European Transactions on Electrical Power最新文献

英文中文

Probabilistic power system stabilizer design with consideration of optimal siting using recursive Genetic Algorithm 考虑最优选址的递归遗传算法概率电力系统稳定器设计

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.508

Z. Wang, C. Chung, K. Wong, D. Gan, Y. Xue

This paper proposes an approach for the probabilistic power system stabilizer (PSS) design problem with consideration of optimal siting of the PSSs under multiple operating conditions. The design problem is first formulated as a combinational optimization problem which contains discrete and continuous variables. The paper then develops a recursive Genetic Algorithm (GA) to solve the design problem. An integer-binary mixed coding scheme and a partially matched crossover (PMX) operator are applied for the recursive GA for performance enhancement. The effectiveness of the proposed recursive GA approach for probabilistic PSS design scheme is demonstrated on two test systems. Copyright © 2010 John Wiley & Sons, Ltd.

引用次数: 13

Allocation of available transfer capability in planning horizon 规划范围内可用传输能力的分配

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.510

A. Rajabi-Ghahnavieh, M. Fotuhi‐Firuzabad, R. Feuillet

In the United States electricity market standard, when several transmission service requests (TSRs) are made for a specific pair of power injection/extraction points, the independent system operator (ISO) must allocate the available transmission capability (ATC) associated with the pair to the requests. An ATC allocation must determine the amount of accepted requests as well as the priority of the accepted requests during emergencies. The requests could have different types (recallable/non-recallable), tariffs, and time frames and these factors must be properly considered in ATC allocation. This paper proposes a method for optimal ATC allocation in the planning horizon which incorporates the type and tariffs of the requests in a mixed integer linear optimization programming for which the expected net revenue of ATC allocation on a seasonal base has to be maximized. The method also incorporates maintenance and forced outage of power system components as well as the load forecast uncertainty in ATC allocation problem. Once allocation accomplished by solving the optimization problem, the amount of the accepted requests and their priorities to the power system operator during emergencies are determined. The proposed method is applied to the modified IEEE reliability test system (IEEE-RTS) and its performance is evaluated. A comparison is made between the results obtained by the proposed method and those obtained using existing ATC allocation methods. Two approaches are finally presented and evaluated to apply the proposed method for allocating ATC to the requests with a yearly base. Copyright © 2010 John Wiley & Sons, Ltd.

在美国电力市场标准中，当针对特定的一对电力注入/提取点提出多个传输服务请求(tsr)时，独立系统运营商(ISO)必须将与该对相关的可用传输能力(ATC)分配给请求。ATC分配必须确定在紧急情况下接受请求的数量以及接受请求的优先级。请求可能有不同的类型(可收回/不可收回)、关税和时间框架，在ATC分配中必须适当考虑这些因素。本文提出了一种考虑请求类型和费率的混合整数线性优化规划方法，该方法在规划范围内实现了空中交通管制分配的预期净收入在季节性基础上的最大化。该方法还考虑了ATC分配问题中电力系统部件的维护和强制停运以及负荷预测的不确定性。通过求解优化问题完成分配后，确定紧急情况下可接受的请求数量及其对电力系统运营商的优先级。将该方法应用于改进后的IEEE可靠性测试系统(IEEE- rts)，并对其性能进行了评估。将所提方法与现有ATC分配方法的结果进行了比较。最后提出了两种方法，并对其进行了评估，以应用所提出的方法对以年为基础的请求进行空中交通管制分配。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 3

AC pollution flashover circuit model for composite insulator based on multiple arcs series 基于多弧串联的复合绝缘子交流污闪电路模型

