European Transactions on Electrical Power最新文献

英文中文

Power system performance quality indices 电力系统性能质量指标

European Transactions on Electrical Power

Pub Date : 2011-07-01 DOI: 10.1002/ETEP.515

B. Alshammari, M. El-Kady, Y. Al-Turki

The paper summarizes the results of a recent industry supported research and development study in which a novel framework for evaluating meaningful power system reliability and quality indices was developed and applied. The system-wide integrated performance indices are capable of addressing and revealing areas of deficiencies and bottle-necks as well as redundancies in the composite generation–transmission–demand structure of large-scale power grids. The novel technique utilizes a basic linear programming formulation, which offers a general and comprehensive framework to assess the harmony and compatibility of generation, transmission, and demand in a power system. Practical application to a portion of the Saudi power grid is also presented in the paper for demonstration purposes. Copyright © 2010 John Wiley & Sons, Ltd.

本文总结了最近一项工业支持的研究和开发研究的结果，该研究开发并应用了一个新的框架来评估有意义的电力系统可靠性和质量指标。全系统综合性能指标能够解决和揭示大型电网发电-输电-需求复合结构中的缺陷和瓶颈以及冗余问题。该新技术利用基本的线性规划公式，提供了一个通用的、全面的框架来评估电力系统中发电、输电和需求的和谐与兼容性。本文还介绍了在沙特部分电网中的实际应用，以作示范。版权所有©2010 John Wiley & Sons, Ltd

引用次数: 14

Methods to improve transient performance of CVTs: analysis and recommendations 提高cvt暂态性能的方法:分析与建议

European Transactions on Electrical Power

Pub Date : 2011-07-01 DOI: 10.1002/ETEP.512

A. Khanna

Transients in capacitive voltage transformers (CVTs) are known to cause measurement problems in the relays. These switching transients can take several cycles to die out if the burden imposed by the secondary connected devices is a fraction of the CVT rated burden. In this paper, the transient response of the CVTs connected to low burden numerical relays is studied in detail and than the methods to improve the same are discussed. The methods discussed vary from simple modifications in existing CVT design to some major changes in the CVT construction. The paper gives a comprehensive coverage of design issues for CVTs intended to be used with numerical relays. Copyright © 2010 John Wiley & Sons, Ltd.

电容式电压互感器(cvt)的瞬变会导致继电器的测量问题。如果次级连接设备施加的负荷是CVT额定负荷的一小部分，这些开关瞬态可能需要几个周期才能消失。本文详细研究了与低负荷数值继电器连接的cvt的暂态响应，并讨论了改善其暂态响应的方法。讨论的方法从对现有无级变速器设计的简单修改到对无级变速器结构的一些重大改变。本文给出了一个全面的覆盖设计问题的cvt打算与数字继电器使用。版权所有©2010 John Wiley & Sons, Ltd

引用次数: 1

Influence of Steinmetz circuit capacitor degradation on series resonance of networks Steinmetz电路电容退化对网络串联谐振的影响

European Transactions on Electrical Power

Pub Date : 2011-07-01 DOI: 10.1002/ETEP.514

L. Sainz, Manuel Caro, E. Caro

The Steinmetz circuit is used in AC traction systems to balance consumed currents. In these systems, locating resonances between Steinmetz circuit capacitors and system inductors avoids harmonic problems. In particular, the paper locates analytically the series resonance “observed” from the supply system considering the influence of capacitor degradation with respect to its design value. The study of this resonance is important to avoid problems associated with background voltage distortion. The analytical results are validated with experimental measurements. Copyright © 2010 John Wiley & Sons, Ltd.

引用次数: 2

Use of Prony analysis to extract sync information of low frequency oscillation from measured data 利用proony分析从实测数据中提取低频振荡的同步信息

European Transactions on Electrical Power

Pub Date : 2011-07-01 DOI: 10.1002/ETEP.531

K. Shim, H. Nam, Y. Lim

This paper describes methods to search the sync that takes place in power systems. Discrete signals in power systems can be expressed by the sum of several damped exponential sine functions. Therefore, dominant mode and residues included in the signals are estimated by applying parameter estimation methods. They are compared in their search for the sync among output signals. In the dominant oscillation mode included in many signals, the modes that have similar frequencies and damping constants were selected. By comparing their residues and phases, the sync of low frequency oscillations was examined. By identifying the sync of wide area oscillations, it was possible to differentiate between the generator and load characteristics. The sync exploring method proposed in this paper, together with sync indexes, were applied to a two area system and the KEPCO system to confirm that it is possible to search for the sync phenomenon in signals of large scale power systems. Copyright © 2010 John Wiley & Sons, Ltd.

