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Pub Date : 2018-12-01 DOI: 10.1109/hipc.2018.00003
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引用次数: 0
Integration and simulation of wind with hydrogen/supercapacitor storage hybrid system 风能与氢/超级电容器储能混合系统的集成与仿真
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893444
S. Z. Hassan, Hui Li, Şuayb Çağriyener, T. Kamal, G. Mufti, M. Waseem, Hina Gohar
This piece of work focuses on wind power generation with hybrid storage system, e.g., hydrogen (fuel cell) and supercapacitor. The wind power has the priority to meet the demand. The fuel cell is added as a backup to ensure long-term energy balance while the supercapacitor is utilized as a buffer and/or backup source during transient. The complete architecture is connected to the utility through various power converters to improve the overall system stability, continuity and reliability of power. The operation of the proposed system is performed through Power Management and Control Strategy (PMCS). The PMCS works in such a way as to maximize the use of wind/fuel/supercapacitor and reduce stress on the utility. The performance of the system is tested for complete one day under different weather and load conditions. MATLAB/Simulink results are shown to verify the effectiveness of the proposed model.
这项工作的重点是风力发电与混合存储系统,如氢(燃料电池)和超级电容器。风电优先满足用电需求。添加燃料电池作为备用,以确保长期能量平衡,而超级电容器在瞬态期间用作缓冲和/或备用电源。完整的架构通过各种电源转换器连接到公用事业,以提高整个系统的稳定性、连续性和可靠性。该系统的运行是通过电源管理和控制策略(PMCS)来完成的。PMCS的工作方式是最大限度地利用风能/燃料/超级电容器,减少对公用事业的压力。在不同的天气和负载条件下,对系统进行了为期一天的性能测试。MATLAB/Simulink仿真结果验证了所提模型的有效性。
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引用次数: 4
7-Level asymmetrical hybrid cascaded multilevel converter topology for traction system 牵引系统7电平不对称混合级联多电平变换器拓扑结构
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893429
M. Ali, Muhammad Mansoor Khan, Zhao Yi, Y. Yang, Houjun Tang
Electrified traction system connected to the medium voltage high power achieve great attention due to its high efficiency. However the conventional topologies used in electrified traction system causes power quality issues such as high harmonics distortion, low power factor on ac line due to the non linear nature of the load. To address the said issues, this paper presents a topology of 7-level asymmetrical cascaded converter based on the series connection of cascaded module of five levels converter (CM), with H-bridge cell to meet the demand of traction application with improved power factor at minimum harmonics distortion. The proposed topology consists of a single dc source and two dc-link capacitors to obtain the desire level of output with minimum power switches. Harmonics compensation is achieved by providing H-bridge cell and cascaded module with a gating signal at fundamental frequency and high switching frequency respectively. Working principle of proposed topology, mathematical analysis, controlled PWM strategy, stability problem related to dc-link capacitor voltage, possible means of balancing and results has been fully investigated with the help of simulation.
与中压大功率相连接的电气化牵引系统以其高效率而备受关注。然而,在电气化牵引系统中使用的传统拓扑结构,由于负载的非线性特性,导致了交流线路的高谐波失真、低功率因数等电能质量问题。针对上述问题,本文提出了一种基于五电平变换器级联模块串联连接的7电平非对称级联变换器拓扑结构,并采用h桥单元,以满足牵引应用的需求,在最小谐波失真的情况下提高功率因数。所提出的拓扑结构由单个直流电源和两个直流链路电容器组成,以最小的功率开关获得所需的输出电平。通过向h桥单元和级联模块分别提供基频和高开关频率的门控信号来实现谐波补偿。本文对所提出的拓扑结构的工作原理、数学分析、可控PWM策略、与直流链路电容电压相关的稳定性问题、可能的平衡方法及结果进行了仿真研究。
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引用次数: 1
Power flow & voltage stability analyses and remedies for a 340 MW nuclear power plant using ETAP 用ETAP分析340兆瓦核电站的潮流和电压稳定性及补救措施
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893436
Muhammad Aman Ullah, A. Qaiser, Q. Saeed, Abdul Rehman Abbasi, Iftikhar Ahmed, A. Q. Soomro
Power flow & voltage stability analyses of a power system are essential for both design and operating stage performance monitoring and to ensure stable and reliable grid operations. In this work, electrical model of a 340 MWe Nuclear Power Plant (NPP) is developed on Electrical Transient Analyzer Program (ETAP), and power flow & voltage stability analyses are performed. Effects of under-& over-voltage transients due to instability in outer power grid on NPP electrical system are then studied. Using power flow analysis that exploits Newton-Raphson algorithm, buses operating at under-voltages, due to power grid transient, are identified and their voltages are improved using on-load tap changer of transformer and reactive power compensation. Capacitor banks and their optimal positions are suggested by using optimal capacitor placement module. Similarly, in case of over-voltage transient, the way the voltages of NPP electrical system are disturbed and methods to overcome them are also implemented. As the nuclear reactor startup is time consuming and expensive, so the results are beneficial since they eliminate the chances of undesired NPP reactor trip due to “reactor coolant pumps buses low voltage” signal. Promising results have been accomplished regarding voltage stability of the NPP.
