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2017 Australasian Universities Power Engineering Conference (AUPEC)最新文献

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Three-dimension core loss analysis of transverse flux linear motor based on the improved Steinmetz equation 基于改进Steinmetz方程的横向磁通直线电机铁芯三维损耗分析
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282472
S. Q. Ali, H. Hasanien, S. Muyeen
This paper presents a novel three-dimension (3D) core loss analysis of the transverse flux linear motor (TFLM) with inner mover type based on the improved Steinmetz equation. For more accurate results, the magnetic flux waveforms of the motor are predicted by performing 3D finite element (FE) transient analysis. The stator phase winding is excited in the FE model and a good meshing is created in the model including a high density through the air gap. The winding is fed from a dc source via a single-phase full bridge inverter. The magnetic material is exposed to non-sinusoidal magnetic flux waveforms. The improved Steinmetz equation is applied to estimate the core losses. The Steinmetz parameters are determined by using the genetic algorithm (GA) technique. MATLAB GA optimization toolbox is used for this purpose. The transient analysis of the TFLM is performed using MagNet software. The total core losses are estimated in the 3D FE model. With this proposed improved Steinmetz equation, the core losses of the TFLM can be accurately estimated.
本文提出了一种基于改进Steinmetz方程的内动型横向磁通直线电机铁芯损耗的三维分析方法。为了获得更精确的结果,通过进行三维有限元(FE)瞬态分析来预测电机的磁通波形。在有限元模型中对定子相绕组进行激励,并通过气隙形成良好的网格,包括高密度。绕组由直流电源通过单相全桥逆变器馈电。磁性材料暴露在非正弦磁通波形中。采用改进的Steinmetz方程估计堆芯损耗。采用遗传算法(GA)确定了Steinmetz参数。MATLAB GA优化工具箱用于此目的。利用MagNet软件对TFLM进行了瞬态分析。在三维有限元模型中估计了堆芯总损耗。利用改进的Steinmetz方程,可以准确地估计TFLM的堆芯损耗。
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引用次数: 0
Powerful IEDs, ethernet networks and their effects on IEC 61850-based electric power utilities security 强大的简易爆炸装置,以太网网络及其对基于IEC 61850的电力公用事业安全的影响
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282415
A. Hadbah, Akhtar Kalam, A. Zayegh
Smart Electric Power Utilities, this paper provides an overview of cyber security issues and their effects on the modern power communication system that is based on the IEC 61850 Standard. In addition, a summary of IEC 61850 and its data structures is also presented. This paper discusses and examines some of the security measures and algorithms that are used as a defence mechanism against cyber threats targeted at critical infrastructure control and its protection functions. The impact of authentication either by cipher blocks or hashing on GOOSE and SVM performance was also examined. A minimal impact on the performance constraints of GOOSE and SVM messages was observed, but this finding is inconclusive as the study was carried out on desktop computers mimicking IEDs. To confirm the findings similar studies must be carried out on IEDs or embedded devices such as the ones employed in a real substation.
智能电力公用事业,本文概述了网络安全问题及其对基于IEC 61850标准的现代电力通信系统的影响。此外,还对IEC 61850标准及其数据结构进行了概述。本文讨论并研究了一些安全措施和算法,这些措施和算法被用作防御针对关键基础设施控制及其保护功能的网络威胁的防御机制。还研究了密码块或哈希认证对GOOSE和SVM性能的影响。观察到GOOSE和SVM消息对性能约束的影响最小,但这一发现是不确定的,因为研究是在模拟ied的台式计算机上进行的。为了证实这一发现,必须对简易爆炸装置或嵌入式装置(如实际变电站中使用的装置)进行类似的研究。
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引用次数: 6
Evaluation of single-and three-phase state estimation in distribution networks 配电网中单相和三相状态估计的评估
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282458
B. Brinkmann, Karl Bicevskis, R. Scott, M. Negnevitsky
Due to single-phase connected loads and distributed generation, distribution networks often operate under unbalanced loading conditions. This implies that the assumption of a balanced network for the purpose of state estimation does not always hold. Numerous papers have been published on the topic of three-phase state estimation in distribution networks in order to solve this problem. However, there is no generic method to determine whether a three-phase state estimator is required or if a single-phase network representation can deliver a sufficient degree of accuracy. Therefore, in this paper a new method is presented that provides a generic method to choose between the single-and three-phase state estimator method, depending on the network topology, and metering configuration.
