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Optimal distributed energy scheduling for port microgrid system considering the coupling of renewable energy and demand 考虑可再生能源与需求耦合的港口微电网系统最优分布式能源调度
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-08-13 DOI: 10.1016/j.segan.2024.101506
Chang Xiong , Yixin Su , Hao Wang , Danhong Zhang , Binyu Xiong

The increased uptake of distributed renewable energy in port areas is facilitating the electrification and net zero transition of marine ports. Effective operation that considers unique characteristics of the port is critical to minimize the operating cost in the port microgrid (PMG). In this paper, we propose a joint scheduling method that considers the impact of tidal patterns on the period and intensity of port operations. The method takes advantage of the strong correlations between renewable energy (solar, wind and tidal) and multi-class load to support the PMG operator in determining the most cost-effective scheduling of energy supply and flexible loads during port activities. Additionally, the traditional centralized operation is vulnerable to local failures, and distributed operation for hundreds of energy units will result in significant computational burden, neither of which is suitable for the PMG operation. Our work decouples the PMG system based on the port functions and thus decomposes the PMG operation into a few subproblems. Then, we hierarchically solve the primal and dual problems by a distributed algorithm. Simulation results illustrate the benefits of tidal energy in the renewable generation mix. Furthermore, the proposed method achieves cost reductions of 12.4% and 21.7% under two different tidal patterns.

港口地区越来越多地采用分布式可再生能源,这促进了海港的电气化和净零过渡。考虑到港口独特特性的有效运营对于最大限度降低港口微电网(PMG)的运营成本至关重要。在本文中,我们提出了一种联合调度方法,该方法考虑了潮汐模式对港口运营周期和强度的影响。该方法利用可再生能源(太阳能、风能和潮汐能)与多类负载之间的强相关性,支持港口微电网运营商在港口活动期间确定最具成本效益的能源供应和灵活负载调度。此外,传统的集中式运行容易受到局部故障的影响,而数百个能源单元的分布式运行会带来巨大的计算负担,这两种方式都不适合永磁发电机组的运行。我们的工作基于港口功能对永磁发电机系统进行解耦,从而将永磁发电机运行分解为几个子问题。然后,我们采用分布式算法分层求解原始问题和对偶问题。仿真结果表明了潮汐能在可再生能源发电组合中的优势。此外,在两种不同的潮汐模式下,所提出的方法分别降低了 12.4% 和 21.7% 的成本。
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引用次数: 0
Source-load coordinated dispatching model taking into account the similarity between renewable energy and load power 考虑到可再生能源与负载功率相似性的源-负载协调调度模型
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-08-13 DOI: 10.1016/j.segan.2024.101499
Jingjie Huang , Zhiyao Zhang , Liang Yuan , Hongming Yang , Zhaoyang Dong , Renjun Zhou

With the deployment of renewable energy, the load curve is expected to follow the renewable energy output curve to minimize the fluctuation of thermal power output in the source-load coordinated dispatching. The traditional indicators for the load curve are no longer enough to describe the load characteristics. A new load indicator called the source-load similarity distance is proposed by improving the similarity measurement method of the time series and calculating the similarity distance between the renewable energy output curve and the load curve. By combining the Euclidean distance with the improved dynamic time warping, the source-load similarity distance is obtained and the data distribution and morphological fluctuation characteristics can be simultaneously considered. The source-load coordinated dispatching model is also established to minimize the source-load similarity distance. The simulation results show that the source-load similarity distance can effectively describe the similarity characteristics of the renewable energy output curve and the load curve. Increasing the source-load similarity distance can reduce the thermal power operation cost by 56.2 % and the cost of demand response by 25.3 %, and increase the utilization rate of wind power by 4.6 % compared to the dispatching model with the standard deviation indicator.

