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Data mining & pattern recognition of voltage sag based on K-means clustering algorithm 基于k均值聚类算法的电压暂降数据挖掘与模式识别
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7286079
R. Duan, F. H. Wang, J. Zhang, R. Huang, X. Zhang
With the increasing demands of power supply, the electric power quality especially the voltage sag deserves more concerns. This paper presents an approach of K-means clustering analysis algorithm to classify and recognize the voltage sag from the measured historical data of large-scale grid in Shenzhen, China. The distances among different sag incidents in distribution diagram are calculated first. When some distances are nearer, a cluster center which is called centroid can be set to represent these incidents. Then the centroid amounts and locations are determined based on iterative updating method. The sag amplitude and duration time reflected by these centroids can be regarded as the voltage sag characteristics of similar substations, which will represent the operation condition and find out the weak link of whole power systems. Thus the algorithm converts the complicated and disordered sag incidents into some typical sag models, which provides the theoretical evidence for simplifying analysis and practical management of voltage sags.
随着人们对电力需求的不断提高,电能质量特别是电压骤降问题越来越受到人们的关注。本文提出了一种基于k均值聚类分析算法对深圳大电网实测历史数据进行电压暂降分类识别的方法。首先计算分布图中不同凹陷事件之间的距离。当某些距离较近时,可以设置一个称为质心的群集中心来表示这些事件。然后基于迭代更新方法确定质心数量和位置。这些质心所反映的电压暂降幅度和持续时间可以看作是同类变电站的电压暂降特征,可以代表整个电力系统的运行状况,找出整个电力系统的薄弱环节。该算法将复杂无序的暂降事件转化为典型的暂降模型,为简化电压暂降分析和实际管理提供了理论依据。
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引用次数: 11
Practical experience in assessing the effects of extreme contingencies with respect to standards TPL-001-4 and CIP-014-1 根据TPL-001-4和CIP-014-1标准评估极端突发事件影响的实践经验
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7285836
M. Papic, O. Ciniglio, M. Vaiman
This paper presents a comprehensive, practical approach to identify and analyze the effects of extreme contingencies that might lead to widespread power disruptions and cascading. Modern power systems are normally designed to withstand n-1 and credible n-2 outages. The ability of a system to survive extreme contingencies and major disturbances has not been comprehensively addressed by system planners in the past. Extreme outages are a result of either cyber or physical threats. Both types of events expose transmission planners and operation engineers to new challenges, including identifying how to minimize their impact on system vulnerability. The suggested approach is to further enhance the study approach currently used by Idaho Power in performing North American Electric Reliability Corporation (NERC) compliance studies. Understanding the effects of extreme contingencies on vulnerabilities of Idaho Power's system is needed to determine when a disruption of service is likely to occur and how to take appropriate steps to reduce the associated risk. Identification of extreme contingencies using generation reallocation and load shedding for mitigation of their effects are illustrated using an IEEE RTS-96 test system and a model of the actual Idaho portion of the Western Electricity Coordinating Council (WECC) system.
本文提出了一种全面、实用的方法来识别和分析可能导致大范围电力中断和级联的极端突发事件的影响。现代电力系统通常设计为承受n-1和可靠的n-2停电。系统在极端突发事件和重大干扰中生存的能力在过去还没有被系统规划者全面地解决。极端的中断是由网络或物理威胁造成的。这两种类型的事件都给输电规划人员和运行工程师带来了新的挑战,包括确定如何最大限度地减少它们对系统脆弱性的影响。建议的方法是进一步加强爱达荷电力公司目前在执行北美电力可靠性公司(NERC)合规研究中使用的研究方法。需要了解极端突发事件对爱达荷电力公司系统脆弱性的影响,以确定何时可能发生服务中断,以及如何采取适当措施降低相关风险。使用IEEE RTS-96测试系统和西部电力协调委员会(WECC)系统的实际爱达荷部分模型说明了利用发电重新分配和减载来识别极端突发事件以减轻其影响。
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引用次数: 4
Information theoretic index for regime shifts in power systems 电力系统状态转移的信息理论指标
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7286525
Lingyu Ren, Peng Zhang, Hua Ye
A regime shift occurs when a dynamical system's state shifts from a nominal equilibrium to an alternative equilibrium. This concept is often used to describe the collapse of ecological systems, but it also appears in many engineering systems; most notably in the voltage collapse of power systems. This paper uses an information theoretic index known as the Fisher Information (FI) as a real-time statistical index detecting regime shifts in a stressed IEEE 118 bus system. These preliminary experiments demonstrate that the FI index indeed provide early warning of abnormal operations leading to voltage instability. As a data driven method the proposed FI index provides a useful tool supporting the real-time monitoring of power system operations.
