建筑电气设计规范条款的探讨和应用

从设计实际工程出发，对建筑电气设计规范中自备电源及不间断电源的有关条款进行了深入地探讨，给出了多台发电机组选择以及联运行技术规范的理论依据和使用原则，并将其应用到实际工程设计中，进一步验证了规范的指导意义。     

高等教育产业中的混合经济——政府与市场的角色定位

高等教育产业在越来越开放的社会经济大环境中,不得不面临着改革的压力,政府与市场在高等教育产业中的角色是高等教育产业改革的关键,并且由于高等教育产业的特殊性而复杂化。     

拉伸半无限圆孔板应力集中系数研究

用近似解析方法推出了拉伸半无限圆孔板孔边最大应力集中系数的显式表达式，此式不但形式简单而且具有良好的精度。对该式的精度验证采用两条路径：1）与应力集中系数手册结果（无显式表达式，只有曲线）比较；2）与有限元计算结果比较，所推公式（当d/a≥1.2）的精度得到证实。同时应该指出，Jeffery给出了的仅有的几个具体理论值在圆孔比较靠近直线边界时误差较大，但至今Jeffery的结果仍被当成经典数据或准确值被引用，本文的工作支持西田正孝编著的应力集中系数手册认为Jeffery解“有错误”的指正。此外，分别用Koiter的近似解析方法和有限元法证实，采用本文新定义的应力集中系数（即用最大应力点所在的邻近一侧截面上的平均应力为基准应力），当圆孔非常靠近直线边界（1＜d/a＜1．2)时有一个极限值2。     

基于STEP的CAD/CAM知识模型和表达的研究

讨论了EXPERSS标准语言的知识表达能力,给出了采和EXPRESS表达的知识模型以及建模规则,根据CAD/CAM产品模型的特点,提出了基于特征的知识,并给出了建模的约束规则表达,以及与知识库的集成.     

Guaranteed H∞ robustness bounds for Wiener filtering and prediction

The paper deals with special classes of H_∞ estimation problems, where the signal to be estimated coincides with the uncorrupted measured output. Explicit bounds on the difference between nominal and actual H_∞ performance are obtained by means of elementary algebraic manipulations. These bounds are new in continuous‐time filtering and discrete‐time one‐step ahead prediction. As for discrete‐time filtering, the paper provides new proofs that are alternative to existing derivations based on the Krein spaces formalism. In particular, some remarkable H_∞ robustness properties of Kalman filters and predictors are highlighted. The usefulness of these results for improving the estimator design under a mixed H₂/H_∞ viewpoint is also discussed. The dualization of the analysis allows one to evaluate guaranteed H_∞ robustness bounds for state‐feedback regulators of systems affected by actuator disturbances. Copyright © 2001 John Wiley & Sons, Ltd.     

电力市场均衡点的探讨

本文从各发电商和购电商的经济利益出发，提出了一种确定电力市场均衡点的方法，并采用遗传算法进行求解，为了尽可能满足负荷需求，本文提出了罚款，以防止或减少发电商在负荷高峰期的投机行为，此外，还考虑了远期合约的影响，算例结果表明在电力市场中采取一定的调控措施的必要性。     

湖北省电厂大型燃煤锅炉调峰能力分析与建议

简要介绍了湖北省200MW及以上大型燃煤锅炉机组的运行特性、设计调峰性能，以及经过对燃烧器进行低负荷稳燃改造以后，调峰能力的改善。这些机组目前的调峰性能指标，可作为调峰运行调度的参考。     

配电变压器的晶闸管串联调压方法

提出了晶闸管开关装置串联调节配电变压器电压的接线原理，给出了晶闸管开关装置的接线系数和相应的理想变压器电路模型，分析计算了装置各个具体接线状态。     

220kV直降式第三绕组调压整流变压器的研制综述

介绍了国内首台220kV直降式第三绕组调压整流变压器的研制，开发过程，从产品设计工艺，生产及试验等各个过程分析了产品的特点。     

Frequency security constrained short-term unit commitment

In island grids and weakly interconnected power systems, a loss of a large proportion of generation will cause the system frequency to fall dramatically. In order to ensure a stable operation with the lowest impact on the system, the disturbed power balance must be equalized within a short specified time by activating the seconds reserve of on-line units or by load shedding or both. This paper presents a frequency security constrained short-term scheduling. The procedure commits and optimizes units, calculates necessary seconds reserve capability, and allocates them among the available on-line units to provide emergent frequency regulation following a loss of generation. By means of the low-pressure pre-heater interruption (LPHI) implemented into thermal power plants, seconds reverse provision is increased. Thus, load shedding caused by insufficient availability of seconds reserve can be avoided. A case study on typical island systems with a large number of different units is demonstrated using the proposed procedure. Results from the study validated robust performance of the proposed procedure that minimizes fuel costs while maintaining frequency security condition.