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.519

L. Shu, Qi Yuan, Zhijin Zhang, Xingliang Jiang, Q. Hu, Caixin Sun

With the increasing application of composite insulator in the power system, pollution flashover often occurs. However, no model can exactly predict pollution flashover voltage of composite insulator at present. Based on high-speed photography of AC pollution flashover process, a model, which is in view of pollution severity, air pressure, shed configuration, and hydrophobicity level and which is suitable for composite insulator with any shed configuration, is proposed. Influences of pollution severity and hydrophobicity on flashover voltage and pressure characteristic exponent are analyzed, from which derives a calculative formula of flashover voltage. Calculated results from the model, validated by experiments, demonstrate that there is a power function relationship between flashover voltage and hydrophobicity level β, and characteristic exponent of hydrophobicity level β is the same as that of pollution severity. Meanwhile, the exponent characterizing the influence of air pressure increases with the fall of pollution severity and the rise of hydrophobicity. Copyright © 2010 John Wiley & Sons, Ltd.

随着复合绝缘子在电力系统中的应用日益广泛，污染闪络现象时有发生。然而，目前还没有一种模型能够准确预测复合绝缘子的污闪电压。在高速摄影交流污闪过程的基础上，提出了一个考虑污染程度、气压、棚型和疏水性的模型，该模型适用于任意棚型的复合绝缘子。分析了污染程度和疏水性对闪络电压和压力特性指数的影响，推导出了闪络电压的计算公式。该模型计算结果经实验验证，表明闪络电压与疏水水平β呈幂函数关系，疏水水平β的特征指数与污染严重程度的特征指数相同。同时，随着污染程度的降低和疏水性的增加，表征气压影响的指数也随之增加。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 4

Transfer capacity enhancement by adaptive coordinated control of HVDC‐links based on forecasted load paths 基于负荷路径预测的自适应协调控制增强输电容量

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.511

R. Eriksson, M. Perninge, L. Söder

Due to the intensive use of the transmission networks one of the major issues in electric energy trading is bottlenecks limiting the transfer capacity between different system areas. In this articl ...

由于输电网络的集约使用，电力交易的主要问题之一是限制不同系统区域之间传输能力的瓶颈问题。在这篇文章中……

引用次数: 4

Reactive power planning with voltage stability enhancement using covariance matrix adapted evolution strategy 基于协方差矩阵自适应进化策略的电压稳定性增强无功规划

European Transactions on Electrical Power

Pub Date : 2011-04-01 DOI: 10.1002/ETEP.500

S. Jeyadevi, S. Baskar, M. Iruthayarajan

This paper presents the application of Covariance matrix adapted evolution strategy (CMAES) to reactive power planning (RPP) problem by minimizing the combined total cost of energy loss and the allocation cost of additional reactive power sources. Voltage stability index (L-index) is considered as an additional constraint in order to include the system stability into account. To improve the search efficiency of CMAES, penalty parameter-less scheme is employed for constraint handling. To determine the performance of the CMAES method on reactive power planning problem, IEEE-30 bus test system and Tamil Nadu Electricity Board (TNEB)-69 bus system (a practical system in India) are taken. For comparison purposes, the results of real-coded GA (RGA), particle swarm optimization (PSO), sequential quadratic programming (SQP), and Broyden–Fletcher–Goldfarb–Shanno (BFGS) methods are considered. The simulation results reveal that the CMAES algorithm performs better in terms of energy cost, investment cost, and consistency in getting optimal solution. Karush–Kuhn–Tucker (KKT) conditions are also applied on the best solution obtained using CMAES algorithm to substantiate a claim on optimality. Copyright © 2010 John Wiley & Sons, Ltd.

将协方差矩阵自适应进化策略(CMAES)应用于无功规划(RPP)问题，以最小化总能量损失成本和附加无功源分配成本。电压稳定指数(L-index)被认为是一个附加的约束，以便将系统的稳定性考虑在内。为了提高CMAES的搜索效率，采用无惩罚参数的方法进行约束处理。为了确定CMAES方法在无功规划问题上的性能，以IEEE-30母线测试系统和泰米尔纳德邦电力委员会(TNEB)-69母线系统(印度的一个实际系统)为例进行了研究。为了比较，考虑了实编码遗传算法(RGA)、粒子群优化算法(PSO)、顺序二次规划算法(SQP)和BFGS算法的结果。仿真结果表明，CMAES算法在获得最优解的能量成本、投资成本和一致性方面具有更好的性能。并将KKT条件应用于CMAES算法得到的最优解，证明了该算法的最优性。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 14

