Study on Comprehensive Efficiency Evaluation of Rural Power Grid under Rural Revitalization Strategy Considering Regional Differences

As an essential infrastructure,the rural power grid is vital in promoting agricultural and rural carbon sequestration and improving rural energy electrification.It is necessary to carry out in-depth research on its comprehensive efficiency.Based on the requirements of“double carbon”and rural revitalization strategy for the rural Power Grid,this paper focuses on the modernization and low-carbon transformation of the rural Power Grid.It constructs an input-output index system for the investment efficiency of the rural Power Grid in China under the new situation.It uses the primary data of the rural Power Grid of 30 prefecture-level cities in China from 2019 to 2021 to evaluate the investment efficiency of the rural Power Grid in China through a three-stage DEA model.The empirical results show that:considering the regional differences,the comprehensive efficiency of the rural Power Grid in backward areas is significantly improved;that is,the three-stage DEA method can more objectively evaluate the comprehensive efficiency of the rural Power Grid.In the context of the continued promotion of the rural revitalization strategy,to improve the comprehensive efficiency of the rural Power Grid,it is necessary to improve the technical level of the rural Power Grid further and appropriately expand the scale of investment in the rural Power Grid.

Improved VSVPWM Modulation Method for Three-level NPC Inverter in Rural Power Grid

With the acceleration of agricultural electrification,a lot of nonlinear and shock loads appear in the rural power grid,and the resulting harmonic and reactive currents pollute the rural power grid more and more seriously.To solve the above problem,three-level neutral point clamped(NPC)inverters have been widely used,but their development is greatly restricted by the defect of neutral point voltage imbalance.In this paper,an improved virtual space vector pulse width modulation(VSVPWM)was proposed.Firstly,the mathematical models of various space vectors were established,and the influence of various space vectors on neutral point voltage was analyzed.The sum of the vector current at the neutral point was zero and the voltage control at the neutral point was completed by.introducing the time offset into different switching times of the redundant small vector.This method was simple in design and avoided the redundant calculation of the traditional VSVPWM method and tedious switch sequence design.This balancing control strategy could greatly reduce the influence of virtual vectors on neutral point voltage and effectively control the low-frequency oscillation of neutral point voltage.The validity of the method was verified by establishing a matlab simulation model.

Some Technical Proposals on Rural Power Grid Construction and Retrofit

In consideration of high investment, large scope, longperiod and arduous tasks of rural power garid construction andretrofit, this paper analyzes the present state of China’s ruralpower grids and the difficulties on the construction and retrofit,for which some technical proposals are put forward.

Analysis and management strategies for the low voltage problems of rural power grid based on the distribution network flow calculation method

For a long time, because of the lack of investment capital and enough attentions, the overall constructions of rural power grid were far behind than the urban power grid in Chongqing Jiangbei Power Company. The low voltage problems were highlighted in the rural power grid due to the characteristics of rural power grid. Using the distribution network flow calculation method, we evaluated the low voltage problems of the rural power grid which belongs to Chongqing Jiangbei Power Company. In addition, we collected the data of distribution transformers in electricity consumption peak period. Some practical management strategies were proposed by the analysis and evaluation of potential and appeared low voltage problems.

Research and Application of Distributed Data Mining Method for Improving Rural Power Grid Enterprises in Production and Operation Status Evaluation

With the reform of rural network enterprise system,the speed of transfer property rights in rural power enterprises is accelerated.The evaluation of the operation and development status of rural power enterprises is directly related to the future development and investment direction of rural power enterprises.At present,the evaluation of the production and operation of rural network enterprises and the development status of power network only relies on the experience of the evaluation personnel,sets the reference index,and forms the evaluation results through artificial scoring.Due to the strong subjective consciousness of the evaluation results,the practical guiding significance is weak.Therefore,distributed data mining method in rural power enterprises status evaluation was proposed which had been applied in many fields,such as food science,economy or chemical industry.The distributed mathematical model was established by using principal component analysis(PCA)and regression analysis.By screening various technical indicators and determining their relevance,the reference value of evaluation results was improved.Combined with statistical program for social sciences(SPSS)data analysis software,the operation status of rural network enterprises was evaluated,and the rationality,effectiveness and economy of the evaluation was verified through comparison with current evaluation results and calculation examples of actual grid operation data.

