Attention Makers




A variable speed drive (VSD) system can work and continue operating under various switch faults. The control system is based on SLIDING MODE CONTROL (SMC) to reduce switching losses.

The Purpose

Continuous and high reliability drive systems with minimum switching loss is a required approach nowadays, systems that can deal with faults and to continue working under fault conditions with minimum output distortions. This project can detect faults and then apply a fault-tolerant control strategy. By this way, you do not have to stop your system at fault times. SMC is a discontinuous control system used for variable structure systems like electronic converters. SMC consists of two phases; reaching phase and sliding phase. Three conditions must be satisfied in SMC which are hitting condition, existence condition and stability condition.

The Technology

What makes this technology unique is using SMC (Sliding mode control) to control both three-phase rectifier and inverter. SMC controls two phases only of the three-phase converters (rectifier and inverter) based on the fact that current summation is zero, so that the third phase or the third leg is considered as a degree of freedom which is used to reduce switching loss and also used in fault-tolerant control strategy. Rectifier control by SMC by this way (controls two phases only to reduce switching loss) is never used before, besides the fault-tolerant control for SMC technique has never been introduced before.

Additional Details

Key words: Fault-tolerant control, Sliding mode control, Variable speed drive, Open switch fault.

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