基于AHP-TOPSIS算法的重要电力客户用电状态评估

在新型电力系统构建过程中,电力客户用电状态识别与评估将成为其参与需求响应、虚拟电厂等新兴业务的重要基础。以保障重要电力客户安全用电为出发点,挖掘应用电力大数据,提出了一种基于层次分析法(analytic hierarchy process,AHP)-优劣解距离法(technique for order preference by similarity to an ideal solution,TOPSIS)的重要电力客户用电状态评估方法。首先搭建了基于Hadoop架构的用电大数据分析平台,为大数据分析提供高性能平台支撑。然后从电压、负荷和综合三类维度构建了9项评估指标,用以描述重要电力客户的用电状态。最后采用AHP-TOPSIS算法分别对电压类、负荷类、综合类指标进行分项评估分析,得出了三类指标各自的用电状态评估值,再通过变权重加权求和的方式确定重要电力客户的用电状态评分。经过算例分析和现场验证,证明了模型和算法的合理性、可行性,该方法有助于促进客户故障事后抢修向事前预警转变,具有保障安全用电、支撑精准巡视、服务主动抢修的多重功效。

基于神经网络的工厂用电状态识别方法

智能电表的迅速普及与应用引起电力消耗数据(即智能电网数据)的激增,这不仅给数据的存储与通信带来了挑战,同时也增加了对数据进行分析的难度。另外,由于生产性质和经营方式的不同,工厂的用电状态往往比较复杂。基于传统经验的人工识别不能满足实际应用的需求,该文研究了一种基于神经网络的工厂用电状态自动识别方法。首先,对采集于真实应用场景的电网大数据进行必要的预处理,包括数据的合并、清洗、标准化、打标和抽样;然后,基于预处理的电网数据构建神经网络模型用于对工厂用电状态的自动识别;最后,对提出的基于神经网络的工厂用电状态识别方法进行实验验证,证实了该方法的合理性和有效性。通过对工厂用电状态的准确识别,能够帮助供电公司指导企业进行错峰用电,进而有效缓解电力供给不平衡的问题,以达到对电能合理开发和利用的目的。

基于用电大数据的用电异常状态辨识方法

为充分利用并挖掘电力系统中海量的用电数据进行用电异常状态的识别,本文基于计量自动化系统智能电能表所采集的用电大数据,用随机矩阵理论对用电异常状态、异常时间段及异常地点的辨识进行研究。首先,介绍了用电大数据构造高维随机矩阵的方法,并分析了高维随机矩阵的协方差矩阵特征谱分布规律;然后,根据矩阵的特征值统计特性变化规律提出基于用电大数据矩阵的用电异常状态辨识及定位方法;最后,以贵州各大行业实际用电数据为例,对不同的行业进行了仿真验证,仿真结果表明该方法能准确识别用电异常并判别异常时间段和异常地点,不仅能满足电网对可视性、时效性、可靠性和安全性的迫切要求,而且为数据驱动用电环节智能化、可视化监控提供了新思路。

基于物联网技术的智能厂房控制系统设计

随着物联网技术的快速发展,许多大型生产企业通过采用该项技术实现了工厂设备与场景的远程监控,最终实现了企业的智能化管理。但是目前许多中小型企业因为资金和技术方面等问题没有安装合适的物联网监控系统,导致企业在生产过程中存在诸多问题,集中表现为断电产生的生产问题和因电或火灾等事故引发的人身安全问题。针对上述问题提出了一种基于物联网技术的智能厂房控制系统方案,该方案采用HC2000控制器作为主控制器,不仅可以远程实时监测厂房的温湿度和用电状态,还可以进行远程定时断电以及温湿度、断电报警等,既能够保障厂房的正常生产,也能够保证员工的人身安全。除此之外,按照企业计划通过添加定时断电功能还能为企业节省电费开支,减少夜间事故的发生,对中小企业的发展具有巨大的促进作用。

基于单片机的智能插座设计

近些年来,智能家居新产品层出不穷,智能插座就是其中一种。传统家电大部分没有智能化和信息化功能,智能插座就起到了辅助传统家电的作用,包括供电远程控制,用电状态监测与控制等功能。本文提出一种低成本、高效率的智能插座设计方案。

非侵入式负荷分解文献综述

基于非侵入式负荷分解是通过对总负载端的特征变化来识别各负荷的用电状态,阐述非侵入式负荷分解的数据集,特征及方法。非侵入式负荷分解与侵入式负荷分解最大的不同在于不需要在用户侧安装大量的监测设备,即可达到对用户用电信息的收集。

Effect of electrochemical state on corrosion-wear behaviors of TC4 alloy in artificial seawater

The electrochemical and corrosion?wear behaviors of TC4 alloy in artificial seawater were studied. And the influences of electrochemical state on passive behavior, failure mechanism of passive film and corrosion?wear synergy were emphatically analyzed. The corrosion?wear analysis of the alloy was fulfilled by methods of mass loss, electrochemical testing and scanning electron microscope (SEM). It can be observed that the cathodic shift of open circuit potential and three order of magnitude increase of current density can be obtained during corrosion?wear process. Total corrosion?wear loss increases with increasing applied potential, confirming the synergy between wear and corrosion. High polarisation potential results in low coefficient of friction and high corrosion rate. The relative contribution of pure mechanical wear to total material loss deceases obviously with the increase of potential from open circuit potential to 0.9 V during corrosion?wear. Contributions of wear-induced-corrosion and corrosion-induced-wear are significant especially at higher potentials.

