INDUCTION GENERATOR CONTROL PROCESS Russian patent published in 1997 - IPC

FIELD: power engineering; small hydroelectric power plants, wind-power plants, off-line low-power plants. SUBSTANCE: control process of induction generator excited from reactive-power source involves multiphase rectification of output voltage, its measurement and comparison with reference value, shaping of error signal of mentioned values and its conversion into pulse train controlling DC load current; error signal is shaped in the form of pulse train of length equal to time of rectified output voltage ripples exceeding reference value and spaces between mentioned pulses equal to time of reference voltage exceeding that of rectified output voltage ripples; control pulses are shaped from mentioned pulses with pulse or space duration exceeding desired minimal threshold pulse length of error signal by this desired value. Concurrently with conversion of error signal pulses into control pulses, error signal pulse lengths or spaces are compared with desired maximum permissible values of pulse or space length of error pulse train; in case any of them exceeds desired value, DC load and reactive-power source are switched off. EFFECT: improved reliability of induction generator and its output voltage regulation. 6 dwg