Buried water-conducting and water-bearing structures in front of the driving head may easily lead to water bursts in coal mines. Therefore,it is very important for the safety of production to make an accurate and time...Buried water-conducting and water-bearing structures in front of the driving head may easily lead to water bursts in coal mines. Therefore,it is very important for the safety of production to make an accurate and timely forecast about water bursts. Based on the smoke ring effect of transient electromagnetic fields,the principle of transient electro-magnetic method used in detecting buried water-bearing structures in coal mines in advance,is discussed. Small multi-turn loop configurations used in coal mines are proposed and a field procedure of semicircular sector scanning is presented. The application of this method in one coal mine indicates that the technology has many advantages compared with others. The method is inexpensive,highly accurate and efficient. Suggestions are presented for future solutions to some remaining problems.展开更多
为避免和消除严重影响电网安全稳定的电磁环网结构,提出了一种分阶段进行的电磁环网开环方案优化决策方法。首先,根据枢纽站的分布情况和电网的结构特性,应用GN分裂算法将低电压等级电网划分为若干个分区,并按照各个分区被划分出来的顺...为避免和消除严重影响电网安全稳定的电磁环网结构,提出了一种分阶段进行的电磁环网开环方案优化决策方法。首先,根据枢纽站的分布情况和电网的结构特性,应用GN分裂算法将低电压等级电网划分为若干个分区,并按照各个分区被划分出来的顺序形成电磁环网的开环方案集合。然后,在综合考虑提高系统安全稳定性和限制短路电流关系的基础上,基于层次分析法建立了开环方案综合评价模型,应用模糊综合评价算法对各个开环方案进行定量评价。实际特高压电网仿真结果表明,该方法为形成电磁环网开环方案提供了理论依据,满足运行规划中离线计算的速度要求。通过对开环方案进行系统性优化决策,山东特高压电网划分成2个500 k V分区,济南电网划分成3个220 k V分区。展开更多
基金Project 40674074 supported by the National Natural Science Foundation of China20050290501 by the Specialized Research Fund for the Doctoral Programof Higher EducationD200409 by the Scientific Research Fund for Youth of China University of Mining & Technology
文摘Buried water-conducting and water-bearing structures in front of the driving head may easily lead to water bursts in coal mines. Therefore,it is very important for the safety of production to make an accurate and timely forecast about water bursts. Based on the smoke ring effect of transient electromagnetic fields,the principle of transient electro-magnetic method used in detecting buried water-bearing structures in coal mines in advance,is discussed. Small multi-turn loop configurations used in coal mines are proposed and a field procedure of semicircular sector scanning is presented. The application of this method in one coal mine indicates that the technology has many advantages compared with others. The method is inexpensive,highly accurate and efficient. Suggestions are presented for future solutions to some remaining problems.
文摘为避免和消除严重影响电网安全稳定的电磁环网结构,提出了一种分阶段进行的电磁环网开环方案优化决策方法。首先,根据枢纽站的分布情况和电网的结构特性,应用GN分裂算法将低电压等级电网划分为若干个分区,并按照各个分区被划分出来的顺序形成电磁环网的开环方案集合。然后,在综合考虑提高系统安全稳定性和限制短路电流关系的基础上,基于层次分析法建立了开环方案综合评价模型,应用模糊综合评价算法对各个开环方案进行定量评价。实际特高压电网仿真结果表明,该方法为形成电磁环网开环方案提供了理论依据,满足运行规划中离线计算的速度要求。通过对开环方案进行系统性优化决策,山东特高压电网划分成2个500 k V分区,济南电网划分成3个220 k V分区。
