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2020 IEEE Power & Energy Society General Meeting (PESGM)最新文献

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Improved Disjunctive Models for the Transmission Expansion Planning 输电扩展规划的改进析取模型
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9281594
Laura M. Escobar, A. Escobar Z., R. Romero L.
This paper presents two improved disjunctive models for the transmission expansion planning problem, with the inclusion of additional critic cycles has been developed by the authors in recent works, in order to improve some of the traditional long-term transmission network expansion planning problem models. The reason behind it is the absence of Kirchhoff second law which completes the representation of the transmission system, but increase the complexity, making some big-sized problems impossible to solve depending of their topology. This improvement will allow the model to be solve the majority of the test systems with less computational effort and in less time. For specific cases the improved models help find better solution, which can be used as an starting point to find the optimal solution. The new models are implemented in AMPL, using the solver CPLEX. This paper uses the Colombian test system to illustrate the effectiveness of the proposed framework.
为了改进传统的输电网长期扩展规划问题模型,本文提出了两个改进的析取模型,其中包含了作者在最近的工作中提出的额外的临界周期。其背后的原因是没有完成传输系统表示的基尔霍夫第二定律,但增加了复杂性,使得一些大型问题无法依靠其拓扑来解决。这种改进将允许该模型以更少的计算工作量和更短的时间解决大多数测试系统。在特定的情况下,改进的模型可以帮助找到更好的解,这可以作为寻找最优解的起点。利用求解器CPLEX在AMPL中实现了新模型。本文使用哥伦比亚测试系统来说明所提出框架的有效性。
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引用次数: 0
Line-Wise Power Flow and Voltage Collapse 线路潮流和电压崩溃
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9282030
B. Venkatesh, A. Mohamed
Voltage collapse is a phenomenon where voltage collapses at one or more busses due to lack of reactive power characterized by a decrease in voltage with increase in reactive power injection and voltage drop in connected lines due to large power flows. Bus-wise power balance equations, solved using the Newton– Raphson (NR) technique, are widely used to analyze power systems for VC. While bus-wise power balance equations succinctly model a power system, it and its Jacobian do not readily point out the most critical set of lines without additional analysis. In this paper, first, a line-wise set of equations for modeling a power system and its solution method using the NR technique for power flow analysis are proposed. Study results on 6-, 14-, 57-, and 118-bus IEEE systems, a 582-bus real system, 2383-bus Polish power system, and 9241-bus PEGASE system show that the proposed method is accurate, provides monotonic convergence, scales well of large systems, and is consistently faster up to twice the speed of the bus-wise NR method, while using sparse matrices. Second, a line-wise VC index is derived and shown to be directly present in the Jacobian of the line-wise NR method, identifying the susceptible set of lines without additional computation. Usefulness of VC index as an online VC assessment tool is demonstrated for a critical loading condition on test systems.
电压崩溃是指由于缺乏无功功率而导致一个或多个母线电压崩溃的现象,其特征是电压随着无功功率注入的增加而降低,而由于大的功率流而使连接线路电压下降。采用牛顿-拉夫森(NR)技术求解的基于总线的功率平衡方程,广泛用于VC系统的电力系统分析。虽然母线功率平衡方程简洁地模拟了一个电力系统,但它及其雅可比矩阵在没有额外分析的情况下,并不能很容易地指出最关键的一组线路。本文首先提出了电力系统沿线建模的一组方程,并利用NR技术对其进行求解。在6总线、14总线、57总线和118总线的IEEE系统、582总线的真实系统、2383总线的波兰电力系统和9241总线的PEGASE系统上的研究结果表明,所提出的方法是准确的,具有单调收敛性,可以很好地扩展大型系统,并且在使用稀疏矩阵的情况下,速度始终是基于总线的NR方法的两倍。其次,推导出线性VC指数,并显示直接存在于线性NR方法的雅可比矩阵中,识别出易受影响的线集,而无需额外的计算。在测试系统的一个临界加载条件下,论证了VC指标作为在线VC评估工具的有效性。
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引用次数: 0
Fast Identification of Saturated Cut-sets using Graph Search Techniques 利用图搜索技术快速识别饱和切集
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9281500
R. Biswas, A. Pal, Trevor Werho, V. Vittal
When multiple outages occur in rapid succession, it is important to know quickly if the power transfer capability of different interconnections (or cut-sets) of the power network are limited. The algorithm developed in this paper identifies such limited cut-sets very fast, thereby enhancing the real-time situational awareness of power system operators. The significance of the proposed approach is described using the IEEE 39-bus test system, while its computational benefits are demonstrated using relatively large test-cases containing thousands of buses. The results indicate that the proposed network analysis can estimate the impact of an outage on any cut-set of the system and screen out the cut-set that gets saturated by the largest margin, very quickly.
