同期機の電機子電圧変動に対する過渡現象の近似解析

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This paper presents approximate equations of transient currents and torque of synchronous machines during sudden three-phase short circuit phenomena and synchronizing phenomena. Although there are a lot of reports analyzing these problems, most of them study a relatively simple synchronous machine operated under special conditions which is easy to analyze; i.e., for example, three-phase short circuit for unloaded synchronous machines modeled to have one damper circuit both in d and q axis. However, recently more complicated models of synchronous machines with two or three damper circuits both in d and q axis are studied and used to analyze transient phenomena of synchronous machines.The analytical technique presented in this paper is developed on the basis of a new approximate method. The method studies an armature transient neglected model at first and derives the solution taking no effects of armature transient into consideration. Next, the components arising from the effects of armature transient is solved. The complete solution is obtained by adding these two solutions. In addition, the derived solution has a general form for damper structure. Thus, it is easy to obtain a particular solution for the synchronous machines with any number of damper circuits. To confirm the accuracy of the derived solution, numerical simulations of above two problems are carried out for the synchronous machine with three rotor circuits both in d and q axis. As a result, good agreements are obtained between the approximate solution and the exact solution obtained by simulating the basic differential equations
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同期機の電機子電圧変動に対する過渡現象の近似解析

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