考虑乡村振兴贡献度的农网项目投资决策模型

深入推进乡村振兴战略对农村电网发展提出更高要求,量化新时代农网项目贡献度,辅助农网实现精准投资成为关键。基于乡村振兴战略对现代农村电网发展提出的新要求,构建包含安全可靠、精准服务、绿色低碳、数字智能等4个维度的农网贡献度评价指标体系,采用最小交叉熵模型融合完全一致性方法(FUCOM)-变异系数法赋权系数对指标进行组合赋权,运用加权马氏距离TOPSIS法量化农网贡献度。以农网单位投资贡献度最优及财务效益最大为目标,构建农网项目投资决策模型,并基于c-DPEA算法进行求解。某县某批次20个农网项目的算例仿真结果表明,所提量化模型能科学评价农网项目贡献度,投资决策模型能为农网实现精准投资提供有效参考。

乡村振兴战略下农网综合效益评价模型研究

农村地区之间存在着显著的地区差异,为了指导农村电网投资,提出一种基于组合赋权和多属性边界逼近区域比较法(multi-attributive border approximation area comparison,MABAC)的差异化农网综合效益评价模型。首先,综合考虑农村地区差异及乡村振兴战略对农网发展的要求,从农网投资经济效益、供电能力、基础设施情况、地区发展带动、生产生活质量、清洁低碳发展等6个方面构建农网综合效益评价指标体系;其次,基于最小化主客观权重异质性原则构建基于图模型—熵权法的组合赋权模型,并引入MABAC方法用于解决农网综合效益评价问题;最后,通过算例分析验证了所提出模型的有效性。

新能源电动农机一源多用创新供能赋能农网农机融合发展——基于全国536份调查问卷分析

随着我国“三电”技术的快速发展,新能源电动农机也如雨后春笋般迅速崛起,一源多用的提出是解决新能源电动农机季节性闲置、利用率低、无法与农村电网(以下简称农网)新型电力系统互动融合等问题的创新发展模式,具有用能清洁环保、数智化程度高、易于组网的现代化技术特征。针对新能源电动农机一源多用的关键技术、应用场景、实施路径和商业模式等存在问题与发展前景,面向农机、农业、电力和电网等相关从业人员开展网络问卷调研,从一源多用技术发展潜力和农网农机融合认知态势等视角,基于调研结果,研究了一源多用赋能农网农机融合的农机电能替代潜力、应用场景、综合效益等,分析了一源多用的实施路径和商业模式,提出了一源多用创新供能模式赋能农网农机融合的关键技术和扶持政策建议。结果表明,新能源电动农机一源多用发展模式具有较好经济效益和环保效益,发展前景被普遍看好,对落实双碳目标与乡村振兴战略具有积极意义。未来仍需开展新能源电动农机和电网融合互动关键技术协同攻关和应用研究,探索可持续且多方共赢的良性商业模式。

农村配电网的规划策略分析

阐述农村配电网规划建设的特征、问题及原因,提出改进建议,包括合理规划农村电网结构、加快健全农村配电网规划制度与技术导则、加强实地勘测、根据用电需求进行规划设计。

基于改进图时间卷积网络的农村地区电动汽车充电负荷预测及其对农网的影响

在新能源汽车下乡政策的有力引导下,电动汽车在农村地区的销量快速增长,然而农村电网地域分布广、供电线路长,充电负荷相对分散且难以预测。为此,提出了基于改进图时间卷积网络的农村地区电动汽车充电负荷预测模型。首先,基于图卷积网络构建农村电网图结构矩阵,以表征用户充电特征的空间信息并降低输入数据的维度。其次,引入时间卷积网络感知充电数据的时序信息,挖掘影响负荷预测的时序特征。然后,提出基于注意力机制的改进图时间卷积网络算法进行充电需求预测,对不同特征进行权重分配,提升模型对时空信息的融合学习能力。最后,基于算例结果验证所提方法在农村地区电动汽车充电负荷预测上的有效性,并进一步分析了不同电动汽车渗透率下充电负荷对农村电网的影响。

农网台区线路异常的自适应DBSCAN-PNN诊断方法

新型电力系统建设背景下,线路异常诊断对于实现农网台区的线损管理和线路健康状态评价意义更为显著。针对当前农网台区缺少数字化线路异常诊断手段的问题,提出了一种基于自适应DBSCAN-PNN的农网台区线路异常诊断方法。首先,获取异常用户的虚拟回路阻抗计算结果;其次,采用K近邻方法自适应选取DBSCAN参数,并结合各类阻抗异常形成的专家先验知识规律,构建典型农网台区线路异常样本数据集;进一步将样本数据集按照一定的比例拆分为训练集和测试集,送入PNN分类模型中进行训练与测试,输出典型异常分类结果。最后,以某地区4类典型异常案例为基础进行案例分析,结果证明该方法异常诊断准确率能够快速实现典型农网台区线路异常诊断的快速精准识别,辅助支撑农网台区线损的精益化运维管理。

配电自动化技术在农村电网中的实践及应用

随着经济发展,居民用电量激增,对供电可靠性、供电质量要求越来越高,传统落后的供电网架无法满足用电需求,配电自动化的研究与应用从变电运行、配网巡查、故障分析等方面全方位的减少配电网管理成本,全面提升农村配电网的管理水平和服务水平,适应新时代农村的用电需求及电网发展。本文通过对某农村电网公司农村电网配电自动化的逐步推进与改造,深入开发研究适合农村电网的配网自动化应用模式及运转模式,解决农村电网由于电网节点多,地理位置复杂,故障诊断麻烦带来的电网运维问题,为公司节省人力物力,提高工作效率,提高供电服务水平。

