Modelling and simulation of a vector controlled synchronous generator supplying a DC energy distribution line coupled to the AC grid

The paper deals with the energy flow control of a DC distribution-line connected by means of power-electronic converters to an autonomous synchronous generator, to the public AC-grid and consumers like PWM-inverter-fed AC-drives. The generator vector-control structure is realized according to the stator-field orientation principle and it operates with unity power factor. As the generator actuator a DC-to-DC chopper is feeding the exciting winding, another one couples the current-source DC link of the armature-side rectifier to the voltage-source DC-line. Each full-wave rectifier and inverter is equipped with PWM voltage-source inverter for active-filtering of the AC line- and SG-side currents. The static converters are modeled similar to the quadripole theory. Simulations were performed in MATLAB/Simulinkreg environment for the generator - based on the ldquomotorrdquo model - operating with reversed energy conversion. There are presented the generator starting, energy-consuming and also energy-recovery operation of the DC-line during the regenerative braking of the AC drives.