Direct torque control of permanent magnet brushless AC drive with single‐phase open‐circuit fault accounting for influence of inverter voltage drop. Issue 5 (1st May 2013)

• Record Type: Journal Article
• Authors: Hoang, Khoa Dang; Zhu, Zi‐Qiang; Foster, Martin
• Is Part Of: IET electric power applications. Volume 7:Issue 5(2013)
• Page Start: 369
• Page End: 380
• Publication Date: 2013-05-01
• Subjects: AC machines -- brushless machines -- compensation -- electric current control -- electric drives -- electric potential -- estimation theory -- fault diagnosis -- invertors -- machine control -- machine theory -- magnetic flux -- mathematical analysis -- permanent magnet machines -- phase control -- stators -- torque control -- voltage control; direct torque control -- permanent magnet brushless AC drive -- single‐phase open‐circuit fault accounting -- DTC -- PM BLAC -- SOF -- IVD -- voltage model‐based stator flux estimation scheme -- current model‐based stator flux estimation scheme -- modified mathematical model -- stator open phase winding -- relevant flux linkage -- torque production -- post‐fault operating mode -- six‐switch three‐phase inverter voltage drop influence -- compensation method -- fault‐tolerant control; Electric power -- Periodicals; Electric power systems -- Periodicals; 621.305
• DOI: 10.1049/iet-epa.2012.0290
• Languages: English
• ISSNs: 1751-8660

Abstract

Abstract : This study presents a novel direct torque control (DTC) of permanent magnet (PM) brushless AC (BLAC) drive under single‐phase open‐circuit fault (SOF) accounting for the influences of inverter voltage drop (IVD), together with novel current model‐based and voltage model‐based stator flux estimation schemes for post‐fault operation. It is demonstrated that for accurately elaborating the modified mathematical model, the voltage induced in the stator open phase winding and its relevant flux linkage should be taken into account although they do not contribute to torque production in the post‐fault operating mode. It is also proven that reconfiguration of the conventional six‐switch three‐phase inverter for the purpose of fault‐tolerant control results in a significant magnitude imbalance between the α ‐ and β ‐components of IVD. Thus, the influences of this unbalanced issue on performance of the two proposed stator flux estimation methods are investigated in details and a compensation method for the voltage model‐based stator flux estimator is proposed and experimentally verified. It is shown that fault‐tolerant control with high performance operation can be maintained for a DTC‐based PM BLAC drive under SOF using the proposed modified mathematical model.