{A high-performance three-phase DC-voltage source-an application to a welding machine}

Title{A high-performance three-phase DC-voltage source-an application to a welding machine}
Publication TypeConference Paper
Year of Publication2001
AuthorsSalo M, Tuusa H, Nyqvist J
Conference NameApplied Power Electronics Conference and Exposition, 2001. APEC 2001. Sixteenth Annual IEEE
ISBN NumberVO - 2
KeywordsAC-DC power convertors, Control systems, Current measurement, Current supplies, electric welding, EMC regulations, Filters, front-end converter unit, high-performance three-phase DC-voltage source, LC filter resonance damping, power electronic systems, power electronics, power supplies to apparatus, Pulse width modulation, Pulse width modulation converters, PWM power convertors, quadrature axis components, Reactive power, reactive power compensation, Reactive power control, Rectifiers, rectifying circuits, single-chip Motorola MC68HC916Y1 microcontroller, supply filter, synchronously rotating reference frame, three-phase current-source PWM rectifiers, Voltage control, welding machine application
AbstractThree-phase current-source PWM rectifiers are becoming increasingly popular as the front-end converter unit in power electronic systems due to tighter EMC regulations. In this paper, the three-phase current-type DC-voltage source with reactive power control is introduced. The control system is realized in the synchronously rotating reference frame, where the active (the DC-link voltage) and reactive power can be independently and very simply controlled with the quadrature axis components of the supply current. Also, the control system includes simple methods to compensate the reactive power drawn by the supply filter and to damp the LC filter resonance. The control methods are realized without supply current measurements, which enables the elimination of the line side current sensors since the supply current measurements are not needed either for protection in the current source converters. The proposed control system is realized using a single-chip Motorola MC68HC916Y1 microcontroller. The prototype has been tested with both a resistor and a welding machine connected to the DC-link