随着可再生能源的部署,负荷曲线有望跟随可再生能源输出曲线,从而在源-荷协调调度中将火电输出的波动降至最低。传统的负荷曲线指标已不足以描述负荷特性。通过改进时间序列的相似性测量方法,计算可再生能源输出曲线与负荷曲线之间的相似性距离,提出了一种新的负荷指标--源-负荷相似性距离。通过将欧氏距离与改进的动态时间扭曲相结合,得到了源荷相似度距离,并可同时考虑数据分布和形态波动特征。同时还建立了源负载协调调度模型,以最小化源负载相似度距离。仿真结果表明,源荷相似度距离能有效描述可再生能源输出曲线与负荷曲线的相似性特征。与采用标准差指标的调度模型相比,提高源-荷相似度距离可降低火电运行成本 56.2%,降低需求响应成本 25.3%,提高风电利用率 4.6%。
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引用次数: 0
Electric vehicle supply equipment monitoring and early fault detection through autoencoders 通过自动编码器监测电动汽车供电设备并及早发现故障
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-08-13 DOI: 10.1016/j.segan.2024.101497
Maciej Sakwa , Alfredo Nespoli , Silvana Matrone , Sonia Leva , Alice Guerini , Andrea Demartini , Emanuele Ogliari

This paper presents a novel approach to detecting anomalies in Electric Vehicle charging unit power profiles using a combination of Autoencoders with LSTM techniques. This study presents a robust methodology, combining the two Machine Learning techniques, for early fault estimation in a real-world case study. The proposed methodology offers significant advantages over existing methods by providing a more comprehensive analysis of anomalous trends. To validate the effectiveness of the proposed methodology, the authors tested it on real Electric Vehicles charging power curves provided by an Italian Distribution System Operator recorded on a historical database and compared the performances with the ones of a traditional anomaly detection technique. The results of the study, tested on Electric Vehicles Supply Equipment or charging stations, demonstrate that the proposed approach is highly effective in detecting anomalous trends in Electric Vehicles charging profiles.

本文介绍了一种利用自动编码器与 LSTM 技术相结合检测电动汽车充电装置功率曲线异常的新方法。本研究介绍了一种结合两种机器学习技术的稳健方法,用于在实际案例研究中进行早期故障估计。通过对异常趋势进行更全面的分析,所提出的方法与现有方法相比具有显著优势。为了验证所提方法的有效性,作者对意大利配电系统运营商提供的真实电动汽车充电功率曲线进行了测试,该曲线记录在历史数据库中,并与传统异常检测技术的性能进行了比较。在电动汽车供电设备或充电站上进行的测试结果表明,所提出的方法在检测电动汽车充电曲线的异常趋势方面非常有效。
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引用次数: 0
Differentiable programming for gradient-based control and optimization in physical systems 物理系统中基于梯度控制和优化的可微编程
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-08-13 DOI: 10.1016/j.segan.2024.101495
Daniel López-Montero , Patricia Hernando-Sánchez , María Limones-Andrade , Adolfo García-Navarro , Adrián Valverde , Juan Manuel Sánchez Parra , Juan M. Auñón

This paper presents an exploration of the application of control theory, particularly utilizing a gradient-based algorithm, to automate and optimize the operation of photovoltaic panels and refrigeration systems in warehouse environments. The study emphasizes achieving coordination between energy generation and consumption, specifically harnessing surplus solar energy for efficient refrigeration. The complex interplay between fluctuating solar irradiance, thermal dynamics of the warehouse, and refrigeration needs underscores the significance of control theory in designing algorithms to dynamically adjust PV panel output and refrigeration system operation. The paper discusses foundational control theory principles, proposes a tailored framework for warehouse operations, and highlights the potential for sustainable energy practices. This paper explores the use of data-driven approaches based on NeuralODEs vs classical ones using physics equations.

