基于模糊神经网络的MCR电压无功控制

针对磁控电抗器MCR恒压/恒功率因数控制模式无法兼顾电压及功率因数的不足,提出综合考虑电压及功率因数的模糊神经网络加权控制策略,详细阐述模糊神经网络控制器的结构及其参数调整方法,设计由恒压和恒功率因数模糊神经网络控制器组成的控制系统,控制MCR输出的感性无功。算例仿真结果表明,该控制系统具有良好的负载跟踪特性,能实时跟踪电网电压及功率因数的变化;与传统PI闭环控制模式相比,具有超调量更小及响应时间更短等特点。     

用国产MCR替代TCR对500 kV云田变电站SVC进行技术改造

介绍了500kV云田变电站SVC的基本情况和当前存在的难以维持继续运行的缺陷。根据电网无功电压调整的需要,用国产MCR替代TCR,组成基于MCR的SVC进行技术改造是上策。     

磁阀式可控电抗器在高压电机软起动中的应用

在比较各种软起动方式的基础上,提出了一种新型电机磁控软起动方案,即在电动机定子回路串入磁饱和可控电抗器来实现电机的软起动,能保证电动机按负载要求的起动特性平滑起动,有效地降低电机起动对电网的冲击。     

Rapid Discovery of Aspartyl Protease Inhibitors Using an Anchoring Approach

Pharmacophore searches that include anchors, fragments contributing above average to receptor binding, combined with one-step syntheses are a powerful approach for the fast discovery of novel bioactive molecules. Here, we are presenting a pipeline for the rapid and efficient discovery of aspartyl protease inhibitors. First, we hypothesized that hydrazine could be a multi-valent warhead to interact with the active site Asp carboxylic acids. We incorporated the hydrazine anchor in a multicomponent reaction and created a large virtual library of hydrazine derivatives synthetically accessible in one-step. Next, we performed anchor-based pharmacophore screening of the libraries and resynthesized top-ranked compounds. The inhibitory potency of the molecules was finally assessed by an enzyme activity assay and the binding mode confirmed by several soaked crystal structures supporting the validity of the hypothesis and approach. The herein reported pipeline of tools will be of general value for the rapid generation of receptor binders beyond Asp proteases.     

双级饱和磁控SVC补偿电铁牵引不平衡负荷的研究

由于电气化铁路运行的不对称性,会产生快速波动的负序电流,并流入电力系统各处,对系统发电、供电设备产生严重的不良影响.首先分析了目前负序电流的抑制方法、存在问题,并提出采用磁控SVC,即双级饱和磁控电抗器与固定电容器并联,进行无功、负序综合治理,并通过仿真对其可行性进行了验证.     

Fast analysis of 4 phenolic acids in olive oil by HPLC-DAD and chemometrics

Polyphenols are important components of virgin olive oils, due to their antioxidant properties. Among the various analytical methods proposed for their determination, HPLC plays a dominant role, both coupled to UV-spectrophotometric and MS detection of the eluted component. However, the optimal time required for the full separation of all the components can be quite long. In this study, we investigated the possibility of reducing the analytical time of HPLC-DAD analysis of polyphenols by allowing the overlapping and coelution of some peaks, whose signals were separated off-column by two- and three-way resolution methods. In particular, we focused our attention on a peak where four phenolic acids (syringic acid, vanillic acid, p-hydroxybenzoic acid, and caffeic acid) coeluted. Both MCR-ALS and PARAFAC2 provided a good resolution of the peaks in the case of training and test samples, however the former technique provided the better results.     

MCR型SVC在轧钢供电系统中的仿真与应用

针对某轧钢厂10 kV母线的电能质量治理问题,将MCR型静止型动态无功补偿器(SVC)应用于该厂供电系统的改造。介绍了MCR型SVC的工作原理及特点,根据该厂10 kV母线的实际负荷情况,利用Matlab/Simulink仿真软件,搭建MCR型SVC仿真模型并进行仿真设计。实测数据表明,MCR型SVC在10 kV轧钢供电系统中能够有效地提高功率因数、抑制谐波,说明所采用的工程设计结合仿真分析的方法取得了良好的效果。     

110kV风电场升压站MSVC型动态无功补偿装置的应用

MCR型SVC装置(MSVC)是提高功率因数、改善电能质量、节约能源、提高系统稳定性等方面的理想选择。本文以实际工程为例,给出了110 kV风电场升压站工程35 kV MSVC成套装置的方案、功能设计、结构、控制策略等要求,指出了MSVC是一种较为合理的动态无功补偿方式,在动态无功补偿性价比方面具有一定的优势。     

基于分级磁阀结构的三相磁控电抗器谐波抑制研究

为了降低磁控电抗器MCR产生的谐波对电网的影响,笔者提出将MCR工作铁心设计为分级磁阀结构,并建立了这种铁心结构的磁路等效数学模型。在分析一般磁控电抗器谐波分布特性的基础上,给出了分级磁阀结构电抗器的谐波抵消原理。计算结果表明分级磁阀结构电抗器将现有MCR半极限饱和条件下输入电网的最大谐波电流含量由6%降低到3%。     

基于微滤工艺处理微污染地表水的一体化设备开发研究

本文报导了一体化膜混凝反应器(MCR)，该设备采用连续进水、间歇出水的运行方式，对Ⅱ类和V类及劣V类地表水进行处理。结果表明：MCR对浊度、有机物和细菌有良好的去除效果；采用合适的投药量，出水水质可以满足生活饮用水卫生规范(2001)的要求。试验从2002年7月运行到12月，滤饼层和膜污染阻力之和仅占膜总阻力的25．4％；对膜进行清洗，发现膜比通量能恢复到新膜的99．7％。