Browsing by Keyword "SVM"
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Item Advanced shifting control of a two speed gearbox for an electric vehicle(Korean Society of Automotive Engineers, 2015) Allende, M.; Prieto, P.; Hériz, B.; Cubert, J. M.; Gassman, T.; Tecnalia Research & Innovation; POWERTRAINThe apparition of electric vehicles on the market generates new challenges. Within them, one of the most important is related to the vehicle autonomy. In this paper an advanced shifting control system for a two speed gearbox is presented. It combines driving conditions and driving style inference techniques in conjunction with an expert decision control system for selecting the most suitable gear for energy saving. The expert control system is offline-tuned using a set of pre-specified simulation trips which characterize different scenarios. These pre-specific trips are recognized in real time to apply the expert control rules. The strategy is combined with an automatic shifting sequence with speed synchronization which reduces shifting times and torque transitions. Compared to a single-geared vehicle, an energy saving up to 10% can be achieved keeping the driver sensations while driving. An ad-hoc HIL mechatronic test bed has been developed for the complete system testing purposes.Item Multilevel converters: Topologies, modulation and control(Institution of Engineering and Technology, 2016-01-01) Pou, Josep; Ceballos, Salvador; Konstantinou, Georgios; POWER ELECTRONICS AND SYSTEM EQUIPMENTThis chapter has introduced the main multilevel converter topologies, i.e. the DCC, the FC, and the CHB converters, as well as the MMC, which is a recent topology that is expected to be widely applied in HVDC transmission systems. After classifying the modulation techniques, the basics of SVM and CB-PWM for multilevel converters have been presented. In the case of SVM, a modulation algorithm prone to be implemented in a digital processor has been applied to the three-level DCC (or NPC converter) and described in detail. A capacitor voltage balancing strategy based on selecting proper redundant vectors has also been embedded in the modulation. In the case of implementing a CB-PWM, several carrier signals are required for multilevel converters. Different carrier dispositions have been shown, including PS-PWM and LS-PWM. CB-PWM is especially interesting for modular converter topologies, such as the CHB converter and the MMC.