农网电动汽车充电站及分布式光伏协同规划研究

为推动电动汽车下乡,亟需对县域农网内电动汽车充电设施进行合理规划,并对农网内电动汽车和分布式光伏引起的稳定性问题进行无功优化。首先,结合出行链理论和乡村用户出行习惯,运用蒙特卡洛模拟对需求点电动汽车充电负荷进行预测,并进行光伏不确定性建模。其次,建立了多目标双层规划模型,上层模型考虑经济性,以全社会年总成本最低为目标函数;下层模型考虑安全性,以农网有功网损最低和电压偏移量最小为目标函数。然后,采用了Voronoi图和改进粒子群算法联合求解,充分利用粒子群算法的全局随机寻优能力和Voronoi图的分区域局部寻优特点,达到对模型的精准求解。最后,以某县域规划区进行仿真,仿真结果表明,所提模型能够有效指导农网电动汽车充电站的规划,并且通过无功优化能够显著降低网络损耗、提高电压质量,达到经济性和安全性的双重需求。

信息化背景下乡村电网财务管理问题与振兴建设

随着我国信息化进程的深入推进,乡村电网的建设和管理也开始步入信息化时代,为农村电网建设带来了便利性的同时,也对其财务管理提出了新的挑战。本文首先阐述了当前我国信息化背景下乡村电网的财务管理存在的问题,如信息共享程度低、数据处理效率低、监控难度加大等。基于此,以经济理论为指导,针对以上问题提出了助力乡村电网振兴建设的财务管理策略。本研究结论对乡村电网建设与发展具有积极指导作用,为新时代农村电网的健康发展提供理论支持。

农村电网中电力输配电线路安全运行与维护措施探究

针对农村电网输配电线路安全运行及维护措施进行探究,旨在应对电网老化、自然灾害频发、人为破坏和维护不当等安全挑战。通过对统计数据的深入分析,揭示了农村电网设施的故障率和安全问题。讨论了预防措施,如定期巡检、预测性维护和环境监控的重要性,并强调了在紧急情况下快速响应和应急物资储备的必要性。通过智能传感器和人工智能监测系统的应用,显著提升了电网的稳定性和自动化管理水平。同时,认为提高工作人员和居民的安全意识和操作技能对确保电网安全同样重要。案例研究表明,智能电网技术显著提高了农村电网的供电可靠性,故障率有所下降,但也指出了实施中的经济和人力挑战,以及未来改进的方向。

智能化农村电网建设与优化

随着农村电网的不断发展,智能化技术在其建设与优化中发挥着重要的作用。文章首先分析了智能感知与监控、数据分析与预测以及智能设备与装置在农村电网中的应用,这些技术提升了电网的运行效率和可靠性。其次研究了不同智能化技术整合的难点、数据隐私与安全性等技术问题,投资、成本和政策执行等经济与政策问题。最后通过实例分析智能化农村电网建设的实际效果,强调了智能化配电台区的统一标准和结构规划对系统稳定性和未来发展的影响。

新农村建设中农村电网改造问题研究

农村电网作为重要的基础设施,承担着连接农民用电需求和现代农业发展的重要使命。然而,由于长期的落后设施、技术不足、人力资源短缺等多重因素,我国农村电网在面对快速增长的电力需求和新农村建设的挑战时显得愈发不堪重负。因此,农村电网改造成为当下亟须解决的问题之一。本文旨在深入研究农村电网改造中面临的各种问题和挑战,以期为新农村建设中农村电网的可持续发展和现代化提供有益的参考和建议。

基于云计算的农电网低压电力线载波通信抄表系统设计

文章设计并实现了一种基于云计算的农电网低压电力线载波通信抄表系统。该系统应用最新的载波通信技术和云计算资源,全面覆盖了从抄表系统需求分析、载波通信模块设计,到抄表数据的编码与传输,再到系统界面与交互设计的每一个环节。同时,通过系统化的测试证实该系统具有较好的性能和实用性,为农电网的智能化管理提供有效的技术支持和实现路径。

基于连续聚类算法的农村电网源储优化设计方法

农村电网负荷具有明显的季节性特点,配置光伏等可再生能源发电设备后,系统净负荷波动情况更为复杂,给电网源储设备的最优设计带来了新的挑战。为此提出一种基于连续聚类算法的农村电网源储优化设计方法。该方法可根据系统运行状态调节优化场景中各运行点对应的时间尺度,在有效压缩数据量的同时保真刻画农村电网运行特性。同时,建立了农村电网源储优化设计模型。算例分析表明该方法可有效提高农村电网源储优化设计的准确性。