The use of electric vehicles (EVs) is expected to extensively expand worldwide in the near future. Therefore, an insistent need for efficient fully integrated on-board battery chargers has become ...urgent to minimize the vehicle cost leading the charging process to be publicly available. This paper considers on-board battery charging of EVs using a nine-phase system which are completely integrated in both propulsion and charging operational modes. The charging mode is employed with zero machine average torque production, while a unity power factor operation at the grid side can be concurrently achieved. All the propulsion components are utilized in the charging process; no new elements are, therefore, demanded. Moreover, hardware reconfiguration to transfer from propulsion to charging is not needed. Therefore, the electric vehicle supply equipment (EVSE) known as off-board charger infrastructure is expensed with. To this endeavor, this paper presents a design case study for a 1.5kW integrated on-board battery charger using a nine-phase induction machine, as a part of a senior project for electrical engineering undergraduate students. Both mathematical modeling and MATLAB/Simulink simulation results are given. The vehicle to grid (V2G) and propulsion regimes are experimentally verified.
In applications where motors are fed from low voltage variable-frequency drive (VFD) through long cables, a step up transformer is commonly used to boost the converter output voltage in order to ...compensate for the cable voltage drop. For safety-critical applications, employing a multiphase machine generally enhances system reliability, however, a multiphase converter and transformer will be then needed. This paper proposes a simple drive system using a four-switch based five-phase drive system for motors fed through long cables. The system simply comprises a four-switch converter, which is controlled to produce a balanced two-phase output, and a static transformer that converts the two-phase inverter output voltage to five-phase balanced voltages. The proposed system is simulated using MATLAB/SIMULINK to verify the proposed concept.
The multimotor drives supplied from reduced switch-count converter topologies are potentially employed in different applications such as EVs/HEVs and traction systems. Much research work has been ...done to investigate the feasibility of different series/parallel-motor connections in an appropriate manner while being supplied by a single Voltage Source Inverter (VSI). In this paper, a new Fifteen-Switch Inverter (15-SI) topology for supplying two independent five-phase motors is proposed. This topology can be considered as an extension to the well-known nine-switch converter topology, which can be used to independently control two three-phase motor drives. First, the proposed inverter topology and its mathematical model are presented. Then, three carrier-based Pulse Width Modulation (PWM) schemes to control the converter and their operational constraints are investigated under Common Frequency (CF) and Variable Frequency (VF) modes of operation. The proposed system is validated by simulating the proposed 15-SI feeding two identical five-phase induction motors using Matlab/Simulink.
Conventionally, tapping-off a small amount of power from an HVDC transmission line to a three-phase local network can be achieved using a DC-to-AC voltage source converter (VSC) followed by a step ...down transformer. In order to obtain the high-voltage ratings required in the HVDC systems, semiconductor devices should be connected in series. Hence, careful design to ensure dynamic voltage sharing between switches is necessary. In this paper, DC-AC multi-module VSCs (series-input parallel-output) along with an input-voltage balancing technique are employed as an alternative solution. The advantages of the proposed architecture against conventional system are also highlighted. A Simulation study is carried out to show the effectiveness of the proposed architecture and to validate the proposed voltage balancing technique.
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