Numerical calculation of the corona onset voltage for bundle conductors for HVDC transmission line 高压直流输电成束导线电晕起始电压的数值计算

European Transactions on Electrical Power

Pub Date : 2011-01-01 DOI: 10.1002/ETEP.406

Zhong‐Xin Li, Guang-Fan Li, Jian-Bin Fan, Yu Yin

The corona onset voltage (COV) for bare overhead bundle conductors for transmission lines has been investigated using numerical calculations and the gas discharge theory. First, an accurate numerical method, the charge simulation method, was used to calculate the electric field distribution in the vicinity of bare sub-conductors in bundles. Then the electric field values and a criterion from the gas discharge theory were used to evaluate the onset voltage for negative coronas on the bare sub-conductors. The COVs obtained are in good agreement with literature data for laboratory models and full-scale test lines. Some numerical results for the COV for six-bundle conductors are also discussed. Copyright © 2010 John Wiley & Sons, Ltd.

引用次数: 6

Optimal short-term natural gas nomination decision in generation portfolio management 发电组合管理中天然气短期最优提名决策

European Transactions on Electrical Power

Pub Date : 2011-01-01 DOI: 10.1002/ETEP.405

Dan X. Zhuang, John N. Jiang, D. Gan

Because the short-term natural gas markets usually close earlier than the electric power markets, most generation companies have to make fuel nomination for natural gas fired power plants (NGFPP) without knowing the actual generation levels, which depend on many uncertain factors such as, new market driven unit commitments, load variations, dispatch instructions, and/or other service requests next day. This is a new issue in electric power market. A novel two-step simulation-optimization framework for valuation of day-ahead natural gas nomination is proposed in this paper. In Step I, the optimal generation levels and profit distributions of feasible gas nomination decisions are simulated, and gas nomination decision is based on Utility Maximization Theory in Step II. The impacts of most major factors such as variable load, price volatilities and long-term fuel contract/storage are considered in this framework. An application of the proposed framework is demonstrated by a numerical example. The results show that the proposed framework is desirable in several key aspects. Copyright © 2010 John Wiley & Sons, Ltd.

由于短期天然气市场通常比电力市场关闭得早，大多数发电公司不得不在不知道实际发电水平的情况下为天然气发电厂(NGFPP)提名燃料，这取决于许多不确定因素，如新市场驱动的机组承诺、负荷变化、调度指令和/或其他服务请求。这是电力市场的一个新问题。本文提出了一种新的两步模拟-优化框架，用于天然气日前提名的评估。在步骤1中，模拟可行的天然气提名决策的最优发电水平和利润分配，在步骤2中，天然气提名决策基于效用最大化理论。在这个框架中考虑了可变负荷、价格波动和长期燃料合同/储存等大多数主要因素的影响。通过数值算例说明了该框架的应用。结果表明，所提出的框架在几个关键方面是可取的。版权所有©2010 John Wiley & Sons, Ltd

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引用次数: 8

Analyzing dynamic performance of stressed power systems in vicinity of instability by modal series method 用模态级数法分析失稳附近受力电力系统的动态性能

European Transactions on Electrical Power

Pub Date : 2009-11-01 DOI: 10.1002/ETEP.279

A. H. Naghshbandy, H. Shanechi, A. Kazemi, I. Pourfar

Highly stressed power systems exhibit complex dynamic behaviors such as inter-area oscillations when subjected to large disturbances. In such conditions, nonlinear effects have dominant role in determining dynamic response of the systems. In this paper by using modal series method, dynamic behaviors of the stressed power systems in severe conditions and near instability have been studied. Also two measures, mode dominance measure (MDM) and most perturbed machine factor (MPF) have been introduced. They determine the most dominant modes and identify the most perturbed generators when the system is subjected to a given fault. Contribution factors have been used to show the links between identified modes and machines from the analysis. Time domain simulation has been helped for validation of the results. By using similarity transformation, state variables have been represented in modal space and utilized to check the results. The studies are carried out on the IEEE 50-generator test system which demonstrates a wide range of dynamic characteristics at different loading levels and fault scenarios. Copyright © 2008 John Wiley & Sons, Ltd.

