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2017 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)最新文献

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Situational awareness in an electric utility's control center of its generators' damping capabilities 电力公司控制中心对发电机阻尼能力的态势感知
Paranietharan Arunagirinathan, G. Venayagamoorthy
Poorly damped low frequency oscillations in power systems have led to system blackouts in the past. Power system stabilizers (PSSs) are installed to improve synchronous generator's oscillation damping capabilities. PSS parameter tuning by various traditional and new optimization methods are studied to ensure stable and secure operation of interconnected power systems with uncertainties. It is imperative to evaluate the tuned PSSs with the different methods to ensure continued security of a power system during operation. There is a lack of such situational awareness at electric utility control centers to assist system operators with the knowledge of synchronous generator's oscillation damping capabilities. Since the human brain responses to images and colors faster compared to text and numbers, it is desirable to develop advanced visualizations and avail them to system operators. These visualizations could utilize real-time data from phasor measurement units. This paper presents the development of a new tool for use in control centers for modal analysis visualization (MAV). Modal analysis is performed on oscillations exhibited by generators in a power system. The MAV enhances situational awareness at control centers by providing near real-time insight into generators' oscillation damping capabilities.
在过去,电力系统中阻尼不良的低频振荡导致了系统停电。电力系统稳定器(pss)的安装是为了提高同步发电机的振荡阻尼能力。研究了各种传统和新型优化方法对PSS参数的整定,以保证具有不确定性的互联电力系统的稳定安全运行。为了保证电力系统在运行过程中的持续安全,有必要采用不同的方法对调整后的pss进行评估。电力控制中心缺乏这种态势感知能力,无法帮助系统操作员了解同步发电机的振荡阻尼能力。由于人脑对图像和颜色的反应比文本和数字要快,因此开发先进的可视化并将其用于系统操作员是可取的。这些可视化可以利用相量测量单元的实时数据。本文介绍了一种用于控制中心模态分析可视化(MAV)的新工具的开发。对电力系统中发电机的振动进行了模态分析。MAV通过提供近乎实时的发电机振荡阻尼能力,增强了控制中心的态势感知能力。
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引用次数: 4
Analysis of contribution from solar generators for short circuit in an urban distribution system 太阳能发电机对城市配电系统短路的贡献分析
S. Matos, L. Encarnação, C. Donadel
The current distribution systems and power transmission are designed with a power flow characteristic flowing from the source to the load at all times. From the dissemination and use in larger-scale distributed generators, questions arise as to the operation of current protection systems. This article aims to analyze the contribution to the short circuit of a solar generator connected to an urban power grid, to support an analysis of the cur — action of the protections currently installed, they do not consider the installation of new generators coming to consumers.
电流分配系统和电力传输的设计具有从电源到负载的潮流特征。由于在大型分布式发电机中的推广和使用,对现有保护系统的操作产生了问题。本文旨在分析连接到城市电网的太阳能发电机短路的贡献,以支持当前安装的保护措施的分析,他们没有考虑安装新的发电机给消费者。
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引用次数: 1
PReSS towards a secure smart grid: Protection recommendations against smart spoofing 向安全智能电网推进:针对智能欺骗的保护建议
Charith Wickramaarachchi, R. Kannan, C. Chelmis, V. Prasanna
Protecting the integrity of state estimates that inform the physical state of a power transmission network is vital for the safe operation. Existing methods to protect the critical state estimates in smart-grid against data spoofing attacks assume a static set of critical buses. Instead, we propose a generalized optimal protection scheme based on a prize-collecting Steiner tree formulation that captures the criticality of buses and protection cost. We argue that the criticality of buses can change over time, and present a set of optimal schemes for adaptive protection against data spoofing attacks in smart grids. Next, we note that such optimal schemes are computationally intractable and propose heuristics with polynomial time complexity. We evaluate the proposed protection schemes using simulations on publicly available transmission network datasets. Simulation results show that the proposed heuristics closely approximate the optimal results while being able to scale for large transmission networks.
