Parameter measurement of multi-phase synchronous machines with AC and DC output

Many self-contained electrical systems require simultaneous AC and DC power supply. The hybrid AC-DC supply generator (HADSG) is a good solution. Several independent Y-connected windings are equipped on the stator of HADSG, one delivers AC power and the others, termed DC windings, are connected to the bridge rectifier. Methods of parameter measurement considering DC winding resistances are presented for a typical HADSG with a 12-phase DC winding in this paper. The d-axis self and mutual reactances can be acquired by various short-circuit tests for one or two three-phase windings. Relevant formulas are derived for calculating the d-axis parameters through measuring the short-circuit currents and voltages of all open three-phase windings. According to the voltages and currents measured in slip-tests for AC and DC windings, the q-axis self and mutual reactances can be obtained. Using these reactances in the simulation program, the simulation and test results agree quite well.