Transient Analysis Method Account Of Short Circuit Current For Power System And Its Software Exploitation

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.