电力系统的潮流和电压稳定性分析对于设计和运行阶段的性能监测以及确保电网的稳定可靠运行至关重要。本文利用电瞬态分析程序(ETAP)建立了340 MWe核电站的电气模型,并进行了潮流和电压稳定分析。研究了外网不稳定引起的欠压和过压暂态对核电厂电力系统的影响。利用牛顿-拉夫森算法进行潮流分析,识别出电网暂态引起的欠压母线,并采用变压器有载分接开关和无功补偿对母线电压进行改善。利用最优电容放置模块,提出了电容器组及其最优位置。同样,在过电压暂态的情况下,也给出了核电站电力系统电压的扰动方式和克服方法。由于核反应堆启动是耗时且昂贵的,因此该结果是有益的,因为它们消除了由于“反应堆冷却剂泵总线低压”信号而不希望发生的核电厂反应堆跳闸的机会。在核电厂的电压稳定性方面已经取得了可喜的成果。
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引用次数: 2
Battlefield surveillance formalism using WSANs 使用无线局域网的战场监视形式
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893437
Hamra Afzaal, Zafar Iqbal, Tahreem Saeed, N. Zafar
Battlefield surveillance have come into attention to address the issue of national security. In battlefield not only weapons or firepower is required but also an effective command, control system, intelligent pre-planning, and run time decision capability for the effective use of firepower and weapons to win in the war. This increases burden on the army and sometimes in spite of huge efforts they may lose the war. To increase the probability of success in a war Wireless Sensor and Actor Networks WSANs can be used in the battlefield because of their capability of sensing environment, intelligent decision making, commanding capability and performing action on the environment. Therefore this work presents a model for battlefield surveillance using WSANs. Quadrant-based clustering is used to increase the network lifetime. A quadrant consists of sensors, actors (robots) and a controller node for issuing commands. The controllers can communicate with each other to share the information of the quadrant. The proposed model for battlefield surveillance is represented graphically which exhibits the logical architecture. The graph-based model is transformed into an equivalent formal specification using formal specification language, i.e., Vienna Development Method-Specification Language (VDM-SL). VDM-SL is used because of its descriptive nature and effective power of modeling networks. The developed formal specification is analyzed through various techniques available in VDM-SL Toolbox which validates and verifies it.