当一个动力系统的状态从名义平衡状态转移到备选平衡状态时,就发生了状态转移。这个概念经常被用来描述生态系统的崩溃,但它也出现在许多工程系统中;最明显的是电力系统的电压崩溃。本文使用一种被称为Fisher信息(FI)的信息理论指标作为实时统计指标来检测IEEE 118总线系统中的状态变化。这些初步实验表明,FI指数确实提供了导致电压不稳定的异常操作的早期预警。作为一种数据驱动的方法,所提出的FI指数为电力系统运行的实时监控提供了一个有用的工具。
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引用次数: 0
An integrated nine-switch power conditioner parallel with transformer for power quality enhancement 集成九开关电源调节器与变压器并联,提高电能质量
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7285798
Ye Shi, Zai-jun Wu, Xiaobo Dou, M. Hu
In this paper, a configuration with a dual-port power converter bridging two sides of the transformer is proposed for power quality enhancement in distribution systems. The proposed configuration employs a nine-switch power converter instead of the traditional back-to-back power converter with 12 switches. The high voltage side port works as a double resonance injection hybrid active power filter to enhance the injection ability of harmonic currents, while the low voltage side port works as a traditional shunt active filter, thus the harmonic and reactive currents to the transformer can be reduced while the stability of DC-link voltage is enhanced. The simulation shows the validity of the proposed configuration.
为了提高配电系统的电能质量,本文提出了一种双端口电源变换器桥接变压器两侧的配置方案。提出的配置采用9开关功率转换器,而不是传统的12开关背靠背功率转换器。高压侧端口作为双谐振注入混合有源电源滤波器,增强谐波电流注入能力;低压侧端口作为传统的并联有源滤波器,可以减少变压器的谐波和无功电流,同时增强直流链路电压的稳定性。仿真结果表明了该结构的有效性。
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引用次数: 1
Dynamic state estimation and parameter calibration of a DFIG using the ensemble Kalman filter 基于集成卡尔曼滤波的DFIG动态估计与参数定标
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7285990
Rui Fan, Zhenyu Huang, Shaobu Wang, R. Diao, Da Meng
With the growing interest in the application of wind energy, doubly fed induction generators (DFIG) play an increasingly essential role in the power industry. It has been well recognized that modeling and monitoring the dynamic behavior of DFIGs are important to ensure power system reliability. Real-time estimation of the dynamic states of a DFIG is possible with high-speed measurements. But how to use such measurements to have high-quality estimation remains to be a challenge. Estimating dynamic states relies on a good dynamic model of the DFIG. Building a high-fidelity model is a problem in tandem with the dynamic state estimation problem. In this paper, we propose an ensemble Kalman filter (EnKF)-based method for the state estimation and parameter calibration of a DFIG. The mathematical formulation of state estimation combining with parameter estimation is presented. Simulation cases were studied to demonstrate the accuracy of both dynamic state estimation and parameter estimation. Sensitivity analysis is performed with respect to the measurement noise, initial state errors and parameter errors. The results indicate this EnKF-based method has a robust performance on the state estimation and parameter calibration of a DFIG.
随着人们对风能应用的日益关注,双馈感应发电机(DFIG)在电力工业中发挥着越来越重要的作用。对DFIGs的动态行为进行建模和监测对于保证电力系统的可靠性具有重要意义。通过高速测量可以实时估计DFIG的动态状态。但是如何使用这样的度量来获得高质量的估计仍然是一个挑战。动态状态的估计依赖于DFIG良好的动态模型。建立高保真模型是一个与动态状态估计问题并行的问题。本文提出了一种基于集成卡尔曼滤波(EnKF)的DFIG状态估计和参数定标方法。给出了状态估计与参数估计相结合的数学公式。通过仿真实例验证了动态估计和参数估计的准确性。对测量噪声、初始状态误差和参数误差进行了灵敏度分析。结果表明,基于enkf的方法对DFIG的状态估计和参数标定具有较好的鲁棒性。
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引用次数: 15
Maximizing transmission efficiency using the National Grid Electricity Balancing System 利用国家电网电力平衡系统最大限度地提高传输效率
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7285821
Show-Kang Chang, C. Teoh, Ye Tao, Peng Peng, Han Li, J. Dyer, S. Barnett
Security constrained scheduling has been widely implemented in various power system operations and electricity markets. The practice of securing post-contingency flows preventively to long-term ratings has resulted in transmission network under-utilization. This paper presents a security constrained scheduling process that has been implemented in the National Grid Electricity Balancing System. The process is designed to exploit short-term ratings when determining pre-contingency and post-contingency actions thereby maximizing transmission efficiency. A functional overview is provided. The security criteria adopted, the actions used to secure contingencies, and the logic used to determine corrective time are described. Computational efficiency and results of the implementation are presented.
