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This paper proposes a transformer-less modular multilevel DC/DC converter. The proposed converter can be used to interconnect two HVDC systems with different dc voltage levels and realize bidirectional power flow. Based on the arm energy balance condition, the optimal design arming at minimum inner circulating current is presented. A power close-loop control method is adopted to regulate the converter...
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...
Because the numerous nonlinear components and fiber interfaces are used in Module Multiple Converter (MMC), the HIL test of MMC with detailed EMT model and the full-scale interface is hard to be implemented. In recent years, this existing disadvantage caused the MMC controller hardware and software difference between the HIL test and real project. In this paper, a detailed EMT model of hybrid MMC...
Control of the air-fuel ratio (AFR) in gasoline engines is of imminent importance when aiming at minimizing calibration effort and meeting performance requirements. In this paper, this is achieved by employing triple-step method, which keeps the air-fuel ratio close to the stoichiometric value. The structure of the designed controller consists of three parts: steady-state control, feed-forward control...
Traditional GPSR and its enhanced protocols make forwarding decision only basing on one specific segment of the neighborhoods, thus the Successful Date Rate (SDR) often seems unpleasing. And the constant beacon interval always cause data collisions when the vehicle densities meet a high level. To solve the problems, we introduce a concept - the Coefficient of Dependence (CoD), to describe the contribution...
The high-capacity modular multilevel converter (MMC) is becoming the most popular type of voltage-source converters for high voltage direct current (HVDC) transmission. However, the nonlinearity of the loss characteristics of the switching devices and the complexity of the switching patterns impose great challenge on the loss modeling of MMC. The present methods still have some flaws in modulation...
This paper discusses the industrial space layout optimization under different TFP evolutionary paths simulated by grey prediction models. We construct a simulation and analysis model about the progress of regional industrial layout adjustment in project level. On the basis of the model, we analyze the economic-ecology balance of the regional industrial space layout. The results show that the short-term...
In this paper, we simplify the dynamics of a bounding quadrupedal robot by using a planar and conservative model which has a rigid body and two massless virtual spring legs to separately simulate the effects of the front and hind legs. The quantitative formulation of the model is derived by using the Lagrangian method. We proceed to search for stable operation points in state space, and the local...
In this paper, from the viewpoint of function approximation, the mathematical model of a class of FFT-based methods is rigorously analyzed, and then a numerical model of higher accuracy is derived. Numerical examples are proposed to test the accuracy of the proposed method and demonstrate the correctness of the proposed method.
This paper is concerned with the event-triggered finite-time control scheme for unicycle robots. First, Lagrange method is used to model the unicycle robot at the roll and pitch axis. Second, on the basis of the established model, an event-triggered finite-time control scheme is proposed to balance the unicycle robot in finite time and to determine whether or not control input should be updated. The...
The development of a scalable and user-friendly SPICE model is a key aspect of exploring the potential of spin-transfer torque MRAM (STT-MRAM). A self-contained magnetic tunnel junction (MTJ) SPICE model is proposed in this work which can reproduce realistic MTJ characteristics based on user-defined input parameters such as the free layer's length, width, and thickness. Using the propose model, scalability...
SPECK is a family of lightweight block cipherspublished by the U.S. National Security Agency in 2013. TheSPECK family consists of 10 versions, supporting a wide rangeof block and key sizes. Recently H. Tupsamudre et al. gave anapproach to recovering the last round key of SPECK familywith n/3 fault injections, where 2n is the block size. In thispaper, we present two improved differential fault attacks...
Drivers use kernel extension functions to manage devices, and there are often many rules on how they should be used. Among the rules, utilization of paired functions, which means that the functions must be called in pairs between two different functions, is extremely complex and important. However, such pairing rules are not well documented, and these rules can be easily violated by programmers when...
This short paper introduced the piezoelectric sandwich transducer and obtained the vibration ratio between the front and back metal covers according to the electromechanical equivalent circuit derived by force and electric analogy method. The transducer's resonance frequency is calculated using MATLAB programming, following by an experiment performed on a 1.5m long 50kg / m rail under laboratory conditions...
Dual active bridge dc/dc converter with high frequency isolation is gaining more attentions due to its small size and high-power density. In this paper, the principle of series resonant dual active bridge(SRC-DAB) DC-DC converter is discussed based on the fundamental analysis. The control method and principle of soft switching are also presented. Finally, the analysis is verified by computer simulation...
In this paper, a novel simple algorithm of nonlinear load simulation is proposed. The characteristic of load simulation is very important for power electronic load (PEL). About this content, there are few articles mentioned, especially the study of nonlinear load simulation algorithm is less. So on the basis of linear load simulation algorithm introduced, this paper summarizes a kind of algorithm...
A theoretical and testing research is put forward for fitful halt of disengaging rod system in a weapon launch pad in this paper. The equivalent dynamics model of disengaging rod system is established. The dynamics characteristic of the system is analyzed using quasi-static method. Test and measurement for disengaging rod system is carried out. The analysis result for the reason of fitful halt of...
This paper investigates the problem of solving sup-conjunctor composite finite interval-valued fuzzy relational equations over complete Brouwerian lattices. First, we introduce the notions of tolerable solution set, united solution set and controllable solution set, respectively and discuss their properties. Secondly, we obtain some necessary and sufficient conditions that these solution sets are...
The traditional Chan-Vese (C-V) model is sensitive to noise and inaccurate positioning of the edges in an image. This paper proposes a C-V model based on the Gaussian Laplace operator. By smoothing the image, the Gaussian smoothing function can reduce noise on the image segmentation. The Laplace operator can detect zero crossing points, and then determine the edge positions of the image. The experiments...
In this paper we propose a structure based sparse model with different constrains by extending the general sparse model to the multiple pixels case, where each pixel together with its neighboring pixels are used simultaneously in the sparse representation of chromosome classes. We use the model to classify multicolor fluorescence in-situ hybridization (M-FISH) images. Both the simulation and real...
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