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Virtual radio space control system is the necessary tendency to spacecraft control Spacecraft control system based on Virtual radio is different from trandkional software radio in the data paralleled transmission and time synchronization. Dynamic time-division multiplexing transmission mode is presented by analyzing the data paralleled and synchronous transmission. The problem caused by traditional...
Bit-stream based control technique uses a uniformly weighted single bit streams to control a system and is a new approach for controller design. This method is ideally suited for field programmable gate array (FPGA) or application specific integrated circuit (ASIC) implementation and offers numerous advantages due to its inherent parallel nature. The present paper proposes the design of bit-stream...
A Wireless Networked Control Systems review is presented. It begins with a brief history about NCS (Networked Control Systems), recognizing the fundamental features, its advantages over other classical control systems, and the protocols that can be used to do control over the wireless network. Also, we deal with the different problems that can affect the network behavior; including interferences and...
This paper introduces a platform for real time simulation and its contribution towards smart grid related research, with focus on Plug-in Hybrid Electric Vehicles (PHEV) charging stations. The current system is able to simulate in real time key elements of a smart grid such as: high speed power electronics, distributed energy resources (DER), and communication networks. A description of the platform...
With the rapid development and implementation of Internet technologies, well-designed/tuned controllers obtained from control design without network are desired, which can be further realized in remote control systems directly. Theoretically, available networked control system (NCS) designs are developed with a known system model and time delay. However, the nature of network-induced delay is unpredictable,...
Locomotive synchronization operation and control(LSOC) system is a train control system based on LOCOTROL technique and GSM for railway (GSM-R) system for heavy haul railway. The current QoS requirements of GSM-R are designed for train control message transmission (TCMT) service of ETCS, which are not suitable for LSOC service with different characteristic. Therefore, the reasonable QoS requirement...
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...
This paper presents a two-gain Iterative Learning Control (ILC) design for nonlinear discrete systems with time delays in state. The convergence of the proposed ILC rule with sufficient condition is derived based on a kind of two-dimensional (2-D) linear inequalities. The proposed ILC rule is able to guarantee convergence of the learning process against fixed iterative initial errors. An example is...
The Internet time-delay tests testify that the time-delay between two random nodes accords with Shift Gamma distribution, which comes to the conclusion that the kinds of the Shift Gamma distribution are limited. Moreover, each kind distribution corresponds to one time-delay on average. Through the method of fitting the sample probability density curve to estimate the parameters of the Shift Gamma...
This paper deals with the output stabilization of time-delay systems with sector-bounded nonlinearity and disturbance. In this paper we will consider the problem of absolute stability for a class of time-delay systems which can be represented as a feedback connection of a linear dynamical system with unknown parameters and a uncertain nonlinearity satisfying a sector constraint. For a class of output...
In this paper we address the problem of efficient control of periodic-review perishable inventory systems. In the considered systems the stock used to fulfill unknown, variable demand deteriorates exponentially, and is replenished with delay from several supply sources. The supply options are characterized by different lead times, spanning multiple review periods. We develop a new supply policy based...
Wireless power transfer technique can be used in many applications nowadays. The main limitation of this wireless power transfer system is in their interface circuitry. In this paper, a highly efficient active rectifier is proposed. By adopting the high speed comparator and, proposed rectifier solved the turn on and off delay of power transistor problem of conventional rectifier and shows high power...
In this paper we present a bandwidth optimization scheduling method based on CAN (Controller Area Network) network. We construct a CAN network structure that contains a BOM (Bandwidth Optimize Manager), which is used to limit the bandwidth occupancy rate of part of control sub-systems, and implement dynamically allocation for network bandwidth resources in the CAN control system. By comparing the...
Due to the introduction of the Internet, enabling the network control system to introduce a delay. Mainly aiming at the fixed delay and the stability of system, this article puts forward the generalized predictive control (GPC) algorithm, and establish a prediction model on the basis of using the ideas of fuzzy control to solve the delay of the network control system. Finally, apply the truetime simulation...
Nowadays flexible power regulation is very important for doubly fed induction generator (DFIG)-based wind turbines to improve power quality and enhance grid stability. This paper proposes an improved predictive direct power control (PDPC) strategy of DFIG to reduce power ripples at low constant switching frequency. Furthermore, the control system is simplified while the robustness of classic direct...
Conditions for the existence of positive stable realizations with system Metzler matrices for proper transfer function are established. A method based on the decomposition of transfer functions into the first, second and third orders transfer functions for computation of positive stable realizations is proposed. A method for computation of positive stable realizations of transfer functions with real...
As process technology shrinks, the adaptive leakage power compensation scheme will become more important in realizing high-performance and low-power applications. In order to minimize total active power consumption in digital circuits, one must take into account sub-threshold leakage currents that grow exponentially as technology scales. This describes to predict how dynamic power and sub-threshold...
Traditional three-dimensional fuzzy controller for over more fuzzy rules is difficultly designed and used, a mixed controller combined Fuzzy control with PID control is proposed in this paper. This strategy uses three one-dimensional fuzzy controllers respectively being deviation, deviation change and deviation's deviation change by weighting fusion for forming the M-type controller. It solves the...
For a sampled-data control system with nonuniform sampling, the sampling interval sequence, which is continuously distributed in a given interval, is described as a multiple independent identically distributed process. The closed-loop system is transformed into an asynchronous dynamical impulse model with input delay. By average dwell-time approach, sufficient conditions for the closed-loop exponential...
With the development of digital substation, the devices of the substation put forward higher demands on clock synchronization. The standard of the IEEE1588 provides a protocol that enables precise synchronization of clocks in measurement and control systems, and the precision of its network is sub-microsecond level which can satisfy the need of clock synchronization of the substation. This paper makes...
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