What's in the issue?
Power supply and electrical equipment
SOH estimation of EV and HEV lithium-ion battery applications
Skripko L.This paper reports some results relating to a new method of state-of-health (SOH) estimation for battery-based systems of electro- and hybrid vehicles. Some main challenges were addressed for the accurate estimation of SOH at runtime. Relevance of the problem raised is the need to control the SOH of batteries in order to prevent the experiment results show the feasibility and effectiveness of the algorithm for LFP 20Ah cells.
Keywords: Algorithmic, Kalman Filter, lithium battery, calculation, state-of-health, EV, HEV.Model identification for voltage regulator of diesel locomotive starter generator
Shapran F., Sergeev B.This paper proposes a model of voltage regulator of starter-generator of diesel locomotive taking electrical assemblies into account which let us analyze the working modes of voltage regulator with diesel locomotive equipment. Failure modes of voltage regulator elements were revealed and design decisions of reliability and electromagnetic compatibility enhancement were defined by the model.
Keywords: power converter, step-down converter, voltage regulator, starter-generator, electromagnetic compatibility.Selection and optimization of design parameters for reversible reciprocating electric machine
Safin A., Ivshin I., Kopylov A., Gracheva E., Tsvetkov A.The article presents the technique of design parameters choice and substantiation for a reversible electric machine with reciprocating motion in the engine and generator mode. The aim of the study is to calculate the rational parameters of an electric machine to ensure maximum energy efficiency taking into account the given conditions. The concept of parallel simulation (Co-Simulation) is proposed. The concept is based on the data exchange between the programs MATLAB Simulink, CATIA V5 and a special program. The concept makes it possible to exchange the data between the marked programs to improve the efficiency, accuracy, simulation and optimization of the parts structural dimensions. These values are placed in a 3D model of a linear electric machine in CAD CATIA V5 for later kinematic and strength calculation. The modeling data in the software package MATLAB Simulink based on the programs written in MATLAB are transferred to the project table Excel, which is synchronized with the CAD CATIA V5. CATIA V5 develops 3D models of an electric machine stator and translator. The developed method allows to determine the rational parameters of an electrical machine during a design stage, followed by an adjustment during the manufacture of an experimental sample.
Keywords: reciprocating electric machine, simulation, three-dimensional modeling, optimization, energy efficiency.