Abstract
The paper describes a vector-controlled fault tolerant control (FTC) structure for permanent magnet synchronous motor (PMSM) drives. As a control algorithm, the classical field oriented control was applied. For the proper operation of this drive, minimum two current sensors are necessary, however, in the FTC drives additional redundant transducers are applied. Each measuring sensor, including current sensors, are susceptible to damage and can lead to unstable operation of the drive. The presented control structure, with a diagnostic and compensation system, is robust to the typical current sensor faults—lack of signal, intermittent signal, variable gain, signal noise and signal saturation. The fault detection algorithm is based on the signal method. The fault diagnostic system is tested in two control algorithms—the scalar control and vector control ones—to demonstrate the transient of the faulted signals, detection signals and detection time. After current sensor fault appearance, its influence on the control structure, especially speed transient, is compensated using non-sensitive components. The analysis is presented for all the abovementioned faults for different speed conditions.
Highlights
IntroductionThere is an increasing effort to develop systems that can be resilient or compensate for various types of faults in industrial processes
The article presented an algorithm for the detection and compensation of damage to stator current sensors in the vector control system of permanent magnet synchronous motor (PMSM) drives
Tests were presented for a system without feedback from measuring sensors, in order to illustrate the operation of the fault detector and the full field oriented control (FOC) system
Summary
There is an increasing effort to develop systems that can be resilient or compensate for various types of faults in industrial processes. It is especially important in industries such as spacecraft, aircraft and automotive applications. This issue applies to electric drives, which are complex and complicated systems where even a minor failure may have serious consequences [1]. Electrical drives which use technologies leading to increased safety at the level of the appearance of mechanical and electrical damages are called fault tolerant control systems (FTCS).
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