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Operative Factors Affecting Energy Balancing and Speed of Equalization in Battery Storage System 影响蓄电池储能系统能量均衡和均衡速度的操作因素
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598279
O. Palizban, K. Kauhaniemi
Energy storage systems play a significant role in power management systems and control of the modern grid. One of the most challenging issues is controlling storage units in distributed form. This paper presents a possible means of controlling Energy Storage Systems (ESS) through a decentralized approach. Moreover, the balancing and equalization of stored energy in different storage units presents other challenges in such systems; to deal with this, the paper discuss here the factors that affect energy balancing and the speed of the energy balance convergence. A Proportional-Integral (PI) controller is used in the upper control level to generate an accurate reference value for the State of Charge (SoC), and a modified droop control is employed on the lower control level to equalize the energy on the basis of the SoC. To evaluate the control algorithm and to investigate the factors that affect the speed of equalization, this paper considers the result of a case study with three battery storage units.
储能系统在现代电网的电力管理和控制中占有重要地位。最具挑战性的问题之一是控制分布式形式的存储单元。本文提出了一种通过分散方法控制储能系统(ESS)的可能方法。此外,在这种系统中,不同存储单元中存储能量的平衡和均衡提出了其他挑战;针对这一问题,本文讨论了影响能量平衡的因素和能量平衡收敛的速度。上层控制层采用比例积分(PI)控制器生成准确的荷电状态(SoC)参考值,下层控制层采用改进的下垂控制,在荷电状态的基础上实现能量均衡。为了评估控制算法并研究影响均衡速度的因素,本文考虑了三个电池存储单元的案例研究结果。
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引用次数: 0
Fault-Observability Enhancement in Distribution Networks Using Power Quality Monitors 利用电能质量监测器增强配电网的故障可观测性
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598287
Ehsan Davari-nejad, A. Ameli, E. El-Saadany
As far as continuous supply and reliable power delivery to the distribution system customers are concerned, finding a practical and cost-effective method for locating faults after their occurrence is of high importance. In this study, a method is proposed to determine the optimal number and location of power quality monitors (PQMs) to make the distribution network fault-observable, that means, to be able to locate faults as precisely as possible. Moreover, as placement of PQMs is highly dependent on the network topology, the proposed method considers the most probable configurations of the network for optimization. The error of measuring equipment and its effect on number of PQMs is also taken into consideration. The defined objective functions of this study aim to minimize the cost of installing PQMs while minimizing the number of blind-pairs and maximizing the fault-observability level of the network. These objective functions are optimized using Multi-Objective Particle Swarm Optimization (MOPSO) technique. Additionally, to have a better economic evaluation, two scenarios are defined based on the accuracy class of monitoring equipment. The effectiveness of the proposed method is corroborated using simulation results for the IEEE 123-bus distribution test system.
为了保证配电系统用户的持续供电和可靠供电,寻找一种实用、经济的故障后定位方法具有重要意义。本文提出了一种确定电能质量监测仪(pqm)的最佳数量和位置的方法,使配电网故障可观测,即能够尽可能精确地定位故障。此外,由于pqm的放置高度依赖于网络拓扑结构,因此所提出的方法考虑最可能的网络配置进行优化。同时考虑了测量设备的误差及其对PQMs数的影响。本研究定义的目标函数是使pqm的安装成本最小化,同时使盲对数量最小化,使网络的故障可观察性水平最大化。利用多目标粒子群优化技术对目标函数进行优化。此外,为了更好地进行经济评估,根据监测设备的精度等级定义了两种场景。通过对IEEE 123总线配电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: 0
Detection of False Data Injection Attacks in Automatic Generation Control Systems Considering System Nonlinearities 考虑系统非线性的自动生成控制系统中假数据注入攻击检测
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598328
Abdelrahman Ayad, Mohsen Khalaf, E. El-Saadany
Maintaining the power system frequency around its nominal value is a very critical issue for the system stability. This operation is performed by the Automatic Generation Control (AGC) system. A cyber attack on the AGC system may affect the whole stability and economic operation of the power system. This paper proposes a method using Recurrent Neural Networks to detect False Data Injection (FDI) attacks in AGC systems. The novelty of this work over other approaches is that the nonlinearities of the AGC system are considered, which make it difficult to use the conventional approaches to detect FDI in case of considering the nonlinearities. The AGC of a two-area power system is used and the results show that the proposed approach succeeded to detect FDI in AGC system with an accuracy of 94%.
