ANORDNING FOR ALSTRING AV EN UTGANGSVEXELSPENNING BESTAENDE AV EN MED ETT BESTEMT VARVTAL DRIVEN ASYNKRONMASKIN OCH EN TILL ASYNKRONMASKINEN KOPPLAD VEXELRIKTARE

• Main Authors: G H STUDTMANN, H J VENEMA
• Format: Patent
• Language: Swedish
• Published: 07.05.1984
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROL OR REGULATION THEREOF; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

ABSTRACT An induction machine is driven to operate as a generator, and has its electrical output conductors coupled to a switching system, which can be an inverter circuit. An oscillator and logic circuit are connected to regulate the switching of the power switches, such as thyristors, in the inverter circuit which operates as a switching system. The thyristors in the switching system are regulated to switch at a frequency sufficiently below the synchronous frequency of the induction machine to enable the machine to build up and operate as a generator. A modulator is connected to the oscillator to vary the oscillator frequency, and thus change the switching frequency of the switching system, above and below a reference level to provide a corresponding a-c output voltage, with a d-c average level, on the d-c bus conductors of the inverter circuit which operates as the switching system. The amplitude and frequency of the a-c output voltage are controllable over a wide range of variations in both the shaft speed of the induction machine and/or the electrical load. The system is also capable of producing an a-c voltage and a separate d-c voltage, and both the a-c and d-c voltages can be separately controlled.