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In order to enhance the tracking performance of maneuvering target by forgetting factor RLS algorithm, an improved forgetting factor adaptive function is proposed based on cosine function. This adaptive function can adjust the forgetting factor dynamically according to the tracking error. In addition, a comprehensive predictor is designed, which dynamically selects the linear predictor or the square...
Ethernet plays an important role in the layer 2 network. Unfortunately, the tremendous Address Resolution Protocol (ARP) broadcast traffic among massive hosts limits the scale of Ethernet. Recently, Software-Defined Network (SDN) has been proposed to suppress broadcast traffic by centralized control. However, existing approaches based on SDN suffer from an adaptability limitation as they cannot independently...
This paper presents thermal characteristics of rotor-side converter (RSC) in doubly-fed induction generator (DFIG) wind turbines (WTs). A numerical power loss and thermal model simulator has been developed to obtain instantaneous junction temperature of power devices for a wide operating range of RSCs. Thermal performance of four RSC candidates, including Si IGBT based 2L / 3L-NPC / 3L-ANPC RSCs and...
In order to accurately predict the working temperature of isolation switch contact, the 110kV isolation switch for substation in Wufeng country of Zhaotong City, Yunnan province is regarded as the research object. The working temperature of isolation switch contact for passive wireless sensor acquisition is regarded as measured value, using linear neural network and BP neural network to respectively...
An improved genetic algorithm based on fuzzy inference theory is proposed in this paper, which is applied in faulty location of distribution network. This algorithm improves the problem of faulty operation caused by the distorted signal transmission in traditional faulty location method and the problem of premature convergence and slow convergence speed of standard genetic algorithm. Firstly, a mathematical...
Real-time simulation technique of power systems is becoming realizable due to the growing significant computational power of computing platform. This paper builds a real-time prototypical platform based on PXI and LabVIEW as its main hardware and software architecture. Taking advantage of the integration characteristics of NI products, the platform embodies high expansibility and good compatibility...
This paper proposed the fault tolerant topologies (FTTs) of five-level active neutral-point-clamped (5L-ANPC) converters. In the proposed approaches, the traditional 5L-ANPC converters are modified by adding a low count of low-cost components and are operated with the proposed control and modulation schemes. Simulation results show that the proposed 5L-ANPC FTTs can achieve fault tolerant operation...
This paper investigates the coupled-group consensus problem of second-order multi-agent systems subjected to communication delay, and we adopt a linear synchronously-coupled consensus protocol under the assumption that the sum of each agent's adjacent weights to the agents in the other sub-group is zero in the interconnection topology. Based on Lyapunov-Krasovskii functional, delay-dependent sufficient...
This paper demonstrates a dual path LC voltage controlled oscillator (VCO) that achieves ~65% tuning range with optimized inductor switching design. Combination of discrete and continuous tuning method reduces the gain ratio between coarse tuning path and fine tuning path which alleviates the noise and coupling issues due to high coarse tuning gain. Optimized inductor switching topology enables wideband...
In high bandwidth and low latency data center networks, when multiple data senders simultaneously communicate with a single receiver, namely in many-to-one communication pattern, it is frequently occurred that the burst data overload the receiver's switch buffers, which leads to TCP throughput collapse. This phenomenon is termed to TCP Incast problem, which has become a new hot research topic in recent...
This paper proposes a new control scheme of five-level active NPC (5L-ANPC) converters for common mode voltage (CMV) mitigation in medium voltage (MV) drives. By properly synchronizing and selecting the voltage vectors of active frond-end rectifier and motor-side inverter, the peak level of CMV at motor terminals can be effectively reduced, which is required for explosion proof (EX) applications....
Path load balancing is used for distributing workload across an array of paths to increase network reliability and optimize link utilization. However, it is not easy to realize the load balancing globally in traditional networks as the whole status of the network is difficult to obtain. To address this problem, we propose the Fuzzy Synthetic Evaluation Mechanism (FSEM), a path load balancing solution...
In this paper, the operation characteristics of five-level active-neutral-point-clamped (5L-ANPC) inverters under device short failure conditions are analyzed. A new fault tolerant control scheme is proposed, which enables continuous operation and generating three-phase sinusoidal currents of 5L-ANPC inverters. The remaining redundant voltage vectors can still be utilized to improve operating performance...
As inter-domain routing on today's Internet does not and basically cannot consider traffic load when determining best traffic forwarding paths, it is not always optimal for a router to forward packets along its default path, especially when the router's default output port incurs a long queuing delay. In this paper, we design a new approach called TED in which border routers of autonomous systems...
Loongson is a family of general purpose processors based on MIPS architecture designed and manufactured in Mainland China. With the maturity of Loongson CPUs, applications are widely available with the increasing development of software tools and hardware platforms by research teams in academia and industry. In recent years, products based on Loongson have been mainly used in education, personal computers...
The emerging cloud computing is developing into a new enable technology for service integration, making essential conditions for the appearance of public clouds, which integrate external services and provide services to third-party users. In contrary with traditional application integration, the service integrated in public clouds has to deal with a larger scale user accesses and monitor the execution...
Network security has become an increasingly important yet challenging issue in present production networks. State-of-the-art solutions cannot meet the overall requirements of high-efficiency security, due to the complicated configuration demands, heavy network traffic and ever-increasing network scale. In this paper, we present Live Sec, a scalable and flexible security management architecture, which...
In this paper, we propose a dispatching strategy with charging plans upon the client requests for a commercial fleet of pure electric taxis. To boost the green industry, promoting the development of electrical vehicles is one of the most important policies of many governments. In a new scenario that the commercial taxi fleets run electrical vehicles as the main transportation, traditional dispatching...
In this paper, we have designed a Multi-Frequency Scaling scheme for energy conservation of network devices, especially routers and switches. The frequency of components in a network device is scaled dynamically according to the real time workload. A Markov model is developed for performance analysis of this mechanism. We implement a prototype of this scheme in the data path of a general IPv4 router...
Limited natural energy resources compel humankind to search for efficient utilization of energy, and thus increasing number of fluorescent lamps are adopted for lighting systems. However, previous study showed that there exists a tradeoff between energy-saving and lifespan for fluorescent lamps. Consequently, it becomes an important topic on how to design an efficient and effective automatic control...
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