当快速连续发生多次停电时,快速了解电网不同互连(或割集)的输电能力是否有限是非常重要的。本文提出的算法能够快速识别出这些有限割集,从而提高电力系统操作员的实时态势感知能力。使用IEEE 39总线测试系统描述了所提出方法的意义,而使用包含数千总线的相对较大的测试用例证明了其计算效益。结果表明,所提出的网络分析方法可以快速估计停电对系统任意切集的影响,并筛选出饱和余量最大的切集。
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引用次数: 2
A Unified Droop-Free Distributed Secondary Control for Grid-Following and Grid-Forming Inverters in AC Microgrids 交流微电网随网与成网逆变器统一无下垂分布式二次控制
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9282042
S. Mohiuddin, Junjian Qi
The inverter-based distributed generators (DGs) in microgrids usually operate in either grid-following (GFL) or grid-forming (GFM) control mode. In GFL mode the DG follows the voltage and frequency of the microgrid while in GFM mode it dictates voltage and frequency for the microgrid. In this paper, we propose a unified droop-free distributed secondary control for both GFL and GFM inverters based on distributed optimization. The proposed control regulates the frequency to nominal frequency, regulates the global average voltage in the microgrid to the rated voltage, and ensures accurate active and reactive power sharing among all GFL and GFM inverters. The DGs can communicate through a sparse communication network and share information about average voltage estimates and nominal active/reactive power. The effectiveness of the proposed control is validated through simulations on an eight-DG test microgrid with four GFL inverters and four GFM inverters.
微电网中基于逆变器的分布式发电机(dg)通常以随网(GFL)和成网(GFM)两种控制方式运行。在GFL模式下,DG跟随微电网的电压和频率,而在GFM模式下,DG指示微电网的电压和频率。本文提出了一种基于分布式优化的GFL和GFM逆变器统一无下垂分布式二次控制方法。该控制器将频率调节到标称频率,将微电网的全局平均电压调节到额定电压,并确保所有GFL和GFM逆变器之间准确的有功和无功共享。dg可以通过稀疏通信网络进行通信,共享平均电压估计和标称有功/无功功率信息。通过8 dg测试微电网中4台GFL逆变器和4台GFM逆变器的仿真验证了该控制方法的有效性。
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引用次数: 6
Viability of Synchronous Reference Frame Phase Locked Loop Inverter Control in an All Inverter Grid 全逆变电网中同步参考帧锁相环逆变器控制的可行性
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9282091
D. Ramasubramanian, E. Farantatos
State of the art bulk power system connected inverter based resources make use of a variant of a synchronous reference frame (SRF) phase locked loop (PLL) in order to track the phase angle of the grid and subsequently inject current into the grid. Successful and speedy tracking of this angle is considered to be a requirement for stable operation of the inverter in grid connected mode. However, it has been postulated in literature that in 100% inverter grids, conventional SRF-PLL based inverter controls will be unable to operate in a stable manner as they follow a grid voltage. In this paper, it will be shown that there could be certain loading levels and system topologies for which an SRF-PLL based 100% inverter system can be operated in a stable manner and thus, a blanket statement that it would not be able to operate could be misleading to a transmission planner. Simulation results shown in this paper were conducted in electromagnetic transient domain.
目前基于逆变器资源的大容量电力系统利用同步参考帧(SRF)锁相环(PLL)的一种变型来跟踪电网的相角并随后向电网注入电流。成功且快速地跟踪该角度被认为是逆变器在并网模式下稳定运行的必要条件。然而,在文献中已经假设,在100%逆变电网中,传统的基于SRF-PLL的逆变器控制将无法以稳定的方式运行,因为它们遵循电网电压。在本文中,将显示可能存在某些负载水平和系统拓扑,其中基于SRF-PLL的100%逆变器系统可以以稳定的方式运行,因此,它无法运行的总体声明可能会误导传输规划器。本文的仿真结果是在电磁瞬变域中进行的。
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引用次数: 4
Exploration of Smart Grid Device Cybersecurity Vulnerability Using Shodan 基于Shodan的智能电网设备网络安全漏洞研究
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9281544
Darryl Ackley, Hengzhao Yang
The generation, transmission, distribution, and storage of electric power is becoming increasingly decentralized. Advances in Distributed Energy Resources (DERs) are rapidly changing the nature of the power grid. Moreover, the accommodation of these new technologies by the legacy grid requires that an increasing number of devices be Internet connected so as to allow for sensor and actuator information to be collected, transmitted, and processed. With the wide adoption of the Internet of Things (IoT), the cybersecurity vulnerabilities of smart grid devices that can potentially affect the stability, reliability, and resilience of the power grid need to be carefully examined and addressed. This is especially true in situations in which smart grid devices are deployed with default configurations or without reasonable protections against malicious activities. While much work has been done to characterize the vulnerabilities associated with Supervisory Control and Data Acquisition (SCADA) and Industrial Control System (ICS) devices, this paper demonstrates that similar vulnerabilities associated with the newer class of IoT smart grid devices are becoming a concern. Specifically, this paper first performs an evaluation of such devices using the Shodan platform and text processing techniques to analyze a potential vulnerability involving the lack of password protection. This work further explores several Shodan search terms that can be used to identify additional smart grid components that can be evaluated in terms of cybersecurity vulnerabilities. Finally, this paper presents recommendations for the more secure deployment of such smart grid devices.
