Making the World More Sustainable: Enabling Localized Energy Generation and Distribution on Decentralized Smart Grid Systems

Smart grid is an idea of upgradation of the traditional electric grid infrastructure. The efficiency of the existing electrical grid can be automated by integrating with innovative technical equipment such as:?high-tech forecasting system, digital sensors, advanced two-way communication and two-way power flow systems. Smart grid establishes an interface between utility and consumer which helps to use energy, based on the preferences of price, eco-friendly and without technical system issues. It empowers the grid to be more secure, reliable and efficient. The peer-reviewed articles and published government reports have been reviewed, based on the analysis of technical characteristics of power generation systems, eco-friendly sources of power generations, cost reduction, functionality and design of traditional grid versus smart grid. Furthermore, the innovative technologies that enable the grid to integrate with decentralized power generation system efficiently have been considered. This paper claims that in this modern era, it is arduous for traditional grid to fulfill the rising demand of electricity, along with sustainable, eco-friendly and stable power supply, as it cannot be efficiently integrated with decentralized and localized power generation systems and renewable energy sources. The result of this paper shows that decentralized and localized power generation systems are located close to end-users which decrease the transmission and supply cost of electricity. Innovative technologies allow the decentralized and localized power generation systems to be integrated with renewable energy sources which help to reduce the cost of utility services and provide clean energy. Moreover, technological advancement played a decisive role in enabling the electrical system to be more efficient. Electrical reliability can be improved,?greenhouse gas emissions can be reduced, renewable energy sources can efficiently be integrated,?and?rising demand for electricity can be met by embedding advanced applications and technological equipment in the electrical grid.

The Research about the Trans-provincial Centralized Bidding Trading Market of East China Power Grid --I:Empirical Analysis

The clearing price and bidding price in electricity market are two key indicators to measure whether it is reasonable or not. Based on the grey incidence analysis, this paper studies the correlation coefficient between the clearing price and bidding price with the generation cost, the supervision and rules of the market, the supply and demand situation, the behavior of market members over the same period, which is based on the actual data of the trans-provincial centralized trading market of East China Power Grid. The results show that the factors affecting the clearing price and bidding price from largest to smallest are generation cost, supervision and rules of the market, the supply and demand situation, the behavior of market members. The conclusion is that the trans-provincial trading platform of East China Power Grid is a reasonable regional market which can discover the market cost, and regulate the market supply and demand balance, and promote healthy competition.

The Research about the Trans-provincial Centralized Bidding Trading Market of East China Power Grid --II:Model Analysis

In this paper a novel cost function based on the relationship between operation cost of unit and generation load rate is employed in an agent-based model of Trans-provincial Centralized Bidding Trading Market of East China Grid. Simulation results are compared to real data to prove that the model is correct. Further analysis on simulation results point out the way to achieve an all-win game for power market members: generation companies improve their average load rates of the units by selling their electricity in the market, which makes units' cost drop and settlement price stay lower than benchmark price. Consequently electricity-demand provinces saved expenses, and units increase their profits. In conclusion, the trans-provincial electricity market of East China Power Grid is a successive case which improves the efficiency of the electricity industry by market-oriented measures.

基于CGCS2000的相对独立平面坐标系建立和分析

随着2000国家大地坐标系的全面启用,原有地方坐标系已无法满足现代城市建设和社会发展的需要。论文阐述了地方坐标系建立原则和方法,结合投影变形理论对相对独立平面坐标系建立影响因素中中央子午线和投影面的选取进行了详细分析,并以淮安区域为例,结合淮安DEM,详细分析了淮安2000坐标系在淮安市各区县的投影变形情况,同时用格网占比法分析了其与原有坐标系的面积变化。结果表明,淮安2000坐标系在淮安区域内小于2.5 cm/km面积占淮安陆域面积的99.8%,最大投影变形为3.303 cm/km,位于丘陵区域;与原有坐标系相比,在面积变化上优于万分之一,具有良好的适用性。

