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An asymmetrical hybrid-controlled half-bridge LCC resonant converter which integrated a buck–boost converter and a half-bridge LCC resonant converter is proposed. It benefits with wide soft switching range, low conduction loss and high power density. By utilising an asymmetrical hybrid control strategy, its switching frequency and duty ratio can be adjusted simultaneously. The proposed LCC resonant...
Variable frequency controlled LCC resonant converter suffers from wide variation of switching frequency. Although fixed frequency controlled LCC resonant converter benefits from constant switching frequency, it suffers from narrow zero voltage switching (ZVS) range of power switch and high circulating energy. A pulse width modulation - pulse frequency modulation (PWM-PFM) hybrid controlled LCC resonant...
Reasonable maintenance for power transformer is critical to the long-term security operation of transformer. At present, the lack of support theory for transformer maintenance decision usually causes reliability and economy issues for power companies, which may cause "over maintenance" or "owing maintenance" problems. For this reason, a probabilistic maintenance scheme evaluation...
The paper proposes the method of building the electric power marketing business application system based on the cloud computing and microservices architecture technologies to solve the issues of the current system with the concentrated infrastructure and the monolithic architecture which are difficult to support the business processing in very large scale and the evolution of the electric power marketing...
We design a single photon avalanche diode (SPAD) in a standard 180-nm CMOS technology. The SPAD consists of a P+/n-well junction with octagon shape, a p-well guard-ring and a ploy guard-ring. The two rings prevent SPAD from premature edge breakdown events and STI interface trap influence, respectively. The measurement results show that a typical dark count rate of SPAD is 8 kHz at room temperature...
Characteristic of switching impulse discharge plays an important role during the external insulation design of transmission and transformation project. For the determination of calculation method of switching impulse discharge strength, this paper introduces a new elasticity coefficient mathematical model based on the test research of rod-plane air gaps under 50% standard switching impulse voltage...
Corona performance of hardware fittings is an important consideration in the design and operation of high voltage transmission lines. As the major critical suppression component, the corona discharge characteristics of dampers is directly related to the energy saving and environment protection effect. Simulation by finite element method were discussed to calculate the electric field distribution and...
A practical way to capture images and estimate their spectral reflectance was proposed. For the image acquisition, a four-channel digital camera was used. Then the reflectance is represented as a linear combination of several basis vectors by singular value decomposition (SVD). After that, a neural network is trained so that it is able to approximate the relationship between the camera responses and...
From the perspective of knowledge exchange and sharing, this paper researches on the Knowledge Network System Building and Realization. Firstly, it describes the whole framework of Knowledge Network System, builds the mode of Knowledge Network System flow according to current software technology. Secondly, this paper establishes the mode of Knowledge Network System function and introduces them respectively...
AC/DC hybrid is a kind of structure forms of micro grid, to supply AC load and DC load. In order to realize the uniform distribution of DC power between AC converters, improve the DC bus voltage quality; this paper introduces a hierarchical AC converter control strategy. The first layer is the DC voltage-active power droop control method to realize the uniform load distribution; considering that droop...
A novel printed compact triple-band antenna for WLAN/WiMAX applications is proposed in this paper. Due to the coupling between the 'comb' shape parasitic element and the multi-branch radiating element, three frequency bands which are suitable for WLAN/WiMAX are achieved. The simulated results show that by adding the parasitic element, the high frequency end cutoff frequency of the antenna is reduced...
As advanced products of cloud computing, cloud storage service provide a well platform for enterprise management. However, on one hand, enterprises must consider many factors such as the cost when they choose cloud storage service. On the other hand, enterprises lack an intuitive understanding and grasp to the non-functional properties existing in cloud storage service. In the paper, it shows the...
The purity of output spectrum of high power microwave vacuum electronic devices is very important for the microwave electronic system. The stray outputs with frequency in or near the operating frequency band have been observed in some Multi-Beam Klystron(MBK). The exits of the stray outputs have serious influence on the normal operation of the microwave electronic systems. The variation of stray outputs...
Multi-instance model has been employed in image retrieval for its excellent performance to deal with the ambiguities in an image. However, many multi-instance learning methods such as Diverse Density and so on cannot meet the requirement of real-time and the retrieval accuracy, so need to be improved. This paper selects instances from regions to words to make the regions full of semantics and become...
Accurate queue estimation of traffic congestion at recurrent freeway bottlenecks is an important part of developing effective traffic control strategies. Two traffic flow analytical techniques are always employed in studying queuing processes: shockwave analysis and input-output analysis. These two techniques have been taken as separate tools for estimating queue length (size) in a number of studies...
Freeway congestion is highly recognized as a worldwide traffic problem since traffic demand has grown steadily over the past decades. Active traffic and demand management (ATDM) methods, including Ramp Metering (RM), Variable Speed Limit (VSL), and Route Guidance (RG), can help delay or even avoid congestion. Currently, those measures have become predictive and integrated based on real-time data collection...
Interruptible load management is an important component of demand side management in electricity market. It has deep influences on the reliable and economical operation of power system. Interruptible load management aims at enhancing the elasticity of users to relieve or eliminate the strain on peak load hours. The electricity power company should to sign a contract in advance with the user, appointing...
The paper analyzed the regional Industry-University-Research cooperative technological innovation system from external dynamic to the inner dynamic and then analyzed the interaction of external dynamic and internal dynamic by using the dynamical analysis method. According to the specific conditions of the dynamic elements, it combined with the dynamics method, and constructed the elements relation...
One of the most difficult components for multi-class classification system is to find an appropriate error-correcting output codes (ECOC) matrix, which is used to decompose the multi-class problem into several binary class problems. In this paper, an indicator based multi-objective evolutionary algorithm with preference involved is designed to search the high-quality ECOC matrix. Specifically, the...
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