维持电力系统频率在其标称值附近是一个非常关键的问题,它关系到系统的稳定性。该操作由AGC (Automatic Generation Control)系统执行。对AGC系统的网络攻击可能会影响整个电力系统的稳定性和经济运行。提出了一种利用递归神经网络检测AGC系统中虚假数据注入(FDI)攻击的方法。与其他方法相比,这项工作的新颖之处在于考虑了AGC系统的非线性,这使得在考虑非线性的情况下难以使用传统方法来检测FDI。实验结果表明,该方法能有效地检测出两区电力系统中的FDI,准确率达94%。
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引用次数: 12
Development of a gas hydrate power generation system for cold district using low temperature heat emission 低温放热冷区天然气水合物发电系统的研制
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598301
Y. Uemura, Shuhei Obara, T. Kawasaki
Since the electricity demand and the thermal demand in the cold district are large compared to the warm region, so emission of greenhouse gases by mass consumption of fossil fuels becomes a problem. For this reason, it is necessary to construct an energy system based on renewable energy. This research proposes a power generation system that utilizes unique state change characteristics by thermal cycle of carbon dioxide hydrate. The energy necessary for operating the proposed system is only heat, outside air temperature (low temperature heat source) is used in cold areas in winter, low temperature heat emission (high temperature heat source) of buildings and factories is used. In the trial system, electricity is obtained from the pressure difference during the phase change of CO2gas hydrate by the scroll type expander. In this paper, it is expected that the power generation efficiency reaches 11.8% by appropriately using the heat exchanger which is the reaction vessel of the prototype system.
由于寒冷地区的电力需求和热需求比温暖地区大,因此大量使用化石燃料排放温室气体成为一个问题。因此,有必要构建以可再生能源为基础的能源体系。本研究提出了一种利用二氧化碳水合物热循环的独特状态变化特性的发电系统。系统运行所需要的能量仅为热能,冬季寒冷地区使用室外空气温度(低温热源),建筑物和工厂使用低温放热(高温热源)。在试验系统中,通过涡旋式膨胀机从co2气体水合物相变时的压差中获得电能。本文通过对作为原型系统反应容器的热交换器的合理利用,期望发电效率达到11.8%。
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引用次数: 0
Design of a Switched Reluctance Motor for a Pump Jack Application 泵千斤顶用开关磁阻电机的设计
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598295
Ehab Sayed, Peter Azer, M. Kordic, J. Reimers, B. Bilgin, M. Bakr, A. Emadi
This paper discusses the design of a switched reluctance motor (SRM) for pump jacks that are commonly used in oil extraction industry. An SRM is designed as an alternative to a 10-hp induction motor. It is designed to have the same volume so it can utilize the same NEMA frame. Optimization through the number of turns per phase, stator and rotor pole arc angles, and conduction angles is carried out. Selection of conduction angles for the motor drive is based on a multi-objective constrained genetic algorithm optimization to achieve the required torque with the same phase current as the reference induction machine. Thermal analysis of the proposed machine is conducted to demonstrate its suitability for extended continuous operation.
