Current Sensor Fault-Tolerant Control Strategy for Encoderless PMSM Drives Based on Single Sliding Mode Observer

2020 ◽  
Vol 6 (2) ◽  
pp. 679-689
Author(s):  
Gaolin Wang ◽  
Xiaofei Hao ◽  
Nannan Zhao ◽  
Guoqiang Zhang ◽  
Dianguo Xu
Keyword(s):  
Control Strategy ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Fault Tolerant Control ◽  
Sliding Mode Observer ◽  
Current Sensor ◽  
Sensor Fault

scholarly journals Sensors Fault Diagnosis and Active Fault-Tolerant Control for PMSM Drive Systems Based on a Composite Sliding Mode Observer

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1695 ◽  
Author(s):  
Qinyue Zhu ◽  
Zhaoyang Li ◽  
Xitang Tan ◽  
Dabo Xie ◽  
Wei Dai
Keyword(s):  
Fault Diagnosis ◽  
Control Strategy ◽  
Active Fault ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Fault Tolerant Control ◽  
Sliding Mode Observer ◽  
Sensor Fault ◽  
Active Fault Tolerant Control ◽  
Drive Systems

Due to the use of multiple observers and controllers in multi-sensor fault-tolerant control of PMSM drive systems, the algorithm is complex and the system control performance is affected. In view of this, the paper studies multi-sensor fault diagnosis and active fault-tolerant control strategies based on a composite sliding mode observer. With the mathematical model of PMSM built, a design method of the composite sliding mode observer is proposed. A single observer is used to observe and estimate various state variables in the system in real time, which simplifies the implementation of observer-related algorithms. In order to improve the diagnostic accuracy of different types of sensors under different faults, a method for determining fault thresholds is proposed through global search for the maximum residual value. Based on this, a fault diagnosis and active fault-tolerant control strategy is proposed to realize fast switching and reconstruction of feedback signals of closed-loop control systems under different faults of multiple sensors, thus restoring the system performance. Finally, the effectiveness of the proposed algorithm and control strategy is verified by simulation experiments

scholarly journals Sensor Fault Tolerant Control of a Fast Steering Mirror System Using Adaptive PI-Based Sliding Mode Observer and Hardware Redundancy

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Hongju Wang ◽  
Qiliang Bao ◽  
Wenshu Yang ◽  
Zidong Liu ◽  
Jing Tian
Keyword(s):  
Fault Tolerant ◽  
Sliding Mode ◽  
Experimental Studies ◽  
Fault Tolerant Control ◽  
Fault Isolation ◽  
Sliding Mode Observer ◽  
Feedback Signal ◽  
Prototype System ◽  
Sensor Fault ◽  
Primary Position

The aim of this paper is to present a sensor fault-tolerant control (FTC) scheme for a two-axis fast steering mirror (FSM) system with minimum power consumption and without changing the controller structure. In this paper, an adaptive PI-based sliding mode observer (APISMO) is adopted firstly to estimate the fault signal, which does not require any prior knowledge of the fault. The estimation is then used by the fault isolation logic to identify the fault. The redundant sensor would be powered up to replace the faulty one when faults occur. During the backup sensor booting up, for maintaining the normal performance of the closed-loop system approximately, a fault-free estimation of the position provided by the APISMO is used as feedback signal. Experimental studies on a prototype system show that the proposed APISMO can effectively reconstruct the fault signals even when the two primary position sensors are faulty simultaneously. Meanwhile, the effectiveness and performance of the proposed scheme have been verified.

scholarly journals Sensor Fault Reconstruction based on Adaptive Sliding Mode Observer for Forklift Fault-Tolerant Control System

2020 ◽  
Vol 10 (4) ◽  
pp. 1278
Author(s):  
Zhilu Zhang ◽  
Benxian Xiao
Keyword(s):  
Control System ◽  
Fault Detection ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Fault Tolerant Control ◽  
State Equation ◽  
Sliding Mode Observer ◽  
Sensor Fault ◽  
Adaptive Sliding Mode ◽  
Sensor Fault Detection

For the problem of multiple sensor fault detection and reconstruction in the forklift fault-tolerant control system, a sliding mode observer (SMO) with adaptive regulation law is proposed. Based on the three-degree-of-freedom (3-DOF) model of forklift, a linear state equation with output disturbance is designed as its equivalent sensor fault model. The sensor fault is converted into an actuator fault by defining an auxiliary state variable as an output signal filter. Then the SMO-based method of sensor fault detection and reconstruction is given. Without knowing the upper bound of an unknown fault, an adaptive sliding mode observer (ASMO) can also be effective through the adaptive algorithm. Finally, experimental results further verify the effectiveness of the method, and provide a foundation for forklift fault-tolerant control.

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