Microprocessor Control for Two Magnetically Coupled Three-Phase PWM Inverters

The requirements on the control set for two PWM inverters coupled by a three-phase harmonic canceling reactor are described, and its method of operation, based on a microprocessor Intel 8086 is explained. The input information is a reference space vector (rsv), which represents the required motor voltages. It is shown how the six respective inverter-output potentials can be calculated in a very short time based on this reference vector. One free running mode for low frequencies and special pulse sequences which are synchronized with the stator frequency are realized.