Abstract
The paper deals with a single-leg direct (matrix) converter with minimum switching devices and enhancements for improving current THD and phase advancing with the use of variable (switched) capacitors. This converter supplies single-phase induction motor (SPIM). Due to strongly non-harmonic phase voltages, an additional circuit should be used, so that phase-currents can be nearly harmonic. Simulations are done under both resistive-inductive load and motoric load. Speed control was realized using vector control with current controlled pulse-width-modulation (hysteresis regulator). Verification of such a drive system was done using dSpace environment. Preliminary results are given in the paper.
Highlights
The Single-phase induction motor - single-phase induction motor (SPIM) is widely used in a range of applications such as residential blowers, pumps, and compressors operated under fixed frequency
Single-phase induction motor was fed by voltage as above, and the simulation result of both phase currents and common phase current are depicted in Figure and Figure are nearly harmonic ones
Speed control of single-phase induction motor fed by single leg matrix converter (MxC), including start-up, was realized by the setting of requested angular speed to 50 rad/sec, after start-up 100 rad/sec, and 150, 200 and 250 rad/sec, respectively
Summary
The Single-phase induction motor - SPIM is widely used in a range of applications such as residential blowers, pumps, and compressors operated under fixed frequency. 2.1 Topology of a single leg MxC fed single phase induction motor for full speed operation. As in the single leg, VSI using MxC is necessary to sense phase of AC voltage source and ensure 90° phase shift for auxiliary phase. 2.2 Topology of a single leg MXC fed single phase induction motor to reduce the speed operation. The problem, maybe, could be regarding a higher voltage of the resonant capacitor and/or bigger dimensions of the filter element due to relatively smaller resonant frequency Another possibility is to use the non-resonant low-pass filter on the output of the converter. As regarding to phase currents, are similar to those of resonant filter, Figure 7 and Figure 8 Another problem is that under variable frequency the value of both capacitors, for phase shift and for resonance, should be variable one. There is shown acting of switching capacitance for controlled phase shift 90 deg., in Figure 9 and Figure 10
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Communications - Scientific letters of the University of Zilina
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
