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This paper presents a hybrid approach to simulate harmonic dynamics of switched networks connected to nonlinear electrical devices. The proposed approach relies on i) representation of the switched part of the network via generalized averaged models (GAM) and ii) modeling of the nonlinear part of the network via extended harmonic domain (EHD). It is shown that computational savings are achieved by...
Nowadays, power consumption is the one key factor that hinders System-on-Chip (SoC) performance. In order to reduce the power consumption, accurate and efficient power models have to be introduced early in the design flow, when most of the optimization potential is obtained. However, early accuracy cannot be ensured because of the lack of precise knowledge of the circuit structure. Current SoC design...
Model-based fault isolation and identification in hybrid systems is computationally expensive or even unfeasible for complex systems due to the presence of uncertainty concerning the actual state, and also due to the presence of both discrete and parametric faults coupled with changing modes in the system. In this work we improve fault isolation and identification performance for hybrid systems diagnosis...
The Generalized Nets apparatus is applied here to describe the MiMa-algorithm for computing a conflict-free schedule for packet switch. In the paper we propose a family of patterns for nonuniform traffic simulation. The results for throughput on a switch node with MiMa-algorithm by computer simulations with these patterns are presented. The necessary computations have been executed on BG01-IPP grid-cluster...
In this work, a molecular dynamics simulation was performed to investigate a reversible hydrophobic-hydrophilic properties of a surface model as a function of external electric potential. The surface is composed of a self-assembled monolayer (SAM) of a functionalized carbon chains that are immobilized on a supporting metal surface. The simulation shows that the change of SAM configuration can be reversibly...
High Voltage DC systems are gaining widespread attention due to the advances in power electronic devices and converters. MMCs are very popular nowadays in this type of application. This paper first revisits the dynamic equations of the circulating current of a MMC to incorporate a disturbance term. Based on the modified equations, a disturbance rejection controller is proposed to eliminate the double...
In recent years, there has been rapid growth of Photovoltaic (PV) system integration into diesel-based remote microgrids to reduce the diesel fuel consumption. However, due to low correlation of PV power availability with the load as well as uncertainty and variability of the PV power, the benefits of the integration have not been achieved properly. A large energy reserve is required to compensate...
An FPGA implementation of Model Predictive Direct Current Control (MPDCC) is reported in this paper. A central scheduler enumerates switching sequences and assigns these to several explorer units, which predict the system response and compute their associated cost. The proposed FPGA design is scalable, modular and requires little hardware resources. A five-level active neutral point clamped inverter...
Switched power systems are inherently difficult to simulate, due to the significant sensitivity of the simulation algorithm to the timing of the switching events as well as the potentially complex dynamics of the components. Numerical simulation techniques, while flexible, are not well suited for large time scale simulation of such systems. Methods for increasing the accuracy of numerical simulation...
A real-time simulation for the Cascaded STATCOM fully implemented on field-programmable-gate-arrays (FPGA) is proposed in this paper. The switching-function model for the STATCOM is employed, where the IGBTs and diodes are taken as ideal switches, to reduce the amount of calculation. With the help of external circuit calculation, the operation in dead-time period is taken into consideration, which...
This paper presents a method for synthesis of control alphabet policies, given continuum descriptions of physical systems and tasks. First, we describe a model predictive control scheme, called switched sequential action control (sSAC), that generates global state-feedback control policies with low computational cost, given a control alphabet. During synthesis, sSAC alphabet policies are directly...
Correlation filters have recently been popular due to their success in short-term single-object tracking as well as their computational efficiency. Nevertheless, the appearance model of a single correlation filter based tracking algorithm quickly forgets the past poses of the target object due to the updates over time. To overcome this undesired forgetting, our approach is to run trackers with separate...
We are proposing a new active thermal-electronic device, the phonsistor (= phonon transistor). This device operates by means of thermal or hot electron coupling between adjacent domains containing metal-insulator transition (MIT) material. The MIT resistor itself has got thyristor-like I–V characteristics due to the high electric field and/or Joule heating and extremely strong step-like resistance...
Chattering is a fundamental phenomenon that is unique to hybrid systems, due to the complex interaction between discrete dynamics (in the form of discrete transitions) and continuous dynamics (in the form of time). In practice, simulating chattering hybrid systems is challenging in that simulation eectively halts near the chattering time point, as an innite number of discrete transitions would need...
We propose a model of a battery switching station (BSS) for electric buses (EBs) that captures the predictability of bus operation. We schedule battery charging in the BSS so that every EB arrives to find a battery ready for switching. We develop an efficient algorithm to compute an optimal schedule. It uses dual decomposition to decouple the charging decisions at different charging boxes so that...
High-pulse line-commutated rectifiers are utilized in many high-power applications. Specifically, twelve-pulse rectifiers fed with six-phase synchronous generators are very popular in marine and aircraft power systems with variable frequency operation. Using numerically efficient averaged models of power electronics converters considerably saves simulation time when a large number of switching converters...
Motor is the heart of many industrial automation and motion control applications. Brushless DC (BLDC) motor drives are widely used in a many applications, ranging from low to high power applications, because of their high efficiency, low maintenance, require small space, salient operation and high torque to power ratio, etc. The rotor position must be acquired in order to drive a BLDC motor. The position...
This paper presents study of a DC-DC boost converters hybrid model based on explicit MPC. By putting a constraints on state variable, optimization problem is designed and computed off-line, which reduces the on-line computation complexity. In simulation results, reference tracking and disturbance rejection to change in load are performed to show the robustness of controller. The advantages of explicit...
In this paper a network reconfiguration model aimed to be used in an industrial context is presented. It is based on a min-cost flow problem (MCFP) and a simplified power flow calculation. Mixed Integer Quadratic Constrained Programming (MIQCP) and Mixed Integer Non linear Programming (MINLP) are used and compared to compute the network reconfiguration with off-the-shelf optimization solvers. Two...
In this paper a model is developed to solve the on/off scheduling of (non-linear) dynamic electric loads based on predictions of the power delivery of a (standalone) solar power source. Knowledge of variations in the solar power output is used to optimally select the timing and the combinations of a set of given electric loads, where each load has a desired dynamic power profile. The optimization...
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