A new carrier-based PWM providing common-mode-current reduction and DC-bus balancing for three-level inverters
IEEE Transactions on Industrial Electronics, 2007•ieeexplore.ieee.org
Adjustable-speed drives involve common-mode voltages, which generate common-mode
currents flowing to the ground through stray capacitances of electric machines. These
currents are known to provoke premature motor-bearing failures, as well as electromagnetic
interferences disturbing neighbor electronic devices. Furthermore, high-voltage applications
involve high levels of these conducted emissions, which must be lowered by using bulky
and expensive filters. This paper aims at elaborating a new pulsewidth-modulation (PWM) …
currents flowing to the ground through stray capacitances of electric machines. These
currents are known to provoke premature motor-bearing failures, as well as electromagnetic
interferences disturbing neighbor electronic devices. Furthermore, high-voltage applications
involve high levels of these conducted emissions, which must be lowered by using bulky
and expensive filters. This paper aims at elaborating a new pulsewidth-modulation (PWM) …
Adjustable-speed drives involve common-mode voltages, which generate common-mode currents flowing to the ground through stray capacitances of electric machines. These currents are known to provoke premature motor-bearing failures, as well as electromagnetic interferences disturbing neighbor electronic devices. Furthermore, high-voltage applications involve high levels of these conducted emissions, which must be lowered by using bulky and expensive filters. This paper aims at elaborating a new pulsewidth-modulation (PWM) strategy in order to reduce the common-mode currents generated by three-level neutral-point-clamped inverters. The proposed strategy also provides the ability to balance the neutral point of the dc-bus capacitors. Experimental results both in time and frequency domains confirm that the new PWM improves the electromagnetic-compatibility behavior of the drive compared with conventional strategies.
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