This paper proposes a distributed digital control architecture of a modular-based solid-state transformer (SST) using a digital signal processor (DSP) and a field-programmable gate array (FPGA). In particular, the thr...
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This paper proposes a distributed digital control architecture of a modular-based solid-state transformer (SST) using a digital signal processor (DSP) and a field-programmable gate array (FPGA). In particular, the three-stage SST based on a modular structure is the topology of most interest because of its superior controllability. In order to make the modular-based SST, the digital implementation is inevitable to achieve higher performances, improved reliability, and an easy development. In addition, the modular-based SST requires enough capacity for implementing complex control algorithms, multiple interfaces, and a large number of internal variables. In this paper, a digitalcontrol platform for the modular-based SST is built using a floating-point DSP and an FPGA that operate cooperatively. As a result, the main control algorithms are performed by the DSP, and the simple logical processes are implemented in the FPGA to synthesize the suitable gating signals and control external devices, respectively. The proposed implementation method enables high-switching-frequency operation, multitasking, and flexible design for the modular-based SST. Experimental results are presented to verify the practical feasibility of the proposed technique for the modular-based SST.
This paper describes the development of a desktop robotic system that enables the plug-and-play function through the USB (universal serial bus) port of a personal computer (PC). Thus a new kind of desktop PC periphera...
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This paper describes the development of a desktop robotic system that enables the plug-and-play function through the USB (universal serial bus) port of a personal computer (PC). Thus a new kind of desktop PC peripheral is invented that has programmable manipulability. The robotic system is realized on an internally distributedcontrol structure that facilitates higher system reliability. A PID control algorithm is implemented on a prototype of the proposed system, to demonstrate the system's ability to implement feedback control. Experimental results show the performance and properties of the proposed system.
This thesis proposes a novel approach to power electronics system design that is based on the open-architecture distributed digital controller and modular power electronics building blocks (PEBBs). The proposed distr...
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This thesis proposes a novel approach to power electronics system design that is based on the open-architecture distributed digital controller and modular power electronics building blocks (PEBBs). The proposed distributed digital controller partitions the controller in three levels of control authority. The power stage controller, designated as hardware manager, is responsible for low-level hardware oriented tasks; the high level controller, designated as applications manager, performs higher-level application-oriented tasks; and the system level controller handles system control and monitoring functions.
Communications between the hardware-oriented controller and the higher-level controller are implemented with the previously proposed 125 Mbits/sec daisy-chained fiber optic communication protocol. Real-time control and status data are communicated by means of communication protocol. The distributedcontroller on the power converter level makes the system open, flexible and simple to use. Furthermore, this work gives an overview and comparison of current state-of-the-art communication protocols for real-time control applications with emphasis on industrial automation and motion control. All of the studied protocols have been considered as local area networks (LAN) for system-level control in power converter systems. The most promising solution has been chosen for the system level communication protocol.
This thesis also provides the details of design and implementation of the distributedcontroller. The design of both the hardware and software components are explained. A 100 kVA three-phase voltage source inverter (VSI) prototype was built and tested using the distributedcontroller approach to demonstrate the feasibility of the proposed concept.
A view, rough sketch and outlines for the development of CIM in a typical chemical complex are presented. Drastic improvement on the productivity of the complex is foreseen by this development in its existing faciliti...
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A view, rough sketch and outlines for the development of CIM in a typical chemical complex are presented. Drastic improvement on the productivity of the complex is foreseen by this development in its existing facilities. Key objectives are increased productivity of the physical plants through provision of information and tools to the people who manage and operate the plants by means of a centralized plant control system and the consistent production of quality products in an efficient manner that is responsive to the external environment through the integrating and automating of the information processing activities. At the initial stage there should be depicted the future image and models of the restructured complex with CIM implementation. The stepwise development toward final goal is followed. Although the development of CIM in the existing facilities is a greater challenge than in new facilities, necessitating more sophisticated technologies within existing constraints, efforts should be payed for a future goal of the CIM world.
distributed digital control is a reality. And this paper addresses what the author perceives as the most important practical considerations in designing and implementing distributed digital control systems. In order t...
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distributed digital control is a reality. And this paper addresses what the author perceives as the most important practical considerations in designing and implementing distributed digital control systems. In order to put the discussion in proper perspective, a brief introduction/background is presented along with a graphic definition of what constitutes distributed digital control. The body of the paper deals with: the human engineering aspects, e.g., operator's interface, control room design and utilization; equipment questions such as reliability, failure modes and their effects, and remote installation; operations considerations regarding backup for controls and displays; and systems issues, e.g., communication links, system security, and the distribution of control functions. Finally, the potential advantages and disadvantages of distributed digital control compared to centralized control are considered in practical terms.
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