DocumentCode :
1756620
Title :
Current Residual Vector-Based Open-Switch Fault Diagnosis of Inverters in PMSM Drive Systems
Author :
Qun-Tao An ; Li Sun ; Li-Zhi Sun
Author_Institution :
Harbin Inst. of Technol., Harbin, China
Volume :
30
Issue :
5
fYear :
2015
fDate :
42125
Firstpage :
2814
Lastpage :
2827
Abstract :
This paper presents an open-circuit (OC) fault diagnostic method of inverters in closed-loop controlled permanent magnet synchronous motor drive systems based on current residual vector (CRV). This method can get rid of effects of the load and the main controller to obtain reliable detection. The motor drive system is a hybrid system composed of discrete switching signal events and continuous current state variables, which evolves in certain law driven by discrete events. At the base of analyzing operation modes of the system, a mixed logical dynamic (MLD) model of the motor drive system is built to estimate motor currents. Consequently, the proposed fault diagnostic scheme is constructed by the healthy current estimator based on the MLD model in parallel with the plant. When an OC fault occurs, the CRV between the estimator and the plant will show featured amplitude and phase, and hence the fault can be detected. The method utilizes variables already used by the main controller, avoiding the use of extra sensors. During the implementation, amplitude threshold and phase sector are used in order to avoid effects of measurement errors, model parameter errors and noises, which improves the reliability and robustness. Simulation and experimental results validate the proposed diagnostic method, and the diagnostic duration can be reduced within a quarter of fundamental wave period.
Keywords :
closed loop systems; discrete event systems; electric current control; fault diagnosis; fault tolerant control; invertors; machine vector control; permanent magnet motors; reliability; synchronous motor drives; MLD model; PMSM drive systems; amplitude threshold; closed-loop controlled permanent magnet synchronous motor drive systems; continuous current state variables; current residual vector-based open-switch fault diagnosis; discrete switching signal events; inverters; mixed logical dynamic model; motor current estimation; phase sector; reliability improvement; Circuit faults; Fault diagnosis; Inverters; Sensors; Switches; Vectors; Windings; Current residual vector (CRV); current residual vector; fault diagnosis; hybrid system; inverter; mixed logical dynamic; mixed logical dynamic (MLD);
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2014.2360834
Filename :
6913528
Link To Document :
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