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A novel method of synchronized pulsewidth modulation (PWM) has been disseminated for control of dual neutral-point-clamped inverters feeding asymmetrical dual three-phase (six-phase) motor drive with two DC sources. Control algorithms provide in this case elimination of alternating common-mode voltages both in each inverter and in the load. Phase voltages of the drive system are characterised by quarter-wave...
Novel method (methodology) of synchronized pulsewidth modulation (PWM) is powerful instrumentation for elimination of sub-harmonics in the spectra of output voltage of both three-phase and multiphase voltage source inverters. This paper presents examples of dissemination of this new method for control of: a) five-phase inverters; b) six-phase inverters for drive system with symmetrical six-phase induction...
The paper presents analysis of operation of dual three-phase (six-phase) power conversion systems, controlled in accordance with combination of continuous and discontinuous schemes of synchronized pulsewidth modulation (PWM). Topology of six-phase drive includes six-phase inverter feeding asymmetrical six-phase machine which is characterized by two sets of three-phase windings that are spatially shifted...
Analysis of operation of the six-phase (dual three-phase) drives with basic schemes of synchronized pulsewidth modulation (PWM) in the zone of overmodulation has been performed. Control of six-phase drives is based on the 30deg-phase-shifting between signals of two standard inverters, supplied from a single DC voltage source. Algorithms of synchronized PWM provide continuous synchronization of the...
Novel method of synchronized pulse width modulation (PWM) has been disseminated for control of cascaded neutral-point-clamped inverters feeding open-end winding induction motor drive with single dc voltage source. Control algorithms provide in this case full elimination of the common-mode voltages both in each inverter and in the load. Phase voltages of the drive system are characterised by quarter-wave...
The paper describes operation of cascaded (modular) converters with synchronous pulsewidth modulation (PWM), mainly for control regimes different from conventional volts/hertz control. Modular multilevel converter consists from three standard three-phase inverter modules along with an 0.33 p.u. output transformer. The proposed PWM method provides synchronisation of the voltage waveforms of each module...
Novel method of direct synchronised pulsewidth modulation is applied for control of a dual inverter-fed open-end winding induction motor drive with separate DC-link sources with different voltages. New strategy and algorithms of synchronised pulsewidth modulation (PWM) provide quarter-wave symmetry of multilevel actual phase voltage of the system during the whole control range including the zone of...
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