战场监视已经引起人们的关注,以解决国家安全问题。战场上不仅需要武器或火力,还需要有效的指挥控制系统、智能的预规划和运行时决策能力,才能有效地运用火力和武器,赢得战争的胜利。这增加了军队的负担,有时尽管付出了巨大的努力,他们还是会输掉战争。无线传感器和行动者网络具有感知环境、智能决策、指挥和对环境执行动作的能力,因此可以将无线传感器网络应用于战场,以提高战争的成功率。因此,本文提出了一种基于无线局域网的战场监视模型。使用基于象限的集群来增加网络生命周期。象限由传感器、演员(机器人)和发出命令的控制节点组成。控制器之间可以相互通信,共享象限的信息。所提出的战场监视模型用图形化的方式表示,显示了该模型的逻辑结构。使用正式规范语言,即维也纳开发方法规范语言(VDM-SL),将基于图的模型转换为等效的正式规范。使用VDM-SL是因为它具有描述性和有效的网络建模能力。通过VDM-SL工具箱中可用的各种技术对开发的形式化规范进行分析,并对其进行验证和验证。
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引用次数: 5
An efficient single-phase ac-to-ac buck and boost matrix converter 一个高效的单相交流-交流降压和升压矩阵变换器
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893441
Naveed Ashraf, T. Izhar, G. Abbas
In this research, an efficient direct ac-to-ac matrix converter bucking and boosting both the magnitude and frequency of the output voltage is proposed. The proposed switching converter accomplishes both the non-inverting buck and boost, and the inverting buck and boost operations separately. For accomplishing ac-to-ac conversion, lesser number of PWM controlled switches are employed. This reduces the switching losses, thus enhances the switching converter efficiency. This also reduces the complexity of the control circuit. MATLAB/Simulink environment is used to support the analysis of the proposed switching converter.
在本研究中,提出了一种有效的直接交流-交流矩阵变换器,可以抑制和提高输出电压的幅度和频率。该开关变换器既能实现非反相降压和升压,又能实现反相降压和升压。为了实现交流到交流的转换,使用较少数量的PWM控制开关。这降低了开关损耗,从而提高了开关变换器的效率。这也降低了控制电路的复杂性。采用MATLAB/Simulink环境支持对所提出的开关变换器进行分析。
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引用次数: 2
Global stability properties for a delayed virus dynamics model with humoral immunity response and absorption effect 具有体液免疫反应和吸收效应的延迟病毒动力学模型的全局稳定性
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893424
B. Sampath, A. Pradeep, Hazrat Ali
A model for virus infection with absorption effect and humoral immunity response consisting of system of delay differential equations has been investigated. By direct calculations, the basic number of reproduction and humoral immune-activated reproduction numbers which are also known as threshold values have been obtained. The equilibria of the proposed model, the infection free equilibrium, humoral immune-inactivated equilibrium and humoral immune-activated equilibrium which are completely based on the basic number of reproduction, and humoral immune-activated reproduction number have been found by directly solving the system. Results obtained for Lyapunov functionals and using LaSalle's invariance principle with sufficient conditions, are: (i) the infection free equilibrium satisfied the global asymptotic stability criteria if the basic reproduction number is below unity or equal to unity. (ii) the humoral immune-inactivated equilibrium is globally asymptotically stable, provided that the humoral immune-activated reproduction number is below unit or equal to unity and the basic reproduction number exceeds unity, and (iii) the humoral immune-activated equilibrium satisfies the global asymptotic stability criteria for the case when humoral immune-activated reproduction number exceeds unity.
研究了由时滞微分方程组组成的病毒感染吸收效应和体液免疫反应模型。通过直接计算,获得了基本繁殖数和体液免疫激活繁殖数,也称为阈值。通过对系统的直接求解,得到了模型的无感染平衡、体液免疫灭活平衡和体液免疫激活平衡,这三种平衡完全基于基本繁殖数和体液免疫激活繁殖数。对于Lyapunov泛函,在充分条件下,利用LaSalle不变性原理,得到:(i)当基本繁殖数小于或等于单位时,无感染平衡点满足全局渐近稳定性判据。(ii)体液免疫灭活平衡是全局渐近稳定的,前提是体液免疫激活繁殖数低于单位或等于单位,且基本繁殖数超过单位;(iii)体液免疫激活平衡在体液免疫激活繁殖数超过单位的情况下满足全局渐近稳定标准。
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引用次数: 1
Simulating the electromagnetic effects of thermally induced residual stresses in RF-MEMS switches 模拟RF-MEMS开关中热致残余应力的电磁效应
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893446
Amna Riaz, Hassan Adnan Malik, S. M. H. Zaidi
Radio frequency microelectromechanical systems (RF-MEMS) switches exhibit significant variations in the electrical, mechanical and thermal properties of their constituting materials after different microfabrication processes. During the cycle of thermal loading and unloading in the process of plasma etching, non-homogeneous tensile residual stress is formed in the microbeams of RF-MEMS Symmetric Toggle Switches (STS). This paper demonstrates the effect of these thermally induced residual stresses on the electromagnetic properties (S-parameters) of STS. In order to determine the radio frequency response of the switches, electromagnetic simulation is performed on a Finite Element Method (FEM) three dimensional model of the switch. The insertion and return losses with and without residual stresses are compared and the effect of thermally induced residual stress on them is verified.
