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Precise prediction of battery open circuit voltage (OCV) has significant impacts on the battery state estimation and safe operation. Most of the current prediction methods rely on complex data acquisition and parameter identification that requires complicated calculation or modeling. This paper proposed a fast OCV prediction approach based on exponential recovery voltage. Only three voltage values...
Modular Multilevel Converter (MMC) topology is an interesting solution for number of medium and high voltage applications. Key advantages over another multilevel topologies include flexibility of scaling in voltage and simple implementation of redundancy. In this publication control of DC-DC MMC is discussed. Analyzed converter consists of six branches connected in double wye structure. It enables...
The paper presents the results of an analysis of the inter-turn fault effects on the voltage and current waveform of the capacitor discharge through transformer winding. The research was done within the FAIR project for which a measuring and diagnostic system for testing the condition of electrical circuits of superconducting electromagnets system is being developed. Appropriate measurements and simulations...
We are considering the problem of controlling a single-phase Multicellular inverter with LC output filter. The control objectives are: (i) generating a sinusoidal voltage with amplitude and industrial frequency fixed by the reference signal, (ii) ensuring a good convergence of the voltages across the flying capacitors. The controller is designed using the backstepping approach in its adaptive versions...
Super-capacitor with the features of high power density and long life is used as a new kind of energy storage methods for electric bus. State of charge (SOC) indicates the remaining power, which is very important for super-capacitor bus. In this paper, a SOC estimate method based on sliding mode observer is studied. The design of sliding mode observer is based on the “two-branch” equivalent circuit...
This paper based on the commutation mechanism of series capacitor commutated converter (CCC), the CCC is applied to UHVDC transmission system, and the mathematical model of reactive power demand of CCC inverter is established. According to the actual parameters of Jiuquan-Hunan ±800 kV UHVDC transmission project, the simulation model of CCC- UHVDC system is built by PSCAD/EMTDC simulation software...
Since the introduction of finite control set model predictive control (FCS-MPC) in power electronics the algorithm has been missing an important aspect that would speed up its implementation in industry: a simple method to verify the algorithm performance. This paper proposes to use a statistical model checking (SMC) method for performance evaluation of the algorithm applied to power electronics converters...
Simple approach for electromagnetic interference estimation, which are caused by the class D amplifiers for audio applications, is proposed. Main idea is that the amplifier-on-chip is represented as EMI current source which parameters are measured under predetermined conditions. In the case of integrated circuit housing it is not necessary to know internal structure of the amplifier. Furthermore chip...
This document establishes the theory and the guidelines for a MMC-HVDC (High Voltage Direct Current Modular Multilevel Converter) modelling and control algorithm. Using a defined mathematical model, the control of a MMC-HVDC is implemented in a simulation software (MATLAB).
Modular Multilevel Converters(MMCs) are considered to be state-of-the-art power converters for high voltage applications. MMCs typically consist of a stack of capacitor-switch assemblies (known as sub-modules), and requires voltage balancing control of multiple floating capacitors. To make these control decisions accurate, it is necessary to have precise knowledge about voltages across each of these...
We have experimentally investigated the polarization-limited operation speed of Negative Capacitance FET (NCFET) through direct measurement of negative capacitance in transient behavior of ferroelectric HfO2 capacitor and physics-based modeling, for the first time. Systematic analysis of frequency dependence and transient characteristics of ferroelectric HfO2 capacitor enabled accurate parameter extraction...
By utilizing an inherently symmetrical differential structure, several boost DC/DC converters can be used to construct a multi input DC/DC or DC/AC converter. The use of integral state feedback based pole placement control strategy has been reported in the literature to control this type of converter. However, this control method is based on the small signal model of the circuit and highly dependent...
This paper introduces a predictive voltage controller for multilevel inverter used in Dynamic Voltage Restorer, which is able to protect a sensitive load against grid voltage sags dynamically. The compensated voltages are obtained by using Phase-Lock Loop to detect the phase and the magnitude of the grid voltage then compare to the load reference voltage. A three-phase NPC inverter with output LC...
The buck-boost inverter can be easily used to construct a multi-input converter due to its inherent symmetrical and extendable differential structure. This paper proposed a multi-input converter derived from the buck-boost inverter to interface different input sources. When two pure DC voltages are chosen as the references for the two output capacitor voltages, the proposed converter will operate...
A technique to actively balance the voltages on series-connected capacitors designated to split DC sources whose loads comprise power converters is presented. It performs such balancing dynamically, enabling the voltage equalization even for small capacitors under wide power and voltages ranges. Proposal consists on lightly controlling the power of one input capacitor for each pair, measuring their...
Failures in high voltage equipment are often caused due to internal faults which cause a local electrical stress concentration in the insulation, known as partial discharge. Thus detection of partial discharge is very important for early detection of insulation failure. This paper presents a low cost design and implementation of partial discharge measuring equipment for a high voltage laboratory....
This paper considers the utility of several alternative energy measures to reduce the energy required by a stimulation current source to charge a neuron membrane capacitance to a prescribed value in the case of a single sodium channel. For a simple case, minimizing the energy of the nonlinear channel conductance provides improved efficiency in terms of stimulator energy as compared to minimizing a...
In most substation protection studies, capacitor bank parameters are derived from manufacturer nameplate values. However, the actual parameters could be different from the nominal rating as a result of manufacturing variance, assembling, material aging, and temperature dependencies. Wide manufacturing tolerance could lead to non-negligible calculation inaccuracy that affecting successive studies....
Single-phase three-level NPC inverters are useful for applications in residential areas, where a DC source is available, such as from Photo Voltaic (PV) source or Vehicle-to-Home (V2H) systems. This paper proposes a modeling approach of this type of inverter with SVPWM using a state-space approach, which can be an important tool for the analysis of the dynamics of the inverter when the load changes...
A three-phase ac-ac matrix converter for inductive power transfer (IPT) systems with soft-switching operation and bidirectional power flow is introduced. The proposed converter can generate high-frequency current directly from a three-phase ac power source without a dc link. Unlike conventional ac-dc-ac converters, the proposed converter can provide a high frequency current without any current sag...
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