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.

Rural Power System Load Forecast Based on Principal Component Analysis

Power load forecasting accuracy related to the development of the power system. There were so many factors influencing the power load, but their effects were not the same and what factors played a leading role could not be determined empirically. Based on the analysis of the principal component, the paper forecasted the demands of power load with the method of the multivariate linear regression model prediction. Took the rural power grid load for example, the paper analyzed the impacts of different factors on power load, selected the forecast methods which were appropriate for using in this area, forecasted its 2014-2018 electricity load, and provided a reliable basis for grid planning.

Application of Interval Algorithm in Rural Power Network Planning

Rural power network planning is a complicated nonlinear optimized combination problem which based on load forecasting results, and its actual load is affected by many uncertain factors, which influenced optimization results of rural power network planning. To solve the problems, the interval algorithm was used to modify the initial search method of uncertainty load mathematics model in rural network planning. Meanwhile, the genetic/tabu search combination algorithm was adopted to optimize the initialized network. The sample analysis results showed that compared with the certainty planning, the improved method was suitable for urban medium-voltage distribution network planning with consideration of uncertainty load and the planning results conformed to the reality.

Research of Rural Power Network Reactive Power Optimization Based on Improved ACOA

In view of the serious reactive power loss in the rural network, improved ant colony optimization algorithm （ACOA） was used to optimize the reactive power compensation for the rural distribution system. In this study, the traditional ACOA was improved in two aspects： one was the local search strategy, and the other was pheromone mutation and re-initialization strategies. The reactive power optimization for a county＇s distribution network showed that the improved ACOA was practicable.

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.

Simulation Study on Series Capacitor Compensation to Improve the Voltage Quality of Rural Power Distribution Network

In order to improve the voltage quality of rural power distribution network, the series capacitor in distribution lines is proposed. The principle of series capacitor compensation technology to improve the quality of rural power distribution lines voltage is analyzed. The real rural power distribution network simulation model is established by Power System Power System Analysis Software Package (PSASP). Simulation analysis the effect of series capacitor compensation technology to improve the voltage quality of rural power distribution network, The simulation results show that the series capacitor compensation can effectively improve the voltage quality and reduce network losses and improve the transmission capacity of rural power distribution network.

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.

Micro Hydro Power Plant for Sustainable Energy in Rural Electrification: A Case Study in Cameroon

The state of Cameroon, faced with the situation the electricity deficits, is promoting the development of renewable energies in general and to meet rural electrification needs in particular. The purpose of this work is to study the feasibility of the MHP of Batcheu, to show its contribution to sustainable development in this locality and to prove that it is a profitable project. After study, it appears that the waterfall of Batcheu is favourable to the establishment of a MHP with an installed power of 260 kW with an operating diagram corresponding to a Francis turbine. Given that it is a renewable energy that can supply more than 800 households in rural areas, its contribution to sustainable development is obvious. Its investment cost is estimated at 171,465,396 FCFA. It is a profitable project with a payback time of 7 years and 2 months.

土地出让收入支持乡村振兴动力来源及机理分析

为更好支持乡村振兴战略实施,从马克思地租理论出发阐释土地出让收入的双重属性和本质内涵,描述激励约束机制下土地出让收入用于农业农村发展的情况。结合《乡村振兴战略规划(2018—2022)》和《关于调整完善土地出让收入使用范围优先支持乡村振兴的意见》说明土地出让收入支持乡村振兴的应然领域。采用规范分析法,选取2010—2019年国有土地出让面积、土地出让收入和用于农业农村的支出的相关数据,分析土地出让收入对乡村发展的影响。土地出让收入用于农业农村发展的支出在总额上逐年增加,但相较于城市支出比例偏低,且存在收益分配不均的问题。通过对土地出让收入的制度属性的分析,发现分税财政体制、政绩考核制度和低土地财政依赖度三方面是土地出让收入支持乡村振兴的外生动力,为可持续内生动力的产生创造外部环境;土地出让收入的合理分配格局、精准投入、政策引导人才流向乡村三方面是内生动力。厘清土地出让收入支持乡村振兴内在和外生动力来源及其机理,有助于形成土地出让收入合理分配格局,减少对土地财政的依赖度,缩小城乡发展差异。

