Interleaved converter legs are typically modulated with individual carriers per leg and phase-shifted PWM (PS-PWM) as it facilitates current balancing amongst the legs. Phase-disposition PWM (PD-PWM), despite the better harmonic performance, cannot be directly used due to the resulting current imbalance that may damage the converter. This paper addresses the current sharing issue and proposes a single-carrier PD-PWM technique for multiple leg two-level converters based on a hierarchy scheme derived from current sorting algorithms. An extension of the proposed algorithm through a switching state feedback loop, limiting the average switching frequency, is also developed. In both cases, the load current is shared amongst the legs and the high-quality of the output voltages and currents is maintained while the circulating currents amongst the converter legs are kept to a minimum. Simulation results demonstrate the method for multiple interleaved legs as well as its current sharing capabilities for high-power applications. Experimental results from a low-power laboratory prototype validate the operation of the proposed approach. ; Peer Reviewed ; Postprint (published version)
Single-carrier phase-disposition PWM techniques for multiple interleaved voltage-source converter legs
2017-10-26
Article (Journal)
Electronic Resource
English
Interleaving , Locomoció , Electric inductors , Convertidors de corrent elèctric , Electric current converters , voltage source converters , Anàlisi harmònica , Inductors , Sorting , Inductors elèctrics , multilevel converters , Power system harmonics , Harmonic analysis , Legged locomotion , parallel legs , Locomotion , multilevel waveforms , Pulse width modulation , Switches , Àrees temàtiques de la UPC::Enginyeria elèctrica
Enhanced phase-shifted PWM carrier disposition for interleaved voltage-source inverters
BASE | 2014
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