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2011 IEEE/PES Power Systems Conference and Exposition最新文献

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Determining critical activation time of inductive fault current limiters in electric power systems 电力系统电感式故障限流器临界激活时间的确定
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772617
Yucheng Zhang, R. Dougal
With the capacity expansion of power systems, fault currents may exceed the interrupting capacity ratings of circuit breakers (CBs). Inductive fault current limiters (FCLs) are able to effectively limit fault currents and maintain circuit breakers on duty. For power systems of different ratings, it is important to decide whether the parameters of an inductive FCL satisfy the requirement of limiting fault currents under a user-defined value. By analyzing the transient performance of fault current limitation processes, the critical activation time of inductive FCLs has been formulated. The critical activation time relates to the system voltage ratings, the inductances of FCLs and the upbound of fault currents choosen by users or CB's ratings. Fault currents can be limited under any user-defined value when the activation time is shorter than the critical one. The equation reveals that an inductive FCL which works in medium-voltage systems may not be able to limit fault current under a certain value in high-voltage systems. An inductive FCL should be checked according to this equation before it is applied to a paticular power system. These conclusions are verified by simulation results.
随着电力系统容量的扩大,故障电流可能会超过断路器的额定中断容量。电感式故障限流器(fcl)能够有效地限制故障电流并保持断路器值班。对于不同额定值的电力系统,确定电感式FCL的参数是否满足在用户自定义值下限制故障电流的要求是很重要的。通过分析故障限流过程的暂态特性,推导出电感式fcl的临界激活时间。临界激活时间与系统电压额定值、fcl的电感以及用户选择的故障电流上限值或CB额定值有关。当激活时间小于临界时间时,故障电流可以限制在任意用户定义的值。该方程揭示了在中压系统中工作的电感式FCL在高压系统中可能无法将故障电流限制在一定值以下。电感式FCL在应用于特定电力系统之前,应根据该方程进行检查。仿真结果验证了上述结论。
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引用次数: 2
Marginal unit generation sensitivity and its applications in transmission congestion prediction and LMP calculation 边际发电灵敏度及其在输电拥塞预测和LMP计算中的应用
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772610
R. Bo, F. Li
Conventional optimization technique suggests that marginal unit generation sensitivity (MUGS) may be calculated based on perturbation at optimality. The calculated MUGS however only applies to the perturbed operating point. Often times it is not advisable to apply this local information to predict generations at another loading level with considerable load change, and therefore another calculation has to be performed to obtain the generation and its sensitivity at that loading level. It is of high interest to obtain a global pattern of the sensitivity in a wider range of loading levels, which bears great potential in applications such as congestion prediction and LMP calculation. Existing work have shown MUGS can be well approximated by a linear function of load. In this paper, explicit formulations are derived for some special cases and show that MUGS is precisely a linear function or constant in those cases. The usefulness of MUGS is demonstrated with two applications, congestion prediction and LMP (sensitivity) calculation. Based on MUGS, optimal load shift factor (OLSF) is proposed to facilitate predicting future binding constraints such as transmission congestions. As a function of MUGS, LMP and its sensitivity can be easily obtained.