本文探讨了控制理论的应用,特别是利用基于梯度的算法,自动优化仓库环境中光伏电池板和制冷系统的运行。研究强调实现能源生产和消费之间的协调,特别是利用剩余太阳能实现高效制冷。波动的太阳辐照度、仓库的热动态和制冷需求之间复杂的相互作用,凸显了控制理论在设计算法以动态调整光伏板输出和制冷系统运行方面的重要性。本文讨论了控制理论的基本原理,提出了针对仓库运营的定制框架,并强调了可持续能源实践的潜力。本文探讨了如何使用基于神经ODE 的数据驱动方法与使用物理方程的经典方法。
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引用次数: 0
On the model flexibility of the geographical distributed real-time co-simulation: The example of ENET-RT lab 关于地理分布式实时协同仿真的模型灵活性:以 ENET-RT 实验室为例
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-08-13 DOI: 10.1016/j.segan.2024.101501
A. Mazza , G. Benedetto , E. Pons , E. Bompard , A. De Paola , D. Thomas , E. Kotsakis , G. Fulli , S. Vogel , A. Acosta Gil , A. Monti , S. Bruno , C. Iurlaro , M. La Scala , A. Bonfiglio , P. Cepollini , F. D’Agostino , M. Invernizzi , M. Rossi , F. Silvestro , D. Villacci

The decarbonization of the energy sector represents a challenge that requires new tools and approaches of analysis. This paper aims to demonstrate the fundamental role that geographical distributed real-time co-simulations (GD-RTDS) can play in this regard. To this end, three different case studies have been analyzed with GD-RTDS, covering a wide range of applications for the energy sector decarbonization: (a) implementation of Renewable Energy Communities for supporting the share increase of Renewable Energy Sources, (b) the integration and management of Onshore Power Supply, and (c) the integration of a forecasting tool for the management of the Electric Vehicle charging. The performed experiments included fully simulated components, together with (power) hardware-in-the-loop and software-in-the-loop elements. These components have been simulated in different laboratory facilities in Italy and Germany, all operating in a synchronized manner under the presented geographically-distributed setup. The results show that the proposed architecture is flexible enough to be used for modeling all the different case studies; moreover, they highlight the significant contribution that the GD-RTDS methodology can give in informing and driving energy transition policies and the fundamental role of power systems to spearhead the complete decarbonization of the energy sector.

能源行业的去碳化是一项挑战,需要新的分析工具和方法。本文旨在展示地理分布式实时协同模拟(GD-RTDS)在这方面可以发挥的重要作用。为此,利用 GD-RTDS 分析了三个不同的案例研究,涵盖了能源行业去碳化的广泛应用:(a) 实施可再生能源社区,以支持可再生能源份额的增加;(b) 陆上供电的整合与管理;(c) 电动汽车充电管理预测工具的整合。所进行的实验包括完全模拟的组件,以及(电力)硬件在环和软件在环元素。这些组件已在意大利和德国的不同实验室设施中进行了模拟,所有组件均在提出的地理分布式设置下以同步方式运行。结果表明,所提出的架构非常灵活,可用于所有不同案例研究的建模;此外,这些结果还凸显了 GD-RTDS 方法在提供信息和推动能源转型政策方面所能做出的重大贡献,以及电力系统在引领能源行业全面去碳化方面所发挥的重要作用。
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引用次数: 0
A detection based on particle filtering and multivariate time-series anomaly detection via graph attention network for automatic voltage control attack in smart grid 基于粒子滤波和多变量时间序列异常检测的图注意网络检测,用于智能电网中的自动电压控制攻击
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-08-04 DOI: 10.1016/j.segan.2024.101494
Zhigang Lu , Guangxuan Zhao , Xiangxing Kong , Jianhua Chen , Xiaoqiang Guo , Jiangfeng Zhang
The Automatic Voltage Control (AVC) attack is a novel attack that targets voltage control instructions sent to generators from the dispatching center. A successful AVC attack can manipulate reactive power or terminal voltage of generators without being detected, causing the voltages of pilot buses to deviate from the reference values received from the dispatching center. This poses a threat to the safe and stable operation of power systems. This paper proposed a detection based on Particle Filtering (PF) and multivariate time-series anomaly detection via graph attention network (MTAD-GAT). Although each method can detect AVC attacks independently, the coordination of the two methods can be more effective. PF and MTAD are utilized to predict the voltage changes of the pilot bus in the next moment. To combine them, adaptive weights are employed, and an adaptive hybrid prediction can be calculated. The moment can be identified as attacked if the absolute value of the difference between the pilot bus voltage and the reference value exceeds a threshold automatically chosen by Peaks Over Thresholds (POT) theory. The proposed method has been validated through simulations on the IEEE 39-bus 6-partition Coordinated Secondary Voltage Control (CSVC) system and has shown to be effective.
自动电压控制(AVC)攻击是一种新型攻击,其目标是调度中心发送给发电机的电压控制指令。成功的自动电压控制攻击可在不被发现的情况下操纵发电机的无功功率或终端电压,导致试点母线的电压偏离从调度中心接收的参考值。这对电力系统的安全稳定运行构成了威胁。本文提出了一种基于粒子滤波(PF)和图注意网络多变量时间序列异常检测(MTAD-GAT)的检测方法。虽然每种方法都能独立检测 AVC 攻击,但两种方法的协调使用会更加有效。PF 和 MTAD 可用于预测试点总线下一时刻的电压变化。将这两种方法结合起来,采用自适应权重,就能计算出自适应混合预测。如果先导母线电压与参考值之差的绝对值超过了根据峰值过阈值(POT)理论自动选择的阈值,则该时刻可确定为攻击时刻。通过在 IEEE 39 总线 6 分区协调二次电压控制 (CSVC) 系统上进行仿真,验证了所提方法的有效性。
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引用次数: 0
Coordination of solar battery hybrid power plants and synchronous generators for improving black start capability 协调太阳能电池混合发电厂和同步发电机,提高黑启动能力
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-08-02 DOI: 10.1016/j.segan.2024.101489
Michael Beck, M.J. Hossain