射频微机电系统(RF-MEMS)开关在不同的微加工工艺后,其构成材料的电学、机械和热性能表现出显著的变化。等离子体刻蚀过程中,在热加载和卸载循环过程中,RF-MEMS对称拨动开关(STS)的微光束中会形成非均匀的拉伸残余应力。本文论证了这些热致残余应力对STS电磁性能(s参数)的影响。为了确定开关的射频响应,对开关的三维有限元模型进行了电磁仿真。比较了有残余应力和无残余应力时的插入损耗和返回损耗,验证了热致残余应力对插入损耗和返回损耗的影响。
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引用次数: 1
Power quality analysis of a three phase ac-to-dc controlled converter 三相交直流控制变换器的电能质量分析
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893435
Naveed Ashraf, T. Izhar, G. Abbas, A. R. Yasin, Abdul Rehman Kashif
The controlled ac-to-dc converters are used to control the output dc voltage. A six pulses controlled ac-to-dc converter is one of the efficient converters that is widely used in many industrial applications. The main advantage of any higher pulse converter in ac-to-dc conversion is low ripple factor but on the other hand, it highly distorts the input supplied currents. This distortion degrades the power factor, and increases the stresses across the protective devices and measuring units in the power system, hence exhibits poor power quality. It becomes important to analyze the power quality in ac-to-dc power conversion. A new approach called pulse selective method is introduced to analytically calculate the harmonics in a three phase rectifier circuit both for input and output. Then power quality performance parameters are analyzed on the basis of computed harmonics. Simulation modeling is used to verify the proposed method.
控制的交直流变换器用于控制输出直流电压。六脉冲控制的交直流变换器是一种广泛应用于许多工业应用的高效变换器。在交直流转换中,任何高脉冲变换器的主要优点是纹波系数低,但另一方面,它会严重扭曲输入供电电流。这种失真降低了功率因数,并增加了电力系统中保护装置和测量单元的应力,因此表现出较差的电能质量。在交直流电源转换过程中,电能质量分析显得尤为重要。介绍了一种用于分析计算三相整流电路输入输出谐波的新方法——脉冲选择法。然后在计算谐波的基础上对电能质量性能参数进行分析。仿真建模验证了该方法的有效性。
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引用次数: 4
Optimal planning and design of hybrid energy system for UET Taxila UET紫杉树混合能源系统优化规划与设计
Pub Date : 2017-03-02 DOI: 10.1109/ICEE.2017.7893428
H. Habib, T. Mahmood
Renewable energy resources are being realized as a suitable options in hybrid energy planning for on-grid and micro grid. In this paper, operation, planning and optimal design of on-grid distributed energy resources based hybrid system is investigated. The aim is to minimize the cost of the overall energy system keeping in view the environmental emission and minimum penetration of conventional energy resources. Seven grid connected different case studies including diesel only, diesel-renewable based, and renewable based only are designed to perform economic analysis, operational planning and emission. Sensitivity analysis is implemented to investigate the impact of different parameters on the performance of energy resources.
可再生能源正在成为并网和微网混合能源规划的合适选择。本文研究了基于并网分布式能源的混合系统的运行、规划和优化设计问题。其目的是尽量减少整个能源系统的成本,同时考虑到环境排放和尽量减少常规能源的渗透。七个电网连接的不同案例研究,包括纯柴油、基于柴油可再生能源和纯可再生能源,旨在进行经济分析、运营规划和排放。采用灵敏度分析方法研究了不同参数对能源性能的影响。
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引用次数: 9
期刊
2017 International Conference on Electrical Engineering (ICEE)
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