大规模构网型储能集中接入对短路电流的影响分析

随着技术性能提升和成本降低,构网型储能集中并网规模不断扩大,其对系统短路电流的影响不容忽视。基于构网型储能的机电暂态仿真模型,分析不同限幅策略下设备的短路电流幅相特性,并通过算例仿真不同储能接入规模、过流能力、并网电压等级及运行工况下近区母线短路电流的变化情况,从多个角度揭示储能并网对近区母线短路电流的影响规律,量化构网型储能对并网母线短路电流的贡献幅值,并针对考虑短路电流提升效果的构网型储能容量配置及布点提出相关建议。

调度操作命令票集中展示智能平台的设计与应用

针对调度员在填写、审核、执行调度操作命令票时需要来回切换操作界面、难以把握调度操作命令票进度状态等问题以及伴随可能引发的票单填写不规范、操作延时、恶性电气误操作等安全风险,提出了建设调度操作命令票集中展示智能平台。该平台基于配电网运行管理技术支持平台的微服务架构技术,采用缩略图形式将同一时间维度的调度操作命令票进行集中轮播,构建调度操作命令票运行状态与调度操作关联逻辑策略智能预警调度操作节点,融合多源异构数据实现调度操作命令票的快速填写和审核。目前研究成果已在某地市供电局配网调度班组投入使用,经过测试验证,该智能平台能够明显缩短调度操作命令票的操作时长、调度操作智能提醒功能正确率达到100%,可以有效提升工作效率。

应急电源车用多模式高压发电机组的设计

为了解决过去电网应对突发电力事件时,通常采用单一的发电作业形式保障供电,导致10kV配电线路由于计划性检修、自然灾害或突发事件等原因造成电网停电时,严重影响生产、生活秩序和社会经济发展;设计了多模式电网专用高压应急电源车。结果表明:该应急电源车具备一次并网、二次并网功能,实现计划性不停电检修;采用并机模块和并网模块模组合控制技术,可实现应急电源车多模式工况的运行;采用模块CAN2自动交涉技术,实现模块CAN2通讯地址的自动切换,保证CAN2通讯地址不冲突。同时,该应急电源车采用触摸屏集中监控技术,可控制机组的启动和停机以及机组断路器和市电开关的合闸和分闸,极大地提升了用户使用的便捷性。

A novel decomposition and coordination algorithm for complex networks and its application to power grids

To analyze and control complex networks effectively, this paper puts forward a new kind of scheme, which takes control separately in each area and can achieve the network’s coordinated optimality. The proposed algorithm is made up of two parts: the first part decomposes the network into several independent areas based on community structure and decouples the information flow and control power among areas; the second part selects the center nodes from each area with the help of the control centrality index. As long as the status of center nodes is kept on a satisfactory level in each area, the whole system is under effective control. Finally, the algorithm is applied to power grids, and the simulations prove its effectiveness.

基于隐马尔科夫模型的电费抄核误差校正系统

为提升电价审核工作效率、明确细小用电误差,提出基于隐马尔科夫模型的电费抄核误差校正系统。系统通过MAX1480B通信接口芯片与上级主站、下级各费率装置间通信联络,以地址逻辑译码GAL16V8B和电路MAX706R,解决攻击发生时系统复位问题;主程序模块利用隐马尔科夫模型,描述状态与观测数据间随机过程和马尔科夫链,将隐性误差随机数据发送到校正模块,计算平均功率,得出相应失压断相时追补电量;使用通信模块的串行口发送校正服务,完成抄核误差校正。实验证明系统校正精度较高,且响应时间短。

Study of Micro Grid Safety &Protection Strategies with Control System Infrastructures

Microgrids have been proposed in order to improve reliability and stability of electrical system and to ensure power quality of grid. Microgrid consists of low voltage distribution systems with distributed energy resources, such as wind turbine and photovoltaic power systems, together with storage devices. It is essential to protect a micro grid in both the grid-connected and the islanded mode of operation against all different types of faults. This paper describes micro grid protection and safety concept with central control and monitoring unit where multifunctional intelligent digital relay could be used. This central control & monitoring infrastructure is used for adaptive relay settings strategy for micro grid protection. Also operational safety design concept and fault mitigation technique is proposed to ensure confidence in protection system.

