下，由于重新配置操作，接地系统的设计电流与某些变电站的故障电流之间的差异很大，因此网络的结构可以长期修改。因此，分销公司往往因为无法适当地评估安全问题而限制了最优重新配置布局的实施。在本文中，问题的制定包括一个进一步的目标，以说明安全。因此，采用了一种合适的约束多目标重构问题的表述，主要针对:运行损耗最小、变电站安全验证、高压/中压变压器之间的负载均衡以及保持电压分布规律。该应用使用了NSGA-II算法，并将其性能与基于模糊逻辑的多目标进化算法进行了比较。在考虑的自动化网络中，连接开关的远程控制是可能的，其布局是优化变量。在简要介绍了自动化配电网的最优重构问题之后，对这一主题的最新论文进行了报道和评论。然后详细描述了问题的表述和求解算法。最后，对大型中压配电网的测试结果进行了报道和讨论。版权所有©2008 John Wiley & Sons, Ltd

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引用次数: 10

Call for Papers: Special Issue on Power System Phasor Measurement Data and Their Applications 《电力系统相量测量数据及其应用》特刊征文

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.367

J. Chow

引用次数: 0

Temperature distribution in ONAN power transformer windings with finite element method 用有限元法研究了ONAN电力变压器绕组的温度分布

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.251

M. Taghikhani, A. Gholami

Since large power transformers belong to the most valuable assets in electrical power networks, it is suitable to pay higher attention to these operating resources. Thermal impact leads not only to long-term oil/paper-insulation degradation; it is also a limiting factor for the transformer operation. Therefore, the knowledge of the temperature, especially the hot-spot temperature (HST), is of high interest. The calculation of current thermal stress helps to avoid unexpected outages. This paper presents the temperature distribution in windings of the oil power transformers. In this paper, energy (thermal) equation is solved until temperature is obtained. Oil in the transformer is assumed nearly incompressible and oil parameters such as thermal conductivity, special heat, viscosity, and density vary with temperature. For numerical solution of above equation, finite element method is used. The selected models for simulation are 300 KVA and 22.5 MVA ONAN transformers. Copyright © 2008 John Wiley & Sons, Ltd.

由于大型电力变压器属于电网中最宝贵的资产，因此对这些运行资源给予较高的重视是合适的。热冲击不仅导致油/纸绝缘长期退化;它也是变压器运行的一个限制因素。因此，了解温度，特别是热点温度(HST)是非常重要的。当前热应力的计算有助于避免意外停机。本文介绍了油变压器绕组内的温度分布。本文求解能量(热)方程，直至得到温度。假定变压器中的油几乎不可压缩，并且油的导热系数、特热、粘度和密度等参数随温度而变化。采用有限元法对上述方程进行数值求解。选择300 KVA和22.5 MVA的ONAN变压器进行仿真。版权所有©2008 John Wiley & Sons, Ltd

引用次数: 14

Loss prediction in switched reluctance motors using finite element method 基于有限元法的开关磁阻电机损耗预测

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.252

J. Faiz, B. Ganji, C. Carstensen, R. D. Doncker

In the present paper, a core loss model for switched reluctance motor (SRM) is developed using ANSYS finite element package. In this model, the flux waveform in one part of the magnetic circuit of the motor is predicted by analysis of the motor with finite element method (FEM), and then the flux waveforms in other sections of the motor are determined using this predicted flux waveform. To validate the obtained flux waveforms, they are compared with those predicted solely by analysis of the motor with FEM. Since the flux waveforms are completely non-sinusoidal, three different methods based on the Steinmetz equation are utilized to estimate the core loss, and the estimated loss are compared with measured data. For the measurement, an experimental set-up is introduced and various aspects of the core loss measurement of SRM are discussed. Copyright © 2008 John Wiley & Sons, Ltd.

本文利用ANSYS有限元软件建立了开关磁阻电动机的铁心损耗模型。该模型采用有限元法对电机进行分析，预测电机部分磁路的磁通波形，然后利用预测的磁通波形确定电机其他部分的磁通波形。为了验证所得到的磁链波形，并将其与仅通过有限元分析预测的磁链波形进行了比较。由于磁通波形完全是非正弦的，采用基于Steinmetz方程的三种不同方法估计铁芯损耗，并将估计损耗与实测数据进行比较。为了测量，介绍了实验装置，并讨论了SRM铁芯损耗测量的各个方面。版权所有©2008 John Wiley & Sons, Ltd

引用次数: 28

The role of Poynting's vector in polyphase power calculations 波印亭矢量在多相功率计算中的作用

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.248

J. Faria

This paper is a tutorial contribution to the clarification of the role played by Poynting's vector (PV) in power calculations. In polyphase power systems, the standard computation of the instantaneous power is usually performed by using a summation of voltage–current products. We show analytically how such a result can be deduced directly from Maxwell's equations together with the evaluation of the PV flux. A simple application example is provided to illustrate the issue under discussion. Copyright © 2008 John Wiley & Sons, Ltd.

引用次数: 6

Localization of winding radial deformation and determination of deformation extent using vector fitting‐based estimated transfer function 利用基于矢量拟合的估计传递函数定位绕组径向变形并确定变形程度

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.253

P. Karimifard, G. Gharehpetian, S. Tenbohlen

This paper suggests a new method to detect the location and the extent of the winding buckling which is based on the transfer function (TF) estimation using the vector fitting (VF) method. To study the proposed method, the verified detailed model of the transformer winding in the frequency range of kHz < f < MHz has been developed. The simulation results indicate the capability of the proposed method to localize the deformed section in the transformer winding. In addition, the proposed method presents an index for the determination of the deformation extent. Copyright © 2008 John Wiley & Sons, Ltd.

引用次数: 39

Evaluation aging failure probability of generating units using data analytic method 用数据分析法评估发电机组老化失效概率

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.243

Seung Hyuk Lee, I. Bae, Jin-O. Kim, Sung Hoon Lee

This paper presents a method to predict failure probability related to the aging of generating units in power systems. To calculate aging failure probability, Weibull distribution is usually used due to age-related reliability. The shape and scale parameters of Weibull distribution can be estimated by using hybrid method using both normal and Weibull distributions. In this paper, data analytic method applied to type II censoring is proposed which is relatively simpler and faster than the hybrid method for the estimation of parameters. The real historical data of combustion turbine generating units in Korean power systems are used in the case study to show how to calculate the mean life and its standard deviation by the proposed method. Copyright © 2008 John Wiley & Sons, Ltd.

提出了一种预测电力系统中与机组老化有关的故障概率的方法。在计算老化失效概率时，由于与年龄相关的可靠性，通常采用威布尔分布。利用正态分布和威布尔分布的混合方法可以估计威布尔分布的形状和尺度参数。本文提出了一种应用于II型滤波的数据分析方法，该方法相对于混合参数估计方法更为简单和快速。以韩国电力系统中燃烧汽轮发电机组的真实历史数据为例，说明了如何利用所提出的方法计算平均寿命及其标准差。版权所有©2008 John Wiley & Sons, Ltd

引用次数: 2

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