保护反映输电网物理状态的状态估计的完整性对输电网的安全运行至关重要。现有保护智能电网中关键状态估计免受数据欺骗攻击的方法假设了一组静态的关键总线。相反,我们提出了一种基于奖励收集斯坦纳树公式的广义最优保护方案,该方案捕获了总线的临界性和保护成本。我们认为总线的临界性可以随着时间的推移而变化,并提出了一套针对智能电网中数据欺骗攻击的自适应保护的最佳方案。接下来,我们注意到这种最优方案在计算上是难以处理的,并且提出了具有多项式时间复杂度的启发式方法。我们使用公开可用的传输网络数据集模拟来评估提出的保护方案。仿真结果表明,所提出的启发式算法接近最优结果,同时能够适应大型传输网络。
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引用次数: 2
Experimental evaluation of grid support enabled PV inverter response to abnormal grid conditions 电网支持下光伏逆变器对异常电网条件响应的实验评估
A. Nelson, G. Martin, James Hurtt
As revised interconnection standards for grid-tied photovoltaic (PV) inverters address new advanced grid support functions (GSFs), there is increasing interest in inverter performance in the case of abnormal grid conditions. The growth of GSF-enabled inverters has outpaced the industry standards that define their operation, although recently published updates to UL1741 Supplement SA define test conditions for GSFs such as volt-var control, frequency-watt control, and voltage/frequency ride-through, among others. This paper describes the results of a comparative experimental evaluation on four commercially available, three-phase PV inverters in the 24.0–39.8 kVA power range on their GSF capability and its effect on abnormal grid condition response. The evaluation examined the impact particular GSF implementations have on run-on times during islanding conditions, peak voltages in load rejection overvoltage scenarios, and peak currents during single-phase and three-phase fault events for individual inverters. Testing results indicated a wide variance in the performance of GSF enabled inverters to various test cases.
随着并网光伏(PV)逆变器的修订互联标准解决了新的先进电网支持功能(gsf),人们对异常电网条件下逆变器性能的兴趣日益增加。支持gsf的逆变器的增长速度超过了定义其运行的行业标准,尽管最近发布的UL1741补充SA更新定义了gsf的测试条件,如电压无功控制、频率瓦特控制和电压/频率穿越等。本文介绍了在24.0 ~ 39.8 kVA功率范围内,对4种市售三相光伏逆变器的GSF能力及其对电网异常状态响应的影响进行对比实验评估的结果。评估检查了特定GSF实施对孤岛条件下的运行时间、负载抛弃过电压情况下的峰值电压以及单个逆变器单相和三相故障事件时的峰值电流的影响。测试结果表明,在各种测试用例中,支持GSF的逆变器的性能差异很大。
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引用次数: 13
Location identification of high impedance faults using synchronized harmonic phasors 基于同步谐波相量的高阻抗故障定位识别
M. Farajollahi, A. Shahsavari, Hamed Mohsenian Rad
This paper proposes a novel method to identify the location of a high-impedance fault (HIF) in a power distribution system. The developed method uses synchronized harmonic phasors with focus on the third harmonic component. Such harmonic synchrophasors could be provided in practice, e.g., by distribution level phasor measurement units, a.k.a, μPMUs. In this regard, the location of the fault can be estimated based on the impedance that is calculated from the third harmonic voltage and current synchrophasors produced by the fault and captured by the μPMUs. In this method, both resistance and inductance are estimated, to allow fault location identification even in a network with multiple type conductors. Note that, the fault does not need to be fully observable. As few as two μPMUs would be sufficient to estimate the HIF location at least to certain accuracy. The effectiveness of the proposed method is demonstrated through simulating the IEEE 33 bus test system in PSCAD.