本文讨论了采油工业中常用的泵千斤顶用开关磁阻电机的设计。SRM被设计为10马力感应电动机的替代方案。它被设计成具有相同的体积,因此它可以利用相同的NEMA框架。通过每相匝数、定子和转子极弧角、导通角进行优化。电机驱动导通角的选择基于多目标约束遗传算法优化,以获得与参考感应电机相同的相电流下所需转矩。对所提出的机器进行了热分析,以证明其适合长时间连续运行。
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引用次数: 4
A Very Deep One Dimensional Convolutional Neural Network (VDOCNN) for Appliance Power Signature Classification 一种非常深一维卷积神经网络(VDOCNN)用于电器功率特征分类
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598355
P. Dash, Kshirasagar Naik
Estimating appliance specific power consumption using a single measuring device, known as Non-Intrusive Load Monitoring (NILM), is a challenging Blind Signal source Separation (BSS) problem. For the past two decades, numerous mathematical and pattern recognition techniques, including Fractional Hidden Markov Model (FHMM), Gaussian Mixture Model (GMM) and Mean Shift Based Clustering Techniques (MSBCT) have been proposed to decompose the total power consumption of a household into appliance specific power signals. The measurement sampling rate, operating characteristic of individual appliances and an unknown number of mixed signals create a big challenge in separating them. The main challenge is to design an algorithm that can learn appliance features accurately, before applying the algorithm to disaggregate the main power signals. To address this problem, A Very Deep One dimensional Convolutional Neural Network (VDOCNN) for appliance power signature classification is proposed in this research. As a first step, we have applied VDOCNN in learning appliance features from a given set of labeled training data. VDOCNN has achieved accuracy up to 98% in detecting appliance from its power signature using a UK Domestic Appliance-Level Electricity (UK-DALE) dataset. Using this algorithm, we are working towards disaggregation of power signatures for different appliances from a single power signal in future research.
使用非侵入式负载监测(NILM)这一单一测量设备估算电器特定功耗是一个具有挑战性的盲信号源分离(BSS)问题。在过去的二十年里,许多数学和模式识别技术,包括分数阶隐马尔可夫模型(FHMM)、高斯混合模型(GMM)和基于均值偏移的聚类技术(MSBCT),已经被提出将家庭总功耗分解为特定的电器功率信号。测量采样率、单个设备的工作特性和未知数量的混合信号给分离它们带来了很大的挑战。主要的挑战是设计一种算法,在应用该算法分解主要电源信号之前,可以准确地学习设备特征。为了解决这一问题,本研究提出了一种用于家电功率特征分类的甚深一维卷积神经网络(VDOCNN)。作为第一步,我们将VDOCNN应用于从一组给定的标记训练数据中学习设备特征。使用英国家用电器级电力(UK- dale)数据集,VDOCNN在从其功率特征检测电器方面达到了高达98%的准确率。利用该算法,我们将在未来的研究中从单个电源信号中分解出不同设备的功率特征。
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引用次数: 11
Optimization Approaches to Distribution System State Estimation for Optimal Meter Placement 配电系统电表最优配置状态估计的优化方法
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598297
Sreedevi Valsan Kandenkavil, Kankar Bhattacharya
State estimation is widely used in power transmission systems for obtaining a real time network model where measurements of bus voltages and line power flows are available. On the other hand, in distribution systems, with limited availability of measurements, and additional measurements being expensive, careful selection of location for the placement of meters becomes important. The measurement meters typically considered are phasor measurement units (PMUs) and power (PQ) meters. In this work, optimization based approaches are proposed to address the optimal meter placement problem considering different objectives such as minimization of cost, weighted least square (WLS) residual estimate, and a multi-objective function comprising cost and WLS, and the average root mean square error (ARMSE) of the estimated state vector. The various optimization models are tested on a 33-bus distribution feeder, and compared based on meter placement cost and ARMSE of voltage estimates.