大型集中式光伏发电站的电压稳定性与调节策略

随着可再生能源的快速发展,大型集中式光伏发电站在全球范围内得到了广泛应用。然而,由于光伏发电的间歇性和波动性,其接入电网后可能会引发电压稳定性问题。本研究聚焦于解决大型集中式光伏发电站接入电网后可能出现的电压波动和稳定性问题。通过深入分析光伏发电的间歇性特点、系统阻抗特性以及光伏逆变器的控制策略等因素,提出了一系列针对性的优化策略,包括升级调节设备以提高响应速度和调节精度,优化调节策略与算法以更好地应对电网的动态变化,以及展望未来技术发展趋势,如智能化技术和基于大数据的电压控制方法,以期提高光伏发电系统的稳定性和可靠性,推动可再生能源在电力系统中的更广泛应用。

分体式钢箱梁竖向涡振检修轨道气动措施风洞试验研究

双分体式钢箱梁具有良好的颤振性能,但在常遇风速内易发生涡激振动。为研究双分体式钢箱梁的涡激振动性能及其抑振措施,以某跨径为658m的双分体式钢箱梁斜拉桥为背景,通过节段模型风洞试验,开展检修轨道与中央格栅等一系列独立气动措施以及多种联合气动措施对主梁涡振性能的优化研究。试验结果表明:1)在常遇风速下,原始断面在5个来流攻角(α=0°,±3°,±5°)中均观测到大幅竖向涡激振动,需采取抑振措施来抑制主梁涡激振动,结构阻尼提升至1.48%时涡振振幅仍未满足限值要求,完全消除主梁涡激振动需将阻尼比提升至2.3%;2)优化检修轨道位置能有限减小主梁竖向涡激振动,减少幅度在12.8%~29.6%之间;3)在分体式双箱梁中央开槽处添加中央格栅能大幅减小主梁竖向涡振振幅,相较原始断面减少了60%以上;4)检修轨道与中央格栅联合减振效果不如独立添加中央格栅气动措施,但这2种气动措施联合稳定板能有效控制主梁涡激振动,且相较原始断面,主梁涡振振幅下降了78%以上,在此基础上对中央开槽的封堵率以及检修轨道与外侧斜腹板之间的间距进行优化,最终得到一种双分体式钢箱梁断面涡激振动抑振措施,使主梁竖向涡振振幅减少了96.9%。研究成果可为双分体式钢箱梁涡激振动抑制气动措施方案提供参考。

Trends and Overview Regarding the Involvement of Micro-Grids in Modern Power Systems

Customer satisfaction and participation in utility supply packages is the first and foremost factor in the success of any supplying agency whether wholesale or retail dealer. The paper presents the concept of major prospects of non- autonomous micro-grids installed in a certain locality. The article shows the basic background that is required for the installment of micro grid in a particular area and discusses the primary factors or pre-requisites that are required for the existence and operation of micro-grids. It elaborate the major profitable applications and benefits that developing and developed states get by using micro-grids in an area where utility grid is already functioning .It also explains the basic improvement in the quality of supply from micro grid after its installment. It also throws light on afterwards impact on society with this system, such impacts include reliability, tariff rates, economics etc. The article discusses micro-grids as the future of modern power systems. This paper shows significance of modernization by latest topologies in power systems and its effect that will come afterwards.

