This paper proposed a novel predictive variable-structure-switching-based current controller for a three-phase load driven by a power inverter. The design specifications are robustness to load electrical parameters, fast dynamic response, reduced switching frequency, and simple hardware implementation. In order to meet previous specifications, a sliding mode controller has been developed, which is designed as finite-state automata, and implemented with a field-programmable gate array (FPGA) device. The switching strategy implemented within the state transition diagram provides for a minimum number of switches by the three-phase inverter that is confirmed through simulation and experimental results. Its regulation using the proposed control law provides good transient response by the brushless ac motor control. However, this does not limit the wider applicability of the proposed controller that is suitable for different types of ac loads (rectifier and inverter) and ac motors (induction, synchronous, and reluctance). A new logical FPGA torque and speed controller is developed, analyzed, and experimentally verified.
COBISS.SI-ID: 16608790
This paper proposes a FPGA-based Sliding Mode Controller for scaled bilateral teleoperation. The control algorithm is derived by using the sliding mode control based design approach. The applied design procedure replaces a discontinuous control with a continuous one. Thus, it guarantees chattering-free performance whilst retaining practical robustness regarding disturbances, and provides easy model-free implementation. A high control rateis strongly required in order to achieve high-performance scaled bilateral teleoperation. Hence, the control algorithm is implemented by the FPGA. In order to design a sufficient logic circuit for the FPGA, general optimization approaches are presented that aim to minimize hardware resources, and to optimize the control rate. The design applies high-level programming language (LabVIEW) for rapid prototyping. The presented algorithms were validated by the 2- DoF laboratory bilateral teleoperation system.
COBISS.SI-ID: 16563990
The early concept of the World Wide Web was the network of related (linked) documents represented in human readable form. The ongoing development leads toanother aspect of the web, the web of data. The goal being that the network will provide first-class, machine readable data. Therefore the current networkwill be transformed to a network where the machines will not only serveas the platform that hosts human readable data but as a true machine-machine network. In this paper, we review and compare the formats, technologies and approaches that are used today for publishing semantic, machine readable data, on the web.
COBISS.SI-ID: 17041686
An already published current control strategy for the coupled-inductor buck–boost converter is able to change its aim from controlling the input current to controlling the output current, and vice versa, depending on the instantaneous operation point and the applied current references. The main drawback of the two PI-based control implementation is its slow response when the control aim is changed from one current to the other. Due to the magnetic coupling, the converter’s control-to-input and control-to-output current small signal transfer functions exhibit similar first-order characteristics. Therefore, it is possible to transform the previous control scheme to a PI-based one that exhibits faster and, in certain cases, much faster transitions between input and output current control operation. The presented experiments also show that the steady-state behavior of the converter is unaffected by the new control implementation.
COBISS.SI-ID: 16608534
This paper proposes the field-programmable gate array (FPGA) implementation ofa variable structure system predictive sequential switching control strategy, as applied to a permanent magnet synchronous machine. In the case ofac motor drives, in contrast to conventional vector control where the inverter is not taken into consideration by the controller, the proposed control integrates the inverter model and the inverter states. It allows obtaining faster torque dynamics than vector control algorithms. The main design specifications are a reduced switching frequency and simple hardware implementation. A predictive sliding mode controller has been developed, designed as finite-state machine, and implemented with a FPGA. This new logic FPGA torque and speed controller has been developed, analyzed, and experimentally verified.
COBISS.SI-ID: 16609302