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    Supported by the National Natural Science Foundation of China (No. 50077006), in this thesis, the numerical methods for electromagnetic fields of substations’ grounding systems in frequency domain are researched and applied to practice.
    本文基于矩量法,结合国家自然科学基金项目“变电站瞬态电磁环境的预测计算方法研究”(项目编号:50077006),提出了完整的分析变电站接地网接地性能的频域电磁场数值计算方法并将其应用到实际工程中。
    This work was supported by HuBei Province Natural Science Foundation (Grant No. 2001ABB075)
    本课题得到了湖北省自然科学基金项目(2001ABB075)的资助。
    Supported by National Natural Science Foundation of China under grant No. 50077006,the numerical methods to predict the transient electromagnetic environments when thecircuit breakers and disconnect switches are operated in air-insulated substations andgas insulated substations are researched in this paper. The main contributions are asfollows:
    本文结合国家自然科学基金资助项目“变电站瞬态电磁环境的预测计算方法研究”(项目编号:50077006),重点研究了空气绝缘变电站和气体绝缘变电站由于开关操作产生的瞬态电磁过程及其瞬态电磁环境的数值预测方法,主要研究成果如下:
    Supported by the National Natural Science Foundation of China (No. 50077006) and the Teaching and Research Award Program for Outstanding Young Teachers in Higher Eduacation Institutions of MoE, P.R. C, the thesis researches the following electromagnetic compatibility problems in substations:
    本文结合国家自然科学基金项目“变电站瞬态电磁环境的预测计算方法研究”(50077006)和高等学校优秀青年教师教学科研奖励计划项目“电力系统电磁兼容关键问题研究”(教人司[2001]182号),对如下变电站电磁兼容问题进行了研究:
    This dissertation is devoted to " Research on theory and control strategy of nonlinear vibration in switched reluctance motor ", which is supported by the National Natural Science Fund(59977005).
    本论文的研究工作是结合国家自然科学基金资助项目“开关磁阻电动机非线性振动理论及控制策略研究(59977005)”进行的。
    50007002; 50228707 supported by NSFCnon-commensurable objectives, such as the fuel cost, the pollution emission and the systemactive power losses are all taken into account.
    仿真结果表明,采用*国家自然科学基金资助项目(No.50007002; 50228707)多目标进化方法设计的 PSS 控制器,可以有效地阻尼电力系统的多模振荡。
    As a part of National Nature Science Foundation of China (No:59977012), the study mainly focuses on the topology of main circuit and control strategy about soft-switching three-phase PWM inverter, which is to explore a practical soft-switching three-phase PWM inverter topology and in order to provide for industry a feasible soft-switching three-phase PWM inverter scheme, its operation mechanism is investigated.
    本课题是国家自然科学基金项目(批准号:59977012)的一部分,研究软开关三相PWM逆变器主电路拓扑结构及其控制策略,旨在探索一种实用的软开关三相PWM逆变器,研究其工作机理,为产业提供一种可行的软开关三相PWM逆变器方案。
    The reason of resonant slot abnormity in the experiment has been discussed and the relationship between PWM gating signals of soft-switching inverter and resonant timing has also been demonstrated, so the normal realization of soft-switching action is guaranteed.
    为了进一步提高软开关三相PWM逆变器的效率,也作为本自然科学基金项目的进一步发展,提出了一种谐振交流环节ZVT软开关三相PWM逆变器主电路拓扑。 该逆变器主电路的辅助谐振换流电路仅采用一个功率开关器件,具有结构简单,系统成本低,控制方便等优点。
    Supported by the Nation Key Project (G1999022302) and the NSF of China (90210032), this research is to propose a new approach to utilize the natural gas and coal synthetically and reveal the internal phenomena during the energy conversion, to develop a new exergy analysis tool to analysis the new energy releasing process, and to proposed a new multi-functional energy system with advantage features.
