QUALITY POWER FROM INDUCTION GENERATOR FEEDING VARIABLE SPEED MOTORS

摘要

A prime mover ( 28 ) in a heat recovery system drives an induction generator ( 8 ) which feeds power to a utility grid ( 9 ) through a breaker ( 10 ) but also powers a load including auxiliary induction motors ( 11, 12 ). To provide acceptable waveform and power factor, the auxiliary equipment is driven through IGBT switched bridge converters ( 13 ) by DC voltage ( 15 ) generated by an IGBT switched bridge converter ( 13 a), instead of three-phase diode rectifiers ( 16 ). The switched bridge converter controller ( 14 a) is responsive to a system process controller ( 23 a) which causes the switched bridge controller ( 13 a) to be driven in response to the voltage ( 26 ) and current ( 27 ) on the generator bus ( 17 ). This eliminates the need for harmonic filters ( 18 ) and power factor capacitors ( 20 ) while improving the quality of the power generated. The controller ( 23 a) trips the breaker if the voltage, frequency or power factor is out of limits.