由于单相并网负荷和分布式发电的存在,配电网经常处于负荷不平衡状态。这意味着用于状态估计的平衡网络的假设并不总是成立。为了解决这一问题,已经发表了大量关于配电网三相状态估计的论文。然而,没有通用的方法来确定是否需要三相状态估计器,或者单相网络表示是否可以提供足够的精度。因此,本文提出了一种新的方法,根据网络拓扑结构和计量配置,提供了一种通用的方法来选择单相和三相状态估计器方法。
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引用次数: 8
Impact of lightning strikes on substation grounding systems 雷击对变电站接地系统的影响
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282407
S. Dahal, Ralph Martin, S. Paudyal
Extreme weather events in power system could lead to damages resulting into huge financial losses and serious safety issues. One such event is lightning strikes in which high amount of current could flow through lines and substations. The earthing system should be able to discharge such a high amount of current safely to the ground. This paper investigates impacts of frequency of lightning voltage on earth potential rise of a substation. The modelling and simulation of earth and energization parameters are implemented using the current distribution, electromagnetic fields, grounding, and soil structure analysis (CDEGS) tool. The results show that low frequency lightning strikes and high frequency lightning strikes result into different voltage gradients on a substation grounding system. As a result, grounding system designed for a particular frequency strikes may not provide adequate safety against strikes at other frequencies. Safety risks can vary with different frequencies of lightning strikes.
极端天气事件对电力系统的破坏会造成巨大的经济损失和严重的安全问题。雷击就是其中之一,在雷击中,大电流可能流过线路和变电站。接地系统应该能够安全地将如此大的电流放电到地面。本文研究了雷电电压频率对变电站地电位上升的影响。利用电流分布、电磁场、接地和土壤结构分析(CDEGS)工具实现了接地和通电参数的建模和仿真。结果表明,低频雷击和高频雷击在变电站接地系统上产生不同的电压梯度。因此,为特定频率打击设计的接地系统可能无法提供足够的安全防护,以防止其他频率的打击。雷击发生的频率不同,安全风险也不同。
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引用次数: 3
Impacts of community and distributed energy storage systems on unbalanced low voltage networks 社区和分布式储能系统对不平衡低压电网的影响
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282460
Yiju Ma, Mohammad Seydali Seyf Abad, Donald Azuatalam, G. Verbič, Archie C. Chapman
Energy storage systems (ESS) are expected to be an indepensable resource for mitigating the effects on networks of high penetrations of distributed generation in the near future. This paper analyzes the benefits of ESS in unbalanced low voltage (LV) networks regarding three aspects, namely, power losses, the hosting capacity and network unbalance. For doing so, a mixed integer quadratic programmming model (MIQP) is developed to minimize annual energy losses and determine the sizing and placement of ESS, while satisfying voltage constraints. A real unbalanced LV UK grid is adopted to examine the effects of ESS under two scenarios: the installation of one community ESS (CESS) and multiple distributed ESSs (DESSs). The results illustrate that both scenarios present high performance in accomplishing the above tasks, while DESSs, with the same aggregated size, are slightly better. This margin is expected to be amplified as the aggregated size of DESSs increases.