    本文依托国家重点基础研究发展规划973计划项目“新型广义总能系统与其全息性能和规律”和国家自然科学基金重大研究计划重点项目“适合西部多功能能源系统”,研究多能源综合互补的多功能能源系统的若干关键问题,主要包括多种化石能源综合互补方法与机理、适用于多功能系统复杂能量转化利用过程的(火用)分析方法以及新系统集成开拓等三个方面。
    This dissertation has project background of the National Natural Science Foundation which is titled "Precision direct driving technology and control strategy research on slewing servo of numerical controlled machine tool (No.50375102)". Focus on key research and status in quo about direct driving technology, linear machine and its control method have been studied.
    本文以国家自然科学基金项目:“数控机床回转送进精密直接驱动技术及其控制策略研究(项目批准号:50375102)”为背景,从直接驱动系统的应用现状和当前研究的热点问题出发,对直线电机技术及其控制技术进行研究。
    Supported by National Natural Science Foundation of China (No.50077006) and Natural Science Foundation of Hebei Province (No.503424), the setup method of circuit model for instrument transformer and transient electromagnetic interference to the secondary equipments through conductive coupling due to switching operations in Gas Insulated Substation (GIS) are researched in this paper.
    本文结合国家自然科学基金项目“变电站瞬态电磁环境的预测计算方法研究”(项目编号:50077006)和河北省自然科学基金项目“气体绝缘变电站电磁环境与电磁干扰预测计算的研究”(项目编号:503424),重点研究了气体绝缘变电站互感器高频电路模型的建立方法和开关操作通过传导耦合对二次设备的干扰问题。
    This subject is studied according to advisor's project "The theory of switched reluctance motor nonlinear vibration and the research of control strategy", which is subsidized by the National Natural Science Fund.
    本课题结合导师在研项目国家自然科学基金(59977005)“开关磁阻电动机非线性振动理论及控制策略研究”进行。
    This subject is studied according to advisor's project "The theory of switched reluctance motor nonlinear vibration and the research of control strategy", which is supported by the National Natural Science Fund.
    本课题结合导师在研项目——国家自然科学基金(59977005)“开关磁阻电动机非线性振动理论及控制策略研究”进行。
    This subject is studied according to advisor's project "The theory of switched reluctance motor nonlinear vibration and the research of control strategy", which is supported by the National Natural Science Fund(59977005).
    本课题结合导师在研项目——国家自然科学基金资助项目(59977005)“开关磁阻电动机非线性振动理论及控制策略研究”进行。
    This paper is supported by "Nation Natural Science Fund— Study on New Principle of Transformer Protection Based on the Nonlinear Behavior of Energizing Circuit", The serial number is 50277012 。
    本论文得到了“国家自然科学基金”项目《基于励磁支路非线性的变压器新原理的研究》(项目号50277012)的资助。
    The paper gains the bankroll of national fund of natural science, whose item is "Research of transformer's new theory based on non-linear excitation spur track"(item NO.50277012)。
    本论文得到了“国家自然科学基金”项目《基于励磁支路非线性的变压器新原理的研究》(项目号50277012)的资助。
    This dissertation is studied according to advisor's project " The theory of switched reluctance motor nonlinear vibration and the research of control strategy ", which is supported by the National Natural Science Fund (59977005) .
    本课题结合导师在研项目——国家自然科学基金资助项目(59977005)“开关磁阻电动机非线性振动理论及控制策略研究”进行。
    59977004, the Natural Science Foundation of Anhui Province under the grant No. 00104421 and doctor-point financially supported by the Education Ministry of China.
    本文的研究工作得到了国家自然科学基金(59977004)、安徽省自然科学基金(00104421)和教育部博士点基金资助。
    The background of the thesis is "Theory of Dynamic Precision synchronization Traverse and Research of Realization Methods for Linear Servo Dual Position Loops System (NO.50075057)", which is supported by National Natural Science Foundation of China. In this paper,we introduce a theory of Nonlinear PID control and put it in the system of motor's synchrodrive control. The method how to design a Nonlinear PID co trailer is also introduced.
    本文以国家自然科学基金资助项目《直线伺服双位置环动态精密同步进给理论和实现方法研究(NO.50075057)》为背景,将非线性PID控制理论应用于电机的同步控制当中,给出了非线性PID控制器的设计方法,并且与传统线性PID控制下的控制系统做了比较,验证了该方法的有效性。
 

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