提出了一种新的配电系统高阻抗故障定位方法。该方法采用同步谐波相量,重点关注三次谐波分量。这种谐波同步相量可以在实践中提供,例如,通过分布电平相量测量单位,即μ pmu。因此,可以通过μ pmu捕获故障产生的三次谐波电压和电流同步量计算阻抗来估计故障的位置。在该方法中,电阻和电感都进行了估计,即使在具有多种类型导体的网络中也可以进行故障定位。注意,故障不需要完全可见。只要两个μPMUs就足以估计HIF位置至少达到一定的精度。通过PSCAD对IEEE 33总线测试系统的仿真,验证了该方法的有效性。
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引用次数: 43
Impact of load and renewable energy uncertainties on single and multiple energy storage systems sizing 负荷和可再生能源不确定性对单个和多个储能系统规模的影响
Imane Biyya, G. Aniba, M. Maaroufi
This paper questions the impact of Renewable Energy Sources and load uncertainties on sizing Energy Storage Systems, as well as these uncertainties dynamics in a distributed configuration. Given the current energetic concern, the importance of the massive integration of renewable energies and storage systems, in number and kind, has become obvious. Nonetheless, demand matching with these two options is quite challenging inasmuch as renewable energy sources are significantly random and as storage systems are high-priced and imitate load and production uncertainties. For this purpose, herein we firstly used Gaussian Mixtures to model renewable energy outcome; secondly, we developed a probabilistic procedure to size Energy Storage Systems as an aggregated unit, and finally, we examined the impact of distributing generation on uncertainties of individual units. Simulations on real load and photovoltaic historical data show that uncertainties, with respect to rating power and energy, slightly increase in a non-linear fashion.
本文提出了可再生能源和负荷不确定性对储能系统规模的影响,以及这些不确定性在分布式配置中的动态影响。考虑到当前的能源问题,大规模整合可再生能源和存储系统在数量和种类上的重要性已经变得显而易见。然而,由于可再生能源具有显著的随机性,储能系统价格高昂,且模仿负荷和生产的不确定性,因此,与这两种选择相匹配的需求相当具有挑战性。为此,本文首先使用高斯混合模型对可再生能源产出进行建模;其次,我们开发了一个概率程序,将储能系统作为一个总体单元,最后,我们检查了分布发电对单个单元不确定性的影响。对实际负荷和光伏历史数据的仿真表明,相对于额定功率和能量,不确定性以非线性方式略有增加。
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引用次数: 5
Frequency dependent line modeling and equipment sizing for a transmission level wind farm integration 输电级风电场集成的频率相关线路建模和设备尺寸
A. Yazdani, M. Zarghami
Due to environmental impacts of traditional energy production, the integration of renewable energy in high volume has become more favorable. A series of analytical studies are required prior to integration of windfarms into the transmission system. For instance, equipment sizing and high voltage analysis are some of the crucial assessments. Equipment sizing in high voltage substation is done considering Transient Over Voltage (TOV) quantity that any device may tolerate due to experiencing surge and/or switching. The high elevation levels that windfarms are installed, make them more susceptible to TOVs related to lightning strikes. This paper focuses on sizing the required protecting devices in a windfarm interconnected to transmission system through a high voltage substation. The study methodology is suitable for fast transient analysis such as lightning analysis.
由于传统能源生产对环境的影响,可再生能源的大容量整合变得更加有利。在将风电场整合到输电系统之前,需要进行一系列的分析研究。例如,设备尺寸和高压分析是一些关键的评估。高压变电站的设备尺寸考虑到任何设备由于经历浪涌和/或开关而可能承受的瞬态过电压(TOV)量。风力发电场安装的高海拔水平使它们更容易受到雷击相关的tov的影响。本文重点研究了风电场通过高压变电站与输电系统互连所需保护装置的尺寸。该研究方法适用于闪电等快速瞬态分析。
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引用次数: 0
Selective scheduling: Controlling non-preemptive devices in smart grid environment 选择性调度:智能电网环境下对非抢占设备的控制
Nilotpal Chakraborty, E. Kalaimannan
Direct load control has been an efficient and effective load control mechanism under demand side management in smart grid. With this technique, consumers' energy consuming appliances are managed and controlled by central utility with the primary objective of load profiling and to reduce peak load demand. In this paper, we take up the problem of scheduling under peak load constraint for controllable appliances that allows them to be run on various energy consumption levels. The problem is a unique manifold optimization problem where before scheduling a device, we are required to select a specific power consumption level for it that would result in minimizing overall finishing time (delay minimization). We model this problem into two-dimensional bin packing problem and present mathematical programming formulation, while proving it to be NP-hard. We have obtained optimum solutions for 20 numbers of appliances using IBM ILOG CPLEX optimization solver. Further a number of approximation algorithms have been used to obtain solutions quickly.
