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2016 IEEE/PES Transmission and Distribution Conference and Exposition (T&D)最新文献

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Voltage stability of low frequency AC transmission systems 低频交流输电系统的电压稳定性
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7519944
T. Ngo, Q. Nguyen, S. Santoso
This paper investigates the voltage stability of a power system with low frequency AC (LFAC) transmission. Under low frequency conditions, transmission line reactance is reduced and thus the voltage drop along the transmission line is decreased. The LFAC system, therefore, is superior to the conventional 60-Hz system in terms of power transfer capability and, more importantly, voltage instability. In other words, the LFAC can drive a power system further away from instability mode in comparison to the conventional 60-Hz system. A power system voltage stability can be quantified and displayed with the eigenvalues of a Jacobian matrix and the self-sensitivity values by using the modal analysis method. In this paper, the theoretical stability of an LFAC system is discussed first and then validated using several transmission system case studies. The simulation and analysis results show that the LFAC system outperforms the conventional 60 Hz system in terms of voltage stability.
研究了低频交流输电系统的电压稳定性问题。在低频条件下,降低了传输线的电抗,从而减小了沿传输线的电压降。因此,LFAC系统在功率传输能力和更重要的电压不稳定性方面优于传统的60 hz系统。换句话说,与传统的60赫兹系统相比,LFAC可以使电力系统进一步远离不稳定模式。利用模态分析方法,可以用雅可比矩阵的特征值和自灵敏度值来量化和显示电力系统的电压稳定性。本文首先讨论了LFAC系统的理论稳定性,然后用几个传输系统的实例进行了验证。仿真和分析结果表明,LFAC系统在电压稳定性方面优于传统的60 Hz系统。
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引用次数: 10
Including surge arresters in the lightning performance analysis of 132kV transmission line 包括避雷器在132kV输电线路防雷性能分析
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7519906
Saeed Mohajeryami, M. Doostan
Line arresters are considered as an effective way to improve the lightning performance of transmission lines, especially in parts of line that suffer from high soil resistivity and lightning ground flash density. This paper presents results of the application of line surge arresters on the 132KV double circuit transmission line in EMTP-RV and all the practical scenarios for installation of surge arresters. The study has shown that a significant level of improvement can be reached by installing arresters at all or only some of the line phases. It can increase the strength of the line to withstand lightning currents up to -292kA. the probability of having this lightning current, is practically zero.
线路避雷器被认为是提高输电线路防雷性能的有效途径,特别是在高土壤电阻率和雷击地闪密度的线路部分。本文介绍了线路避雷器在EMTP-RV中132KV双回输电线路上的应用效果以及安装避雷器的所有实际场景。研究表明,通过在所有或仅部分线路相位安装避雷器,可以达到显著的改进水平。它可以增加线路的强度,以承受高达-292kA的雷电电流。产生这种闪电电流的可能性,几乎为零。
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引用次数: 7
Probabilistic approach in evaluation of backflashover in 230kV double circuit transmission line 230kV双回输电线路反闪络评估的概率方法
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7519993
Saeed Mohajeryami, M. Doostan
In order to study the problems posed by lightning stroke on vastly exposed transmission lines, it is essential to study different lightning overvoltage phenomena. One of the most significant electrical transients caused by lightning is backflashover. In this paper, by applying Monte Carlo method and considering accurate models of transmission line, grounding system and physical model of breakdown in insulator gap, the backflashover is studied on a 230 kV double circuit transmission line. To apply the proposed approach, the selected case study is simulated in EMTP-RV software and the results are presented.
为了研究雷击对大暴露输电线路造成的问题,有必要研究不同的雷击过电压现象。由闪电引起的最重要的电瞬变之一是反闪络。本文采用蒙特卡罗方法,结合输电线路、接地系统的精确模型和绝缘子间隙击穿的物理模型,对230 kV双回路输电线路的反闪络现象进行了研究。为了应用所提出的方法,在EMTP-RV软件中对选定的案例进行了模拟,并给出了结果。
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引用次数: 1
Chance constraint based risk-aware optimal power flow for cascading failure prevention 基于机会约束的风险感知级联故障预防最优潮流
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7520014
Chao Luo, Jun Yang, Yufei Tang, Haibo He, Mingsong Liu
Once part or whole of the power system is exposed to some dangerous situations, e.g., malicious terrorist attacks or extreme weather conditions, the potential cascading failure is a severe threat to the power system. However, some feasible prevention control strategies can be used to enhance the system robust to cope with the impact of cascading failure. This paper proposed a chance constraint based optimal power flow model considering the impact of cascading failure. Compared to the conventional optimal power flow model, the proposed one can obtain the optimal generation profile that satisfies the chance constraint on the risk level of cascading failure. Power redispatch that is implemented according to the obtained generation profile can be seen as a prevention strategy, which can reduce the threat of cascading failure to an acceptable level. PSO algorithm and Monte Carlo method were used to search for the optimal solution. Case studies on the IEEE 39-bus system illustrate the effectiveness of the proposed model.
