配网线损同期化计算与多维分析系统

主要针对当前配网线损计算缺乏线路数据、线损数据不同期、缺乏异常线损定位与线损原因判别等现状,提出一种用于10 kV配网线损同期化计算与多维分析系统。一方面,该系统将高压计量等新型传感器应用于配电10 kV架空线路与电缆线路各分支节点,解决了当前配电网无法获取线路数据的难题;另一方面,结合各测点实时数据集,提出同期化线损计算方法、线损异常分段的定位方法以及多维度线损相关性分析方法,对线损异常分段各数据集进行相关性分析,给出线损异常的可能原因,辅助电力用户进行线损问题排查。通过在试验线路中对该系统的应用,验证了所提方法的有效性。     

河南电网线损管理系统实践及应用

为积极响应国家节能减排政策号召,提升公司线损管理水平,河南省电力公司启动了河南电网线损管理系统建设项目。该项目实现了理论线损在线计算、线损“四分”管理、降损辅助决策支持、线损分析等八大功能,并在运行过程中不断论证,形成了适合河南电网的线损管理系统应用模式。主要介绍河南省电力公司近年来线损工作的现状以及线损管理系统的框架体系、功能实现及实践应用等。     

基于CIM的66 kV输电网线损 管理系统技术方案

随着IEC61970标准的颁布,为电力系统的各种资源定义了公共信息模型(CIM：Common lnformation Model),提供 了一种用对象类和属性及彼此关联关系来表示电力系统资源的标准方法。采用统一命名规范和标准编码机制,在对CIM模型合并、扩展的基础上实现各类线损对象的自动建立和数据源的自动关联,建立输电网电量数据整合平台,以现有数据源系统为基本的采集子系统,实现各数据源系统的接口,实现电量系统相关业务流程,最后实现线损数据的统计和分析。     

低压配电网的结构特点与理论线损计算

为了提高低压台区理论线损计算的准确性和实用性,提出了一种适合于低压台区计算的前推回代法。计算时只需提供用户台区的网架结构、电量特征等参数,即可形成实用的低压台区计算方法。由于考虑了线制和电压降对线路线损的影响,从而避免了使用等值电阻法计算时实际运行偏离设定条件而造成较大计算误差的不足。通过台区实例计算,验证了此方法合理、可行,并获得较高的计算准确度,可为电力公司开展低压台区理论线损计算提供依据。     

基于负荷分类的配网线损自动检测方法设计

常规的配网线损自动检测方法主要通过线损轨迹矩阵确定线损变化分量,易受线损数据波动影响,导致线损检测偏差过高,因此需要基于负荷分类设计一种全新的配网线损自动检测方法。即建立属性集,校核配网线损数据质量,再利用负荷分类法自动测算配网线损率,从而实现配网线损自动检测。实验结果表明,设计的基于负荷分类的配网线损自动检测方法的检测偏差较小,检测效果较好,具有准确性,有一定的应用价值,为优化配电网结构作出了一定的贡献。     

基于弃风弃光同步消纳的荷网源协调思路与实时消纳电量评估方法研究

针对我国弃风弃光问题,提出了一种荷网源协调实时同步消纳的流程思路,以及弃风弃光电量实时消纳评估方法。文章从分析弃风弃光原因入手,在考虑国家及地区政策基础上,对荷网源协调实时匹配消纳弃风弃光模式进行研究,并设计了一套协调方法,通过对放弃电量、消纳电量等评价指标的取值与计算方法、物理意义及应用方法的研究,形成考虑电网消纳能力情况下的弃风弃光消纳增量评估方法,该评估方法可以面向计划类与直控类消纳类型,为弃风弃光协调消纳提供合约机制中消纳电量评估支撑,最终通过案例模拟展示评估方法的实际用法。     

基于改进聚类和RBF神经网络的台区电网线损计算研究

电网线损是反映低压台区配电网输配电性能好坏的重要技术指标,针对低压台区线损计算不精确和效率不高的问题提出了一种有效的计算方法,即基于改进K-Means聚类和正交最小二乘法(OLS)优化的径向基(RBF)神经网络计算模型.首先通过层次分析法(AHP)对线损的电气指标进行提取,根据得到的线损指标用改进的K-Means聚类算...     

