DC-DC Linearized Converter Model for Faster Simulation of Lightweight Urban Electric Vehicles

Abstract

The aim of this paper is to present a new bidirectional DC-DC linearized converter model for use in power demand and recovery units mainly used in Lightweight Electric Vehicle applications. The model significantly reduces the simulation time of the experiments performed, with up to a 4450-fold decrease in simulation times with respect to the original switched DC-DC topology. The study begins with a literature review of available switched converters, after which the presented topology is selected. The object-oriented modeling language Modelica is used to implement the converter in the Dymola modeling environment. Components and base classes from the Modelica Standard Library and VehicleInterfaces library are mainly used for better interoperability. Because of the intensive use of converters in the whole vehicle and the time consumed by the converter simulations due to high frequency commutation, a linearized DC-DC converter model is proposed. Comparison tests are performed between the reference switched models and the proposed linearized models in Dymola tool to validate the linearized model behaviour. Nearly identical responses are obtained for both models, while simulation times are reduced as much as 1/4450 for the linearized converter. Furthermore, validation tests are carried out between the proposed linearized model in Dymola and a reference switched model in LTspice specific purpose simulation package for switched electronic circuits. Excellent agreement in the responses of both models is observed. INDEX TERMS Computer simulation, continuous time systems, discrete-time systems, DC-DC power converters, energy efficiency, energy management, smart grids.

Switching and Averaging Models of a Bidirectional, Half-Bridge Based DC-DC converter with Load Distribution

“…Special focus is given to the identification and parameterization of the electrical components. In article (Navarro et al 2020), a continuous-time linearized model of a non-isolated bidirectional half-bridge DC-DC converter corresponding to the state-space averaging method is proposed. The key contribution hereby is the reduction of the time complexity.…”

Advanced Protection for the Smart Grid

“…These characteristics can also be analyzed through the adjacency matrix, as mentioned in Section 3. Therefore, the topology type is quickly deduced according to the actual application requirements through the programmable mathematical algorithm rather than spending years (2018)(2019)(2020)(2021)(2022) relying on the experience of researchers. In addition, other characteristics can be proposed according to the requirements.…”

“…Wang et al (2018) proposed a novel high-impedance fault detection method based on non-linear voltage and current characteristics. Bhandia et al (2020) used voltage and current waveform distortion detection of the distribution system to distinguish and detect HIF. Sedighi et al (2005) proposed a novel method for high-impedance fault detection based on a pattern recognition system in which wavelet transform was used for signal decomposition and feature extraction.…”

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