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.

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.

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.

Construction and Retrofit of Rural Power Networks in West China

This paper describes briefly the results of construction and retrofit of rural power networks in West China's 12 provinces (regions). A large number of power lines and sub stations were newly built and updated. The rate of power penetration of townships, villages and peasant households was grown significantly. The rate of line loss dropped great ly. Power-supply reliability was improved clearly. The 'same network, same price' of urban and rural residential con sumption was brought about, and sales price to peasant households lowered substantially.

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.

考虑电转氨和生物质废能转换的农村化工综合能源系统低碳调度方法

农村地区能源绿色转型发展是构建现代能源体系的重要组成部分,而引入化工类产业在促进乡村振兴的同时,也带来严重的污染问题。因此,研究农村化工生产脱碳及园区能源结构优化对实现“双碳”目标和农村现代化具有重要意义。该文提出一种考虑电转氨和生物质废能转换的农村化工园区综合能源系统低碳调度方法,通过利用富余可再生资源产生绿氨,考虑碳-氨耦合过程,将绿氨与碳捕集设备联合运行促进化工生产,同时利用生物质能替代燃煤发电,三者构建化工园区联合生产单元,进而降低园区碳排放及运行成本。首先,建立电转氨两阶段模型和生物质废能转换模型及其能流关系。其次,构建化工园区联合生产单元,分析其电、热、气以及碳能量耦合特性。再次,引入有机朗肯循环(organic Rankine cycle,ORC)余热发电和负荷侧综合需求响应,综合优化化工园区联合生产单元。最后,以化工园区运行总成本最低为目标,通过不同场景对比分析证明所提调度方法对化工园区有较好的改善作用,可为农村产业结构调整和能源转型提供理论支持。

新型农村配电网数字化、智能化改造分析

为了实现农村高质量建设和高效有序运行,同时改善人民的居住环境,这些需求让农村电力配网需求不断涌现。据农村的规模、户数和用电设备情况,进行详细的电力需求计算。考虑到基本用电负荷、公共设施(如电梯、照明、消防系统等)的电力需求,以及可能存在的高峰用电情况,确保供电系统能够满足整个楼宇的电力需求。该供配电系统工程设计以某新型农村建筑作为研究对象,进行电气系统方案设计,主要设计3个子系统,分别是农村建筑的供配电系统、照明系统和火灾自动报警系统。对于供配电系统的设计,首先分析负荷计算的常用方法,分析鉴定该农村区域的负荷级别,计算所需设备容量。接着依凭经测算得到的设备容量数据,选择导线和电缆的规格以及变压器的容量。凭据负荷的性质,选择供电主接线模式和配电模式。对于火灾自动报警的设计,确定消防的防护级别,选择适合的火灾探测器和联合控制消防形式,绘制火灾自动报警平面图和系统图,其中讨论火情探测报警系统和联合控制消防系统这2个系统。

数字化技术在农村供电可靠性中的应用

阐述农村供电可靠性存在的问题及原因,探讨数字化电网在解决这些问题中的作用,包括实时监测与故障诊断、远程控制与自动化操作、预测与优化调度,以及智能微电网与分布式能源接入。

新型电力系统下的农村电网特征与规划关键技术

分析新时代背景下的现代化农村电网内在支撑逻辑关系,在此基础上开展了现代化农村电网的特征和建设形式,提出为实现现代化农村电网需要的关键技术,以提升农村供电质量和农村电网智能化、数字化水平,支撑数字乡村建设,提升电网承载力和灵活性,保障农村基础设施的建设,服务国家战略任务和目标的实现。

乡村文化振兴的动力、运行与优化:一个系统性的分析

乡村文化振兴是乡村振兴的重要内容和有力支撑。基于系统动力学的分析,乡村文化振兴动力系统包含基础动力、内生动力、外生动力和支撑动力等动力要件,是由物质、历史、理论、文化、人才、社会、领导和规制等要素有机构成。乡村文化振兴动力系统的运行逻辑呈现“党和政府—社会组织—人民群众”协同合作模式,强调乡村文化振兴的多元主体参与,以增加整体力量来促进乡村文化振兴;在模型上搭建“输入—输出—反馈”为主体架构的运行回路,完成对乡村文化振兴动力的要素解构与运行建构,为乡村文化振兴提供深化拓展的方向。

