This paper surveys a number of recent advances in the error analysis in the frequency domain for a digital simulation model. It is emphasized to discuss the errors in characteristic roots and transfer funcnon of the d...This paper surveys a number of recent advances in the error analysis in the frequency domain for a digital simulation model. It is emphasized to discuss the errors in characteristic roots and transfer funcnon of the digital simulation model, the frequency domain errors of the data transfers between thesimulation submodels, and some compensation methods for the errors. Some of the questions to be answered are also presented.展开更多
In order to testify and examine the ability and correctness of an expert system for diagnosing the faults in the electrical power system of a certain kind of satellite, the authors have developed a simulated testbed a...In order to testify and examine the ability and correctness of an expert system for diagnosing the faults in the electrical power system of a certain kind of satellite, the authors have developed a simulated testbed according to the operational principle of the electrical power system. This paper takes the solar battery array as an instance to introduce the designing principle of its hardware circuits, and presents the methods to design the interface and the software program of the single-chip microprocessor system. The software scheme of the upper computer is introduced at the end of this paper. It has been proved that this simulated system could effectively achieve the complete functions coupled with the simple design by using of various mature techniques in the fields of electronic circuits, single-chip microprocessor and numerical emulation.展开更多
This paper mainly discusses the following problems: the important meaning and special function of simulation system; the definition, contents and relationship of system and system simulation science; the definition an...This paper mainly discusses the following problems: the important meaning and special function of simulation system; the definition, contents and relationship of system and system simulation science; the definition and technology of simulation system and its equipments; and systematic description and exploration in relation to the developing trend of system simulation science and simulation system technology.展开更多
频率响应分析法(frequency response analysis,FRA)是一种有效检测变压器内部绕组变形故障的方法。然而,在传统的FRA法中,通常仅使用幅值响应来解释FRA特征,而相位响应的重要性尚未得到充分重视。针对以上问题,该文提出一种基于频响重...频率响应分析法(frequency response analysis,FRA)是一种有效检测变压器内部绕组变形故障的方法。然而,在传统的FRA法中,通常仅使用幅值响应来解释FRA特征,而相位响应的重要性尚未得到充分重视。针对以上问题,该文提出一种基于频响重构和数字图像处理的变压器绕组变形故障诊断方法。该方法首先将频率、幅值和相位元素融合在一个三维坐标图中,并应用图像处理技术进行纹理分析特征提取。随后,利用图像平方和比误差(image sum square ratio error,ISSRE)的三角坐标统计图实现了故障类型分类,并总结了绕组故障类型判别的参数化阈值指标。然后,基于极坐标频率响应特性,提出了能够识别绕组故障程度的定量化指标图像平方和最大-最小比误差(image sum square max-min ratio error,ISSMMRE)。最后,在1台定制电力变压器上进行了各种故障的实验验证,证明了该方法的有效性和可行性,为FRA方法的改进和自动化提供了新的思路和方法。展开更多
文摘This paper surveys a number of recent advances in the error analysis in the frequency domain for a digital simulation model. It is emphasized to discuss the errors in characteristic roots and transfer funcnon of the digital simulation model, the frequency domain errors of the data transfers between thesimulation submodels, and some compensation methods for the errors. Some of the questions to be answered are also presented.
文摘In order to testify and examine the ability and correctness of an expert system for diagnosing the faults in the electrical power system of a certain kind of satellite, the authors have developed a simulated testbed according to the operational principle of the electrical power system. This paper takes the solar battery array as an instance to introduce the designing principle of its hardware circuits, and presents the methods to design the interface and the software program of the single-chip microprocessor system. The software scheme of the upper computer is introduced at the end of this paper. It has been proved that this simulated system could effectively achieve the complete functions coupled with the simple design by using of various mature techniques in the fields of electronic circuits, single-chip microprocessor and numerical emulation.
文摘This paper mainly discusses the following problems: the important meaning and special function of simulation system; the definition, contents and relationship of system and system simulation science; the definition and technology of simulation system and its equipments; and systematic description and exploration in relation to the developing trend of system simulation science and simulation system technology.
文摘频率响应分析法(frequency response analysis,FRA)是一种有效检测变压器内部绕组变形故障的方法。然而,在传统的FRA法中,通常仅使用幅值响应来解释FRA特征,而相位响应的重要性尚未得到充分重视。针对以上问题,该文提出一种基于频响重构和数字图像处理的变压器绕组变形故障诊断方法。该方法首先将频率、幅值和相位元素融合在一个三维坐标图中,并应用图像处理技术进行纹理分析特征提取。随后,利用图像平方和比误差(image sum square ratio error,ISSRE)的三角坐标统计图实现了故障类型分类,并总结了绕组故障类型判别的参数化阈值指标。然后,基于极坐标频率响应特性,提出了能够识别绕组故障程度的定量化指标图像平方和最大-最小比误差(image sum square max-min ratio error,ISSMMRE)。最后,在1台定制电力变压器上进行了各种故障的实验验证,证明了该方法的有效性和可行性,为FRA方法的改进和自动化提供了新的思路和方法。
