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Impact of electric vehicles fast frequency regulation and charging strategies on grid frequency stability 电动汽车快速调频及充电策略对电网频率稳定性的影响
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.247
A. Ordoño, F. J. Asensio, J. I. San Martín, M. González-Pérez, J. Cortajarena
With the gradual reduction of grid inertia, system sensitivity to load unbalances is increasing, compromising frequency stability. To face this problem, faster frequency regulation resources are required. In this context, vehicle-to-grid (V2G) is one of the concepts that is suggested for this purpose. When electric vehicles (EVs) are parked, their batteries can be used as distributed energy storage systems (EESs), injecting and absorbing power faster than conventional generation units (CGUs). The goal of this paper is to analyse the impact of fast frequency regulation of EVs in a small-scale grid, under sudden load variations. In this paper, the effect of charging strategies (CSs) is addressed, as they have a direct impact on the magnitude of the EV fleet regulation. In this way, different CSs can be used to achieve symmetrical up and down regulation, or to maximize one of them. The effect of the EV fleet dynamics in the frequency transient is also studied. The speed of response, and hence, the frequency transient, are influenced by these dynamics. The focus of the analysis will be the communication delay between the EV fleet and the central controller.
随着电网惯性的逐渐减小,系统对负荷不平衡的敏感性不断提高,从而影响频率稳定性。为了解决这个问题,需要更快的频率调节资源。在这种情况下,车辆到电网(V2G)是为此目的提出的概念之一。当电动汽车(ev)停放时,它们的电池可以用作分布式储能系统(EESs),比传统的发电机组(cgu)更快地注入和吸收电力。本文的目的是分析在负荷突然变化的情况下,小型电网中电动汽车的快速频率调节的影响。本文讨论了充电策略(CSs)的影响,因为它们直接影响电动汽车车队监管的规模。通过这种方式,可以使用不同的CSs来实现对称的上下调节,或者最大化其中一个。研究了电动汽车车队动力学对频率暂态的影响。响应速度,因此,频率暂态,受这些动力学的影响。分析的重点将是电动汽车车队与中央控制器之间的通信延迟。
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引用次数: 0
Considerations about the measurement of electromagnetic emissions 关于电磁发射测量的考虑
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.241
M. Buzdugan
he main goal of the paper is to present procedures and analysis of the measurement that must be performed and the compulsory results to obtain compliance with conducted and radiated electromagnetic emissions. After the introductory section which outlines generalities related to electromagnetic compatibility (EMC), the second section focuses on the dichotomy between near-field and far-field, present in two important zones where electromagnetic phenomena are totally different, which however are not well enough highlighted in the specific EMC standards. The third section is devoted to emission measurements that must be performed in different electromagnetic environments and for different types of equipment depicted in the specific standards in force. As an example, the case of electromagnetic emissions produced by a household gas thermal power unit is presented.
本文的主要目的是介绍必须执行的测量程序和分析,以及获得符合传导和辐射电磁发射的强制性结果。在概述与电磁兼容性(EMC)相关的概括性的介绍部分之后,第二部分侧重于近场和远场之间的二分法,它们存在于两个重要的区域,其中电磁现象完全不同,但是在具体的EMC标准中没有很好地强调。第三部分专门讨论必须在不同电磁环境中进行的发射测量,以及针对现行具体标准中所描述的不同类型的设备进行的发射测量。以家用燃气热电机组产生的电磁辐射为例。
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引用次数: 0
Effect of Supply Unbalance on Harmonic Emissions of Uncontrolled SixPulse Rectifiers 供电不平衡对无控六脉冲整流器谐波发射的影响
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.377
G. Austin Taylor, M. Halpin
Standards dealing with power quality disturbances and emission limits for equipment and installations are constantly evolving as additional knowledge is gained. Often, each type of disturbance, such as harmonics, is considered individually and without regard for the possible effects of other types of disturbances, such as unbalance. The interdependencies between the disturbance phenomena are often disregarded. The work reported in this paper is focused on quantifying and correlating the effect of supply system unbalance on the harmonic emissions of the most basic harmonic-producing converter, the uncontrolled six-pulse rectifier. Six-pulse rectifiers with different loading conditions are supplied by sources with varying levels of unbalance to determine the effect of the unbalance on harmonic emissions via simulation. Different unbalanced supply conditions, all within credible levels, are considered and the effects on the harmonic emissions of the six-pulse rectifier are evaluated. The results of these simulations show that as source unbalance increases, THD and triplen harmonics also increase in a nearly-linear pattern. This type of relationship may be appropriate for consideration in the ongoing efforts in standardization related to both harmonics and unbalance so that more coordinated decisions can be made.
