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On optimal sizing, siting and timing of distribution substations 配电变电所的最佳规模、选址和时间安排
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565964
S. Najafi, R. Gholizadeh
Optimal distribution substation placement is one of the major components of optimal distribution system planning projects. This paper proposes the application of an Imperialist Competitive Algorithm (ICA) for the optimal expansion planning of large distribution network, solving the optimal sizing, siting and timing of medium voltage substation, using related fixed and variable costs subject to any operating and optimization constraints. A step by step expansion design and planning is proposed to consider dynamic behavior of the load forecasting uncertainty, asset management and geographical constraints. In order to reach the global solution, an effective coding for the ICA parameter is developed. The value of loads' density in every site is determined by mid and long-term load forecasting program. The results show the efficiency and capability of the proposed method which has been tested on a large-scale real size distribution network.
配电变电站优化布置是配电系统优化规划的重要组成部分之一。本文提出将帝国主义竞争算法(ICA)应用于大型配电网的最优扩容规划,利用相关的固定和可变成本,在任何运行和优化约束下,求解中压变电站的最优规模、选址和时机。提出了考虑负荷预测不确定性、资产管理和地理约束等动态特性的分步扩容设计和规划方法。为了得到全局解,提出了一种有效的ICA参数编码方法。各站点的负荷密度值由中长期负荷预测程序确定。结果表明了该方法的有效性和有效性,并在实际大型配电网上进行了验证。
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引用次数: 4
Application of embedded Z-Source inverters in Grid connected photovoltaic systems 嵌入式z源逆变器在并网光伏系统中的应用
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565954
S. Khani, L. Mohammadian, Seyed Hossein, K. R. Milani
This paper proposes the use of the embedded Z-Source (EZ-source) inverters in photovoltaic (PV) grid interconnection. Being different from the traditional Z-source inverter, EZ-source inverters are constructed by inserting dc sources into the X-shaped impedance network so that the dc input current flows smoothly during the whole switching period unlike the traditional Z-source inverter. Fully parallel embedded Z-Source (FPEZ-source) inverters are one of the EZ-source inverters topologies with two isolated dc sources are embedded with each inductor of X-shaped network in series and so we can use two PV panel in this structure. The control system consist of two parts: one part adjusts the shoot through time for maximum power point tracking (MPPT) by simple dp/dv method and another part generate the reference current for FPEZ-source inverter to inject maximum available power of PV array to grid with high quality and maintain DC link capacitor voltage in its reference value. The performance of proposed structure and control strategy is validated with simulation results obtained using PSCAD/EMTDC software.
本文提出了嵌入式z源(EZ-source)逆变器在光伏(PV)电网互联中的应用。与传统的z源逆变器不同,ez源逆变器是将直流电源插入到x形阻抗网络中,使得直流输入电流在整个开关周期内平滑流动,这与传统的z源逆变器不同。全并联嵌入式z源(fpez源)逆变器是一种ez源逆变器拓扑结构,其中两个隔离直流电源串联嵌入x形网络的每个电感,因此我们可以在这种结构中使用两个光伏板。控制系统由两部分组成,一部分是通过简单的dp/dv法调节最大功率点跟踪(MPPT)的通过时间,另一部分是为fpez源逆变器产生参考电流,使光伏阵列的最大可用功率高质量地注入电网,并使直流链路电容电压保持在其参考值。采用PSCAD/EMTDC软件进行仿真,验证了所提出结构和控制策略的性能。
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引用次数: 8
New fuzzy control system design for maximum power point tracking of wind turbine 风电机组最大功率点跟踪模糊控制系统设计
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565957
Hamed Heydari-doostabad, Reza Keypour, Naser Eskandarian, M. Khalghani
This paper introduces a new fuzzy control system that is consisted of uncertainty to extract maximum possible power of wind. This system is based on fuzzy logic that can be tracked maximum power point of wind conversion system based on Permanent Magnet Synchronous Generator. In this type of fuzzy system determination of membership function is not with exact and membership functions are determined by a bound of operating.