电力的生产、传输、分配和储存正变得越来越分散。分布式能源(DERs)技术的进步正在迅速改变电网的性质。此外,传统电网对这些新技术的适应要求越来越多的设备与互联网连接,以便收集、传输和处理传感器和执行器信息。随着物联网(IoT)的广泛采用,需要仔细检查和解决智能电网设备的网络安全漏洞,这些漏洞可能会影响电网的稳定性、可靠性和弹性。在使用默认配置部署智能电网设备或没有针对恶意活动的合理保护的情况下尤其如此。虽然已经做了很多工作来描述与监控和数据采集(SCADA)和工业控制系统(ICS)设备相关的漏洞,但本文表明,与新型物联网智能电网设备相关的类似漏洞正在成为一个问题。具体而言,本文首先使用Shodan平台和文本处理技术对此类设备进行评估,分析缺乏密码保护的潜在漏洞。这项工作进一步探索了几个Shodan搜索词,可用于识别可根据网络安全漏洞进行评估的其他智能电网组件。最后,本文提出了更安全部署此类智能电网设备的建议。
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引用次数: 2
Impact of different CO2-pricing schemes on the profitability of Energy Hubs 不同的二氧化碳定价方案对能源中心盈利能力的影响
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9281587
Jonte Dancker, M. Wolter
To reach the Paris Agreement objectives more and more countries implement CO2-pricing schemes. These schemes are seen as a political solution to force a reduction of CO2-emissions in today’s energy consumption. On the other hand, integrated energy systems (IES) are part of the technological solution. Thus, different optimization algorithms have been developed and enhanced to optimally design and operate such systems. However, these algorithms do not include CO2-pricing schemes in their objective function neglecting current political trends. Therefore, this paper compares different CO2-pricing schemes and their impact on the profitability of integrated energy systems. It is shown that a CO2-price on gas provides an incentive to set up an IES. However, even today’s highest CO2-price is not sufficient to raise the profitability of an IES over a non-integrated energy system. If a uniform CO2-price on electricity and gas is set the threshold is even higher.
为了实现《巴黎协定》的目标,越来越多的国家实施二氧化碳定价计划。这些计划被视为一种政治解决方案,以迫使减少当今能源消耗中的二氧化碳排放。另一方面,综合能源系统(IES)是技术解决方案的一部分。因此,不同的优化算法已经被开发和增强,以优化设计和操作这样的系统。然而,这些算法没有将二氧化碳定价方案纳入其目标函数,忽略了当前的政治趋势。因此,本文比较了不同的二氧化碳定价方案及其对综合能源系统盈利能力的影响。研究表明,对天然气的二氧化碳定价提供了建立IES的激励。然而,即使是目前最高的二氧化碳价格,也不足以提高IES相对于非一体化能源系统的盈利能力。如果对电力和天然气设定统一的二氧化碳价格,门槛就会更高。
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引用次数: 1
Evaluating the Influence of Momentary Cessation Mode in Inverter-Based Distributed Generators on Power System Transient Stability 基于逆变器的分布式发电机瞬间停止模式对电力系统暂态稳定性的影响评估
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9281463
Heewon Shin, J. Jung, Seungchan Oh, K. Hur, K. Iba, Byongjun Lee
The responses of an inverter-based distributed generator (IBDG) to abnormal voltage and frequency are different from those of a conventional generator because of the inverter’s operating modes. In particular, although the momentary cessation (MC) mode is essential as a control strategy in the distribution system, the MC mode can affect the power system transient stability by temporarily ceasing significant amounts of IBDG generation. To mitigate these negative effects, this study analyzed the impacts of MC capability on the power system transient stability. First, the transient stability was analyzed in relation to MC capability using the single-machine equivalent (SIME) method. A critical MC operating point (CMCOP) was then proposed to assess the severity of a transient impact and to secure the transient stability under the contingency conditions. A case study based on the Korean power system validated the feasibility and effectiveness of the proposed method.