Mapped Finite Element Discrete Variable Representation

Efficient numerical solver for the SchrSdinger equation is very important in physics and chemistry. The finite element discrete variable representation （FE-DVR） was first proposed by Rescigno and Mc-Curdy [Phys. Rev. A 62, 032706 （2000）] for solving quantum-mechanical scattering problems. In this work, an FE-DVR method in a mapped coordinate was proposed to improve the efficiency of the original FE-DVR method. For numerical demonstration, the proposed approach is applied for solving the electronic eigenfunctions and eigenvalues of the hydrogen atom and vibrational states of the electronic state 3E＋ of the Cs2 molecule which has long-range interaction potential. The numerical results indicate that the numerical efficiency of the original FE-DVR has been improved much using our proposed mapped coordinate scheme.

Research and Application of Safety Information and Control System of Nuclear Power Station

The thesis researches the safety infonnation and control system （SICS） design principle and introduces engineering application in CPR1000 nuclear power station in China. The SICS provides sufficient control and monitoring means to bring and maintain the plant in a safe state as a backup of main computerized control mean （MCM）, in any plant conditions that are probable during a planed or unplanned unavailability of the MCM. The successful engineering applications of SICS in different digital I＆C system platform are introduced in the paper. The thesis gives the research conclusion for new general SICS of digital I＆C system.

Comparison of luminescent properties of helicene-like bibenzothiophenes with o-carborane and 5,6-dicarba-nidodecaborane

This article describes comparison of the anchoring effect on electronic properties of the helicene-like bibenzothiophene between o-carborane and 5,6-dicarba-nido-decaborane. The o-carborane and nido-decaborane-fused bibenzothiophenes were simultaneously obtained in the same reaction and successfully isolated. Initially, the X-ray single crystal analysis revealed that the helicene-like distorted structure was realized in the nido-decaborane-fused bibenzothiophene. From optical measurements in the solution state, distinct different characteristics depending on the type of anchors were observed. It was summarized that the absorption and luminescent properties originated from weak π-conjugation at the bibenzothiophene moiety in the o-carboranefused compound were obtained, whereas robust π-conjugation and significant emission from the intramolecular charge transfer state were detected from the nido-decaborane-fused compound. These data can be explained by the theoretical results that π-conjugation was restrictedly developed within the bibenzothiophene moiety in frontier orbitals of the o-carborane-fused compound. In contrast, π-conjugation can be constructed even through the distorted bibenzothiophene because of the nido-decaborane unit. Moreover, the intramolecular charge transfer state should be realized because of electronic interaction involving the nido-decaborane unit in the excited state. Furthermore, it was demonstrated that the nido-decaborane-fused compound possessed solid-state emission and mechanochromic luminescent properties. The π-conjugation on the distorted structure supported by the nido-decaborane anchor should play a significant role in suppressing aggregation-caused quenching followed by presenting solid-state emission with stimuli responsiveness.

Unveiling the charge density wave inhomogeneity and pseudogap state in 1T-TiSe_2

By using scanning tunneling microscopy(STM)/spectroscopy(STS), we systematically characterize the electronic structure of lightly doped 1 T-TiSe_2, and demonstrate the existence of the electronic inhomogeneity and the pseudogap state. It is found that the intercalation induced lattice distortion impacts the local band structure and reduce the size of the charge density wave(CDW) gap with the persisted 2 × 2 spatial modulation. On the other hand, the delocalized doping electrons promote the formation of pseudogap. Domination by either of the two effects results in the separation of two characteristic regions in real space, exhibiting rather different electronic structures. Further doping electrons to the surface confirms that the pseudogap may be the precursor for the superconducting gap. This study suggests that the competition of local lattice distortion and the delocalized doping effect contribute to the complicated relationship between charge density wave and superconductivity for intercalated 1 T-TiSe_2.

Photophysical and photochemical processes of riboflavin (vitamin B_2) by means of the transient absorption spectra in aqueous solution

Using time-resolved techniques of 337 and 248 nm laser flash photolysis, the photo physical and photochemical processes of riboflavin (RF, vitamin B2) were studied in detail in aqueous solution. The excited triplet state of riboflavin (3RF*) was produced with 337 nm laser, while under 248 nm irradiation, both3RF* and hydrated electron (eaq) formed from photoionization could be detected. Photobiological implications have been inferred on the basis of reactivity of3RF* including energy transfer, electron transfer and hydrogen abstraction. The RF·+ was generated by oxidation of SO4 ·-radical with the aim of confirming the results of photolysis.

Effect of didrovaltrate on l-calcium current in rabbit ventricular myocytes

OBJECTIVE:To investigate the effect of didrovaltrate on L-type calcium current(I Ca-L) in rabbit ventricular myocytes.METHODS:We used the whole cell patch clamp recording technique.RESULTS:Didrovaltrate at concentrations of 30 μg/L and 100 μg/L significantly decreased peak I Ca-L(I Ca-Lmax) from(6.01±0.48) pA/pF to(3.45±0.27) pA/pF and(2.16 ± 0.19) pA/pF(42.6% and 64.1%,n=8,P< 0.01),respectively.Didrovaltrate shifted upwards the current-voltage curves of I Ca-L without changing their active,peak and reverse potentials.Didrovaltrate affected the steady-state inactivation of I Ca-L.The half activation potential(V 1/2) was significantly shifted from(-26 ± 2) to(-36 ± 3) mV(n=6,P<0.05),with a significant change in the slope factor(k)(from 8.8 ± 0.8 to 11.1 ± 0.9,n=6,P<0.05).Didrovaltrate did not affect the activation curve.CONCLUSION:Didrovaltrate blocks I Ca-L in a concentration-dependent manner and probably inhibits I Ca-L in its inactive state,which may contribute to its cardiovascular effect.