Position sensorless control method for switched reluctance generator

A control method for a switched reluctance generator without a position sensor, and having a excitation power supply, windings of a switched reluctance generator, and a power converter composed of main switch and diodes with an upper tube S1 and a lower tube S2 in the power converter of the main switch of a phase in an ON state in the excitation stage, comprising the steps of:

• setting a threshold for the winding current of the phase, and detecting the winding current i of the phase;
• switching off either the upper tube S1 or the lower tube S2 in the power converter of the main switch of the phase when the winding current i of the phase rises to a preset threshold, so that the winding of the phase of the switched reluctance generator changes into a zero voltage natural freewheeling state and the winding current i of the phase begins to drop;
• and
• acquiring the end position b of maximum phase inductance of the phase when the rotor position of the switched reluctance generator is an end position b of maximum phase inductance of the phase when the winding current i of the phase drops to a valley value.

A method of controlling a switched reluctance generator without a position sensor, and having a excitation power supply, windings of a switched reluctance generator, and a power converter composed of main switch and diodes with an upper tube S1 and a lower tube S2 in the power converter of the main switch of a phase movable between an ON state and an OFF state, comprising the steps of:

• placing the upper tube S1 and the lower tube S2 into the OFF state in the excitation stage;
• setting a threshold for the winding current of the phase;
• detecting the winding current i of the phase;
• when the winding current i of the phase rises to a preset threshold, switching either the upper tube S1 or the lower tube S2 into the OFF state so that the winding of the phase of the switched reluctance generator changes into a zero voltage natural freewheeling state and the winding current i of the phase begins to drop;
• and
• acquiring the end position b of maximum phase inductance of the phase when the rotor position of the switched reluctance generator is an end position b of maximum phase inductance of the phase when the winding current i of the phase drops to a valley value.