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。

基于多模态神经网络流量特征的网络应用层DDoS攻击检测方法

农业设备、传感器和监控系统与网络的连接日益紧密,给农村配电网带来了新的网络安全挑战。其中,分布式拒绝服务(DDoS)攻击是一种常见的网络威胁,对农村配电网的安全性构成了严重威胁。针对农村配电网的特殊需求,提出一种基于多模态神经网络流量特征的网络应用层DDoS攻击检测方法。通过制定网络应用层流量数据包捕获流程并构建多模态神经网络模型,成功提取并分析了网络应用层DDoS攻击流量的特征。在加载DDoS攻击背景下的异常流量特征后,计算相关系数并设计相应的DDoS攻击检测规则,以实现对DDoS攻击的有效检测。经试验分析,所提出的方法在提取DDoS攻击相关特征上表现出色,最大提取完整度可达95%,效果明显优于对比试验中基于EEMD-LSTM的检测方法和基于条件熵与决策树的检测方法。

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。

资本嵌入与文化共生的乡村振兴动力机制——以江西省S村为例

基于嵌入视角,构建“资本嵌入-文化整合”分析框架,审视乡村振兴过程中江西省S村从脱贫攻坚到乡村振兴的实践历程,以揭示资本嵌入与文化内生的乡村振兴双轮驱动机制。结果表明:乡村社会网络中存在“政策托力-产业助力-文化赋力-全面聚力”的乡村振兴逻辑,以党建引领多元资本嵌入乡村网络,整合外部与内部资源推动利益增值转化;资本嵌入弥合乡土文化断层,促进乡村振兴动力的内生发展,且在多级政府主导的公共制度资本下,形成乡村社会网络的有机结构。据此,建议从培育乡村多元资本、转化乡村本土资源、增强乡村本土文化建设等方面推动我国中西部地区农村的乡村振兴进程。

乡村振兴战略下农村承包地“三权分置”问题研究

作为我国实现农业现代化建设和乡村振兴的必由之路,农村承包地“三权分置”制度在乡村振兴战略实施中的探索与实行必将得到进一步深化。农村承包地“三权分置”的制度设计是为了增强农业的规模化经营、提高农业生产力以及保障农民收入等。在乡村振兴战略下实行农村承包地“三权分置”具有必要性,通过对乡村振兴和“三权分置”的政策进行梳理,并结合相关研究与农村实地调查,总结农村承包地“三权分置”的成效,针对“三权分置”中承包地土地经营权的性质尚不明确、集体所有权虚置、土地流转“非农化”“非粮化”现象等问题,提出相应的对策建议,为解决农村承包地“三权分置”中存在的问题提供思路,从而推动乡村振兴。

论服务教育强国的农村教育治理

实现农村教育“善治”,确保城乡教育资源供给均衡,是推进教育强国建设的重要基础。当前,农村教育治理依然存在诸多阻滞因素,主要体现在治理主体的功利主义动机与模仿套用倾向,治理方式囿于传统导致非专业化现象频发,治理机制虚化导致深度性融合与落实不力,治理要素结构功能失调。促进农村教育治理服务教育强国国家战略,在价值逻辑层面,既要实现规范化与在地化的统一,又要保证工具效用与价值理性的融合,重视乡土文化自信养成;在具体实践层面,则须构建结构优化与多元共享的投入机制,并遵循比较优势与双重一体化的治理进路,不断完善强国与为农并重的教育信息化治理架构。

乡村振兴战略下中国式畜牧强国建设的路径探析

畜牧业是农业农村发展的支柱产业之一,对保障食品安全有重要影响。乡村振兴战略的推进下,中国式畜牧强国建设已取得一定成效,我国畜牧业转型升级步伐加快,产能持续提升,质量效益和竞争能力持续提高;畜牧产业规模的不断壮大极大地带动了农村发展和农民增收;科技支撑加强,绿色发展进程全面推进,中国式畜牧强国建设取得明显成就。因此,中国式畜牧强国建设需践行绿色发展理念,适应高质量发展要求的具体体现,推进共同富裕的关键路径与核心任务。畜牧业发展需补齐行业短板,全面提升发展质量,坚持扩大内需,有效带动农业农村经济加速增长。应深化科技改革,为畜牧行业绿色转型升级赋能,为驱动中国式畜牧强国建设提供有益参考。