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In recent years, many telecom operators suffered a profits recession because of the rise of over-the-top (OTT) services, especially text messaging and voice calls. To avoid becoming dumb pipes, telecom operators have to launch diverse digital services to transform their networks from dumb pipes to smart ones. Introducing Software-Defined Networking (SDN) into telecom networks may boost the network...
The increased popularity of over-the-top (OTT) services such as voice calls and text messaging popular has a great impact on the business of traditional telecom operations. It is important for a telecommunications company to maximize resource utilization so as to decrease OPEX/CAPEX (Operating Expense/Capital Expenditure). On the other hand, the deployment of a variety of digital services for broadband...
With the development of intelligent power and electricity market and the change of load characteristic, to construct global energy interconnection and improve the effect of demand response project, this paper mainly discussed the cluster analysis of electrical behavior of users and the selection of target users of demand response project in smart grid. Firstly this paper set up multi-genre classification...
In conventional power systems, client-server architecture and centralized control are adopted for data acquisition and supervisory control, and the speed of message transmission and the fault responses is slow. In contrast, various types of distributed energy resources (DERs) with different characteristics and of different capacities exist in a microgrid system, and client-server architecture and...
A novel active appearance model (AAM) search algorithm based on partial least squares (PLS) regression is proposed. PLS models the relationship between independent (texture residuals) and dependent (error in the model parameters) variables in the training phase by extracting from independent and dependent variables a set of orthogonal factors called latent variables respectively which have the maximum...
Along with the widespread development of Internet and mobile applications, the demand for more flexible and dynamic networking services increases. It becomes a new challenge for many carriers to deploy a variety of new services by effective provisioning of network resources. Software-Defined Networking (SDN) is a novel approach to make networks reconfigurable and extensible such that new services...
The on-orbit demonstration technology is explored and studied for a space-biology nanosatellite, which is being developed by Nanjing University of Science and Technology and Fujian Academy of Agricultural Sciences to monitor the growth and metabolism of Azolla. Firstly, the space biology related experiments performed by NASA using CubeSats are reviewed. Then, the objective of the space biology experiment...
With the rapid increase in the level of industrial automation, computers are widely used in industrial fields of industrial automation, and the design of the master system becomes more and more important. According to the topological structure of passive dynamic harmonic filter, the master system is designed. The touch screen and MCGS configuration software are used by the master system. The tasks...
A remote monitoring system of smoke images is implemented by the GPRS communications and embedded technology. Some respects of the system are described in details such as the overall framework structure of the system, the hardware configurations, the embedded terminal software platform and the programs developed for both the terminals and the server. With this system, the smoke images of scattered...
The uni-directional Cu with surface covered by (111) plane can be made by electroplating. The shape of Cu grain was columnar. The diameters of these columnar grains were 2 – 5 µm. After electroplating SnAg2.3 on the Cu pad and then reflowed at 260 oC, the ?-Cu6Sn5s have shown a preferential growth relationship on the uni-directional Cu. At the early stage of reflowing, the orientations of Cu6Sn5 were...
It is well known that single-phase PWM rectifiers suffer from second-order ripple power and subsequent dc-link voltage pulsation. To reduce this low frequency fluctuation of dc-link voltage as well as to obtain the sinusoidal grid current with unity power factor, a modified single-phase H-bridge PWM rectifier consisting of a conventional H-bridge rectifier and a pure passive auxiliary circuit is presented...
This paper presents the preliminary implementation of microgrid system with photovoltaic and microturbine for stand alone operation. The microgrid test bed of the Institute of Nuclear Energy Research (INER) in Taiwan is selected for the study of impacts of high concentration photovoltaic (HCPV) and microturbine to be installed. The one line diagram of the microgrid is constructed and actual load profile...
Partial discharge detection in UHF band is more effective because it detects electromagnetic wave with high S/N ratio. We used external sensor on GIS tank in order to detect partial discharge signals. External sensor is used to detect leaked EM wave signals from insulation spacer of GIS tank. In this paper, we conduct experiment in 66 kV GIS model with metal type (MT) spacer and leaked EM wave will...
Partial discharge detection in ultra high frequency band (300 MHz to several GHz) is one of the effective methods for diagnosing the insulation condition of a gas insulated switchgear. This method which detect electromagnetic wave with high S/N ratio has been rapidly developed in recent years. We need to install an internal sensor or an external sensor on GIS tank in order to detect partial discharge...
For the partial discharge (PD) measurement of cable circuit only detecting a PD signal is insufficiency, determining the PD location is the real goal, since the purpose of PD measurement is to evaluate the PD correctly and support the maintenance of the cable reasonably. For cable circuit the PD location, the distance between PD sensor and PD source is a very important factor directly affecting the...
Partial discharge detection is the most effective method to monitor and diagnose the insulation condition of high voltage apparatus. UHF method becomes more popular because of its higher S/N ratio. UHF sensors are the most important part of UHF method PD measurement. This paper deals with the PD measurement using several UHF sensors installed on 66 kV GIS model with needle protrusion on the conductor...
In order to solve the contradiction between the rapid pulse charging demand of EV and the grid power change rate limits, it is necessary to add an energy storage buffer system to the smart charging station, which can alleviate the adverse influence on the grid during the fast charging process of EVs. Firstly, the topology structure of EV smart charging station with an energy storage buffer system...
The article gives an overview of the linear state space modeling of the Aero-engine; uses the scheme of central difference to solve the partial derivative equation of certain a turbofan engine establishing a little bias state space model. And the simulation between the nonlinear model and the above-mentioned model step responses indicate the state space model is so closed to the nonlinear model. In...
Cloud computing will play an essential role in smart power grid by providing a cost-efficient, scalable IT platform for the delivery and management of electricity. A key component in the cloud-based smart power grid is the intelligent electronic devices (IEDs), which monitor, control, and protect the power system, and collect data back into the cloud for analysis and management. To maintain proper...
In order to make more profound comprehension of propagation characteristics for E-M signals from partial discharge in GIS, the GIS models with isolating switch are creation to analysis the E-M wave propagation characteristics using FDTD method. The influences of the isolating switch and difference receive degree on the propagation characteristics of E-M wave with comparison of isolating switch close...
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