传统的优化方法认为边际发电灵敏度(MUGS)是基于最优摄动计算的。然而,所计算的MUGS仅适用于扰动工作点。通常情况下,不建议应用这些局部信息来预测在另一个负荷水平下具有相当大的负荷变化的代,因此必须执行另一个计算来获得该负荷水平下的代及其灵敏度。在更大的负载水平范围内获得灵敏度的全局模式是一个非常重要的问题,它在拥塞预测和LMP计算等应用中具有很大的潜力。现有的工作表明,MUGS可以很好地近似为负载的线性函数。本文给出了一些特殊情况下的显式表达式,并证明了在这些情况下MUGS是一个精确的线性函数或常数。通过两个应用,拥塞预测和LMP(灵敏度)计算,证明了MUGS的实用性。在MUGS的基础上,提出了最优负荷转移因子(OLSF)来预测未来的约束条件,如传输拥塞。作为MUGS的函数,LMP及其灵敏度可以很容易地得到。
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引用次数: 3
Grid connected DC distribution system for efficient integration of sustainable energy sources 并网直流配电系统对可持续能源的有效整合
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772623
M. Elshaer, A. Mohamed, O. Mohammed
In this paper, some of the aspects related to the design and implementation of grid connected DC microgrids are investigated. A prototype system has been designed and implemented to address these aspects. The described system is dependent mainly on sustainable energy sources. Hence, a special care has been given to dealing with these kinds of sources while designing different components of the system. Certain features had to be maintained in the system in order to assure efficient integration of different sources, efficient and reliable load-feeding capability and full controllability of voltage and power flow among various buses in the system. Moreover, a fully controlled rectifier has been designed to tie the DC grid with the AC one. A vector decoupling controlled sinusoidal pulse width modulation (SPWM) technique has been used to allow the designed rectifier to maintain a constant output voltage while being able to control the active and reactive power drawn from the grid independently. Both simulation and experimental results verify the validity of the proposed system.
本文研究了与并网直流微电网设计和实现有关的一些问题。已经设计并实现了一个原型系统来解决这些问题。所描述的系统主要依赖于可持续能源。因此,在设计系统的不同组件时,要特别注意处理这些类型的源。为了保证不同电源的有效集成、高效可靠的负载馈电能力以及系统中各母线之间电压和潮流的完全可控性,系统必须保持某些特征。此外,还设计了一个完全可控的整流器,将直流电网与交流电网连接起来。采用矢量解耦控制的正弦脉宽调制(SPWM)技术,使所设计的整流器能够保持恒定的输出电压,同时能够独立控制从电网吸取的有功和无功功率。仿真和实验结果验证了该系统的有效性。
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引用次数: 16
“Recent feature additions and changes in CIM” — Kendall Demaree, Alstom Grid “CIM的最新特性添加和更改”- Kendall Demaree, Alstom Grid
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772506
K. Demaree
This talk will address some of the specific areas of addition or change and their state of integration into the CIM standards. We will provide commentary upon and a road map into various activities, models, model management practices, and trends that have recently emerged. Highlights include: System planning models, Dynamic simulation models, Distribution models, Unbalanced models, Network analysis solutions, DC transmission models, Transformer models, Operational limits models, Control area specifications, Naming and Identity, SCADA measurement models, Cuts and jumpers models, Metering models, Wind models, The role of UML supporting interfaces, profiles, profile groups, CIM UMLversioning, CIM instance data segregation, CIM UML and its relation to time, modifications, instance data changes, Policies such as SI units, UML naming conventions, patterns, "Informative" models and relationship to testing and validation, Relation to other standards such as IEC61850, MultiSpeak, Priority topics for latest CIM standards, Trends into the future
本演讲将讨论一些添加或更改的特定领域,以及它们集成到CIM标准中的状态。我们将提供对各种活动、模型、模型管理实践和最近出现的趋势的评论和路线图。亮点包括:系统规划模型、动态仿真模型、配电模型、非平衡模型、网络分析解决方案、直流输电模型、变压器模型、运行极限模型、控制区域规范、命名与标识、SCADA测量模型、切跳模型、计量模型、风模型、UML支持接口的作用、配置文件、配置文件组、CIM UMLversioning、CIM实例数据分离、CIM UML及其与时间的关系、修改、实例数据更改、SI单位等策略、UML命名约定、模式、“信息性”模型以及与测试和验证的关系、与其他标准的关系,如IEC61850、MultiSpeak、最新CIM标准的优先主题、未来趋势
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引用次数: 0
Multivariable control strategy for autonomous operation of a converter-based distributed generation system 基于变流器的分布式发电系统自主运行多变量控制策略
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772603
Afsoon Nejati, A. Nobakhti, H. Karimi
This paper presents a control strategy for the autonomous (islanded) operation of a distributed generation (DG) unit. The DG unit supplies a balanced load through a voitage-sourced converter (VSC). To maintain the autonomous operation in the islanded mode, the DG unit should provide its dedicated load with a sinusoidal voltage with a constant magnitude and a constant frequency. The dynamic model of the islanded DG system is represented by a set of nonlinear equations. Since the objective is to regulate voltage and frequency of the islanded DG about their rated values, the nonlinear model is linearized about the operating point. The obtained linearized model represents a multivariable LTI system with the converter voltages as the inputs, and the load voltage magnitude and frequency as the outputs. Based on the Nyquist array method, a controller is designed to achieve the objectives for the islanded system. To verify the effectiveness of the proposed control strategy, a set of nonlinear simulation case studies are carried out in the MATLAB/SimPowerSystems toolbox. In particular, the performance of the proposed controller with respect to the reference signal tracking and the load resistance perturbations is verified. The simulation results show that the proposed control strategy offers a good robust tracking/performance properties.
