【作者】 马新惠；

【导师】 马士英； 周任军；

【作者基本信息】 长沙理工大学 ， 电力系统及其自动化， 2011， 硕士

【摘要】 电力系统短路电流计算是发电厂、变电所等工程设计工作中重要的设计计算内容之一,短路电流计算结果的精确性直接影响到工程建设的经济性和运行的安全性、可靠性。由于电力系统结构复杂,国内外一直以来都在不断研究和改进电力系统短路电流计算方法。随着大型发电厂的单机容量、总装机容量和互联电力系统的容量不断增大,短路电流水平越来越高,所需的高压开关电器开断能力越来越接近现有技术的极限制造能力,设计部门需要精确可靠的短路电流计算结果。现有以运算曲线为基础的手工短路电流计算和稳态短路电流计算机计算软件,已不能满足工程设计的需要。为了满足实际工程设计对短路电流计算精度和简便性的要求,文章采用了短路电流暂态解析法计算,并设计开发了该算法软件。短路电流暂态解析法计算软件开发以电力网络节点导纳矩阵为数学模型,系统元件阻抗不仅计及了电抗,更计及了电阻,同时引入了等效电压源的电压系数c,确定了计算方法流程,设计了算法软件开发思路,研究了系统元件电阻电抗计算模块和短路电流计算模块等各种数据编程模块,给出了各数据编程模块子程序具体流程,并在此基础上采用面向对象的C#语言,编制了各数据功能模块子程序,实现了短路电流计算软件开发。选择国标三相交流系统短路电流计算中的算例,测试了开发的软件在电力系统短路电流计算中的科学可靠性和简便高效性。软件测试过程证明,开发的短路电流计算软件,能得到如计算三相短路、两相短路、单相接地短路等短路电流结果,计算结果精确,能为电气设备选型等提供更可靠的科学依据;而且能较好地适应工程实际的需要,只要把系统元件原始参数输入到界面中,即可自动转化为电阻电抗显示在节点编辑里,短路电流计算更加简便;计算软件不仅实现了短路电流的输出,同时实现了短路电流计算中间重要数据节点导纳矩阵、三角分解和短路点的短路自阻抗的输出,便于用户查看,发现问题,及时修改,提高工程设计工作效率。.更多还原

【Abstract】 Transient initial value of short circuit current account for power system is one of important designing count contents in the engineering designing works of power plants and electric power substations, the economy of engineering structure and security and reliability of function is directly infected by the accuracy of transient initial value about account result in the short circuit current. Because of configurable complexity of power system, different methods about account method of short circuit current for power system are been researching all the time at home and abroad. With the single-machine capacity of large-scale power plants, installed gross capacity and capacity of interconnected power system are continuously been augmenting, and the increasingly high levels of short circuit current, required breaking capacity of high voltage switch electric appliance is more and more close to the manufacturing capacity of currently technical high-point, account result of accurate and credible short circuit current is needed by design department. Currently handwork short circuit current account basing on the operation curve and steady state short circuit current account computer software, can not meet the needs of engineering designing requirement.Solved method of requisite problem about existing accuracy of short circuit current account is brought forward creatively in the main content of task, that is to say, transient state analytic method account of short circuit current and software exploitation. Introduced transient state analytic method account of short circuit current in the task is a numerical calculation method based on the system of differential equations about mathematic model of power system, the account flow of method is confirmed, and current software exploitation languages are taken all factors into consideration based on the account method, the object oriented C# language is adopted, the train of thought about software exploitation of account method,such as account module about resistance and reactance of element in the power system,account module of short circuit current, and so on are researched,the object oriented C# language is adopted, which is carried through software exploitation about transient state analytic method account of short circuit current, the software is validated by account example of GB three-phase AC system short-circuit current calculation and the validated result show that it is right and feasible in the short circuit current account of power system.Software testing process proved, the short circuit current calculations managed by the transient initial value optimization method are precise,they are provided with more scientific and reliable basis on selection of electrical equipment. The calculation software of transient analysis method of short circuit current can get calculations in different types of circuit current,such as three-phase circuit current, two-phase circuit current and single-phase short circuit .est.; and can better adapt to the needs of engineering, the original parameters of the system components as long as the input to the interface can be automatically converted into resistance reactance displayed on the node editing, the short-circuit current calculation easier; calculation software not only to achieve a short-circuit current output, while achieving a short-circuit current calculation of important data between nodal admittance matrix, triangular decomposition and short circuit since the impedance of the output short-circuit, user-friendly look and found the problem, be revised. So that short-circuit current calculations are more simplified in future, and can improve design efficiency.更多还原