Renewable generation utilizes inverter-based technology which is much different than the coal and nuclear synchronous machines it is replacing. The electrical network was designed around big synchronous machines providing constant dispatchable power and innate inertia to dampen frequency disturbances. The network protection system is based on high available fault current provided by the big generators. The renewable plants have a variable fuel supply, no inertia, and provide less fault current for system protection. A hybrid power plant with renewables, energy storage, and a synchronous generator can play a significant role in restoring power system operation after the occurrence of a blackout. This paper presents an improved method to utilize inverter-based resources (IBR) with existing synchronous generation to improve the black start capability while minimizing the overall system’s operation cost and providing additional ancillary grid services. A battery energy storage system is modeled with grid forming inverters to provide black start to the synchronous unit while the solar is modeled with grid following inverters. A Long-Short Term Memory (LSTM) is developed to model the auxiliary load for reducing the fuel consumption in synchronous generators and reducing the cost. Several case studies are conducted to verify the performance of the grid forming inverters with battery storage to start the largest direct online (DOL) and soft start motors. Utilizing actual synchronous generator auxiliary load data for a year, a quasi-dynamic simulation analysis is performed to determine energy storage requirements for black start. Finally, the energy benefits of the solar installation are estimated from simulating the hybrid system for 1 year. A reduced fuel burn simulation is performed by constraining the export power to the actual data and reducing synchronous generation to account for the solar generation and the reduced auxiliary load. The study finds that the IBR resources are capable of successfully black starting the synchronous generator and reducing fuel consumption and earning additional revenue from the solar plants.

可再生能源发电利用的是基于逆变器的技术,这与它所取代的煤炭和核能同步机器有很大不同。电网是围绕大型同步电机设计的,这些同步电机可提供恒定的可调度功率,并具有抑制频率干扰的固有惯性。电网保护系统基于大型发电机提供的高可用故障电流。可再生能源发电厂的燃料供应可变,没有惯性,为系统保护提供的故障电流较小。由可再生能源、储能和同步发电机组成的混合发电厂可在停电后恢复电力系统运行方面发挥重要作用。本文提出了一种改进的方法,利用基于逆变器的资源(IBR)和现有的同步发电机来提高黑启动能力,同时最大限度地降低整个系统的运行成本,并提供额外的辅助电网服务。电池储能系统的建模采用电网形成逆变器,为同步装置提供黑启动,而太阳能系统的建模采用电网跟随逆变器。开发了一种长短期记忆(LSTM)来模拟辅助负载,以减少同步发电机的燃料消耗并降低成本。进行了几项案例研究,以验证带有电池储能的并网逆变器在启动最大的直接在线(DOL)和软启动电机时的性能。利用一年的实际同步发电机辅助负载数据,进行了准动态模拟分析,以确定黑启动的储能需求。最后,通过对混合动力系统进行为期一年的模拟,估算出太阳能装置的能源效益。通过将输出功率限制在实际数据范围内,并减少同步发电量以考虑太阳能发电和减少的辅助负荷,进行了减少燃料燃烧模拟。研究发现,IBR 资源能够成功黑启动同步发电机,减少燃料消耗,并从太阳能发电厂获得额外收入。
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引用次数: 0
Dynamical heterogeneity and universality of power-grids 电网的动态异质性和普遍性
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-07-30 DOI: 10.1016/j.segan.2024.101491
Bálint Hartmann , Géza Ódor , István Papp , Kristóf Benedek , Shengfeng Deng , Jeffrey Kelling