储能系统(ESS)有望在不久的将来成为一种独立的资源,以减轻分布式发电对高渗透网络的影响。本文从电能损耗、主机容量和网络不平衡三个方面分析了ESS在不平衡低压电网中的效益。为此,开发了一个混合整数二次规划模型(MIQP),在满足电压约束的情况下,将年能量损失最小化,并确定ESS的大小和位置。采用一个真实的不平衡低压英国电网,在安装一个社区ESS (CESS)和多个分布式ESS (DESSs)两种情况下,研究了ESS的效果。结果表明,两种场景在完成上述任务时都表现出很高的性能,而在聚合大小相同的情况下,DESSs略好一些。这一差额预计将随着筹资筹资总规模的增加而扩大。
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引用次数: 7
Thermal modelling for demand response of residential buildings 住宅建筑需求响应的热模拟
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282379
B. Du, G. Verbič, J. Fletcher
Energy storage is considered as the dominant factor for the conventional grid to transition into smart grid. The current energy storage technologies have deficits in efficiency, flexibility and are not environmentally friendly. Researchers have proposed to use thermal mass of residential buildings as a medium for storing energy by modifying the behaviour of air-conditioning system. This paper presents a view on the proposed energy storage medium, thermal mass. From simulating the performance of building thermal elements using RC network representation, the possibility of adapting thermal inertia as a means of energy storage is evaluated. With analysis based on a variety of renewable energy generation and demand profile, an optimized material selection is made to further improve the efficiency of the system.
储能被认为是传统电网向智能电网过渡的主导因素。目前的储能技术在效率、灵活性和环境友好性方面存在不足。研究人员提出利用住宅建筑的热质量作为媒介,通过改变空调系统的行为来储存能量。本文对提出的储能介质热质量提出了看法。通过使用RC网络表示模拟建筑热元件的性能,评估了将热惯性作为储能手段的可能性。通过对各种可再生能源发电和需求概况的分析,优化材料选择,进一步提高系统的效率。
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引用次数: 3
Identifying the wheeling costs associated with solar sharing in LV distribution networks in Australia using power flow tracing and MW-Mile methodology 利用潮流追踪和MW-Mile方法确定澳大利亚低压配电网中与太阳能共享相关的车轮成本
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282392
Bosui Li, D. Robinson, A. Agalgaonkar
PV systems, as one type of distributed generation, have been popularly applied to residential and commercial power supply systems for compensating grid electricity consumption. Schemes for sharing PV power within LV distribution networks have also begun to develop, with the aim to more widely spread the benefits of utilizing localized renewable-generated electricity. Consequently, to utilize the local LV distribution network, there is an argument that customers (both small scale generators and consumers) should pay a ‘wheeling charge’ to utilities for grid services related to the transport of energy, similar to their transmission counterparts. This paper presents some of the existing issues related to implementing a ‘wheeling charge’ for network services raised in the process of sharing locally generated PV power in a LV distribution system. Two methodologies: ‘generation matrix’, based on proportional sharing principle; and ‘MW-Mile’, based on network losses, have been combined to cover the economic operation and tracing of energy supplied by a PV generator and transported through the local LV distribution network. An evaluation of the potential costs of using the LV distribution network including daily PV output and building load demand is provided, utilising a case study.
光伏发电系统作为分布式发电的一种,已广泛应用于住宅和商业供电系统中,用于补偿电网用电。在低压配电网络内共享光伏电力的方案也已开始发展,目的是更广泛地传播利用本地可再生能源发电的好处。因此,为了利用当地的低压配电网络,有一种观点认为,客户(包括小型发电机和消费者)应该向公用事业公司支付与能源运输相关的电网服务的“轮转费用”,类似于他们的输电对手。本文介绍了低压配电系统共享本地光伏发电过程中产生的网络服务实施“轮转收费”的一些现有问题。两种方法:基于比例共享原则的“生成矩阵”;和基于网络损耗的“MW-Mile”相结合,涵盖了光伏发电机供电并通过当地低压配电网输送的能源的经济运行和跟踪。利用一个案例研究,对使用低压配电网络的潜在成本进行了评估,包括每日光伏输出和建筑负荷需求。
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引用次数: 3
Design an optimum standalone hybrid renewable energy system for a small town at Portland, Victoria using iHOGA 使用iHOGA为维多利亚波特兰的一个小镇设计一个最佳的独立混合可再生能源系统
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282487
P. Ganguly, Akhtar Kalam, A. Zayegh
Renewable energy sources are being considered as an alternative power generating sources due to their convenience and environmental benefits. Hybrid renewable energy systems(HRES) use two or more types of renewable energy technologies, allowing improved system efficiency and power reliability. This types of systems also help to reduce the requirements of energy storage systems for standalone applications. With the advancements in renewable energy technologies, HRES are becoming increasingly popular in distant area powering applications. Proper sizing of the components of HRES is important as over-sizing may lead to increased establishment cost and under sizing might cause inability to supply the load demand. The paper discusses a detailed methodology to optimally size the components of a HRES for a small town located in Portland, Victoria, Australia, Using the software iHOGA. The optimum system configuration is selected by analyzing the different solutions obtained. The characteristics of the selected system are discussed.