本文介绍了在电力系统中搜索同步的方法。电力系统中的离散信号可以用几个阻尼指数正弦函数的和来表示。因此，采用参数估计方法估计信号中的主导模态和残数。它们在搜索输出信号之间的同步时进行比较。在许多信号中包含的主导振荡模态中，选择具有相似频率和阻尼常数的模态。通过对其残差和相位的比较，验证了其低频振荡的同步性。通过识别广域振荡的同步，可以区分发电机和负载特性。将本文提出的同步探索方法与同步指标一起应用于两区系统和韩国电力系统，验证了在大型电力系统信号中搜索同步现象的可能性。版权所有©2010 John Wiley & Sons, Ltd

引用次数: 22

Application of BDI-based intelligent multi-agent systems for distribution system service restoration planning 基于bdi的智能多智能体系统在配电系统服务恢复规划中的应用

European Transactions on Electrical Power

Pub Date : 2011-07-01 DOI: 10.1002/ETEP.542

M. Tsai, Yen-Tsung Pan

By changing the status of switches on distribution feeders, service to de-energized customers can be restored after an occurrence of a fault. In this paper, multi-agent system (MAS) is applied for the power distribution system service restoration task using local information by utilizing the characteristics of information sharing. Each software agent is running autonomously and is able to exchange information within limited distance. Every agent is capable of performing service restoration such that service restoration can be performed in parallel when a multiple fault scenario occurs. As a result, the outage period can be reduced. BDI (believe–desire–intention) agent architecture is implemented in this paper for group and zone service restoration for power distribution systems. Zone/switch relation table is built and used by agents in order to identify adequate switching actions during the service restoration planning stage. The proposed MAS is implemented on JADE (Java Agent Development) platform. The simulation results show that the proposed BDI-based service restoration agent system is capable of providing adequate restoration switching plan in several scenarios. Copyright © 2010 John Wiley & Sons, Ltd.

通过改变配电馈线上开关的状态，可以在故障发生后恢复对断电客户的服务。本文利用信息共享的特点，将多智能体系统(MAS)应用于利用本地信息的配电系统服务恢复任务。每个软件代理都是自主运行的，能够在有限的距离内交换信息。每个代理都能够执行业务恢复，以便在发生多故障场景时并行执行业务恢复。因此，可以缩短停机时间。本文将BDI (believe-desire-intention)智能体架构应用于配电系统的群组和区域业务恢复。为了在业务恢复计划阶段确定适当的切换动作，代理建立和使用Zone/switch关系表。所提出的MAS在JADE (Java Agent Development)平台上实现。仿真结果表明，所提出的基于bdi的业务恢复代理系统能够在多种场景下提供充分的恢复切换计划。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 30

Efficient immune-GA method for DNOs in sizing and placement of distributed generation units 基于免疫遗传算法的分布式发电机组优化设计

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.501

Alireza Soroudi, M. Ehsan

This paper proposes a hybrid heuristic optimization method based on genetic algorithm and immune systems to maximize the benefits of Distribution Network Operators (DNOs) accrued due to sizing and placement of Distributed Generation (DG) units in distribution networks. The effects of DG units in reducing the reinforcement costs and active power losses of distribution network have been investigated. In the presented method, the integration of DG units in distribution network is done considering both technical and economical aspects. The strength of the proposed method is evaluated by applying it on a small and a realistic large scale distribution network and the results are compared with analytical classic and other heuristic methods and discussed. Copyright © 2010 John Wiley & Sons, Ltd.