Electric power systems during transient states are extensively investigated using variations of the Kuramoto model to analyze their dynamic behavior. However, the majority of current models fail to capture the physics of power flows and the heterogeneity of the grids under study. This study addresses this gap by comparing the levels of heterogeneity in continent-sized power grids in Europe and North America to reveal the underlying universality and heterogeneity of grid frequencies, electrical parameters, and topological structures. Empirical data analysis of grid frequencies from the Hungarian grid indicates that q-Gaussian distributions best fit simulations, with spatio-temporally correlated noise evident in the frequency spectrum. Comparing European and North American power grids reveals that employing homogeneous transmission capacities to represent power lines can lead to misleading results on stability, and nodal behavior is heterogeneous. Community structures of the continent-sized grids are detected, demonstrating that Chimera states are more likely to occur when studying only subsystems. A topographical analysis of the grids is presented to assist in selecting such subsystems. Finally, synchronization calculations are provided to illustrate the occurrence of Chimera states. The findings underscore the necessity of heterogeneous grid models for dynamic stability analysis of power systems.

人们广泛使用 Kuramoto 模型的变体来研究瞬态期间的电力系统,以分析其动态行为。然而,目前的大多数模型都无法捕捉电力流的物理特性和所研究电网的异质性。本研究通过比较欧洲和北美大陆规模电网的异质性水平,揭示了电网频率、电气参数和拓扑结构的基本普遍性和异质性,从而弥补了这一不足。对匈牙利电网的电网频率进行的经验数据分析表明,q-高斯分布最适合模拟,频谱中明显存在时空相关的噪声。对欧洲和北美电网进行比较后发现,采用同质输电容量来表示电力线可能会导致误导性的稳定性结果,而且节点行为也是异质的。对各大洲电网的群落结构进行了检测,表明在仅研究子系统时更有可能出现 Chimera 状态。网格的地形分析有助于选择此类子系统。最后,还提供了同步计算,以说明 Chimera 状态的发生。研究结果强调了异构电网模型在电力系统动态稳定性分析中的必要性。
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引用次数: 0
Multi-stage optimization placement of DPMUs based on node metric indices 基于节点度量指数的 DPMU 多级优化布局
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-07-30 DOI: 10.1016/j.segan.2024.101488
Junjie Lin , Haoyu Chen , Changxu Jiang , Kunyu Han , Xinchi Wei , Chen Fang

The proliferation of distributed energy resources and the introduction of new loads in distribution networks present significant challenges for monitoring and operation. To satisfy the enhanced observability and controllability requirements of modern distribution networks, there is an increasing demand for advanced monitoring devices. Distribution Network Phasor Measurement Units (DPMUs) offer high-precision measurement data with precise timestamps, thereby improving both the accuracy and redundancy of measurements within the distribution network.This paper introduces an optimization model for the strategic placement of PMUs within distribution networks, leveraging node metric indices. The indices considered are node degree, spatiotemporal correlation, and node power ratio. The relative importance of these indices is determined using an improved entropy weight method, which quantifies the differentiation of nodes within the network. This method facilitates the prioritized placement of DPMUs at critical nodes. The proposed model also incorporates constraints such as the depth of unobservability and zero injection nodes. Utilizing a 0–1 integer programming algorithm, the model derives a multi-stage optimal placement scheme for PMU placement. This scheme evolves from incomplete observability to critical observability and ultimately to full redundancy. Importantly, this approach allows for the monitoring of key nodes within the distribution network and enhances measurement redundancy without necessitating an increase in the number of placements.

