TY  - Journal Article
AU  - Fernandez, Markel
AU  - Sierra-Gonzalez, Andres
AU  - Robles, Endika
AU  - Kortabarria, Iñigo
AU  - Ibarra, Edorta
AU  - Martin, Jose Luis
TI  - New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives
PY  - 2020
PB  - Multidisciplinary Digital Publishing Institute (MDPI)
AB  - Star-connected multiphase AC drives are being considered for electromovility applications such as electromechanical actuators (EMA), where high power density and fault tolerance is demanded. As for three-phase systems, common-mode voltage (CMV) is an issue for multiphase drives. CMV leads to shaft voltages between rotor and stator windings, generating bearing currents which accelerate bearing degradation and produce high electromagnetic interferences (EMI). CMV effects can be mitigated by using appropriate modulation techniques. Thus, this work proposes a new Hybrid PWM algorithm that effectively reduces CMV in five-phase AC electric drives, improving their reliability. All the mathematical background required to understand the proposal, i.e., vector transformations, vector sequences and calculation of analytical expressions for duty cycle determination are detailed. Additionally, practical details that simplify the implementation of the proposal in an FPGA are also included. This technique, HAZSL5M5-PWM, extends the linear range of the AZSL5M5-PWM modulation, providing a full linear range. Simulation results obtained in an accurate multiphase EMA model are provided, showing the validity of the proposed modulation approach.
SN  - 1996-1073
UR  - http://hdl.handle.net/11556/882
DX  - 10.3390/en13030607
ER  -