提出了一种分布式发电机组自主(孤岛)运行的控制策略。DG单元通过电压源转换器(VSC)提供平衡负载。为了保持孤岛模式下的自主运行,DG机组应向其专用负载提供恒幅恒频的正弦电压。孤岛DG系统的动力学模型由一组非线性方程表示。由于目标是将孤岛DG的电压和频率调节到额定值左右,因此非线性模型对工作点进行了线性化。所得到的线性化模型表示一个以变换器电压为输入,负载电压幅值和频率为输出的多变量LTI系统。基于奈奎斯特阵列方法,设计了一种控制器来实现孤岛系统的目标。为了验证所提出的控制策略的有效性,在MATLAB/SimPowerSystems工具箱中进行了一组非线性仿真案例研究。特别地,验证了所提控制器在参考信号跟踪和负载电阻摄动方面的性能。仿真结果表明,该控制策略具有良好的鲁棒跟踪性能。
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引用次数: 3
Market-based transmission expansion planning 市场化输电扩容规划
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772507
Yang Gu, J. McCalley
This paper presents a market-based transmission expansion planning model and compares it with a traditional reliability-based transmission planning model. Reliability-based transmission planning tries to install new lines at minimal cost while fulfilling system reliability criteria. Market-based transmission planning, on the other hand, seeks investment opportunities so that network expansions can generate more economic benefits than the costs. Benders decomposition technique is employed in both methods, and their master problems and slave problems are compared, respectively. The two models are applied on a five-bus system and a thirty-bus system. The results show that the market-based transmission planning method is better in terms of relieving system congestions, enhancing market efficiency and reducing load payments. The scalability of the market-based transmission planning algorithm is also discussed in this paper.
提出了一种基于市场的输电扩容规划模型,并与传统的基于可靠性的输电规划模型进行了比较。基于可靠性的输电规划试图在满足系统可靠性标准的同时,以最小的成本安装新的线路。另一方面,基于市场的输电规划寻求投资机会,使网络扩展产生的经济效益大于成本。两种方法都采用了弯曲分解技术,并分别对其主问题和从问题进行了比较。这两种模型分别应用于5总线系统和30总线系统。结果表明,市场化输电规划方法在缓解系统拥堵、提高市场效率和降低负荷支付方面具有较好的效果。本文还讨论了基于市场的输电规划算法的可扩展性。
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引用次数: 13
An evaluation of the NaS battery storage potential for providing regulation service in California NaS电池在加州提供监管服务的潜力评估
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772494
N. Lu, M. Weimar, Y. Makarov, C. Loutan
Sodium sulfur (NaS) batteries can provide energy storage, real-time dispatch, regulation, frequency response, and other essential services to the power grids. This study presents the technical characteristics, modeling approach, methodologies, and results for providing regulation services in the California Independent System Operator (CAISO) market. Two different scenarios were studied and compared: a scenario without intermittent renewable-energy resource penetration (base case) and a scenario with significant renewable-energy resource penetration (including wind) reaching 20% of CAISO's energy supply. In addition, breakeven cost analyses were developed for four cases. Based on the results of the technical and cost analyses, the opportunities for the NaS battery providing the regulation services are discussed, design improvements for the battery's physical characteristics are recommended, and modifications of the regulation signals sent to NaS batteries are proposed.