本文提出了一种基于遗传算法和免疫系统的混合启发式优化方法，以最大限度地提高配电网中分布式发电机组的规模和布局所带来的配电网运营商的收益。研究了分布式发电机组在降低配电网加固费用和有功损耗方面的作用。该方法从技术和经济两个方面考虑配电网中DG机组的集成问题。将该方法应用于小型配电网和实际大型配电网，对其强度进行了评价，并与经典解析法和其他启发式方法进行了比较和讨论。版权所有©2010 John Wiley & Sons, Ltd

引用次数: 33

Emission allowance allocation with multiple equity principles in deregulated power systems 放松管制电力系统中多重公平原则的排放配额分配

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.509

J. Xie, J. Zhong, D. Gan

Equity is an essential issue to consider in emission allowance allocation problems to ensure the participation of as many market participants as possible. Various equity principles have been practiced in emission allowance allocations, and some of them conflict. The main purpose of this work is to present an emission allowance allocation methodology that takes into account both individual interests and different versions of equity and makes progress toward reaching a global consensus for emission allowance allocation in deregulated power systems. We propose nine equity principles for emission allowance allocation. We combine a hierarchical system with a voting mechanism to incorporate various definitions of equity and to find a compromise solution. The voting mechanism is used for selecting equity principles for each power plant (market participant). The hierarchical system is composed of two subsystems. The upper level subsystem computes the emission allowances among all regions, while the lower level subsystem obtains the emission allowances among the power plants in each region. A test power system serves to illustrate the essential features of the proposed methodology, and the results are used to investigate the choice of equity principles of different types of power plants located in different regions. Copyright © 2010 John Wiley & Sons, Ltd.

公平是排放配额分配问题中必须考虑的重要问题，以确保尽可能多的市场参与者参与。在排放配额分配中，各种公平原则得到了实践，有些原则相互冲突。这项工作的主要目的是提出一种排放配额分配方法，该方法既考虑到个人利益，也考虑到不同版本的公平，并朝着在放松管制的电力系统中就排放配额分配达成全球共识取得进展。我们提出了九项公平分配原则。我们将等级制度与投票机制结合起来，以纳入对公平的各种定义，并找到一个折衷的解决方案。投票机制用于为每个发电厂(市场参与者)选择公平原则。该分级系统由两个子系统组成。上层子系统计算各区域间的排放允许量，下层子系统计算各区域内电厂间的排放允许量。一个试验电力系统用来说明所提出的方法的基本特征，并使用结果来研究不同地区不同类型发电厂公平原则的选择。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 2

Dynamic economic dispatch solution using an improved genetic algorithm with non‐stationary penalty functions 基于非平稳惩罚函数的改进遗传算法求解动态经济调度

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.520

S. Ganjefar, Morteza Tofighi

This paper presents an improved genetic algorithm with non-stationary penalty functions (IGA-NSPF) to solve the dynamic economic dispatch (DED) problem of generating units while considering valve-point effects. The cost function of the generating units exhibits the non-convex characteristics, as the valve-point effects are modeled and imposed as rectified sinusoid components in the cost function. An improved evolution direction operator and gene swap operator are introduced in the proposed approach to improve the convergence characteristic of the genetic algorithm (GA). The non-stationary penalty functions (NSPF) are introduced to put more selective pressure on the GA to find a feasible solution, resulting in difficulty during solution searching. The non-stationary penalty is a function of the number of iterations that, in the proposed method, are based on a sigmoid function as the number of iteration increases so does the penalty. To illustrate the effectiveness of the proposed method, a dispatch case consisting of 10 units and 24 time intervals has been considered. Numerical results indicate that the performance of the IGA-NSPF presents the best results when compared with previous optimization methods in solving DED problems with the valve-point effect. Copyright © 2010 John Wiley & Sons, Ltd.

针对考虑阀点效应的机组动态经济调度问题，提出了一种改进的非平稳惩罚函数遗传算法(IGA-NSPF)。发电机组的成本函数表现出非凸特性，因为阀点效应被建模并作为成本函数中的整流正弦波分量施加。该方法引入了改进的进化方向算子和基因交换算子，提高了遗传算法的收敛性。引入非平稳惩罚函数(non-stationary penalty function, NSPF)对遗传算法施加更大的选择压力，使其难以找到可行解。非平稳惩罚是迭代次数的函数，在提出的方法中，迭代次数是基于s型函数的，随着迭代次数的增加，惩罚也会增加。为了说明所提方法的有效性，我们考虑了一个由10个单元和24个时间间隔组成的调度案例。数值结果表明，IGA-NSPF算法在求解具有阀点效应的DED问题时，与以往的优化方法相比，具有最佳的性能。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 28