处理电能质量干扰和设备和装置的排放限制的标准随着获得更多的知识而不断发展。通常,每种类型的干扰(如谐波)都是单独考虑的,而不考虑其他类型的干扰(如不平衡)可能产生的影响。干扰现象之间的相互依赖性常常被忽视。本文的工作重点是量化和关联供电系统不平衡对最基本的谐波产生变流器——无控六脉冲整流器的谐波发射的影响。采用不同不平衡源提供不同负载条件下的六脉冲整流器,通过仿真确定不平衡源对谐波发射的影响。考虑了在可信水平内的不同不平衡供电条件,并评估了对六脉冲整流器谐波发射的影响。模拟结果表明,随着源不平衡的增加,三次谐波和三次谐波也以近似线性的方式增加。这种类型的关系可能适合在正在进行的与谐波和不平衡相关的标准化工作中加以考虑,以便能够做出更加协调的决策。
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引用次数: 1
An experimental facility for the development of a gravitational water vortex turbine 研制重力水涡涡轮的实验装置
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.447
J. Betancour, A. Rubio-Clemente, E. Chica
Gravitational water vortex turbine (GVT) is a run-of-the-river hydroelectric system used for generating electricity in the absence of a large dam and a reservoir; i.e., GVT generates power using the water natural flow rate. Recently, the development of GVT is gaining a growing interest within the scientific community concerning the advantages associated with the technology in the process of electric power production. This work describes the design of an experimental facility for the characterization of a GVT in order to understand in a detailed way the effect of the variation of hydrodynamic and geometric parameters on the performance curve of the turbine. The experimental results demonstrated that a wider vortex is generated at lower channel inflow velocities. Additionally, a maximum efficiency of 0.495 at 140.25 rpm was found for the GVT tested.
重力水涡轮机(GVT)是一种在没有大坝和水库的情况下用于发电的顺流水力发电系统;即GVT利用水的自然流速发电。最近,由于在电力生产过程中与技术相关的优势,GVT的发展在科学界引起了越来越大的兴趣。为了更详细地了解水动力参数和几何参数的变化对涡轮性能曲线的影响,本文描述了一种用于表征GVT的实验装置的设计。实验结果表明,在较低的通道入流速度下,会产生较宽的涡流。此外,在140.25 rpm时,GVT测试的最大效率为0.495。
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引用次数: 0
Analysis of Synthetic Inertia Applied to Wind Farms 应用于风电场的综合惯性分析
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.296
F. Mendes, F. Moura, M. Albertini, M. Mendonça, A. Rosentino, D. Rodrigues, R. Rimoldi de Lima, P. Rezende, G. Lima, J. O. Rezende
This work aims to understand and analyze how synthetic inertia influences in the Brazilian electrical system. With the increase of renewable sources, mainly with the increasing advancement in distributed generation, largely due to the increase in photovoltaic energy and also by wind power plants, both being controlled by electronic converters, the kinetic energy has decreased, thus causing instability in the system, when there is a failure of some bar, for example. For this reason, the study aims to study the synthetic inertia extracted through the blades of wind generators, analyzing the influence caused on the 14 bus system, applied to the SIN
这项工作旨在了解和分析综合惯性如何影响巴西电力系统。随着可再生能源的增加,主要是分布式发电的不断发展,很大程度上是由于光伏能源的增加以及风力发电厂的增加,两者都是由电子变流器控制的,因此动能减少,从而导致系统不稳定,例如当某些杆发生故障时。因此,本研究旨在研究通过风力发电机叶片提取的综合惯性,分析其对14母线系统的影响,并将其应用于sins
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引用次数: 0
Power Quality Analysis of Photovoltaic Systems 光伏系统电能质量分析
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.451
M. Barreto, A. Guananga, A. Barragán, E. Zalamea, X. Serrano
This research analyses the quality of the electricity produced on photovoltaic systems connected to the power grid in the city of Cuenca (Ecuador). For this, an overview of the literature and the Ecuadorian, American, and European regulations concerning power quality was carried out to determine the regulatory parameters and admissible limits. From the quality records, it is concluded that, in general, there are no power quality problems, except for momentary current imbalances. In one of the cases, violations of voltage parameters, voltage unbalance, current unbalance and flicker were found. The recommended parameters to be included in the Ecuadorian quality standards are individual harmonic distortion and frequency have been registered.