钠硫(NaS)电池可以为电网提供能量存储、实时调度、调节、频率响应和其他基本服务。本研究提出了在加州独立系统运营商(CAISO)市场提供监管服务的技术特征、建模方法、方法和结果。研究并比较了两种不同的情景:一种是没有间歇性可再生能源渗透的情景(基本情景),另一种是可再生能源渗透(包括风能)达到CAISO能源供应20%的情景。此外,还对四种情况进行了盈亏平衡成本分析。根据技术和成本分析的结果,讨论了NaS电池提供调节服务的机会,提出了改进电池物理特性的设计建议,并提出了修改发送给NaS电池的调节信号的建议。
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引用次数: 24
A novel approach to dynamic stability enhancement using PID damped fuzzy susceptance controlled SVC 一种基于PID阻尼模糊电纳控制的SVC动态稳定性增强新方法
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772445
D. Harikrishna, R. S. Dhekekar, N. Srikanth
This paper presents a novel approach to dynamic stability enhancement using PID damped fuzzy susceptance controlled static VAR compensator (SVC). Static VAR compensator is proven the fact that it improves the dynamic stability of power systems apart from reactive power compensation; it has multiple roles in the operation of power systems. The additional auxiliary control signals to SVC play a very important role in mitigating the rotor electromechanical low frequency oscillations. A proportional-integral-derivative (PID) type controller is designed using the generator speed deviation, as a modulated signal to SVC, to generate the desired damping, is proposed in this paper. The fuzzy logic controller is considered to generate the required incremental firing angle delays for SVC. The simulations are carried out for multi-machine power system at different operating conditions.
提出了一种利用PID阻尼模糊电纳控制静态无功补偿器(SVC)增强系统动态稳定性的新方法。静态无功补偿器除了对电力系统进行无功补偿外,还能提高电力系统的动态稳定性;它在电力系统的运行中具有多重作用。附加的辅助控制信号对抑制转子机电低频振荡起着非常重要的作用。本文设计了一种比例-积分-导数(PID)型控制器,利用发电机转速偏差作为SVC的调制信号,产生所需的阻尼。考虑模糊控制器产生SVC所需的增量发射角延迟。对不同工况下的多机电力系统进行了仿真。
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引用次数: 11
Existing transmission charging practices in India: Discouraging for power market 印度现有的输电收费做法:对电力市场不利
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772442
Niranjan Kumar, Y. Reddy, D. Das, N. Padhy
The changing structure of the electricity supply industry is bringing transmission charging into a new focus. Transmission charging evaluation is a complex task and becomes important after introducing the competition into the power market. The existing transmission charging practices in India is based on regional postage stamp basis. The development of power market in India is in its initial stage, so flow based method for transmission charging might be suitable for Indian context.
电力供应行业结构的变化使输电充电成为一个新的焦点。输电收费评估是一项复杂的任务,在电力市场引入竞争机制后变得十分重要。印度现有的输电收费做法是以地区邮票为基础的。印度电力市场的发展处于起步阶段,基于流量的输电充电方法可能更适合印度国情。
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引用次数: 4
Capacity standardization of shunt power reactors in Mexico 墨西哥并联电抗器容量标准化
Pub Date : 2011-03-20 DOI: 10.1109/PSCE.2011.5772477
J. Quintana, F. Ibarra
The present work presents a proposal to standardize the capacity of shunt power reactors used to compensate the majority of the 400 kV transmission lines in the transmission grid of Mexico. This work is based on an analysis of the power reactor ratings that historically has been used in Mexico's transmission grid, the physical and electrical characteristics of the transmission towers where power reactors are installed, as well as the limits of the maximum ovelvoltages for maintaining a secure and reliable operation of the transmission system.
本文提出了对墨西哥输电网中用于补偿大部分400千伏输电线路的并联电抗器容量进行标准化的建议。这项工作是基于对墨西哥输电网历史上使用的电力反应堆额定值的分析,安装电力反应堆的输电塔的物理和电气特性,以及维持输电系统安全可靠运行的最大电压限制。
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引用次数: 0
期刊
2011 IEEE/PES Power Systems Conference and Exposition
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