安全约束调度已广泛应用于各种电力系统运行和电力市场。预防性确保应急后流量达到长期额定值的做法导致输电网络利用率不足。本文提出了一种已在国家电网电力平衡系统中实现的安全约束调度过程。该过程旨在利用短期评级来确定应急前和应急后的行动,从而最大限度地提高传输效率。提供了功能概述。本文描述了所采用的安全标准、用于确保意外事件的操作以及用于确定纠正时间的逻辑。给出了计算效率和实现结果。
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引用次数: 0
Electric vehicle capacity forecasting model with application to load levelling 电动汽车容量预测模型及其在负荷均衡中的应用
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7285829
Bowen Zhou, Tim Brian Littler, A. Foley
There are many uncertainties associated with forecasting electric vehicle charging and discharging capacity due to the stochastic nature of human behavior surrounding usage and intermittent travel patterns. This uncertainty if unmanaged has the potential to radically change traditional load profiles. Therefore optimal capacity forecasting methods are important for large-scale electric vehicle integration in future power systems. This paper develops a capacity forecasting model considering eight particular uncertainties under three categories to overcome this issue. The model is then applied to a UK summer scenario in 2020. The results of this analysis demonstrate that the proposed model is accurate for charge and discharge prediction and a feasible basis for steady-state analysis required for large-scale electric vehicle integration.
由于人类行为的随机性和间歇性出行模式,预测电动汽车充放电能力存在许多不确定性。非托管的这种不确定性有可能从根本上改变传统的负载配置。因此,最优容量预测方法对未来电力系统中大规模电动汽车集成具有重要意义。为了克服这一问题,本文建立了一个考虑三类八种特定不确定性的容量预测模型。然后将该模型应用于2020年英国夏季的情景。分析结果表明,该模型具有较好的充放电预测精度,为大规模电动汽车集成化所需的稳态分析提供了可行的基础。
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引用次数: 10
Multiple solutions of PMSG with different orientations and reference powers 具有不同取向和参考功率的PMSG的多个解
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7285740
Shenghu Li
The existing steady-state models for the permanent magnet synchronous generator (PMSG) are based on the constant voltage, or quantify electromagnetic transient. This paper proves that the equivalent voltage behind stator circuit is proportional to the rotor speed, and dependent on wind speeds, thus invalid. The steady-state constraints are proved to be indeterminate equations, whose unique solution requires additional constraint, i.e. stator current or stator voltage orientation which are not consistent with var constraint, yielding different stator voltages/currents, losses and efficiencies. Compared with current orientation, voltage orientation needs less var support, but with lower efficiency. With power dispatch by adjusting rotor speed or pitch angle, multiple solutions are quantified, and modified flat starts are proposed to improve convergence.