本文介绍了一种新的由不确定性组成的模糊控制系统,以提取最大可能的风力。该系统基于模糊逻辑,可以对永磁同步发电机风力转换系统的最大功率点进行跟踪。在这类模糊系统中,隶属函数的确定是不精确的,隶属函数是由一个操作界来确定的。
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引用次数: 9
Application of a grid scale energy storage system to reduce distribution network losses 电网规模储能系统在降低配电网损耗中的应用
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565963
H. Saboori, H. Abdi
Recent progress in advanced energy storage systems (ESS) and their relative technological maturity imply a promising future for energy storage. As a consequence, the use of stored energy to support and optimize the generation, transmission, and distribution subsystems has been grown up worldwide. One of the ESS applications is using them for load leveling. Since network losses is a square function of current, shifting load from peak to off-peak periods can potentially reduce system losses. This paper gives a quantitative survey of the possible reduction in losses, for a situation where distribution feeder load is shifted in time but not reduced. Load leveling practice will be done by an ESS unit installed in the distribution substation. Various factors governing loss reduction such as transformer side installation (MVlLV) are analyzed. Also, required ESS characteristics like Ampere-hour (Ah) capacity, current, power, and charge /discharge speed to ideally leveling the load are presented. Simulation results show that besides loss reduction, load leveling has a significant impact on network capacity. In other words, shifting peak load can defer investment plans considering load growth in the near future.
先进储能系统(ESS)的最新进展及其相对成熟的技术意味着储能的前景广阔。因此,利用储存的能量来支持和优化发电、输电和配电子系统已经在世界范围内发展起来。其中一个ESS应用程序使用它们来均衡负载。由于网络损耗是电流的平方函数,将负载从高峰转移到非高峰可以潜在地减少系统损耗。本文对配电馈线负荷及时转移但不减少的情况下可能减少的损失进行了定量调查。负荷均衡实践将由安装在配电变电所的ESS装置完成。分析了影响减损的各种因素,如变压器侧安装。此外,所需要的ESS特性,如安培小时(Ah)容量、电流、功率和充放电速度,以理想地均衡负载。仿真结果表明,除减少网络损耗外,负载均衡对网络容量也有显著影响。换句话说,转移峰值负荷可以推迟考虑近期负荷增长的投资计划。
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引用次数: 28
Ethical climate, job satisfaction, organizational commitment and intention to leave in personnel of shiraz electric power distribution company 设拉子配电公司员工的道德氛围、工作满意度、组织承诺和离职意向
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565965
Hojat Moshtaghian Abarghooi, Azim Nobakht, Ali Anvari
Purpose of this study was to investigate the relationship between ethical climate, job satisfaction, organizational commitment and intention to leave, among employees in Shiraz electric distribution company. This study is applied research, and correctional study, was conducted in 1390. The Statistical Society included 100 people from employees of Shiraz electric distribution company. In this study, measurement tools, was standardized questionnaires. Islamic ethics questionnaire Yousef Darwish, 2000, Spector Job Satisfaction Questionnaire, 1997, blav intention to leave questionnaire 1978 and Alen and Mier organizational commitment questionnaire 2004. Lisrel and Spss software were used for analysis. The results confirm the causal model. Results of research showed that ethical climate has positive effect on organizational commitment and and job satisfaction and organizational commitment have negative effect on intention to leave. The results of research can improve job satisfaction and organizational commitment bye improve ethical climate and can reduce intention to leave in organization.
