Modulation Strategies to Reduce Common-Mode Voltage for Indirect Matrix Converters

Common-mode voltage (CMV) is responsible for overvoltage stress to the winding insulation and bearing damage of an ac motor. High dv / dt of CMV raises leakage currents, which can cause serious problems such as motor damage and electromagnetic noise to the equipment installed near the converter. Thi...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2012-01, Vol.59 (1), p.129-140
Main Authors: Nguyen, T. D., Hong-Hee Lee
Format: Article
Language:English
Subjects:
AC/AC converter
common-mode voltage (CMV)
Damage
Design engineering
direct matrix converter (DMC)
Electric potential
indirect matrix converter (IMC)
Inverters
Mathematical analysis
Matrix converters
matrix converters (MCs)
Modulation
Motors
Pulse width modulation
Rectifiers
space vector pulsewidth modulation (SVPWM)
Strategy
Switches
Vectors (mathematics)
Voltage
Voltage control
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Summary:Common-mode voltage (CMV) is responsible for overvoltage stress to the winding insulation and bearing damage of an ac motor. High dv / dt of CMV raises leakage currents, which can cause serious problems such as motor damage and electromagnetic noise to the equipment installed near the converter. This paper proposes two modulation strategies for indirect matrix converters that substantially eliminate CMV. The first method is developed by using the suitable couple of nonzero space vectors instead of zero space vectors in the inverter stage. The maximum voltage transfer ratio of this method is unaffected and remains 0.866. The second one, which is useful for low-voltage operation, is approached by choosing the medium and the lowest positive line-to-line input voltages in the rectifier stage to generate the dc-link voltage and by placing suitable zero space vectors in the inverter stage. In the second method, the maximum voltage transfer ratio is 0.5. Both methods can mitigate the peak value to 42%. In addition, while the first method provides the same performance to the conventional method, the second method can reduce significantly the harmonic components of line-to-line output voltage. Simulation and experimental results are shown to verify the effectiveness of the proposed methods.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2011.2141101