Title :
A new control method for minimizing the DC-link capacitor current of HEV inverter systems
Author :
Sommer, Christoph ; Merkert, Arvid ; Mertens, Axel
Author_Institution :
Inst. for Drive Syst. & Power Electron., Leibniz Univ. Hannover, Hannover, Germany
Abstract :
This paper presents a new control method for boost DC/DC converters combined with voltage source inverter systems to minimize the DC-link capacitor-current RMS value. The examined converter system consists of a multi-phase boost converter and a three-phase inverter with common DC-link capacitor. A general analytical expression for the DC-link capacitor-current RMS value is derived, which allows to optimize the switching pattern for the boost converter phases and the DC-link voltage level. Measurements from a laboratory setup verify the analytical equations and reproduce the calculated values of the RMS current. Since the DC-link capacitor RMS current stress determines the capacitor size and is independent of the switching frequency, this work contributes to a further volume reduction of passive components especially for high frequency converter systems.
Keywords :
DC-DC power convertors; electric current control; electric current measurement; hybrid electric vehicles; invertors; optimisation; power capacitors; switching convertors; DC-link capacitor RMS current stress; DC-link capacitor current RMS value; DC-link voltage level; HEV inverter systems; analytical equations; boost DC-DC converters; boost converter phases; control method; high frequency converter systems; hybrid electric vehicles; multiphase boost converter; switching frequency; switching pattern; three-phase inverter; voltage source inverter systems; Capacitors; Current measurement; Integrated circuits; Inverters; Stress; Switching frequency; Voltage control;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Conference_Location :
Pittsburgh, PA
DOI :
10.1109/ECCE.2014.6953535
