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Real-time simulation of modular multilevel converter (MMC)-based HVDC is one of the most important and difficult technologies in the area of power electronics research. This paper presents a methodology for the hardware in loop (HIL) CPU/FPGA-based real-time simulation of a one-terminal MMC HVDC of up to 468 levels using a detailed equivalent model, and the simulation system is based on full-scale...
This paper provides a theoretical analysis on the classification accuracy of LDA-Bayesian based method with respect to the data sample size in brain connectivity analysis. More specifically, we show that when the sample size increases, both the classification error probability and its upper bound decreases monotonically. However, we also show that due to the model limitation of the Bayesian classifier,...
Electric load simulator (ELS) is a resonant system and has a large coefficient caused by the stiffness of shaft. Its dynamic performance is always limited and stability is hard to be guaranteed. Besides, its external disturbance is the active motion of an actuator, and output is the load torque, which are both different from conventional servo systems. Therefore, the speed controller of ELS needs...
This study presents an optimization control strategy to improve the ride-through capability of voltage source converter-based high voltage direct current (VSC-HVDC) systems under unbalanced network conditions. To facilitate simple implementation and flexible operation, the current references are derived and synthesized into one generalized equation that introduces two individually adaptable parameters...
The emphasis in this paper is mainly on the point estimation of unknown parameters for uncertainty distribution. Firstly, principle of least squares and the least squares estimation are introduced. Secondly, by the k-th empirical moments of the expert's experimental data, we establish a method of moments to estimate the unknown parameters for uncertainty distribution. Finally, a moment estimation...
Online compression of I/O-data streams in general purpose computing will enhance the effective I/O bandwidth of processors, the bandwidth of the computer network as well as the storage capacity and the read/write performance of the storage. In this paper, a self-adaptive dynamic partial reconfigurable architecture for the online compression of data streams is introduced. The proposed architecture...
The present study focuses on the influence of the discharge water from Ocean Thermal Energy Conversion (OTEC) plant of demonstration scales by numerical simulations. MEC-NEST is employed for calculating hydrodynamic processes, and a nested grid system is used to calculate the phenomena near the OTEC plant with finer grid. A lower trophic ecosystem model is embedded on MEC-NEST to analyze behaviors...
Although the e-commerce of agro-food in mainland China started much later than that in America and European Union, the speed and potential of its growing shouldn't be underestimated. In recent years, increasing cyber citizens emerged in mainland China, who'd created huge needs for online transaction for all kinds of commodities ranging from daily commodities to foods to facilitate their daily lives...
In this paper, we investigate the social-based recommendation algorithms on heterogeneous social networks and proposed Hete-CF, a social collaborative filtering algorithm using heterogeneous relations. Distinct from the exiting methods, Hete-CF can effectively utilise multiple types of relations in a heterogeneous social network. More importantly, Hete-CF is a general approach and can be used in arbitrary...
In this paper, turning workpiece surface images were captured by the image acquisition system composed of digital microscopy, high-resolution camera and computer. the 14 texture feature parameters based on gray level co-occurrence matrix (GLCM) were extracted by using the method of statistical analysis, The variation between each texture parameter and arithmetic mean deviation (Ra) was investigated,...
Many key problems of the control system can be effectively reflected by the inverted pendulum system, such as the problem of nonlinear system, robustness, servo system, stabilization and tracking, etc. Any control problem with whose center is above and fulcrum is blow can be approximate into an inverted pendulum model, so the study of inverted pendulum has important practical significance. In this...
In this paper, we present a new contour point distortion measurement, called accurate distortion measurement for B-spline-based shape coding (ADMBSC). Different from existing distortion measurements containing approximation, quantization or parameterization, our distortion is defined as the shortest distance from the original B-spline to the associated contour point. This is in line with the subjective-based...
Direct torque control system of permanent magnet synchronous motor based on second order sliding mode speed controller is introduced to solve the problem that flux linkage and rectangular pulse are both too big in the direct torque control of permanent magnet synchronous motor, it is difficult to control at low speed. This method not only makes the state of system converge in limited time, decreases...
Several parameters influencing the calculation result of bearing capacity are discussed, which indicate bearing capacity coefficient is related to the internal friction angle and length-width ratio of rectangular foundation. Through analyzing ultimate bearing capacity of rectangular foundations using three equations and three theoretical solutions, some useful conclusions are gotten.
This paper focus on the application of integrated robot case packer in the secondary packaging line. The core component of the case packer is a new high speed pick-and-place parallel robot with three translational degrees of freedom. Case opening, packing, sealing and some other functions are integrated in the case packer. The scheme of control system and network configuration based on Simotion platform...
We report on a new iterative method for regularizing a nonlinear operator equation in Hilbert spaces. The proposed IIGRA algorithm is combination of nonlinear implicit iterative method and a gradient method for minimizing a modified Tikhonov functional. Under some not very strict assumptions, we will give a convergence result. Finally we present two numerical results for integral equation and parameter...
Present work shows the merits of space vector modulation direct torque control(SVM-DTC) over the conventional direct torque control(conventional DTC). SVM-DTC technique is helpful in solving the basic issues of torque ripple and variable swithing frequency present in the conventional DTC. In order to get the reference voltage vector which is necessary for the SVM-DTC, this paper describes a method...
Power density and heat density of multicore processor system are increasing exponentially with Moore's Law. High temperature on chip greatly affects its reliability, and the cost of packaging and cooling system increases exponentially with power consumption. For a multicore processor, the peak temperature of a block depends on its own power density as well as power density of other blocks on chip...
Inter-vehicle communication (IVC) network has become an important topic in research for its potential advantages in enhancing traffic security and efficiency. This paper investigates the communication performance of IVC networks in two lane bidirectional traffic streams. By changing the transmission range of communication units and penetration rate of equipped vehicles, we studied several performance...
We can design linear predictive model following control system (PMFCS) with commensurate time-delay whose internal states are bounded. Time-delay widely exists among controlled objects in computer control processes, power systems, chemical processing systems, metallurgical processing systems, environmental systems and communication systems transmission systems and other industrial production activities...
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