METHOD FOR CONTROLLING SYNCHRONOUS MACHINE EXCITATION Russian patent published in 2004 - IPC

FIELD: electrical engineering; exciting synchronous machines using bilateral-conduction converter.

SUBSTANCE: proposed method includes measurement of synchronous machine speed and as soon as it rises to value sufficient for machine synchronization, bilateral-conduction converter is switched over for running as rectifier; then dc voltage is applied to synchronous machine field winding, load angle of machine is measured, and output voltage of bilateral-conduction converter is cyclically controlled at speed lower than that sufficient for machine synchronization to change over this converter from positive to negative voltage mode by reversing polarity of voltage (voltage meander) applied to field winding as function of load angle. At load angle varying between -π/2 to +π/2 negative polarity of bidirectional-conduction converter output voltage is set. At load angle varying between π/2 and 3π/2 positive polarity of converter output voltage is set and converter is changed over to operation as inverter with its current and output voltage being of different polarity. Converter is switched over for running as rectifier when its current and output voltage are of same polarity. Then preset maximal voltage of bidirectional-conduction converter is raised in proportion to load angle measurement error.

EFFECT: enhanced output torque of synchronous machine.

1 cl, 12 dwg