本研究分析了厄瓜多尔昆卡市连接到电网的光伏系统所产生的电能质量。为此,对文献和厄瓜多尔、美国和欧洲有关电能质量的法规进行了概述,以确定监管参数和可接受限值。从质量记录来看,总的来说,除了瞬时电流不平衡外,没有电能质量问题。在其中一个案例中,发现电压参数违反,电压不平衡,电流不平衡和闪烁。厄瓜多尔质量标准中建议的参数是已登记的单个谐波失真和频率。
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引用次数: 0
Assessing the effects of energy efficiency and different tariff policies on energy mix for decarbonization 评估能源效率和不同关税政策对脱碳能源结构的影响
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.385
D. Ferreira- Martínez, C. Barruso, A. López-Agüera
The objective of this work is to evaluate the effects of different energy policies designed to favor decarbonization by increasing renewable sources. In particular, the implementation of energy efficiency policies and the application of hourly differential electricity tariffs. The Open-Source Energy Modelling System (OSeMOSYS) has been adopted to visualize the effects of each of the actions in the short, medium, and long term, from 2024 till 2046. From our results, the application of hourly differentiation tariffs does not favor either the increase in the implementation of renewable sources or decarbonization processes. The implementation of energy efficiency policies (1-1.25% annual demand decrease), in the long term, allows to reach 80% of energy production from renewable sources. In all the scenarios, the energy sources with a greater level of intermittency, such as wind or solar, strongly increased their contribution in the medium-term, thereby stabilizing their long-term contribution. Finally, the implementation of photovoltaic solar energy becomes necessary only in the long-term. It seems clear that this contribution, up to 20% of the renewable, is associated with the nuclear blackout.
这项工作的目的是评估旨在通过增加可再生能源来促进脱碳的不同能源政策的影响。特别是能源效率政策的实施和每小时差别电费的应用。开源能源建模系统(OSeMOSYS)已被用于可视化从2024年到2046年的短期、中期和长期的每项行动的影响。从我们的研究结果来看,每小时差别关税的应用既不利于增加可再生能源的实施,也不利于脱碳过程。从长远来看,能源效率政策的实施(每年需求减少1-1.25%)可以使可再生能源的能源产量达到80%。在所有情景中,间歇性程度较高的能源,如风能或太阳能,在中期大大增加了它们的贡献,从而稳定了它们的长期贡献。最后,只有从长远来看,光伏太阳能的实施才有必要。很明显,这一占可再生能源20%的贡献与核停电有关。
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引用次数: 0
Modelling a Decarbonization Agenda for Bembibre’s Industrial Park 为本比伯工业园区建立脱碳议程模型
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.362
Mahamat Habib Bechir, R. R. Alor-Rodriguez, A. López-Agüera
The design of the Sustainable Strategy Agenda for the Bembibre industrial zone in the Bierzo region employing the Open-Source Energy Modeling System (OSeMOSYS) is presented. This municipality, which has been affected by the collapse of the coal mining industry, is at the epicentre of the reindustrialization and Just Transition (none left behind) initiatives of the Spanish government. Among the challenges to be tackled are the zone's entire decarbonization by 2030, the incorporation of circular economy initiatives, and the development of quality jobs that attract and retain new residents. To facilitate decision-making, different roadmaps have been evaluated, including the repurposing of an old coal mine galley as a reverse hydro storage system, the deployment of enterprises dedicated to the recycling of solar panels, and the incorporation of second-life batteries from electric vehicles as energy storage. Among the scenarios evaluated, the most complex turns out to be the most interesting. With an initial outlay of 190 M€, it incorporates a 210 MW photovoltaic park linked to a mixed storage system comprised of 0.25 GWh of reverse hydraulic systems and 68MWh of second life reconditioned batteries. About 850 jobs in the implementation stage and 70 more permanent in the exploitation phase are envisaged.
