Jonghoon Kim

Design and control of an interleaved bi-directional power converter for railway applications

This paper is with regard to a topology of an interleaved bidirectional buck-boost power converter for railway applications. The objectives of this proposed power converter topology are to suppress the harmonics at the both sides of the input terminal and output terminal using this topology. Since the both sides of voltages have wide operating ranges such as the battery voltage ranging 500V∼700V, and the DC link voltage ranging 500V∼1000V, the control algorithm for this power converter is investigated especially at the aspect of smoothing transients caused by the changes of current direction and the modes of operation(buck or boost modes). Control design, and simulation and experiment results are presented to validate the proposed system.

Differentiation of ECM and noise model/data rejection for high-capacity and high-power cell according to the electrical characteristics

This study presents a differentiation of equivalent circuit model ECM (equivalent circuit model) and noise model/data rejection for high-capacity and high-power lithium-ion cell. Firstly, this work introduces basic ECM and some noise model and data rejection techniques. Secondly, this work compares electrical characteristics of the high-capacity and high-power lithium-ion cell. And, ideal modeling of equivalent ECM and data rejection techniques are selected by electrical characteristics. Finally, the results of SOC (state of charge) estimation based on EKF (extended Kalman filter) are compared.

Optimized implementation of a DC-DC power converter modeling and control strategy for efficient operation of a photovoltaic application

This paper describes a small signal model, voltage controller design and its implementation for a DC/DC converter in a PV(Photovoltaic) system. The detailed small signal model is proposed to design a voltage controller for the system. Based on the proposed small signal model, a voltage controller for the PV system is designed and tested with different internal resistances of the PV system. The designed voltage controller is validated through a DSP(Digital Signal Processor) based prototype PV system.