现有的永磁同步发电机(PMSG)稳态模型是基于恒压或定量电磁暂态的。本文证明了定子电路后的等效电压与转子转速成正比,而与风速有关,因此无效。证明了稳态约束为不定方程,其唯一解需要附加约束,即定子电流或定子电压方向与无功约束不一致,产生不同的定子电压/电流、损耗和效率。与电流取向相比,电压取向所需的无功支持较少,但效率较低。通过调整转子转速或俯仰角进行功率调度,量化了多个解,并提出了改进的平启动以提高收敛性。
{"title":"Multiple solutions of PMSG with different orientations and reference powers","authors":"Shenghu Li","doi":"10.1109/PESGM.2015.7285740","DOIUrl":"https://doi.org/10.1109/PESGM.2015.7285740","url":null,"abstract":"The existing steady-state models for the permanent magnet synchronous generator (PMSG) are based on the constant voltage, or quantify electromagnetic transient. This paper proves that the equivalent voltage behind stator circuit is proportional to the rotor speed, and dependent on wind speeds, thus invalid. The steady-state constraints are proved to be indeterminate equations, whose unique solution requires additional constraint, i.e. stator current or stator voltage orientation which are not consistent with var constraint, yielding different stator voltages/currents, losses and efficiencies. Compared with current orientation, voltage orientation needs less var support, but with lower efficiency. With power dispatch by adjusting rotor speed or pitch angle, multiple solutions are quantified, and modified flat starts are proposed to improve convergence.","PeriodicalId":423639,"journal":{"name":"2015 IEEE Power & Energy Society General Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125939440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Evaluation of NERC's BRD frequency control standard in hydroelectric generation 国家电网BRD频率控制标准在水力发电中的评价
Pub Date : 2015-10-05 DOI: 10.1109/PESGM.2015.7286017
M. F. Moghadam, W. Dunford, E. Vaahedi, M. Metcalfe
During decades of interconnected operation of power systems, frequency control standards have evolved to fairly share the benefits of interconnection and tie-line bias control among Balancing Authorities (BAs). The new draft standards of North American Electric Reliability Council (NERC) define a frequency-dependent Balancing Authority ACE Limit (BAAL) within which BAs must control their Area Control Error (ACE). In this paper, the effects of the new draft standards in real-time Automatic Generation Control (AGC) of a hydroelectric dominated utility are modelled and assessed. Generation scheduling and real-time AGC logic based on taking maximum advantage of new wide bounds of ACE are modelled. It is shown, through dynamic simulations, that generation control under Balance Resource and Demand (BRD) standards is more efficient in term of less generation loss and unit maneuvering.
在几十年的电力系统互联运行过程中,频率控制标准已经发展到在平衡机构(ba)之间公平地分享互联和联络线偏压控制的好处。北美电力可靠性委员会(NERC)的新标准草案定义了频率相关平衡权限ACE限制(BAAL),在此范围内,BAs必须控制其区域控制误差(ACE)。本文对新标准草案对某水电主导电厂实时自动发电控制(AGC)的影响进行了建模和评估。建立了基于最大限度利用ACE新宽限的发电调度和实时AGC逻辑模型。动态仿真结果表明,在资源需求平衡(BRD)标准下的发电控制在发电损失和机组机动方面更有效。
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引用次数: 5
Kernel methods for short-term spatio-temporal wind prediction 短期时空风预报的核心方法
Pub Date : 2015-09-30 DOI: 10.1109/PESGM.2015.7285965
J. Dowell, Stephan Weiss, D. Infield
Two nonlinear methods for producing short-term spatio-temporal wind speed forecast are presented. From the relatively new class of kernel methods, a kernel least mean squares algorithm and kernel recursive least squares algorithm are introduced and used to produce 1 to 6 hour-ahead predictions of wind speed at six locations in the Netherlands. The performance of the proposed methods are compared to their linear equivalents, as well as the autoregressive, vector autoregressive and persistence time series models. The kernel recursive least squares algorithm is shown to offer significant improvement over all benchmarks, particularly for longer forecast horizons. Both proposed algorithms exhibit desirable numerical properties and are ripe for further development.
提出了两种产生短时时空风速预报的非线性方法。从相对较新的核方法中,引入了核最小均方算法和核递归最小二乘算法,并使用它们对荷兰六个地点的风速进行了1至6小时的预测。将所提方法的性能与线性模型、自回归模型、向量自回归模型和持续时间序列模型进行了比较。核递归最小二乘算法在所有基准测试中都有显著的改进,特别是对于较长的预测范围。这两种算法都表现出理想的数值特性,并且有进一步发展的空间。
{"title":"Kernel methods for short-term spatio-temporal wind prediction","authors":"J. Dowell, Stephan Weiss, D. Infield","doi":"10.1109/PESGM.2015.7285965","DOIUrl":"https://doi.org/10.1109/PESGM.2015.7285965","url":null,"abstract":"Two nonlinear methods for producing short-term spatio-temporal wind speed forecast are presented. From the relatively new class of kernel methods, a kernel least mean squares algorithm and kernel recursive least squares algorithm are introduced and used to produce 1 to 6 hour-ahead predictions of wind speed at six locations in the Netherlands. The performance of the proposed methods are compared to their linear equivalents, as well as the autoregressive, vector autoregressive and persistence time series models. The kernel recursive least squares algorithm is shown to offer significant improvement over all benchmarks, particularly for longer forecast horizons. Both proposed algorithms exhibit desirable numerical properties and are ripe for further development.","PeriodicalId":423639,"journal":{"name":"2015 IEEE Power & Energy Society General Meeting","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114763517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
期刊
2015 IEEE Power & Energy Society General Meeting
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