一旦部分或整个电力系统暴露在某些危险情况下,如恶意恐怖袭击或极端天气条件下,潜在的级联故障将对电力系统构成严重威胁。然而,可以采用一些可行的预防控制策略来增强系统的鲁棒性,以应对级联故障的影响。提出了一种考虑级联故障影响的基于机会约束的最优潮流模型。与传统的最优潮流模型相比,该模型可以得到满足级联故障风险水平机会约束的最优发电曲线。根据获得的发电配置文件实现的电力重新分配可以被视为一种预防策略,它可以将级联故障的威胁降低到可接受的水平。采用粒子群算法和蒙特卡罗方法寻找最优解。以IEEE 39总线系统为例,验证了该模型的有效性。
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引用次数: 1
Multi-temporal optimal power flow for assessing the renewable generation hosting capacity of an active distribution system 有功配电系统可再生能源发电容量的多时最优潮流评估
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7520043
E. Grover-Silva, R. Girard, G. Kariniotakis
The detailed modeling of distribution grids is expected to be critical to understand the current functionality limits and necessary retrofits to satisfy integration of massive amounts of distributed generation, energy storage devices and the electric consumption demand of the future. Due to the highly dimensional non-convex characteristics of the power flow equations, convex relaxations have been used to ensure an efficient calculation time. However, these relaxations have been proven to be inexact during periods of high RES injection. In this paper additional linear constraints were introduced in the power flow formulation to guaranty an exact relaxation. This convex relaxation is then applied within a multi-temporal algorithm in order to evaluate the benefits of storage grid integration. The case study of a French medium voltage feeder is studied to evaluate the maximum capacity of the grid to host RES sources and the advantages of storage systems in reducing curtailment of RES.
对于了解当前的功能限制和必要的改造,以满足大量分布式发电、储能设备和未来电力消费需求的集成,配电网的详细建模预计是至关重要的。由于功率流方程的高维非凸特性,凸松弛被用来保证高效的计算时间。然而,在高RES注射期间,这些松弛已被证明是不精确的。本文在潮流公式中引入了额外的线性约束,以保证精确的松弛。然后将这种凸松弛应用于多时间算法中,以评估存储网格集成的好处。本文以法国中压馈线为例,评估了电网承载可再生能源的最大容量以及储能系统在减少可再生能源弃电方面的优势。
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引用次数: 8
Adaptive Instantaneous Overcurrent Powered By Frequency Estimation: A case study using a real Brazilian system 频率估计驱动的自适应瞬时过流:一个使用巴西实际系统的案例研究
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7520033
C. Souza, H. Sanca, F. Costa, B. A. Souza
With increasing of distributed generation (DG) and smart grid applications, power protection system (PPS) have been passing for several challenges. Traditional relay coordination presents a relevant difficult to operate with DG plants. Modifications on short-circuits levels and current directionality may include miscoordinations on PPS. An alternative of traditional relay system is adaptive protective system (APS). APS provides an automatic update of relay setting ever when power grid have a modification. A large number of method may be used to identify these modification. In this paper a frequency estimation method was used to identify grid modification and flag to APS methods. To evaluate proposed method, a real Brazilian distribution system was used considering that only instantaneous overcurrent relay compose PPS. Obtainer results shown a efficacy on grid topology identification and same modification among obtained relay settings using APS architecture.
随着分布式发电(DG)和智能电网应用的不断增加,电力保护系统(PPS)面临着诸多挑战。传统的继电器协调存在与DG电厂相关的操作困难。对短路电平和电流方向的修改可能包括PPS上的不协调。自适应保护系统是传统继电保护系统的一种替代方案。当电网发生变化时,APS可自动更新继电器设置。可以使用大量的方法来识别这些修改。本文采用频率估计方法识别网格修改,并将其标记为APS方法。为了验证所提出的方法,以一个实际的巴西配电系统为例,考虑了瞬时过流继电器构成PPS。获取器的结果表明,使用APS架构可以有效地识别网格拓扑,并在获得的中继设置之间进行相同的修改。
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引用次数: 4
Wind power ramping product for increasing power system flexibility 增加电力系统灵活性的风力发电斜坡产品
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7520002
Mingjian Cui, Jie Zhang, Hongyu Wu, B. Hodge, D. Ke, Yuanzhan Sun
With increasing penetrations of wind power, system operators are concerned about a potential lack of system flexibility and ramping capacity in real-time dispatch stages. In this paper, a modified dispatch formulation is proposed considering the wind power ramping product (WPRP). A swinging door algorithm (SDA) and dynamic programming are combined and used to detect WPRPs in the next scheduling periods. The detected WPRPs are included in the unit commitment (UC) formulation considering ramping capacity limits, active power limits, and flexible ramping requirements. The modified formulation is solved by mixed integer linear programming. Numerical simulations on a modified PJM 5-bus System show the effectiveness of the model considering WPRP, which not only reduces the production cost but also does not affect the generation schedules of thermal units.
