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LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings最新文献

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Inverters without filters 无滤波器逆变器
T. Little, S. Sivakumar
This paper presents the optimized conditions for stepped wave inverters in order to minimize the total harmonic distortion present in the output waveform. It is shown that one- and two-level waveforms do not have sufficient degrees of freedom to meet harmonic standards like the IEEE 519. However three-level waveforms can be constructed, which meet such power quality standards and as a result, do not require output filtering.
本文提出了阶跃波逆变器的优化条件,以使输出波形中的总谐波失真最小化。结果表明,单电平和双电平波形没有足够的自由度来满足像IEEE 519这样的谐波标准。然而,三电平波形可以构建,满足这样的电能质量标准,因此,不需要输出滤波。
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引用次数: 8
Stator-winding fault diagnosis of PM brushless DC motor drives 永磁无刷直流电机定子绕组故障诊断
M. Awadallah, M. Morcos
A model-based diagnostic system for stator winding inter-turn faults of PM brushless DC motor drives is presented. A transient model of the drive system is set up and run under different healthy and faulty conditions. The steady-state supply current is selected as the diagnostic signal to compare the healthy operation to the faulty operation under different loads. The supply current signal is transformed to the frequency domain using the discrete Fourier transform (DFT). Appropriate diagnostic indices are extracted from the supply current spectrum to differentiate between healthy and different faulty conditions.
提出了一种基于模型的永磁无刷直流电机定子绕组匝间故障诊断系统。建立了驱动系统的瞬态模型,并在不同的健康和故障条件下运行。选取稳态电源电流作为诊断信号,对不同负载下的正常运行和故障运行进行比较。采用离散傅立叶变换(DFT)将电源电流信号变换到频域。从电源电流谱中提取适当的诊断指标来区分健康和不同的故障状态。
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引用次数: 8
Transient model of power transformer using wavelet filter bank 基于小波滤波器组的电力变压器暂态模型
S. A. Saleh, M. Rahman
This paper presents a model of the power transformer for electromagnetic transient studies, which employs a wavelet filter bank. In this model both the primary and the secondary windings are represented by stages of a wavelet filter bank where the dimensions of such a filter bank depend on the number of turns of primary windings and secondary windings. The basic building block consists of stages of the wavelet filter bank. Transformer total response is composed of the sum of responses of all stages, which depends on the nature of the primary current. Using the wavelet filter model, the losses due to eddy currents, leakage flux, and inrush currents have been studied. The proposed wavelet filter model has been found to be suitable for power transformer inrush currents including high frequency transient effects.
本文提出了一种用于电力变压器电磁暂态研究的小波滤波器组模型。在该模型中,初级绕组和次级绕组都由小波滤波器组的级表示,其中小波滤波器组的尺寸取决于初级绕组和次级绕组的匝数。基本构件由小波滤波器组的各个阶段组成。变压器总响应由各级响应的总和组成,它取决于一次电流的性质。利用小波滤波模型,研究了涡流、漏磁和浪涌造成的损耗。所提出的小波滤波模型适用于包含高频暂态效应的电力变压器励磁涌流。
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引用次数: 5
Artificial neural network application to alleviate voltage instability problem 应用人工神经网络缓解电压不稳定问题
A. Sallam, A.M. Khafaga
This paper argues that the artificial neural network (ANN) is an important technique and can be applied to control voltage instability problems in two ways. The first is to control voltage collapse by using load shedding. In this way the minimum and optimal ratio of load shedding can be calculated. The second is to calculate the reactive power required to control sources in the electric power system. The strengths of this powerful technique lie in its ability for modeling and solving many types of problems. The ANN is designed for those two mentioned ways. A multi-layer feed forward ANN trained with error backpropagation learning is proposed. This network is applied to a stressed power system at different load levels. Simulation results on a test system are reported in this paper.
本文认为人工神经网络(ANN)是一种重要的技术,可以从两方面来控制电压不稳定问题。第一种是通过减载控制电压崩溃。这样就可以计算出最小和最佳减载比。二是计算电力系统中控制电源所需的无功功率。这种强大的技术的优势在于它能够建模和解决许多类型的问题。人工神经网络就是针对这两种方式设计的。提出了一种基于误差反向传播学习的多层前馈神经网络。该网络应用于不同负荷水平下的受压电力系统。本文报道了一个测试系统的仿真结果。
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引用次数: 8
Automated testing of protective relays using advanced visual test software 使用先进的可视化测试软件自动测试保护继电器
C. Paduraru
The article describes the concept of automatic testing of protective relays in power industry. First, the increased need for automatic test modules is explained. Next, a detailed example is provided using the "load encroachment characteristic". Relay settings and testing approach are explained step by step. Finally, the capability of the software is emphasized and conclusions are drawn.
