1,721,082 research outputs found
Influence of Battery Aging on the Operation of a Charging Infrastructure
No full textThe increasingly widespread use of electric vehicles requires proper planning of the charging infrastructure. In addition to the correct identification of the optimal positions, this concerns the accurate sizing of the charging station with respect to energy needs and the management of power flows. In particular, if we consider the presence of a renewable energy source and a storage system, we can identify strategies to maximize the use of renewable energy, minimizing the purchase costs from the grid. This study uses real charging data for some public stations, which include “normal” chargers (3 kW and 7 kW) and “quick” ones (43 kW and 55 kW), for the optimal sizing of a photovoltaic system with stationary storage. Battery degradation due to use is included in the evaluation of the overall running costs of the station. In this study, two different cost models for battery degradation and their influence on energy flow management are compared, along with their impact on battery life
A SPACE VECTOR MODULATION ALGORITHM FOR TORQUE CONTROL OF INVERTER FED INDUCTION MOTOR DRIVE
No full textAfter a short review of the vectorial torque control (VTC) strategy, the design and setup of a dedicated modulation hardware unit is described in detail. Experimental comparisons with traditional induction motor control techniques fully confirm the validity of the proposed system
FIELED ORIENTED CONTROL OF INDUCTION MOTOR BY MEANS OF H CONTROLLER
No full textIn the paper, the H∞ control theory is used in order to design a state feedback controller for field oriented speed control of an induction motor. In particular, the problem of finding an optimal H∞ controller has been considered. The performances of the proposed controller are numerically analyzed and experimentally verified. The results confirm that good dynamic performances and high robustness to variations of a system's parameter can be achieve
ADHESION-RECOVERY CONTROL FOR ELECTRICAL TRACTION DRIVES
No full textThe Vectorial Torque Control algorithm is applied in order to impose the re-adhesion trajectory in an induction motor drive for traction purposes. It allows to achieve a very strong anti-skidding action assuring, at the same time, low stress for the mechanical parts. The efficacy of the proposed control strategy has been validated by an experiment. Several skid effects have been achieved by means of an high dynamic performance hysteresis brake assembled on the controlled motor shaft, which allows to impose any load torque profile. The results obtained by the experiment fully confirm the validity of the proposed control strategy
Maximum Torque Per Watt (MTPW) field-oriented control of induction motor
No full textA new field-oriented control strategy for induction motor is proposed in the paper. It is called Maximum Torque Per Watt (MTPW) and allows obtaining the minimum value of the sum of the stator and rotor losses due to joule effect, and of the iron losses, for a given value of the reference torque and of the motor speed. Iron losses have been modeled according to Steinmetz equation, separating hysteresis and eddy currents and taking into account the dependence both on the frequency and on the peak value of the flux density. Numerical and experimental results are presented to confirm the validity of the proposed approach, which allows achieving significant improvements in the efficiency of induction motor drive
Power Control for Fuel-Cell–Supercapacitor Traction Drive
No full textThis paper presents a fuel cell (FC)–supercapacitor traction drive and its power control. The proposed solution allows increasing efficiency and performances of an FC-based powertrain by means of a dual cascaded voltage source inverter and a supercapacitor bank. An optimal control algorithm allows avoiding the fast transition of the FC output power under whatever operating condition. It is based on five operation modes, which are selected as a function of the actual traction power request. This way, both power peaks and slopes are controlled during vehicle accelerations. A supercapacitor charge stabilization strategy, which uses the same cascaded converter power circuit, is also proposed. Experimental implementation has been performed for validation
A novel approach to speed and parameters estimation in induction motor drives
No full textWith reference to speed controlled induction motor drives, an algorithm that allows the online estimation either of the speed and one motor parameter or, alternatively, of two motor parameters, is presented in the paper. The results obtained by simulation fully confirm the validity of the proposed algorithm. At last, the problems arising from the implementation of the proposed algorithm on a DSP-based control hardware are analyzed
An Algorithm for Speed and Parameter Estimation in uP Speed Controlled Induction Motor Drives
No full textVoltage Vectorial Control of an Induction Motor Drive
No full textThe paper describes a vectorial control strategy for induction motor fed by VSI which allows to exploit the dynamic performances by taking into account both the rotor and stator time constant, and avoiding at the same time the use of current control loop. It is based on the step-by-step evaluation of the feeding voltage of the motor, in such a way as to achieve the imposed space vector of the stator current, corresponding to the reference values of the electromagnetic torque and flux. The strategy has been implemented on fully DSP-based control architecture for speed control of an induction motor drive. Experimental results are presented and compared with the ones obtained with an hysteresis current control loop. They show a very good behaviour of the system, both in dynamic and steady-state operating conditions
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