Browsing by Keyword "DC/DC converter"
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Item Active Control of Variable DC-Link for Maximum Efficiency of Traction Motor Drives(2023-07-01) Pescetto, Paolo; Sierra-Gonzalez, Andres; Alvarez-Gonzalez, Fernando; Kapeller, Hansjorg; Trancho, Elena; Pellegrino, Gianmario; POWERTRAIN; Tecnalia Research & InnovationModern electric vehicles often interpose a DC/DC converter between traction battery and inverter, boosting the supply voltage of the drive. The power losses in the two converters and in the electric motor significantly vary with the DC-link voltage amplitude. In this work, a novel control algorithm is proposed to adapt online the DC-link voltage during vehicle operation, pursuing the maximum efficiency of the DC/DC converter and traction inverter without affecting the motor control dynamic. The key principle of the proposal, suitable for 3-phase and multi-three-phase drives, relies on the DC-link voltage minimization on varying the drive operating conditions. Among its advantages, the proposed variable DC-link control is independent of the motor parameters, the adopted torque/speed control strategy and the number of 3-phase sets of the drive. Although originally developed for electric vehicles, it can be adopted in a wide number of applications. Straightforward calibration roles are also provided. The proposed algorithm is deeply validated in simulation and experiments using a full-scale 135 kW 6-phase traction motor drive at TRL6.Item Variable DC-link Control Strategy for Maximum Efficiency of Traction Motor Drives(Institute of Electrical and Electronics Engineers Inc., 2021) Pescetto, Paolo; Sierra-Gonzalez, Andres; Trancho, Elena; Pellegrino, Gianmario; POWERTRAINThis work proposes an optimized control strategy for online adapting the DC-link voltage in a traction motor drive. In the considered vehicle architecture, a DC/DC converter boosts the battery voltage (rated 400 V) to a controlled DC-link, which feeds the traction inverter. The amplitude of the DC-link is online varied depending on the drive speed and torque conditions to minimize the power losses in the DC/DC converter and in the traction inverter. The switching losses in both the converters are reduced by minimizing the DC-link voltage without affecting the motor control performance. The proposed DC-link adaptation technique is almost independent of the motor parameters and adopted torque/speed control strategy, therefore it can be adopted in a wide number of applications. Moreover, it requires minimal calibration effort.