介绍了电力工业中继电保护自动检测的概念。首先,解释了对自动测试模块日益增长的需求。其次,给出了使用“负载侵占特性”的详细示例。继电器设置和测试方法一步一步地解释。最后,重点介绍了软件的性能,并给出了结论。
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引用次数: 1
Fast acting load control 快速作用负载控制
K. Xiong, W. Rosehart
As open access market principles are applied to power systems, stability margins have been steadily decreasing. This has lead to events such as rolling black-outs in several power systems, for example, California, and has generally resulted in increased electricity prices. A novel approach to reduce the tension in electrical systems is to establish a fast acting load control program for price and system stability. This differs from traditional approaches where additional transmission lines and generators need to be installed. Using this approach, load can be modeled and controlled similar to a generator, proving spinning reserve. The paper reviews existing implementations of fast acting load control. Furthermore, in this paper, two Lagrangian based approaches are used to determine optimal locations for fast acting load control. The approaches are formulated to consider economic cost and stability limits. The effects of applying these approaches are analyzed using a 30-bus system, which is derived from the IEEE 30-bus test system.
随着开放接入市场原则在电力系统中的应用,稳定边际一直在稳步下降。这导致了一些事件,例如在加州的几个电力系统中轮流停电,并普遍导致电价上涨。一种新的降低电力系统张力的方法是建立一个快速作用的负荷控制程序,以保证价格和系统的稳定性。这与需要安装额外输电线路和发电机的传统方法不同。利用这种方法,负荷可以像发电机一样建模和控制,证明了旋转储备。本文综述了现有的快速作用负载控制实现方法。此外,本文还采用了两种基于拉格朗日的方法来确定快速作用负荷控制的最佳位置。这些方法的制定考虑了经济成本和稳定性限制。应用这些方法的效果分析了一个30总线系统,该系统是由IEEE 30总线测试系统衍生的。
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引用次数: 2
Security-constrained price-based unit commitment in the deregulated power market 解除管制电力市场中安全约束的基于价格的单位承诺
H. Yamin
This paper describes a coordination process between GENCOs and the ISO for congestion management and reducing the risk of failure to supply loads. The algorithm underlining the coordination technique is the security-constrained price-based unit commitment (SPUC) which is implemented in two states. At first, GENCOs apply priced-based unit commitment (without transmission security constraints), schedule their generating units and submit their energy and capacity bids to the ISO for maximizing their revenues. The ISO obtains transmission information as well from TRANSCOs via OASIS. Using the two sets of generation and transmission data, the ISO executes inter-zonal and intra-zonal congestion management and contingency analysis for minimizing line flow violations and the risk supplying loads. As part of this package, the ISO would have a chance to minimize both transmission flow and reactive (bus voltage) violations. If transmission flow violations persist after the adjustments are made, the solution would provide a signal to GENCOs, based on Benders decomposition, for modifying their initial bids. Accordingly, additional constraints will be introduced in GENCOs for rescheduling generating units and submitting modified bids to the ISO.
本文描述了genco和ISO之间的协调过程,用于拥塞管理和降低故障提供负载的风险。强调协调技术的算法是安全约束的基于价格的单位承诺(SPUC),该算法在两种状态下实现。首先,genco应用基于价格的机组承诺(没有传输安全约束),安排发电机组并向ISO提交其能源和容量投标,以最大化其收益。ISO也通过OASIS从TRANSCOs获取传输信息。ISO使用两组发电和输电数据,执行区域间和区域内的拥堵管理和应急分析,以最大限度地减少线路流违规和供应负荷的风险。作为这个包的一部分,ISO将有机会最小化传输流和无功(母线电压)违规。如果在调整后输电流违规仍然存在,该解决方案将根据Benders分解向genco提供一个信号,以修改其初始出价。因此,将在genco中引入额外的限制,以重新安排发电机组并向ISO提交修改后的标书。
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引用次数: 13
Complex and multiple unsymmetrical fault analysis 复杂和多重非对称故障分析
J. Talaq
A systematic procedure to solving complex and multiple fault problems of power systems is proposed in this paper. Complex faults are combinations of different common unsymmetrical faults that occur at a single bus. Multiple faults are a series of complex faults that occur at several buses at the same time. The proposed method utilize the well known bus impedance matrix method for fault analysis. Examples of both types of faults are given to demonstrate the proposed procedure.
