在电力设计中,电气设备和载流导体的选择必须进行短路电流的计算.针对通常计算短路电流是以手工形式进行的问题,提出了短路电流的计算机算法.该算法根据电力网络特点及同步电机过渡过程理论,采用导纳矩阵法,推导出求解转移阻抗的数学模型,经换算进一步得到电源的运算阻抗,再用插值法查取存入计算机中的相应的运算曲线,以代替人工查'运算曲线数字表',从而自动实现短路电流的求解,算法简单可行.根据该算法编写的程序,可计算具有1 000个节点、2 000条支路、300台发电机和150个故障点的网络的三相短路电流计算.程序中插值法计算结果的小数点后3～4位有效数字与'运算曲线数字表'一致.对于具有20个节点的小型电力网络系统来说手工计算需要2 d,而通过计算机计算只需10 min.
The paper focuses on the method of formal concept analysis in data analyzing for software process improve-ment. It sets up that not only the Software Quality Guarantee Platform being developed should have the commonfu...
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The paper focuses on the method of formal concept analysis in data analyzing for software process improve-ment. It sets up that not only the Software Quality Guarantee Platform being developed should have the commonfunctions including enterprise process defining, process cutting out, executing and monitoring, and the normal dataanalysis tools such as OLAP, but also one should develop the novel data analysis tools based on formal methodologyby starting with maturity definition of process data, so as to discover valuable new knowledge from large database andsupport continuous software process improvement. Further more ,the paper demonstrates the software process dataanalysis using concept lattice in an example.
The well-known AGE(Alternating Group Explicit)method is extended for solv-ing the two-dimensional parabolic with variable coefficients and the unconditional stability of the AGE method is proved by the energy method i...
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The well-known AGE(Alternating Group Explicit)method is extended for solv-ing the two-dimensional parabolic with variable coefficients and the unconditional stability of the AGE method is proved by the energy method in the discrete L2-norm.
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