状态估计被广泛应用于输电系统中,以获得实时的网络模型,其中母线电压和线路潮流的测量是可用的。另一方面,在配电系统中,由于测量的可用性有限,而且额外的测量费用昂贵,因此仔细选择安装仪表的位置变得很重要。通常考虑的测量仪表是相量测量单元(pmu)和功率(PQ)仪表。在这项工作中,提出了基于优化的方法来解决最优仪表放置问题,考虑了不同的目标,如成本最小化,加权最小二乘(WLS)残差估计,以及包含成本和WLS的多目标函数,以及估计状态向量的平均均方根误差(ARMSE)。在33总线配电馈线上对各种优化模型进行了测试,并基于仪表放置成本和电压估计的ARMSE进行了比较。
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引用次数: 2
Damping Power Oscillations in the Inverter-Dominated Microgrid 在逆变器主导的微电网中阻尼功率振荡
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598339
H. Lahiji, J. Mohammadi, F. B. Ajaei, Ryan E. Boudreau
An improved Proportional-Derivative (PD) droop control strategy is proposed in this paper for stable operation and improved disturbance response of the islanded inverter-dominated AC microgrid. The proposed strategy (i) is simple and easy to implement., (ii) does not require communication between distributed energy resources, and (iii) significantly improves microgrid dynamic response and stability. Performance of the proposed improved PD droop control strategy is investigated using a detailed and realistic study system, and its effectiveness is verified using extensive simulation studies in the PSCAD/EMTDC software. The study results indicate that the proposed control strategy enables effective voltage and frequency regulation, i.e., limited deviations, in the inverter-dominated microgrid without causing power oscillations between inverters.
针对孤岛型逆变器控制的交流微电网,提出了一种改进的比例导数下垂控制策略。建议的策略(一)简单易行。(ii)不需要分布式能源之间的通信,(iii)显著提高微电网的动态响应和稳定性。通过详细的仿真研究系统对改进后的PD下垂控制策略进行了性能研究,并在PSCAD/EMTDC软件中进行了大量仿真研究,验证了其有效性。研究结果表明,所提出的控制策略能够在逆变器主导的微电网中有效地调节电压和频率,即限制偏差,而不会引起逆变器之间的功率振荡。
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引用次数: 5
Investigation of Price-Feature Selection Algorithms for the Day-Ahead Electricity Markets 日前电力市场价格特征选择算法研究
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598282
Radhakrishnan Angamuthu Chinnathambi, Mitch Campion, A. S. Nair, P. Ranganathan
This paper investigates three types of feature selection techniques such as relative importance using Linear Regression (LR), Multivariate Adaptive Regression Splines (MARS), and Random forest (RF) to reduce the forecasts error for the hourly spot price of the Iberian electricity markets. Two pricing datasets of durations three and six months were used to validate the performance of the model. Three different set of features (17, 4, 2) for three and six months duration were used in this study. These selected features were applied to the two-stage hybrid model such as ARIMA-GLM, ARIMA-SVM, and ARIMA- RF. Finally, three variables (or features) that are commonly matched were selected and tested. Considerable reduction in Mean Absolute Percentage Errors (MAPE) values were observed for both three and six-month datasets.
本文利用线性回归(LR)、多元自适应回归样条(MARS)和随机森林(RF)等三种类型的特征选择技术,研究了相对重要性,以减少伊比利亚电力市场小时现货价格的预测误差。两个持续时间为3个月和6个月的定价数据集被用来验证模型的性能。本研究中使用了3个月和6个月的三组不同的特征(17,4,2)。将这些特征应用于两阶段混合模型,如ARIMA- glm、ARIMA- svm和ARIMA- RF。最后,选择三个通常匹配的变量(或特征)并进行测试。在3个月和6个月的数据集中,平均绝对百分比误差(MAPE)值均显著降低。
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引用次数: 4
Increasing Renewable Energy Penetration through Strategic Deployment of IoT Devices 通过物联网设备的战略部署提高可再生能源的渗透率
Pub Date : 2018-10-01 DOI: 10.1109/EPEC.2018.8598288
T. Chu, Alejandro Mayoral-Banos, S. Chen, R. Hartani
Renewable energy penetration can be increased by the use of IoT connected devices. The focus of optimization should be less on individual devices, but rather on the networked effect of millions of devices together. By implementing global optimization on electrical loads, it may be possible to eliminate the need for fossil fuel-based electricity generation in certain jurisdictions.
可再生能源的渗透率可以通过使用物联网连接设备来提高。优化的重点不应该放在单个设备上,而应该放在数百万台设备的网络效应上。通过对电力负荷进行全局优化,有可能在某些司法管辖区消除对化石燃料发电的需求。
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引用次数: 0
期刊
2018 IEEE Electrical Power and Energy Conference (EPEC)
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