基于边缘计算的配网管理和运维体系研究

针对目前配网管理和运维体系滞后、管理不善的问题,提出了新型的管理和运维体系架构。该研究基于边缘计算技术,构建出基于“云、管、边、端”4层架构的管理系统,更具体地说,该系统包括终端层、边缘设备层、信息化管理层和云端管理层,该系统能够计算出配电网系统中分布广泛、繁多的数据。通过在系统中构建出包括MEC虚拟化基础设施层、MEC平台层和MEC应用层的移动边缘计算平台,用户能够及时处理、应用平台内的数据。通过边缘计算,能够直观地反映数据库中的不同参数与边缘计算系统间的耦合关系,计算出影响配网管理和运维的不同参数,进而适时评估电力配网系统的运行状态。试验表明,基于边缘计算的配网系统优于传统的物联网技术、监测设备和人工计算方法。     

基于K-Means聚类和改进多分类相关向量机的台区线损计算方法

配电网线损计算是配电网线损管理和分析的一项重要技术措施.针对传统配电网理论计算不能自动实现、工作量大、计算结果不准确等问题,提出了一种基于K-Means聚类和果蝇算法优化多分类相关向量机(Multi classification correlation vector machine,MRVM)的快速计算低压台区线损计算...     

配电网线损理论计算方法比较研究

对目前存在的配电网线损计算方法进行了详细分析,比较了各种方法的应用范围和局限性,并考虑了三相潮流不对称情况下的线损计算。     

An energy management approach for renewable energy integration with power generation and water desalination

The share of the renewable energy sources (RES) in the global electricity market is substantially increasing as a result of the commitment of many countries to increase the contribution of the RES to their energy mix. However, the integration of RES in the electricity grid increases the complexity of the grid management due to the variability and the intermittent nature of these energy sources. Energy storage solutions such as batteries offer either short-term storage that is not sufficient or longer period storage that is significantly expensive. This paper introduces an energy management approach which can be applied in the case of power and desalinated water generation. The approach is based on mathematical optimization model which accounts for random variations in demands and energy supply. The approach allows using desalination plants as a deferrable load to mitigate for the variability of the renewable energy supply and water and/or electricity demands. A mathematical linear programming model is developed to show the applicability of this idea and its effectiveness in reducing the impact of the uncertainty in the environment. The model is solved for the real world case of Saudi Arabia. The optimal solution accounts for random variations in the renewable energy supply and water and/or electricity demands while minimizing the total costs for generating water and power.     

Optimal centralized integrated energy station site approach based on energy transmission loss analysis

Centralized integrated energy station, which combines electrical power, gas, and heat supplying source together, is emerging with the development of an integrated energy system. In the previous works, the site optimization approaches of energy stations were developed for electrical power and gas sources. In these approaches, the candidate sites only include user nodes. However, with the development of the integrated energy system, the previous approach cannot be applied effectively for the system containing heating networks with high energy transmission loss. The energy transmission loss must be calculated accurately in the optimization approach rather than valued by the simple linear model. This paper aims to propose an optimal site approach of a centralized integrated energy station, in which all possible candidates of energy station sites are considered. The candidates can be any point in the whole energy supplying area. The analysis of energy transmission losses, based on nodal energy flow models, in pipelines and feeders, are incorporated. The simultaneous optimization of the station site and energy distribution networks is conducted. It is found that the energy transmission loss is significant in heating networks; therefore, network optimization should be carried out considering exact energy transmission loss. The optimal station site obtained in the present work has reduced 2.3% of the life cycle cost much more than that obtained from the previous method selecting a site from the user node. A noticeable reduction in life cycle cost, 2.6%, can also be achieved when using the proposed approach for a single energy source station. Moreover, for integrated energy systems, it is found that the adoption of the centralized integrated energy stations is more competitive comparing with the adoption of the single energy source station.     

