Open AccessInter‐module state‐of‐charge balancing and fault‐tolerant operation of cascaded H‐bridge converter using multi‐dimensional modulation for electric vehicle application
Author(s) -
Kandasamy Karthik,
Vilathgamuwa Mahinda,
Tseng King Jet
Publication year - 2015
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2014.0943
Subject(s) - pulse width modulation , state of charge , modular design , battery pack , fault tolerance , battery (electricity) , voltage , electric vehicle , fault (geology) , engineering , computer science , electronic engineering , control theory (sociology) , power (physics) , automotive engineering , electrical engineering , control (management) , reliability engineering , physics , quantum mechanics , seismology , geology , artificial intelligence , operating system
This study presents a method for module‐level state‐of‐charge (SOC) balancing and fault‐tolerant operation of the cascaded H‐bridge (CHB) converter‐based battery energy storage system for electric vehicle (EV) application. The proposed methods are based on the multi‐dimensional pulse‐width modulation (MD‐PWM) strategy. It is shown that the proposed methods are conveniently integrated with the PWM generation algorithm. A conceptual design of modular battery pack (or micro‐pack) system using lithium‐ion cells for the CHB converter is described to show its feasibility for EV application. A brief review on the MD‐PWM strategy and a detailed explanation on the method to integrate the inter‐module SOC balancing and fault‐tolerant control with the PWM generation are presented. Experimental results from the laboratory setup of a five‐level CHB converter driving an induction motor with a battery system consisting of six 52.8 V 60 Ah (16 lithium‐ion cells in series) modules are presented to verify the system operation for fault‐tolerant control and the proposed SOC balancing method. The results demonstrate the need of SOC balancing, and efficacy of the proposed methods in achieving fault‐tolerant as well as SOC‐balanced operation to prolong the system operation.