从地方回应、中央推广到自发学习:政府治理创新的过程演变与结构约束——基于网格化管理的纵向案例研究

打开“过程黑箱”是地方政府创新研究的核心议题之一。地方治理创新通常会经历地方回应发起、中央推广扩散和地方自发学习三个阶段。社会嵌入、政治支持和文化规范是影响地方政府创新过程的关键机制,社会嵌入为地方政府创新提供了契机和动力,政治支持促进了创新项目的延续扩展和纵向扩散,而文化规范则推动了创新项目的政策学习与自发扩散。地方回应型创新跃升为国家政策的过程,既是社会嵌入机制逐步减弱、政治支持和文化规范机制逐步增强的过程,也是反复进行的“地方化”和“国家化”过程。

Feasibility Study of Smart Grid in Bangladesh

The agenda of this paper is to discuss about the significance and a detailed feasibility study of practical implementation of Smart Grid in Bangladesh. Smart grid refers to an electric power system that enhances grid reliability and efficiency by automatically responding to system disturbances. Power crisis is a major problem for a developing country like Bangladesh. Efficient transmission and distribution of electricity with essential energy resources is a fundamental requirement to provide citizens and economies. The paper analyzes the characteristics of Smart Grid and a comparative analysis with conventional grid system. It also discusses about the efficient transmission and distribution process which will integrate power system with renewable energy and information system.

刮板输送机中部槽结构设计优化

通过对某矿SGZ1000/3×1000型刮板输送机中部槽结构特点进行分析,并利用仿真模拟软件对中部槽的静力学特征进行仿真模拟计算,通过计算结果可以看出,在中部槽铲板槽帮位置应力集中现象严重,最大应力值达到580 MPa。在对这一部分进行结构焊接优化并进行铲板槽帮加厚处理之后,应力集中现象得到有效缓解,中部槽结构运行稳定性得到显著增强。

电气自动化在集中式并网光伏电站中的应用及发展

文章简要分析了如何在集中并网光伏电站中更好地应用电气自动化技术,旨在帮助开展这项工作,同时为从整体上提高我国太阳能发电系统的质量奠定更坚实的技术基础。

区域源网荷储一体化调控管理模式

针对当前面临的“新能源+规模化储能”调控策略缺失,主动支撑能力不足以及多系统林立等共性问题,本文以全国首个“源网荷储”一体化项目为例,探讨一体化调控管理模式的应用。主要研究内容包括区域风光功率联合预测,电网友好型新能源电站的“网-源”协调关键机制,风光储场站协同优化控制保护,新能源快速一次调频和虚拟惯量支撑等技术创新研发,以及风光储场站一体化数据集控平台研发和“集控+直控”双调度模式创新。研究结果表明,一体化集控平台从可测、可控、可调、可支撑四个方面为源网荷储一体化运行提供数据支持,满足新能源电站一体化接入及风光储稳定运行的要求,实现了全景智慧、电网友好、风光储协同的目标。研究成果有助于加快推动源网荷储一体化建设,并为规范化的源网荷储一体化实施路径提供参考。

农村电网集抄运维系统构建与应用

由于农村地区缺乏可靠、完善的建筑物及线路地理位置等信息,电力设备信息管理和维护依赖人工操作,难以快速定位故障地理位置及修复故障,因此提出一种农村电网集抄运维系统构建方案,用于解决农村电网数据信息管理困难的问题。首先,针对数据采集人员和维修作业人员的工作需求,构建农村电网集抄运维系统的客户端和服务端结构;然后,分析适用于农村电网结构的迪克斯特拉(Dijkstra)算法和最短路径快速算法(SPFA)两种最短路径计算方法;最后,根据农村电网结构特征对两种算法的计算性能进行对比分析,结果表明采用Dijkstra算法较SPFA更适用于农村电网最短路径规划,所设计的系统能够有效解决农村电网运行维护困难的问题。

集控站监控系统智能化辅助决策技术分析

集控站负责所辖区域内所有变电站监控信息的监测和告警分析判断,当电网发生事故时,可以第一时间响应并向调度人员进行汇报,对于保证电网的安全稳定运行发挥着重要作用.在当前的集控站监控系统运行中,存在人工工作量较大、智能化程度相对不足等问题.通过详细分析集控站监控系统智能化辅助决策技术的应用,从而有效降低集控站工作人员的工作量,提高电网运行管理的智能化技术水平,更好地保障电网的安全稳定运行.