An energy system for the integration of renewable energy with energy storage in a frigid plateau region

面向高原高寒地区对稳定供热和供电的迫切需求,本文提出了一种新型的可再生能源与储能集成供能系统。该系统包括风力发电、光伏发电、水力发电、槽式太阳能集热器、储热系统、储电装置以及集成控制系统,实现了多种可再生能源高效利用;制定了一种考虑热电设备性能的实时能量管理策略,并建立了以年成本为主要优化目标的容量配置方法;利用该系统与优化方法对高原高寒地带民用住宅群的供能系统进行了优化设计,通过案例对比分析,验证了该集成供能系统容量配置方法和能量管理策略的可行性。研究结果为高原高寒地区供能系统的选择提供了有益的参考。     

常减压装置能耗分析与节能途径探讨

镇海炼油化工股份有限公司3套常减压装置经过改造，综合能耗达到10．7kg标油／t的国内先进水平，然而与《基准能耗》相比，仍有一定差距。文章从能量的转换、工艺利用、回收3个环节对装置能耗进行入深入分析，在工艺操作上、换热流程优化上提出进一步降低能耗的措施。     

对供电标准煤耗率计算公式的探讨

分析了系统中火用的不等价性,导出以初始火用为基准的供电煤耗率计算式。此方法克服了传统热力学的局限,把热力学和经济学有机结合起来,从而有利于科学地挖掘电厂的节能潜力。     

Optimal dispatch of HCNG penetrated integrated energy system based on modelling of HCNG process

Hydrogen is injected into the existing natural gas network to form hydrogen-rich compressed natural gas (HCNG), effectively addressing the high cost of hydrogen transmission. However, the traditional IES model cannot be used due to the hydrogen injection's effect on gas properties and the vague characteristics of the transport and separation processes. Therefore, this paper proposes an HCNG penetrated integrated energy system (HPIES) optimal dispatching method by comprehensively modelling the injection, transmission, and separation processes of HCNG. An HCNG mass flow rate model considering variable mixing ratio and unknown beginning flow direction is developed to describe the effect of hydrogen injection. Furthermore, the hydrogen separation model is established by introducing a combined membrane and pressure swing adsorption separation process. The tightening McCormick algorithm is proposed to solve quickly HPIES optimal dispatch problem with an acceptable feasibility check. Finally, case studies on the HPIES consisting of IEEE 39-bus power system and 20-node natural gas system validate the effectiveness of the algorithm and model. The results show that the average error is 0.031% for the bilinear term constraint.     

住宅区电气节能设计的几个途径

本文从变压器选择、配电系统和绿色照明等三个方面讨论了住宅小区节能设计的方法及实现的途径。     

Analysis of access mode and control strategy of distributed energy storage system on user side

分布式储能系统在电力用户侧中的应用日益广泛,且应用场景多样化,对于电网来说是潜在的优良资源。然而其容量小、数量多、分布不均衡、单机接入成本高、系统操作及管理困难,给电网的规划运营带来了日益严峻的挑战和技术难题。本文就用户侧中的分布式储能典型应用模式及接入方式进行介绍,阐述各应用场景下分布式储能的应用模式和方案,并分析了典型应用场景下的分布式储能运行效果。通过对分布式储能系统技术形态和载体的分析,可为进一步研究分布式储能汇聚协调控制技术提供理论指导。     

节能评估报告中电能消耗的计算方法

根据近几年国家节能评估报告的编制要求,通过工程实例详细介绍了节能评估报告中电气专业电能消耗的计算方法,并提出无功补偿后,采用加权平均算法,重新进行负荷计算,再进行设备年耗电量的计算方法。加权平均算法还可应用于不同产品、不同工段的耗电量的计算。利用不同耗电设备所占比重不同,采用加权平均的算法,使节能评估报告中的计算结果更加科学、准确,更为接近项目的实际电能消耗量。