电力系统可视化技术研究及应用

电网规模的增大和数据量的增多,需要更先进更直观的工具和手段来帮助调度员实现对电网的及时有效监控,可视化是目前从人机界面角度实现上述功能最有效的技术手段。文章阐述了可视化技术的发展历史以及可视化的技术理论基础。重点描述了一体化设计的可视化系统的几种展示手段和产品的特点。该系统已经在某省调EMS系统中得到应用。     

Design and Processing of Bimetallic Aluminum Alloys by Sequential Casting Technique

Metallurgical and Materials Transactions A - Sequential casting is a facile and fairly new technique to produce functionally graded materials (FGMs) and components by controlled mold filling...     

A study on bioethanol production from cashew apple pulp and coffee pulp waste

Bioethanol production from dry cashew apple pulp and coffee pulp was investigated. The pulp was digested with 2% sulfuric acid and subjected to high pressure (15 psi) cooking at 120 °C for 10 min followed by further 1 and a half hour pressure cooking at 90 °C to solubilize the pulp. Solubilized pulp was filtered and the debris on the filter paper was washed with minimum quantity of distilled water and then oven dried to find the weight of the insoluble lignin mass. Total sugar content in squeezed and dried cashew apple pulp (CAP), dry coffee pulp (DCP) and wet coffee pulp (WCP) was found to be 2.12, 1.62 and 0.62 g/100 ml of hydrolyzate. Reducing sugar content in squeezed CAP, DCP and WCP was found to be 0.14, 0.71and 0.23g/100 ml of hydrolyzate. Filtrate was neutralized with thick suspension of calcium hydroxide slurry until the pH reaches to 6.0. Neutralized slurry was kept at lab temperature overnight and the supernatant was decanted through filter paper. To 150 ml of filtrate yeast (Saccharomyces creviciae) was added at a concentration of 5.0 g/l concentration and subjected to fermentation for 48 h at 30 °C in a shaker incubator at 120 rpm. Ethanol content in the fermented broth was estimated by titrimetric and gas chromatographic method. Ethanol yield in the fermented broth was found to be 0.5, 0.46 and 0.46 g/g of sugar in squeezed CAP, DCP and WCP. Theoretical ethanol yield (Y_max%) of squeezed CAP, DCP and WCP was found to be 46, 9.35 and 40% respectively.     

A sensitivity-based approach for studying stability impact of distributed generation

In this paper we investigate the impact of distributed generation (DG) on system stability using the trajectory sensitivity approach and identify the machines that are vulnerable to the addition of DG. We also vary the penetration level of DG and evaluate the influence of the DG modeling. Sensitivity formulation for the differential-algebraic equation model is presented through a single-machine infinite-bus (SMIB) example. The methodology can be extended to study the influence of parameters other than the clearing time, such as series line reactance.