高压电力系统在受到大扰动时表现出复杂的动态行为，如区域间振荡。在这种情况下，非线性效应对系统的动力响应起主导作用。本文采用模态级数法研究了受应力电力系统在恶劣工况和近失稳状态下的动力特性。介绍了模式优势度度量(MDM)和最扰动机因子(MPF)两种度量方法。当系统遭受给定故障时，它们确定了最主要的模式，并确定了最受干扰的发电机。贡献因子被用来显示从分析中确定的模式和机器之间的联系。时域仿真有助于验证结果。通过相似变换，将状态变量表示为模态空间，并对结果进行检验。该研究在IEEE 50发电机测试系统上进行，该系统在不同负载水平和故障场景下展示了广泛的动态特性。版权所有©2008 John Wiley & Sons, Ltd

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引用次数: 5

Solutions to transmission constrained generation expansion planning using differential evolution 基于差分进化的输电约束下发电扩展规划求解

European Transactions on Electrical Power

Pub Date : 2009-11-01 DOI: 10.1002/ETEP.275

S. Kannan, P. Murugan

This paper describes the application of differential evolution (DE) technique for solving the transmission constrained generation expansion planning (TC-GEP) problem. The TC-GEP is a large scale and challenging problem for the decision makers (to decide upon site, capacity, type of fuel, etc.) as there exist a large number of combinations. The test system used is a modified IEEE-30 bus test system with a planning horizon of 6 years. The results are compared and validated with dynamic programming (DP). Copyright © 2008 John Wiley & Sons, Ltd.

引用次数: 11

Computation of AC flashover voltage of polluted HV insulators using a dynamic arc model 用动态电弧模型计算污染高压绝缘子交流闪络电压

European Transactions on Electrical Power

Pub Date : 2009-07-01 DOI: 10.1002/ETEP.249

M. Gençoglu, M. Cebeci

Flashover of polluted insulators is still a serious threat to the safe operation of a power transmission system. Despite the extensive investigations carried out on the pollution performance of the insulators, the flashover characteristics are not well understood. Recent theoretical and experimental research on polluted insulators is yet to yield a perfect generalized mathematical model which can accurately predict critical flashover voltage. In this paper, the pollution flashover on the high voltage insulators has been investigated and a new dynamic arc model has been proposed. For this purpose, firstly the concerned insulators' scaled shapes were partitioned into triangular elements, then finite element method (FEM) was implemented for obtaining potential distribution on the surface of insulator and finally flashover voltages were determined by using the developed arc model. For a number of common insulators of different geometries the computed results of flashover voltages on the selected string insulators have been compared to experimental results of some other research. Pollution flashover behaviors of the insulators have been taken into consideration and the validity of the model was thus verified. Copyright © 2008 John Wiley & Sons, Ltd.

受污染绝缘子的闪络仍然严重威胁着输电系统的安全运行。尽管对绝缘子的污染性能进行了广泛的研究，但对闪络特性的了解并不充分。目前对污染绝缘子的理论和实验研究还没有一个完善的、能准确预测临界闪络电压的广义数学模型。本文对高压绝缘子上的污闪现象进行了研究，提出了一种新的动态电弧模型。为此，首先将相关绝缘子的尺度形状划分为三角形单元，然后采用有限元方法得到绝缘子表面的电势分布，最后利用所建立的电弧模型确定闪络电压。对几种不同几何形状的常见绝缘子，将所选串形绝缘子上闪络电压的计算结果与其他一些研究的实验结果进行了比较。考虑了绝缘子的污闪行为，验证了模型的有效性。版权所有©2008 John Wiley & Sons, Ltd

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