摘要本研究旨在探讨设拉子配电公司员工职业道德氛围、工作满意度、组织承诺与离职意向之间的关系。本研究是应用研究,也是矫正研究,于1390年进行。统计学会的调查对象是设拉子电力公司的100名职员。本研究的测量工具,为标准化问卷。伊斯兰伦理问卷Yousef Darwish (2000), Spector工作满意度问卷(1997),blav离职意向问卷(1978)和Alen and Mier组织承诺问卷(2004)。采用Lisrel和Spss软件进行分析。结果证实了因果模型。研究结果表明,伦理氛围对组织承诺有正向影响,工作满意度和组织承诺对离职意愿有负向影响。研究结果可以通过改善伦理氛围来提高工作满意度和组织承诺,并可以降低组织的离职意向。
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引用次数: 0
Design and use of a sensitive device to prevention of stealing wires in power distribution networks 设计和使用一种敏感装置来防止配电网络中的电线被盗
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565972
F. Mohammadi
On average a lot of wires used in electrical power distribution network become stolen every day and a very heavy cost spends on replacing new wires to stolen-wires. In this project, the stealing of power distribution network's wire will prevent and reduce with using systems-based with a very low cost method and high precision.
平均而言,配电网中每天都有大量电线被盗,更换被盗电线的成本非常高。在本项目中,采用基于系统的低成本、高精度的方法来防止和减少配电网电线的盗窃。
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引用次数: 1
Investigation on transient stability of an industrial network and relevant impact on over-current protection performance 工业电网暂态稳定性及其对过流保护性能影响的研究
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565971
B. Keyvani, H. Nafisi, H. Lesani
System protection performance and transient stability of the electrical network are significantly affected by each other. The larger the time delay in which protection detects and clears the fault, the more likely loss of synchronism will be, especially in the networks with internal generation. Over current protection schemes inherently operates with considerable delay. Moreover, system dynamic oscillations discernibly aggravate their performance. Therefore utilizing them as main protection is controversial and even abortive in order to maintain system stability. In this paper, transient stability of a real industrial network is studied. The study is investigated using critical clearing time (CCT) criterion for different network configuration. Equipments such as generators and motors are modeled and simulated by DIgSILENT software. In addition, the operation of over current relays adjusted by conventional methods is investigated dynamically and its performance is examined under different network configurations.
系统保护性能与电网暂态稳定是相互影响的重要因素。保护检测和清除故障的时间延迟越大,丢失同步的可能性越大,特别是在内部产生的网络中。电流过大的保护方案固有地存在相当大的延迟。此外,系统的动态振荡明显地加剧了它们的性能。因此,为了保持系统的稳定性,利用它们作为主要保护是有争议的,甚至是失败的。本文研究了实际工业网络的暂态稳定性问题。采用临界清除时间(CCT)准则对不同的网络配置进行了研究。利用DIgSILENT软件对发电机、电机等设备进行了建模和仿真。此外,还动态研究了采用常规方法调整过电流继电器的运行情况,并对其在不同网络配置下的性能进行了测试。
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引用次数: 4
A new method to analyze power quality phenomena using wavelet and s-transform matrix 提出了一种利用小波变换和s变换矩阵分析电能质量现象的新方法
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565970
Mohsen Hosseini, Saed Jalilzade
A novel method based on s-transform matrix for analyzing power quality is proposed in this paper. It proposes a very fast and robust algorithm to identify and measure PQ disturbances. The capability of this algorithm to recognize and measure disturbances in both time and frequency domains will assist in precise disturbance localization and detection. Many case studies considered here, containing voltage swell, voltage sag, harmonics, interharmonics, transients, voltage changes with multiple frequencies, voltage fluctuation, or flicker and voltage disrupt will be investigated comprehensively by using this new time-frequency analysis method. Calculations have been carried out by matlab software, and the results shows that this method can use in accurate PQ disturbance identification.
