交交变频器-同步电动机系统等效电路模型及电流调节器设计

在分析同步电动机交交变频调速系统运行的基础上，提出了把同步电动机的d、q轴各变量分解为低频分量(含非周期分量)和高频分量分别加以处理，忽略转子回路对高频分量的电阻以及阻尼绕组对低频分量作用的分析方法。进而建立了适合于稳态和似稳态分析的同步电动机等效电路模型；应用该模型，文中提出了设计调速系统电流控制器的新方法。运行试验及仿真结果表明所建立的等效电路模型是正确的，所提出的调节器设计方法是有效的。

EQUIVALENT CIRCUIT MODEL OF CYCLOCONVERTER-FED SYNCHRONOUS MOTOR SYSTEM AND DESIGN OF CURRENT CONTROLLER

A new analysis approach for analytic study of the cycloconverter-fed synchronous motor is proposed, based on the analysis of its operation characteristics. That is, the d- and q-axis variables of a synchronous motor are decomposed to low-frequency components (including aperiodic components) and high-frequency components, which can be treated separately. In this case, the resistances of rotor circuits to high-frequency components and the effect of damper winding on low-frequency components are negligible. Therefore, by using this analysis approach, the equivalent circuit model of a synchronous motor is obtained for steady-state and quasi-steady-state analysis. Furthermore, a new approach for designing current controller of the drive system is proposed, by using this equivalent circuit model. The experiment and simulation results show the equivalent circuit model established is correct, and the approach for designing current controller is reasonable.