介绍了利用开源能源建模系统(OSeMOSYS)为比耶尔佐地区的本比布雷工业区设计可持续发展战略议程。该市受到煤炭采矿业崩溃的影响,是西班牙政府“再工业化”和“公正转型”(不让一个人掉队)倡议的中心。需要解决的挑战包括到2030年该地区的整体脱碳,纳入循环经济倡议,以及开发吸引和留住新居民的高质量工作。为了便于决策,已经评估了不同的路线图,包括将旧煤矿厨房重新用作反向水力储存系统,部署致力于太阳能电池板回收的企业,以及将电动汽车的二次电池作为能量储存。在被评估的场景中,最复杂的结果是最有趣的。该项目初始投资1.9亿欧元,包括一个210兆瓦的光伏公园,该公园与一个由0.25吉瓦时的反向液压系统和68兆瓦时的二次寿命修复电池组成的混合存储系统相关联。预计在执行阶段将提供850个工作岗位,在开发阶段将提供70个长期工作岗位。
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引用次数: 0
Consumption Prediction and Evaluation of Harmonic Distortion in a Hospital using Neural Networks 基于神经网络的医院谐波失真消费预测与评价
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.297
N. Tolentino, D. Borges, M. Albertini, L. P. Pires, F. A. Moura, M.V. Rezende, G. Lima, J. O. Rezende
This article aims to present a proposal for a methodology to analyze the energy efficiency of a hospital according to the current consumption obtained through field measurements. In addition, it aims to present the prediction of the increase in consumption over the years and correlate it with the possible increase in the harmonic distortion of stress. This analysis is essential for the studies of the connection impacts, allowing the estimation and evaluation of the energy quality through the harmonic voltage distortions over the years. The study is validated by comparing the consumption prediction curve obtained by Neural Network training with the data extracted from measurements and analysis of energy bills. The results show that the model generates the best prediction performance.
本文旨在提出一种方法的建议,以分析医院的能源效率,根据目前的消耗通过实地测量获得。此外,它的目的是提出的预测,在过去的几年里,在消耗的增加,并将其与可能增加的应力谐波畸变相关联。这种分析对于研究连接影响至关重要,可以通过多年的谐波电压畸变来估计和评估电能质量。通过将神经网络训练得到的用电量预测曲线与能源账单测量分析数据进行对比,验证了研究的有效性。结果表明,该模型具有较好的预测性能。
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引用次数: 0
Market Design for Cross-Border Co-Optimised Energy-Reserve Allocation 跨境能源储备协同优化配置的市场设计
Q4 Energy Pub Date : 2023-07-01 DOI: 10.24084/repqj21.289
I. Vokony, P. Sőrés, B. Nemeth, B. Hartmann
To achieve its energy goals, the European Union (EU) needs to establish a geographically large market by initially improving its cross-border electricity interconnections. The Hungarian project focuses on this topic. A geographically large market, based on imports and exports of electricity, could increase the level of competition, boost the EU’s security of electricity supply through creating alternative routes to the customers and integrate more renewables into energy markets. Electricity should, as far as possible, flow between Member States as easily as it currently flows within Member States, in order to increase sustainability potential and real competition, as well as to drive economic efficiency of the energy system. To this end, Facilitating Regional CROSS-border Electricity Transmission (FARCROSS) aims to address this challenge by connecting major stakeholders of the energy value chain and demonstrating integrated hardware and software solutions that will facilitate the “unlocking” of the resources for the cross-border electricity flows and regional cooperation. The targets of the project are to optimise the usage of the available cross-border capacity for reserve procurement while transitioning from ATC to Flow-based mechanism, to achieve simultaneous interconnector reservation for energy and balancing capacity to enable reserve market coupling and to create state-of-art technologies to materialise market coupling platforms.
为了实现其能源目标,欧盟(EU)需要通过初步改善其跨境电力互联来建立一个地域广阔的市场。匈牙利项目侧重于这一主题。一个基于电力进出口的大市场可以提高竞争水平,通过为客户创造替代路线来提高欧盟的电力供应安全,并将更多的可再生能源纳入能源市场。电力在会员国之间的流动应尽可能像目前在会员国内部流动一样容易,以便增加可持续性潜力和真正的竞争,并推动能源系统的经济效率。为此,促进区域跨境电力传输(FARCROSS)旨在通过连接能源价值链的主要利益相关者并展示集成硬件和软件解决方案来应对这一挑战,这些解决方案将有助于“解锁”跨境电力流动和区域合作的资源。该项目的目标是在从ATC向基于流量的机制过渡的同时,优化可用跨境储备采购能力的使用,同时实现能源互联储备和平衡能力,以实现储备市场耦合,并创造最先进的技术来实现市场耦合平台。
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引用次数: 0
期刊
Renewable Energy and Power Quality Journal
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