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This paper proposes an improved stator flux control algorithm based on the torque feedforward control technique for interior permanent magnet synchronous motor (IPMSM). The proposed flux linkage control algorithm can prevent the d and q- axis voltages from saturation and improve the dynamic behavior. A lookup table is used in the torque feedforward control technique, which outputs the desired d and...
In this paper, the physical mechanism and models of oxide-based resistive-switching random access memory (RRAM) and the optimization of the devices and arrays are addressed and reviewed. The review focuses on our research achievements on the unified physical mechanism, physical-based models including switching and reliability behaviors, and the optimization design issues of the oxide-based RRAM.
With the increasing integration of the wind power into the power system, wind farm are required to be controlled as a single unit and have all the same control tasks as conventional power plants. The wind farm central controller receives control orders from Transmission System Operator (TSO), then dispatch the wind power reference to each wind turbine. One of the most commonly used dispatch methods...
This paper introduces the structure and operational mechanism of Modular Multilevel Converter-High Voltage Direct Current (MMC-HVDC) and the mathematical model for the MMC-HVDC system in d-q synchronous reference frame is developed. When supplying power to passive networks, the MMC-HVDC controller at the passive network side, which contains a novel inner fast current loop and an outer voltage loop,...
In order to investigate the change of time-frequency characteristics of vehicle/track/bridge coupling system caused by wheel tread reprofiling, a coupling model of vehicle/track/bridge system is developed, the empirical mode decomposition (EMD) and Hilbert-Huang Transformation (HHT) are introduced to the analysis of vibration signal. Based on the theory of vehicle/track/-bridge coupling dynamics,...
A full understanding of plant virus epidemiology requires studies at different scales of integration: from within-plant cell processes to vector population dynamics, behaviour and broader ecological interactions. Vectors respond to cues derived from plants (both healthy and virus-infected), from natural enemies and from other environmental influences, and these directly affect the temporal and spatial...
In this paper, we propose effective modeling and novel spectral-based propagation schemes to address the general problems of time-dependent quantum simulations. The integral solution of the time-ordered evolution operator is obtained accurately via direct Hamiltonian diagonalizations performed using the new eigenvalue solver FEAST. In addition, we have designed a new highly efficient basis transformed...
A multiscale model of blood clot (thrombus) formation is extended by adding a sub-model of the tissue factor (TF) pathway of blood coagulation to provide more biologically relevant description of coagulation process. A combination of experimental approach, image analysis and a multiscale modeling is used for studying role of factor VII and fibrin in limiting growth of a blood clot. The simulations...
This paper describes a fixed maximum power point analog control used in a step-down pulse width modulated power converter. The DC/DC converter drives a DC motor used in small water pumping installations, without any electric storage device. The power supply is provided by PV panels working around their maximum power point, with a fixed operating voltage value. The control circuit implementation is...
In this work a physical model for a SiC Junction Field Effect Transistor (JFET) is presented. The novel feature of the model is that the mobility dependence on both temperature and electric field is taken into account. This is particularly important for high-current power devices, where the maximum conduction current is limited by drift velocity saturation in the channel. The model equations are described...
A compact trench-gate IGBT model that captures MOS-side carrier injection is developed. The model retains the simplicity of a one-dimensional solution to the ambipolar diffusion equation, but at the same time captures MOS-side carrier injection and its effects on steady-state carrier distribution in the drift region and on switching waveforms.
With the development of power electronic techniques, more and more attention has been paid to DC power systems. This paper analyzes the load flow issues containing DC/DC converters in a DC power system. The load flow model of DC/DC converters, which considers the power losses and control strategy of the converter, has been presented and integrated into the traditional load flow algorithm by modifying...
Convective—diffusive mass transport coupled with a wall reaction in a planar Couette flow has been investigated. The system is isothermal and it features a first-order chemical reaction at the (upper) moving wall (or interface) combined with axial convective transport and lateral diffusion. The mathematical model defines a two-point boundary value problem in the lateral direction and an initial value...
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