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This paper presents a probabilistic interval optimization (PIO) model for evaluating the problem of optimal power flow considering wind power integrated (OPFWP). In PIO model, the wind power is deemed as a probability interval variable to assess its profit and risk simultaneously. To be precise, the profit is manifested by the net decrease of generation cost between the same power system with and...
Gallium Nitride (GaN) transistors are especially attractive in their capability of switching at high frequencies, and enable power conversion systems with reduced size and higher efficiency. However, owing to the low threshold voltage of the commercially available enhancement-mode (E-mode) GaN devices, the devices are more prone to false turn-on phenomenon, leading to larger switching losses, circuit...
This paper investigates the rejection of wind disturbances of an Unmanned Aerial Vehicle (UAV). UAVs are used for increasingly complex operations that require a great deal of accuracy and minimal position changes. This calls for better disturbance rejection. The drag-inclusive dynamics of a quadcopter are derived and used to create two uniaxial wind disturbance rejection controllers: a disturbance...
Study of Unmanned Aerial Vehicle (UAV) has been focused on military and special mission requirements. Flying such machines in populated urban environment has not been investigated. In this study, the risks of using UAVs to deliver goods to customers has been analysed. Based on the operating constraints and commercial reality, the delivery system is designed and simulated using a complex spatial simulation...
Indium doping of Cz and CCz mono-crystalline silicon has been investigated as a means to reduce lifetime degradation after light soaking in wafers and cells. The lifetime degradation is due to the formation of a metastable boron-oxygen complex (B-O pairs) during incipient carrier injection and is proposed to be the mechanism responsible for light-induced degradation in p-type solar cells doped with...
Spindles, key components of a spinning frame, are also the symbol of textile industry. Its dynamic performance directly affects the quality and yield of yarn [1]. At present, the spindle, up to 25000 rpm, belongs to high speed of rotors. In the process of work, it has to face the vibration problem, which is the main reason that spindle cannot speed up and broken yarn.
This paper proposes a new approach for detecting and isolating faults in a non-linear dynamic process using the multiple model approach. The necessary conditions for the assignability of eigenvalues to a region in the s-plane and the necessary conditions to guarantee the stability of fuzzy models for Takagi-Sugeno (T-S) fuzzy observers are derived. The paper is structured in two stages. The first...
In this paper, studying the problem of hypersonic ballistic missile attacking large moving target on the sea and considering the motion characteristic of the target, we focus on the passive tracking subject of height-measurable missile. In terminal guidance of hypersonic ballistic missile, measurement noise of LOS (line-of-sight) angle which is provided by infrared seeker is large due to aerodynamic...
According to the theory of constraints (TOC), bottleneck should be made full use while non-bottleneck should be subordinate to the bottleneck. However, for the multi-bottleneck permutation flow-shop scheduling problem (PFSP), different bottleneck causes different driving force resulting in different even conflicted scheduling solution. Aiming at this problem, the multi-objective mathematical model...
In this paper, we present a measurement preprocessing-based state estimation algorithm for maneuvering target tracking. The preprocessing scheme on received measurements is employed to reduce the covariance of measurement errors. This can be achieved by using a maximum likelihood method for yielding target's estimated accelerations and velocities which result in preprocessed measurements. Preprocessed...
Traditional linearity testing of ADCs involves using a spectrally pure or a highly linear stimulus, along with a large number of samples per code to average out the effects of noise. Test equipments need to house expensive instruments to provide the highly linear stimulus. The large number of samples required for the procedure results in long test times. These two factors are prime contributors to...
By analyzing the current development situation of open computer numerical control (CNC) system, architecture /component software technology and mechatronics coupling design theory, this paper research on a structuring methodology based on these technologies. The conception of composability CNC and structuring method system hardware are represented in this paper. Then a mathematical model of interfaces...
Node localization becomes an exciting research area for recently large emergence of ZigBee based wireless applications, where received signal strength indication is adopted as a coarse but simple method on range measurement. Compared with the centralized approach, distributed algorithm that nodes locally calculate their own position coordinates can significantly reduce location-related network traffic;...
Past research has indicated that the effectiveness and efficiency of traffic control of signalized intersections strongly depend on the accurate calculation of saturation flow rate, particularly when demand approaches capacity. Minimal work has been done in the past on calibration of the parameters for saturation flow rate used in traffic control of signalized intersections. This paper discusses a...
With a large number of traffic parameters data, it is an important issue that how to set up an efficient model of classification and prediction to identify the congestion state as soon as possible. The article provided a model of predicting traffic congestion based on the learn vector quantization neural network by making use of traffic parameters such as speed, volume and occupancy which were detected...
The mass rapid transit system is essential both to rational utilization of the economical resource and optimization of overall arrangement of urban land use. Choice models diffusely used in China now are largely based on the certain values which fall short of the practice. In this passage, grey numbers are used to estimate the practical situation and the set pair analysis is introduced to determine...
Parallel prefix adders draw much attention because of their logarithmic delay. This paper proposes a scheme to enhance parallel prefix adders by incorporating the idea of carry-save addition within the prefix tree. Results are given for several designs using a publicly available nanometer library.
This paper describes the protection scheme implemented on an autotransformer electrification system on the West Coast main line of network rail in the UK. The design is significantly different from autotransformer systems used in continental Europe and the channel tunnel rail link because it uses greater selectivity isolating the faulted line while leaving remaining lines energised. This is important...
The Doubly Fed Induction Generator (DFIG) with back-to-back four-quadrant converters between its rotor winding and the grid can realize the maximal wind energy capture in variable-speed wind energy generation system. Based on the stator flux-oriented excitation vector control strategy, this paper presents that the system dynamic characteristics under speed-mode control are superior to the dynamic...
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