提出了一种基于s变换矩阵的电能质量分析方法。提出了一种快速、鲁棒的PQ干扰识别和测量算法。该算法在时域和频域识别和测量干扰的能力将有助于精确的干扰定位和检测。本文所考虑的许多情况,包括电压膨胀、电压凹陷、谐波、间谐波、瞬态、多频电压变化、电压波动、闪烁和电压中断,将通过这种新的时频分析方法进行全面研究。通过matlab软件进行了计算,结果表明该方法可用于精确的PQ干扰辨识。
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引用次数: 2
Improving direct load control implementation by an inititative load control method 采用主动负荷控制方法改进直接负荷控制的实施
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565975
Mohammad Rastegar, M. Fotuhi‐Firuzabad, M. Moeini‐Aghtaie
Demand response (DR) as a state-of-the-art program is accommodated in the energy efficiency contexts of the smart grid. Lack of the customer knowledge about how to respond to the time-differentiated tariffs and offered controlling signals is the major obstacle in the way of broad DR implementing. As a solution, an optimization method, namely load control (LC), is proposed to automatically control the on/off status of the responsive appliances in a smart home. This paper focuses on the direct load control (DLC) program in the category of incentive-based DR programs. LC is extended to consider inconvenience cost of the DLC implementation for DLC program participants. Outputs of the extended LC would be an advice for the customer to determine whether it is financially profitable to participate in the offered DLC program or not. Numerical studies are effectuated to investigate different features of the LC and DLC program.
需求响应(DR)作为一项最先进的计划,在智能电网的能源效率背景下得以适应。缺乏客户对如何响应时间差关税和提供的控制信号的了解是广泛实施DR的主要障碍。为此,提出了一种优化方法,即负载控制(LC),来自动控制智能家居中响应电器的开/关状态。本文主要研究基于激励的直接负荷控制(DLC)方案。LC的扩展考虑了DLC实施对DLC计划参与者的不便成本。扩展LC的输出将是客户确定参与提供的DLC计划是否在经济上有利可图的建议。对LC和DLC程序的不同特性进行了数值研究。
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引用次数: 9
Nonlinear control of STATCOM in presence of filter based on indirect control of DC link voltage 基于直流链路电压间接控制的有滤波器的STATCOM非线性控制
Pub Date : 2013-07-25 DOI: 10.1109/EPDC.2013.6565969
F. Moghaddam, A. Amel, H. Abyaneh, N. Farokhnia
In previous researches, a signal-based model of power network and STATCOM accompanied by its controller is presented. Using such a model, considering shunt filters is so complicated. Implementing filters is the most popular method of harmonic elimination in networks which contain FACTS & power electronic devices. Also, there is a need to simulate the real model of power network and STATCOM switching model. This type of modelling provides us with the capability of doing some important studies such as: fault analysis, stability analysis and other similar analyses about the interaction between STATCOM and the power network operation. In this paper, a real power and switching model of STAT COM accompanied by an efficient controller in presence of a shunt filter is proposed. This model makes it possible to easily adapt the controller operation in presence of filter, with no necessity of solving the complicated equations which exist in signal-based models. Using this model, the controller is designed when the shunt filter is utilized. Moreover, the effectiveness of filter utilization in reducing the current THD is also studied. The proposed STATCOM controller is nonlinear, which is based on indirect control of DC link voltage.
在以往的研究中,提出了一种基于信号的电网模型和STATCOM及其控制器。使用这样的模型,考虑到分流滤波器是如此复杂。在包含FACTS和电力电子设备的网络中,实施滤波器是最常用的谐波消除方法。此外,还需要对实际电网模型和STATCOM交换模型进行仿真。这种模型为STATCOM与电网运行的相互作用进行故障分析、稳定性分析等重要研究提供了能力。本文提出了在并联滤波器存在的情况下,带有效控制器的statcom的实际功率和开关模型。该模型可以方便地适应存在滤波器的控制器运行,而不需要求解基于信号的模型中存在的复杂方程。利用该模型,设计了采用并联滤波器时的控制器。此外,还研究了利用滤波器降低电流THD的有效性。所提出的STATCOM控制器是基于直流链路电压间接控制的非线性控制器。
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引用次数: 2
期刊
18th Electric Power Distribution Conference
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