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Based on complex network load flow considering the UHV components and the corona loss, a theoretical method for loss assessment and prediction of UHV AC power system. is provided. Firstly, the line losses under different operation conditions are theoretically analysed and compared between the UHV AC system and typical 500kV systems. Theoretical analysis shows that the line loss ratio of the 1000kV...
This paper presents a new high-efficiency micro-inverter. The topology consists of a high-efficiency LLC resonant converter and a traditional full-bridge inverter employing a new soft switching technique. The inverter stage works with one leg operating in high frequency and the other leg in line frequency. Both switches in high frequency leg are able to achieve ZVS without adding any components by...
It is of vital importance to develop a high accuracy and fast convergence algorithm in deep sea navigation system, since location is essential for the sake of scientific survey and safety in very hazard environment. Unscented Kalman Filter (UKF) is the type of filter, which is designed in order to overrun this problem. However, in case of state estimation of the Human Occupied Vehicle (HOV) via the...
Dead Reckoning (DR) and Long Base Line (LBL) are a modern method in navigation of Human Occupied Vehicles (HOV). However, the accuracy of DR system would degrade sharply, and due to the obvious error drifts of each unit involved in DR. LBL has the disadvantage of low update frequency. To improve the heading estimation of DR/LBL, this paper proposes an innovative method which could adjust state error...
This paper presents a novel work that how to determine the memory (initialization function) of fractional order systems by using the recent sampled input-output data. The background and basic theories of initialized fractional order systems are introduced. A practical algorithm is proposed to estimate the initial value of initialization function, which is adaptive to all system parameters. A P-type...
We proposed a dual-band S-shaped fractal antenna with a compact orthogonal dipole for miniaturization and a reflection mirror for gain improvement. Considering the applications of vehicular navigation systems, the proposed antenna is designed to cover dual-band frequencies of L-Band (1.616 GHz ± 5 MHz) and S-Band (2.492 GHz ± 5 MHz). The −10 dB impedance bandwidths are 238 MHz and 340 MHz respectively...
Logic built-in self-test (LBIST) is commonly used for testing integrated circuits (ICs) in production and in the field. Due to the random nature of LBIST patterns, activation of random-pattern-resistant faults requires the application of numerous patterns, thus increasing test time in the field. In this work, we introduce a novel method to reduce LBIST pattern count and LBIST test time. The presented...
In deep lunar soil sampling, the drilling mechanism is driven by the loading wire rope through a driving mechanism. This paper is aimed at establishing an accurate dynamic model of the removable loading wire rope and analyzing its influence on the drilling process. In the process of drilling, there exists material transportation at the boundaries, so the length and mass of the upper and lower wire...
Inertial navigation sets a very stringent requirement on the long-term stability of an accelerometer, which is characterized by bias instability. Long-term stability demands a very low-noise design. Accelerometers based on capacitance sensing are the mainstream MEMS accelerometers reported recently [1-3]. The state-of-the-art achieves 1μg bias instability and 2μg/Hz1/2 resolution with a full scale...
Short-term load forecasting refers to daily and weekly load forecasting, which plays a vital role in ensuring security and high quality of power system's economic operation for power generation planning. In short-term load forecasting, load periodicity with the fixed regularity is generally analyzed and random factors like weather are taken into consideration to improve the accuracy of the forecast,...
This paper presents an approach to coordinated planning of distribution network (DN) and distributed generation (DG) considering uncertainties of output of DG and load. To overcome shortage of traditional separated planning of DN with DG and maximize positive influence brought by DGs, the multi-objective integrated planning model of DN and DG is established, in which the types, location, capacity...
Issues related to Wireless Sensor Networks (WSNs) are inseparable part of concerns in Big Data, due to they can provide a large amount of real-time data to the processing units. A service-oriented wireless sensor network aims to manage the procedure for data-provision by considering the term "service" as a user-specified requirement. In another words, it provides a user-friendly interface...
An important property of electromagnetic fields which is partly responsible for the interaction between fields and chiral medium is called optical chirality. By enhancing this field property while maintaining constant input power, we are able to increase absorption of circularly polarized light by chiral molecules of a certain handedness. This enhancement is achieved through the use of plasmonic nano-particles...
For the current problems of resent ultrasonic machining driver, for example, output power is single and power regulation is not precise. This paper presents a new type of ultrasonic machining driver based on BUCK DC chopper. The new type of ultrasonic machining driver consists of STM32F106, DDS waveform generating circuit, signal processing circuit and the most important circuit which is BUCK DC chopper...
This paper presents a new target tracking method. The presented method which named marginalized cubature Kalman filter is based on standard cubature Kalman filter and marginalized moment estimator. The marginalized moment estimator uses sigma-points sampling and Guass-Hermite integration to estimate the mean and covariance. The proposed algorithm which is called MCKF in short, uses marginalized moment...
This paper uses a new nonlinear Kalman filter algorithm in maneuvering target tracking. Marginalized KalmanFilter (MKF) algorithm expresses the system's nonlinear measurement equation as weighted sum of Hermite polynomials, then models the prior distribution of the weighted matrix as a Gaussian process. After that, calculates the weighted matrix's posteriori distribution and removes the influence...
Ensuring aircraft stay safely separated is the primary consideration in air traffic control. To achieve the required level of assurance for this safety-critical application, the Automated Airspace Concept (AAC) proposes a network of components providing multiple levels of separation assurance, including conflict detection and resolution. In our previous work, we conducted a formal study of this concept...
Natural language in the maintenance data of high speed railway system is the big challenge for the fault diagnosis due to its unstructual feature and uncertainty semantics. In this paper, a text mining based fault diagnosis method for vehicle on-board equipment (VOBE) of high speed railway has been proposed, in which, the topic model is used to extract the fault feature from the maintenance records...
There is multi voltage levels including UHV and complex operation for wide-area power transmission for future power grid. The voltage regulation and reactive power compensation are more dependent on the cooperation of devices and methods in each voltage levels including UHV, EHV and lower voltage level. Reasonable configuration can save cost and improve operation efficiency. The configuration principle...
There may be SPD from many manufacturers on the same line. One SPD is installed by the contractor in charge of electrical installation and then various panel boards are used in the installation made by various panel builders. All of them may use a different brand of SPDs. A solution would be to perform the coordination tests proposed by the European CLC TS 61643-12 standard. A preliminary paper was...
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