交直流混合供电的三/十二相电机定子漏电抗计算

Calculation of Stator Winding Leakage Reactance of 3 and 12-Phase Machines with AC and DC Output

交直流混合供电的三/十二相电机因其显著的优点将被广泛应用于独立供电系统中,该电机定子上有两套绕组,一套三相绕组提供交流电,另一套十二相绕组整流后提供直流电。该电机定子槽中放置了四层不同线圈的导体,并且多套三相绕组同时工作时的气隙磁势也比普通三相电机复杂得多。利用解析的方法分析了三/十二相电机定子漏电抗的计算,导出了相关的公式,并计算了某三/十二相电机的定子漏电抗参数,利用这些参数计算值,对三/十二相电机的突然短路进行了仿真研究,仿真结果较好地吻合了实际样机的试验结果,验证了所计算的参数值的正确性。

phase synchronous machines with AC and DC output are being widely used in self-contained electrical power systems for their obvious virtues. On their stator, two separate windings are distributed, one three-phase winding delivers AC power and the other twelve-phase winding, termed DC windings, are connected to the bridge rectifier to supply DC power. Unlike ordinary three-phase machines, there are four layers winding in each stator slot of the 3/12-phase machine and the total air gap magnetometive force produced by the 12-phase winding is more complex than 3-phase machines. By analyzing the leakage magnetic flux and the magnetometive force, relevant formulas are derived to calculate the leakage reactances of the machines. All the stator leakage reactances of a realistic 3&12-phase machine were calculated through the methods presented and the simulation of a sudden short-circuit test of the machine was carried out with the parameters calculated. The simulation and test results agree quite well, and show that the formulas presented are correct.