由于逆变器的工作方式不同,基于逆变器的分布式发电机对异常电压和频率的响应不同于传统发电机。特别是,虽然瞬时停止(MC)模式是配电系统中必不可少的控制策略,但MC模式可以通过暂时停止大量IBDG发电来影响电力系统的暂态稳定性。为了减轻这些负面影响,本研究分析了MC能力对电力系统暂态稳定的影响。首先,利用单机等效(SIME)方法分析了暂态稳定性与MC能力的关系。然后提出了一个临界MC工作点(CMCOP)来评估瞬态冲击的严重程度,并确保应急条件下的瞬态稳定性。以韩国电力系统为例,验证了该方法的可行性和有效性。
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引用次数: 0
NERC TPL-001-4 Compliance Study: Application of A New Composite Load Model in Dynamic Voltage Assessment NERC TPL-001-4依从性研究:一种新的复合负载模型在动态电压评估中的应用
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9281597
Xiaokang Xu, Mohamed E. Elkhatib, Ming Wu
This paper presents a transient and dynamic voltage performance compliance study to demonstrate the compliance of the ITC transmission systems in Michigan with NERC TPL-0014 Standard. The study was focused on the Michigan Lower Peninsula area transmission systems. A new composite load model (CMLD) was parameterized, tuned and applied in the study as load modeling plays an important part in system voltage recovery following a disturbance. The study included testing CMLD for ITC’s 2019 and 2022 system summer peak load conditions with normal generation dispatch and stressed generation dispatch. Dynamic simulations were performed for a selected set of critical stability contingencies representing TPL001-4 P3, P4, P5, P6 and P7 contingency events. Corrective action plans such as adding a SVC were tested to mitigate voltage issues under such contingency events. Additionally, an extensive investigation of transient and dynamic voltage performance criterion currently implemented in various transmission entities such as ISOs/RTOs was conducted. Based on this investigation and dynamic simulation results, revisions to the current ITC transient/dynamic voltage recovery and dip criteria were recommended. This paper serves as a useful reference for other transmission systems in compliance with TPL-001-4 and for application of the new model CMLD.
本文提出了一项暂态和动态电压性能符合性研究,以证明密歇根州ITC输电系统符合NERC TPL-0014标准。这项研究的重点是密歇根州下半岛地区的输电系统。考虑到负荷建模在扰动后系统电压恢复中的重要作用,提出了一种新的复合负荷模型(CMLD),并进行了参数化、整定和应用。该研究包括在ITC的2019年和2022年系统夏季峰值负荷条件下,在正常发电调度和压力发电调度下测试CMLD。对TPL001-4、P3、P4、P5、P6和P7等关键稳定性事件进行了动态模拟。测试了诸如添加SVC之类的纠正措施计划,以缓解此类突发事件下的电压问题。此外,对目前在各种传输实体(如iso /RTOs)中实施的暂态和动态电压性能标准进行了广泛的调查。基于这一调查和动态模拟结果,建议修订现行的ITC瞬态/动态电压恢复和倾斜标准。本文可为其他符合TPL-001-4标准的传动系统及新模型的应用提供有益的参考。
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引用次数: 1
Dynamics and Protection in Cascading Outages 级联中断中的动态和保护
Pub Date : 2020-08-02 DOI: 10.1109/PESGM41954.2020.9281823
A. Flueck, I. Dobson, Zhenyu Huang, N. Eva Wu, Rui Yao, G. Zweigle
Understanding the interaction of relays with dynamics of a cascade is critical to the design of resilient power systems. Requirements include models of signal processing devices running complex protection algorithms and models of nonlinear power system dynamics, plus various uncertainties. This paper provides a brief overview of power system dynamics and protection, highlights recent cascading failures, covers existing modeling techniques, reviews typical simulation frameworks, and identifies open questions and gaps for future research and development for dynamics and protection in cascading outages.
了解继电器与级联动力学的相互作用对弹性电力系统的设计至关重要。要求包括运行复杂保护算法的信号处理设备模型和非线性电力系统动力学模型,以及各种不确定性。本文简要概述了电力系统动力学和保护,重点介绍了最近的级联故障,涵盖了现有的建模技术,回顾了典型的仿真框架,并确定了级联停电动力学和保护的未来研究和发展的开放性问题和差距。
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引用次数: 7
期刊
2020 IEEE Power & Energy Society General Meeting (PESGM)
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