A runs test‐based method for discrimination between internal faults and inrush currents in power transformers 一种基于运行试验的电力变压器内部故障和涌流鉴别方法

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.506

B. Fani, M. Golshan, H. Abyaneh, M. Saghaian-nejad

A new method based on runs test is proposed to distinguish the inrush currents from the internal faults in power transformers, which is derived from the inherent differences between these waveforms. First, two statistical hypotheses that represent these differences are defined. Then by testing these hypotheses using runs test and by comparing the outputs of the hypotheses, a criterion to identify the internal fault is obtained. A total of 200 experimental cases are used to test the performance of the technique. In all of the tests, the proposed method accurately distinguished between fault and inrush currents without any errors. Also the suitable performance of the method is demonstrated by simulation of different faults and switching conditions on a power transformer. For this purpose, a small part of Iran power system involving a power transformer and the transmission lines on both sides of the transformer has been considered. To include effective factors on differential current components, the elements of this power system have been precisely modeled in PSCAD/EMTDC. Copyright © 2010 John Wiley & Sons, Ltd.

根据励磁涌流波形与励磁涌流波形之间的内在差异，提出了一种基于运行试验的励磁涌流与励磁涌流波形鉴别方法。首先，定义了代表这些差异的两个统计假设。然后通过运行测试对这些假设进行检验，并通过比较假设的输出，得到一个识别内部故障的准则。通过200个实验实例验证了该技术的性能。在所有的测试中，该方法准确地区分了故障电流和涌流，没有任何误差。通过对电力变压器不同故障和开关状态的仿真，验证了该方法的有效性。为此，考虑了伊朗电力系统中涉及电力变压器和变压器两侧输电线路的一小部分。为了包括差分电流分量的有效因素，该电力系统的元件已在PSCAD/EMTDC中精确建模。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 5

A multivariate forecasting method for short-term load using chaotic features and RBF neural network 基于混沌特征和RBF神经网络的短期负荷多元预测方法

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.502

Yuming Liu, Shaolan Lei, Caixin Sun, Quan Zhou, Haijun Ren

This paper presents a multivariate forecasting method for electric short-term load using chaos theory and radial basis function (RBF) neural networks. To apply the method, the largest Lyapunov exponent and correlation dimension are firstly calculated which show the electric load series is essentially a chaotic time series. Then, a multivariate chaotic prediction method is proposed taking historical load and temperature into account. Phase space reconstruction of a univariate time series is extended to construct a multivariate time series. Delay time and embedding dimension of the historical load series and temperature series are determined by mutual information and minimal forecasting error, respectively. Finally, a three-layer RBF neural network is employed to forecast the load of one day ahead and one week ahead. Real load data of Chongqing Power Grid are tested. Daily and weekly forecasting results show that the proposed multivariate approach improves the accuracy of forecasting significantly comparing with the univariate methods. Discussion of forecasting error and future work are also presented. As an efficient and effective alternative for STLF, the chaos theory based multivariate forecasting is feasible for potential application. Copyright © 2010 John Wiley & Sons, Ltd.

提出了一种基于混沌理论和径向基函数(RBF)神经网络的电力短期负荷多元预测方法。为了应用该方法，首先计算了最大李雅普诺夫指数和相关维数，表明电力负荷序列本质上是一个混沌时间序列。然后，提出了一种考虑历史负荷和温度的多变量混沌预测方法。将单变量时间序列的相空间重构推广到多变量时间序列。历史负荷序列和温度序列的延迟时间和嵌入维数分别由互信息和最小预测误差决定。最后，采用三层RBF神经网络对一天和一周的负荷进行预测。对重庆电网的实际负荷数据进行了测试。日预报和周预报结果表明，与单变量预报方法相比，本文提出的多变量预报方法显著提高了预报精度。并对预测误差和今后的工作进行了讨论。基于混沌理论的多变量预测作为STLF的一种高效替代方法，具有潜在的应用前景。版权所有©2010 John Wiley & Sons, Ltd

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