负荷直接控制已成为智能电网需求侧管理下一种高效的负荷控制机制。利用该技术,消费者的能源消耗设备由中央公用事业公司管理和控制,其主要目标是负荷分析和减少峰值负荷需求。本文研究了可控制设备在不同能耗水平下运行的峰值负荷约束下的调度问题。这个问题是一个独特的流形优化问题,在调度设备之前,我们需要为它选择一个特定的功耗水平,从而最小化总体完成时间(延迟最小化)。我们将此问题建模为二维装箱问题,给出了数学规划公式,同时证明了它是np困难的。我们使用IBM ILOG CPLEX优化求解器获得了20种设备的最佳解决方案。此外,还使用了一些近似算法来快速求解。
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引用次数: 1
Simplified power flow modeling approach considering on-load tap changers 考虑有载分接开关的简化潮流建模方法
Sultan S. Alkaabi, H. Zeineldin, V. Khadkikar
This paper presents a simplified modeling approach for power flow equations considering on-load tap-changers (OLTCs). The modeling approach consists of only four active and reactive nodal power injections and line power flows equations, and treats the elements of Ybus admittance matrix as constant parameters. The transformer tap ratios are only included in the simplified four equations as control variables, and hence not included in the Ybus matrix. This modeling approach reduces significantly the total number of variables and thus improves the computational time performance. The proposed approach is applicable for any system that does not have tap changing transformers connected in two adjacent buses, or multiple tap changing transformers connected to one bus.
本文提出了一种考虑有载分接开关的潮流方程的简化建模方法。该建模方法仅包括4个有功和无功节点功率注入和线路功率流方程,并将Ybus导纳矩阵的元素作为常数参数。变压器分接比仅作为控制变量包含在简化的四个方程中,因此不包含在Ybus矩阵中。这种建模方法显著减少了变量的总数,从而提高了计算时间性能。所提出的方法适用于任何在相邻的两个母线上没有分接变换变压器,或多个分接变换变压器连接在一个母线上的系统。
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引用次数: 3
Design and optimization of RES based standalone hybrid system for remote applications 基于RES的独立混合系统的设计与优化
Priyanka, S. K. Bath, M. Rizwan
In the developing countries like India there are around 20% villages are not electrified yet. However, there is a lot of opportunity to harness the renewable energy sources at these locations. In this study a remote area of Haryana, India has been considered to fulfill the demand of a village using renewable energy sources. The proposed hybrid system consisting of solar photovoltaic, biomass, biogas and battery storage system is developed and presented. In addition, techno-economic analysis with greenhouse gas analysis has also been presented. The developed system has least net present cost, cost of energy with negligible green house gas emission.
在印度这样的发展中国家,大约有20%的村庄还没有通电。然而,在这些地方有很多利用可再生能源的机会。在本研究中,印度哈里亚纳邦的一个偏远地区被认为是为了满足一个村庄使用可再生能源的需求。提出了一种由太阳能光伏、生物质、沼气和电池储能系统组成的混合系统。此外,还提出了利用温室气体分析进行技术经济分析的方法。开发的系统具有最小的净当前成本,能源成本和可忽略不计的温室气体排放。
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引用次数: 6
期刊
2017 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)
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