本文提出了一种解决电力系统复杂多故障问题的系统方法。复杂故障是发生在单个母线上的不同常见不对称故障的组合。多故障是指在多个总线上同时发生的一系列复杂故障。提出的方法利用了众所周知的母线阻抗矩阵法进行故障分析。给出了两种类型的故障的例子来演示所提出的程序。
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引用次数: 2
Genetic algorithm and GIS enhanced long term planning of large link structured distribution systems 遗传算法和地理信息系统增强了大链路结构化配电系统的长期规划
M. Skok, D. Skrlec, S. Krajcar
In order to enhance the serviceability in the distribution system genetic algorithm and GIS based method is proposed in this article for planning the link distribution networks. All practical issues such as cost parameters (investments, line losses, maintenance), and technical constraints (voltage drop, thermal limit, reliability) as well as physical routing constraints (obstacles, high cost passages, existing line sections) are taken into consideration. Fuzzy set concept and scenario representation (tree of futures) to model uncertainties, as well as decision making guided by a paradigm of multi-criteria risk analysis are discussed. The merits of the approach are discussed by analyzing its application to a study case based on a real case in a Croatian utility.
为了提高配电网的可维护性,本文提出了基于遗传算法和地理信息系统的配电网规划方法。所有实际问题,如成本参数(投资、线路损耗、维护)、技术限制(电压降、热极限、可靠性)以及物理路由限制(障碍物、高成本通道、现有线路段)都要考虑在内。讨论了模糊集概念和情景表示(期货树)对不确定性的建模,以及多准则风险分析范式指导下的决策。通过分析该方法在克罗地亚公用事业实际案例中的应用,讨论了该方法的优点。
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引用次数: 21
Comparisons on ways of magnitude characterization of power quality disturbances 电能质量扰动幅度表征方法的比较
Z.Q. Wang, S.Z. Zhou, Y.J. Guo
Power quality disturbances are normally recorded by dedicated PQ monitors as sampled points in time. Magnitude is accepted as a significant detection and general classification index in field devices or later assessment analysis. Suitable methods of magnitude characterization are one of the bases of PQD measuring and monitoring. The magnitude of PQD can be determined in several different ways. The RMS voltage, peak voltage and fundamental voltage component are introduced to quantify the voltage severity levels in number of published standards. The paper presents the algorithms of the mentioned approaches implemented in Matlab for quasi real-time situation. The algorithms are FFT-based and/or wavelet transform based. They are validated with the example of the radial test system field voltage sag waveforms provided by the IEEE. The depth-duration characterization of voltage sags is illustrated with the mentioned different approaches. The most appropriate approach is suggested at the end of the paper according to the practical monitoring or measuring requirements. We develop a new PQ monitor with DSP chip infrastructure where all the methods are applied. The proper window length selection and technique to avoid oscillation is also discussed in the rest of the paper. The descriptive information obtained from the magnitude characterization can be used further to extract features for PQD detection and classification.
电能质量扰动通常由专用PQ监视器作为采样时间点记录下来。震级被公认为是现场设备或后期评估分析中重要的检测和一般分类指标。合适的震级表征方法是PQD测量和监测的基础之一。PQD的大小可以用几种不同的方法来确定。引入均方根电压、峰值电压和基波电压分量来量化已发布的若干标准中的电压严重程度。本文给出了上述方法在Matlab中实现的准实时情况下的算法。算法基于fft和/或基于小波变换。并以IEEE提供的径向测试系统现场电压骤降波形为例进行了验证。用上述不同的方法说明了电压跌落的深度-持续特性。最后根据实际的监测或测量要求,提出了最合适的方法。我们开发了一种新的基于DSP芯片的PQ监测器,其中应用了所有的方法。适当的窗长选择和避免振荡的技术也在本文的其余部分进行了讨论。从量级表征中获得的描述信息可以进一步用于提取PQD检测和分类的特征。
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引用次数: 8
期刊
LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings
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