可再生能源因其便利性和环境效益而被认为是一种替代能源。混合可再生能源系统(HRES)使用两种或两种以上类型的可再生能源技术,可以提高系统效率和电力可靠性。这种类型的系统还有助于降低独立应用对储能系统的要求。随着可再生能源技术的进步,HRES在远程供电应用中越来越受欢迎。适当的HRES组件尺寸很重要,因为尺寸过大可能导致建立成本增加,而尺寸不足可能导致无法满足负载需求。本文讨论了一种详细的方法,以优化位于澳大利亚维多利亚州波特兰市的一个小镇的HRES组件,使用软件iHOGA。通过分析得到的不同解,选择出最优的系统结构。讨论了所选系统的特点。
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引用次数: 6
Missing measurement estimation of power transformers using a GRNN 基于GRNN的电力变压器缺失量估计
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282431
Md Mominul Islam, Gareth Lee, S. Hettiwatte
Many industrial devices are monitored by measuring several attributes at a time. For electrical power transformers their condition can be monitored by measuring electrical characteristics such as frequency response and dissolved gas concentrations in insulating oil. These vectors can be processed to indicate the health of a transformer and predict its probability of failure. One weakness of this approach is that missing measurements render the vector incomplete and unusable. A solution is to estimate missing measurements using a General Regression Neural Network on the assumption that they are correlated with other measurements. If these missing values are completed, the entire vector of measurements can be used as an input to a pattern classifier. To test this approach, known values were deliberately omitted allowing an estimate to be compared with actual values. Tests show the method is able to accurately estimate missing values based on a finite set of complete observations.
许多工业设备是通过一次测量几个属性来监控的。对于电力变压器,可以通过测量频率响应和绝缘油中溶解气体浓度等电气特性来监测其状态。可以对这些向量进行处理,以指示变压器的健康状况并预测其故障概率。这种方法的一个缺点是缺少测量会导致矢量不完整和不可用。一种解决方案是使用广义回归神经网络来估计缺失的测量值,假设它们与其他测量值相关。如果这些缺失的值被补全了,那么整个测量向量就可以用作模式分类器的输入。为了测试这种方法,故意省略已知值,以便将估计值与实际值进行比较。实验表明,该方法能够在有限完整观测值的基础上准确估计缺失值。
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引用次数: 0
Axial flux PM coreless stator machine development for low speed wind generator 低速风力发电机轴向磁通永磁无芯定子机研制
Pub Date : 2017-11-01 DOI: 10.1109/AUPEC.2017.8282397
Vladislav Kaliyev, A. Helwig, T. Ahfock
Developing nations' rural populations need small electrical power sources for battery energy storage. Development of a micro-wind generation permanent magnet generator with no or low cogging torque would be a major advancement for low wind speed areas. Here two aspects of the design for this type of wind generator are investigated, with favorable outcomes. These outcomes point the research way forward for development of a revised proto-type low wind-speed generator based on axial flux permanent magnet machine.
发展中国家的农村人口需要小型电源来储存电池能量。开发无齿槽转矩或低齿槽转矩的微型风力发电永磁发电机将是低风速地区的重大进步。本文从两个方面对该类风力发电机的设计进行了探讨,并取得了良好的效果。这些结果为基于轴向磁通永磁电机的改进型低风速发电机的研制指明了研究方向。
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引用次数: 0
期刊
2017 Australasian Universities Power Engineering Conference (AUPEC)
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