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。

村级组织负责人“一肩挑”后权力监督体系的实践与探索——以浙北K区为例

“一肩挑”后基层乡村权力监督体系并没有随着权力高度集中而有所重构,而是继续沿用村“两委”书记、主任分设的“过时”监督格局。基层现行监督体系由于缺乏内部有效监督,以及受“熟人社会”、“搭便车”、村庄派系和“支持-庇护”等因素制约,加之,外部监督力量不足,存在低效(失效)现象。对此,应通过搭建以上级监督、专责监督、内部监督和社会监督等为着力点的多元共监格局,立足于畅通的进退机制、有效的村级监督、明晰的责权边界、快速的问责回应和扎实的上级监督等,塑造更加风清气正的乡村政治生态,为基层治理现代化提供可靠的政治保障。

农村配电系统中的智能无功补偿系统分析

阐述配电系统中的低压无功补偿现状,探讨无功补偿技术的应用,包括综合配电监测技术性能分析、智能低压无功补偿技术投切开关、电能质量以及在线谐波监测分析、智能无功补偿控制器的采用。

农村电网低压直流配电系统研究

现如今,正值能源变革,农村经济快速发展,乡村配电网电能供求矛盾突出,但是乡村又蕴藏着大量太阳能光伏能源和其他分布式清洁能源。如何能够高效地利用这些能源,改善农村电能紧张局面,需要根据需求进行研究。由于分布式能源大多带有直流属性,因此可采用低压直流配电系统建设新能源。采用电力电子自适应控制技术并结合实际需求合理设计蓄电容量,仔细研究直流配电系统的网络拓扑和工作流程,对实际系统运行中出现的实际问题从标准、性价比及负荷等方面提出相应对策。文章分析了低压直流电网应用与农村的特性,并提出了一种农村低压直流配电系统整体方案。

游戏力视角下农村留守儿童情感支持系统建构研究

为有效满足农村留守儿童的情感需求,构建基于游戏力理论的情感支持系统。采用问卷调查与分析的方法在分析现有情感支持系统不足的基础上借助需求调研、活动设计、试点实施等构建全面的支持系统。结果表明,农村留守儿童的情感需求强烈,对情感支持系统的效果评价较高,整体反馈积极,该系统能够有效提升留守儿童的情感表达能力和心理健康水平。根据收集到的建议对该系统进行调整,通过加强家庭互动、增设心理咨询服务及丰富互动游戏内容对系统进行改进,从而进一步优化情感支持系统,促进留守儿童的全面发展。

碳管理体系助力宁夏地区电网能源规划和城乡建设——基于国网宁夏电力的研究

我国“双碳”目标的确立对能源规划和清洁能源使用提出新要求,对电力行业而言,既是机遇,也是挑战。电网作为电力系统的枢纽,需要制定合理的碳管理策略,促进电力市场健康、有序发展,助力国家和地方低碳社会建设。文章在总结宁夏地区供能端、输送端和需求端能源规划现状的基础上,有针对性地提出优化策略;并以国网宁夏电力有限公司为例,进一步探索电网企业碳管理体系支撑下高效的低碳发展路径,从电网企业、能源规划及城乡建设三个维度提供可借鉴的经验。研究结果有利于推动电网行业的能源规划优化,助力城乡建设,推进国家和地方碳普惠建设,有效改善人居环境,为可持续绿色城市规划和乡村振兴提供新路径。

农业强国背景下打造新时代数字“三农”服务体系的探索与实践——以衢州市为例

衢州市是“农技110”为农服务体系的发源地。进入新时代,尤其在浙江省数字化改革大潮下,如何打造新时代数字“三农”服务体系助力农业强国建设,成为当前需深入思考和谋划的重大课题。文章分析了衢州市打造新时代数字“三农”服务体系的路径探索和取得成效,阐明了当前面临问题挑战,并提出下一步工作方向。