随着风电渗透率的增加,系统运营商担心在实时调度阶段可能缺乏系统灵活性和扩容能力。本文提出了一种考虑风力发电斜坡产品(WPRP)的改进调度公式。将一种旋转门算法(SDA)与动态规划相结合,用于检测下一个调度周期的wprp。检测到的wprp包括在考虑爬坡容量限制、有功功率限制和灵活爬坡要求的单元承诺(UC)公式中。修正后的公式用混合整数线性规划求解。在一个改进的PJM 5总线系统上的数值模拟表明,考虑WPRP的模型的有效性,不仅降低了生产成本,而且不影响热机组的发电计划。
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引用次数: 13
Application of Battery Energy Storage for network vulnerability mitigation 电池储能在网络脆弱性缓解中的应用
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7519928
A. Moeini, I. Kamwa, M. de Montigny, L. Lenoir
To comply with modern power system regulatory standards, new security strategies and resiliency efforts are required. This work proposes application of Battery Energy Storage (BES) for network vulnerability mitigation. First, a novel disturbance-based vulnerability index is introduced to quantify the robustness of the network. The network vulnerability index (NVI) is a function of the current power flow variables, related distances from security limits and those of post contingency situations, caused by lines and generators outages. Next, Non dominated Sorting Genetic Algorithm II (NSGA-II) is coded on a computing cluster, taking advantage of a massively distributed environment, to optimally allocate BES units while minimizing total size of BES and NVI simultaneously. Study results on IEEE Reliability Test System 1996 (RTS96) prove the effectiveness of NVI to measure the level of network vulnerability. Moreover, it is shown that BES units, if optimally sited and sized, can contribute to the grid resiliency.
为了符合现代电力系统监管标准,需要新的安全策略和弹性工作。本工作提出了电池储能(BES)在网络脆弱性缓解中的应用。首先,引入一种新的基于扰动的脆弱性指标来量化网络的鲁棒性。网络脆弱性指数(NVI)是当前潮流变量、与安全限制的相关距离以及由线路和发电机中断引起的事后应急情况的函数。其次,在计算集群上编码非支配排序遗传算法II (Non - dominant Sorting Genetic Algorithm II, NSGA-II),利用大规模分布式环境,优化BES单元的分配,同时最小化BES和NVI的总规模。IEEE可靠性测试系统1996 (RTS96)的研究结果证明了NVI测量网络脆弱性水平的有效性。此外,研究表明,如果最佳选址和大小的BES单元,可以有助于电网的弹性。
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引用次数: 2
Noise recognition of power transformers based on improved MFCC and VQ 基于改进MFCC和VQ的电力变压器噪声识别
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7519923
B. Yan, G. Qian, F. H. Wang, S. Chen
This paper presents a new method to recognize the noise characteristics of power transformer. First, frame division and windowing are applied to pre-process the noise signals. Then Mel Frequency Cepstrum Coefficient (MFCC) combined with Principal Component Analysis (PCA) is proposed to calculate the feature vectors of noise signals for high accuracy. Finally, the vector quantization (VQ) models are built to recognize the noise characteristics. The noise signals of some 10kV transformer are measured when the core is loosened in different degree. It is shown that the proposed MFCC is capable of describing the noise features of transformer accurately. The results of noise recognition by VQ are agreed well with the preset condition of core. The obtained results are helpful for the optimum design and mechanical condition assessment of power transformer.
提出了一种识别电力变压器噪声特性的新方法。首先,采用分帧和开窗技术对噪声信号进行预处理。然后提出了Mel频率倒谱系数(MFCC)与主成分分析(PCA)相结合的方法来计算噪声信号的特征向量,以提高噪声信号的精度。最后,建立了矢量量化(VQ)模型来识别噪声特征。对某10kV变压器铁芯不同程度松动时的噪声信号进行了测量。结果表明,该方法能够准确地描述变压器的噪声特征。VQ方法的噪声识别结果与芯的预设条件吻合较好。所得结果对电力变压器的优化设计和力学状态评估具有一定的指导意义。
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引用次数: 8
Impacts of short-term solar power forecasts in system operations 短期太阳能发电预测对系统运行的影响
Pub Date : 2016-05-03 DOI: 10.1109/TDC.2016.7519885
E. Ibanez, I. Krad, B. Hodge, E. Ela
Solar generation is experiencing an exponential growth in power systems worldwide and, along with wind power, is posing new challenges to power system operations. Those challenges are characterized by an increase of system variability and uncertainty across many time scales: from days, down to hours, minutes, and seconds. Much of the research in the area has focused on the effect of solar forecasting across hours or days. This paper presents a methodology to capture the effect of short-term forecasting strategies and analyzes the economic and reliability implications of utilizing a simple, yet effective forecasting method for solar PV in intra-day operations.
太阳能发电在全球电力系统中呈指数级增长,并与风力发电一起对电力系统的运行提出了新的挑战。这些挑战的特点是系统可变性和不确定性在许多时间尺度上的增加:从几天到小时、分钟和秒。该领域的大部分研究都集中在数小时或数天的太阳活动预测上。本文提出了一种方法来捕捉短期预测策略的影响,并分析了利用一种简单而有效的预测方法对太阳能光伏发电在日间运行的经济和可靠性影响。
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引用次数: 4
期刊
2016 IEEE/PES Transmission and Distribution Conference and Exposition (T&D)
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