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This paper presents the results of research and simulation of feature automated control of a hysteretic object and the difference between automated control and automatic control. The main feature of automatic control is in the fact that the control loop contains human being as a regulator with its limited response speed. The human reaction can be described as integrating link. The hysteretic object...
The paper deals with theoretical and practical prerequisites for the systems-on-chip design intended for measurement, processing and output of different kinds of heterogeneous signals. Some problems concerning the basic structure and architecture of these heterogeneous SOCs are investigated, as well as their possible application areas, features and preferences of the used heterogeneous components...
In this paper we present concepts for synergy of switched fuzzy and fuzzy-neural systems. First, an algorithm/procedure for neural network identification of switched fuzzy models, out of input-output data pairs is given. In order to use the existing stability and stabilization results in the field of switched fuzzy systems to the identified switched fuzzy-neural models, an extension of the switched...
The paper presents a tool to transform Simulink models into UML models. The embedded control software design process can be divided into the control logic design phase and the software design phase. MATLAB/Simulink is widely used to build a controller model in the control logic design phase. On the other hand, UML is widely used in the software design phase. We have developed a model transformation...
The simulation of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Various simulations, varying the torque and current tolerances, are carried out in the low torque and high torque range. Simulation results show a direct influence...
The application of a direct torque hysteresis controller (DTHC) driving an interior permanent magnet synchronous machine (IPMSM) in the dynamic state is presented in this paper. The underlying switching concept as well as a proposed experimental setup is discussed. Positive and negative torque setpoint steps are simulated in the low torque and high torque range. Simulation results show that the number...
A predictive control strategy applied to a matrix converter based induction machine drive is presented in this paper. The strategy features the advantages of the direct torque control (DTC) and the predictive control, verifying its robustness throughout its behavior analysis under an unbalanced AC supply. The predictive control approach is based on the model of the converter-machine system. Such model...
The mining sector is a vital contributor to the economy of South Africa. This sector, however, consumes 15% of the country's electrical energy. Deep mine operations require ventilation and cooling (VC) systems, which can account for up to 25% of the mine's electricity cost.
This paper presents a Guidance, Navigation and Control (GNC) system for the autonomous landing of a Remotely Piloted Aircraft Helicopter (RPAS) in a GPS-denied scenario by using a tether in the landing. A new control and sensor fusion strategy has been designed for landing accurately by means of relative position and velocity commands. The system uses on-board the RPAS a device with a cardan joint...
In this paper, a direct torque hysteresis controller (DTHC) driving a permanent magnet synchronous machine is discussed. A two-level, three-phase conventional inverter is used as means of power conversion. Advantages such as a low switching frequency as well as further opportunities of the DTHC are specified. The simulation results show a high degree of potential for the DTHC in future applications.
The system is based on the characteristics of microgrid and energy storage power plant control system, combined with engineering practice, providing monitoring for the island-based independent power supply systems, science parks, research institutes, laboratories microgrid, energy storage power stations, control, protection and energy management integration solutions. For system integration process,...
Multiple-input converter (MIC), which has higher efficiency, less component count, lower cost and simpler control method, is a promising candidate for energy harvesting in hybrid systems, and for power distribution in micro and nano grids. The principle of the proposed advanced-timesharing switching (ATSS) strategy is that the effective duty ratio of each switch is an integer multiple of a common...
This paper reviews the progress over the past decade in improving the reliability of MEMS capacitive switches. The emphasis is on mitigating the dielectric-charging problem as it currently limits the lifetime of these switches. The most critical is to distinguish charging of the dielectric surface from that of the dielectric bulk, and then mitigate them separately. Once surface charging is eliminated...
Failure Modes and Effects analysis (FMEA) is a widely used technique for inductive safety analysis. FMEA provides engineers with valuable information about failure modes of system components as well as procedures for error detection and recovery. In this paper we propose an approach that facilitates representation of FMEA results in formal Event-B specifications of control systems. We define a umber...
This paper presents a multi-channel Digital Programmable Delay Trigger System (DPDTS) with high accuracy and wide delay range, which can be widely used in laser system and electron accelerator. This DPDTS mainly makes up of reference clock module, user interface and control module and Digital Programmable Delay Trigger (DPDT) module which is implemented on a Xilinx V6LX75T FPGA. In this DPDTS, DDS...
A simple current sharing control technique for the switching power supply is presented herein, which is based on the concept of the differential-mode transformer. This current-sharing structure is very simple as well as makes the efficiency relatively high at light load, and this is quite suitable for industrial applications with standby power considered. In addition, a synchronously-rectified (SR)...
Power saving technology for the Internet has become a vital issue because of the growing energy consumption, caused by the increasing traffic demand. Thus, we have proposed a scheme to dynamically control the transmission capacity between switches in order to reduce the power consumption on the basis of the change in traffic volume. In this paper, the transmission capacity is better estimated by taking...
This paper proposes safety function in control laws to reduce the frequency of events that a physical value in a control system deviates from its normal operating-range. This safety function is realized mainly by the safety ability to suppress the fluctuations of transient responses after a device failure in order to prevent the deviations from the normal operating-range on the basis of dependability...
To construct energy optimal Internet, a new traffic engineering concept aggregating traffic into specific links and dynamically powering off interfaces of routers/switches should be introduced. This paper proposes a network topology design algorithm and examines link power management.
Distributed power systems are getting more attention now-a-days due to their high flexibility and reliability. In this paper, predictive current control strategy is proposed for the grid-connected four-leg inverters. This kind of converter is developed to deliver power to the unbalanced/nonlinear three-phase loads and as well to the grid. The discrete-time model of the converter and load is used to...
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