分布式能源资源的激增以及配电网络中新负载的引入,给监控和运行带来了巨大挑战。为满足现代配电网对可观测性和可控性的更高要求,对先进监控设备的需求日益增长。配电网相量测量单元(DPMU)可提供具有精确时间戳的高精度测量数据,从而提高配电网内测量的准确性和冗余性。考虑的指标包括节点度、时空相关性和节点功率比。这些指标的相对重要性是通过改进的熵权法确定的,该方法可量化网络内节点的差异。这种方法有助于在关键节点优先放置 DPMU。所提出的模型还纳入了不可观测深度和零注入节点等约束条件。利用 0-1 整数编程算法,该模型得出了 PMU 布置的多阶段优化布置方案。该方案从不完全可观测性发展到临界可观测性,最终达到完全冗余。重要的是,这种方法允许对配电网络中的关键节点进行监控,并在无需增加安置数量的情况下增强了测量冗余度。
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引用次数: 0
Cost-efficient microgeneration renewable energy provision dimensioning for sustainable 5G heterogeneous network 为可持续的 5G 异构网络设计具有成本效益的微发电可再生能源供应尺寸
IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Pub Date : 2024-07-30 DOI: 10.1016/j.segan.2024.101493
Adil Israr , Qiang Yang , Ali Israr

The deployment of mobile networks has imposed an urgent requirement for the pursuit of low-carbon communication infrastructures. The increasing energy consumption of mobile networks has brought about challenges of techno-economic and environmental sustainability. Renewable energy-enabled mobile networks have received a lot of attention due to their capability to evade greenhouse gas emissions and easy availability. Microgeneration-based renewable energy provision is a feasible and effective solution for 5G networks. Dimensioning of microgeneration renewable energy power supply is an essential issue to make the system operate for a long period cost-effectively with a minimum amount of grid energy consumption. For effective deployment of microgeneration renewable energy system, it is essential to provision it with adequate PV panel capacity and storage devices. This work attempts to identify the cost-effective, energy-efficient, and emissions-aware sizing of PV panels and storage for 5G HetNet. An energy-saving strategy based on an optimal policy of advanced sleep modes and traffic-aware load offloading is developed and the interaction of the energy-saving strategy on the system dimensioning is explicitly examined. The proposed solution aims to ensure the communication quality of service whilst keeping the optimal cost-effective deployment and network operation. The system performance in terms of grid energy consumption, empty storage probability, emission performance, and total cost of the system is extensively assessed through experiments for a range of operational scenarios. The numerical results demonstrated that the proposed sustainable energy system dimensioning and operation integrated with an energy-saving strategy is energy-efficient and cost-effective.

移动网络的部署对追求低碳通信基础设施提出了迫切要求。移动网络日益增长的能耗带来了技术经济和环境可持续性的挑战。可再生能源移动网络因其避免温室气体排放的能力和易于使用而受到广泛关注。基于微发电的可再生能源供应是 5G 网络可行且有效的解决方案。要使系统以最低的电网能耗、经济高效地长期运行,微发电可再生能源供电的尺寸设计是一个至关重要的问题。为了有效部署微型可再生能源发电系统,必须为其配备足够的光伏板容量和存储设备。本研究试图为 5G HetNet 确定具有成本效益、高能效和排放感知的光伏电池板和存储设备的尺寸。基于高级睡眠模式和流量感知负载卸载的最优策略,开发了一种节能策略,并明确研究了节能策略与系统尺寸的相互作用。所提出的解决方案旨在确保通信服务质量,同时保持最佳的成本效益部署和网络运行。通过对一系列运行场景进行实验,从电网能耗、空存储概率、排放性能和系统总成本等方面对系统性能进行了广泛评估。数值结果表明,建议的可持续能源系统尺寸和运行与节能策略相结合,既节能又符合成本效益。
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引用次数: 0
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Sustainable Energy Grids & Networks
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