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In this paper, exponential stability of switched positive linear systems (SPLSs) composed of all unstable modes is first investigated. Through minimum dwell time and fast average dwell time (ADT) approach, sufficient conditions of exponential stability of SPLSs without stable subsystems are derived. The main idea is to utilize the decrement of energy functions caused by switching to compensate the...
Energy Internet is studied as a promising electricity-centered energy network, which revolves around reliable framework, widely interconnected, highly intelligent and open interaction. In this paper, we propose the system structure of energy switch and the mainly function of energy switch. And then a optimization model of energy management in microgrid based on energy switch was built. The optimization...
In order to solve the problems about frequency fluctuation, power allocation between AC and DC sub-microgrid, and operation switching between island and grid-connection mode, a synthetically operation control strategy of hybrid AC/DC microgrid is presented in this paper. As the main converter in AC sub-microgrid, the control strategy of the storage converter adopts the voltage control type virtual...
In this paper, the hub motor driven pure electric vehicle as a prototype, side-slip angle and angular velocity as a controlled variable to design a path tracking controller based on adaptive terminal sliding mode. Through the simulation it can be the design of the adaptive control method based on terminal sliding mode can ensure the vehicle driver's action in 1s after completion of rapid response...
In this paper, the vehicle two-degree of freedom suspension model is taken as the system dynamics model to study the semi-active air suspension system. The sky-hook suspension system is selected as the reference model. Based on the error equation of the body motion, a sliding mode controller is designed by using isokinetic approach law. The traditional sliding mode control uses the switching function...
In this paper, a coarse-grained reconfigurable computing unit (RCU) is designed for the heterogeneous multi-core system (HMCS) which is applied to high density computing field. As a data-driving computing unit, RCU can work in two modes: stream-mode and store-mode. In first, it achieves a higher efficiency, while in latter it attains a better flexibility. The architecture of RCU is optimized for some...
A hybrid distributed generation system (HDGS) using a multi-input multi-output positive buck-boost converter (MIMO-PBBC) is proposed for the supply-side of the grid-connected photovoltaic (PV) generation power plant, where three PV clusters, one battery bank, and one supercapacitor module are hybridized and regulated by a centralized three-phase dc-ac inverter with their corresponding control systems...
In this summary, the resistive random access memory (RRAM) with the structure of Pt/HfO2/Ti is investigated for applications in radiation circumstance. The heavy ion 86Kr26+ of HIRFL (The Heavy Ion Research Facility in Lanzhou) is used as the radiation source. The energy of 86Kr26+ is 25 MeV/u, the LET is 37.6 MeV/(cm2/mg), and the fluence of 5e11 is achieved after 2 hours radiation. Basic performance...
This paper proposes a parallel-connected system where two three-phase three-level T-Type photovoltaic inverters with common ac and dc sides to improve the power rating. However, zero-sequence circulating currents (ZSCCs) will occur, which will distort currents, decrease efficiency, and increase loss. In this paper, the fundamental mechanism of ZSCCs based on the derived model of ZSCCs is analyzed...
This paper studies discrete nonlinear switched systems with uncertain parameters and time-varying delays, the new robust stability criterion is provided in the form of linear matrix inequality based on Lyapunov stability theory, the systems uncertainties were disposed by matrix inequality technique, the new sliding mode surface without time delay term is designed, the robust sliding mode controller...
3D many-core NoCs are emerging architectures for future high-performance single chips due to its integration of many processor cores and memories by stacking multiple layers. In such architecture, because processor cores and memories reside in different locations (center, corner, edge, etc.), memory accesses behave differently due to their different communication distances, and the performance (latency)...
We proposed a new statistical evaluation method to justify the microstructure evolution process of conductive filament (CF) in the reset operation of resistive switching memory (RRAM) according to the dependence of the Weibull slope of reset parameters on the CF size. We demonstrated that in Cu/HfO2/Pt device the CF can be controlled to be ruptured abruptly, which is more advantageous to the reliable...
The variation of switching parameters in RRAM is impacted by the resistance states through a statistical analysis. We proposed some improved program/erase (P/E) methods to precisely control the fluctuation of the resistance states. In DC P/E operation, combing current-sweep-induced gradual SET and voltage-sweep-induced gradual RESET, uniform resistance states can be achieved. In pulse P/E operation,...
In this paper, the problem of sliding mode control of a discrete-time switched system with uncertain parameters and time-varying delay is investigated. By using the average dwell time approach and the piecewise Lyapunov function technique, a sufficient condition is proposed to guarantee the exponential stability of the switched systems with uncertain parameters and time delays. The conservation of...
The privacy problem becomes the biggest obstacle when applying the RFID technology to personal customers usage in Internet of Things. Privacy protection is in the cost of computational overhead and feasibility loss, and necessary for privacy-sensitive usages. We propose a RFID system in which the privacy protection can be turned on or off by validate authorities. The privacy-mode switching increases...
The control schemes of the VSI system have been studied worldwide for many years. However, most of the linear control methods can only achieve parts of the performance requirements. This paper presents a novel control strategy that combines a multiple-resonant sliding-mode controller (MRSMC) with a variable-band hysteretic modulator for a three-phase grid-connected voltage source inverter (VSI) with...
This paper presents a new electrolytic capacitorless and single-stage controlled three-phase battery charger with electrical isolation to provide wide-range output voltage for EV applications. To achieve this, a three-phase rectifier cascaded by a current-feed isolated converter is proposed to yield DC voltage output and eliminate the bulk electrolytic capacitor installed behind the rectifier. Therefore,...
This paper proposed a novel control scheme for rectifier in 3-level neutral-point-clamped (NPC) converter for propulsion of high speed maglev train. In rectifier, the voltage and current are regulated by closed-loop in d-q reference frame. The fluctuation of neutral-point voltage is analyzed, and a new SVPWM modulation strategy is presented to make the NP voltage balance. The performance of rectifier...
As one strategy of power management, microgrid has the special superiorities on not only improving power quality but also relieving the pressure on energy and environment. To carry out experiment and research, a small laboratory-scale microgrid system with energy storage device, single phase and three-phase photovoltaic devices and wind power devices are planned to build. Fault current in the microgrid...
A critical challenge in Cognitive Radio Networks (CRN) is to make decision in real-time on accessing and releasing available channels that maximize the spectrum utilization and the overall system throughput. In this work, we make investigations on optimal action point to explore and exploit the frequency-temporal diversity in addition to spectrum availability. By modeling the Rayleigh fading channel...
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