# An experimental demonstration of hybrid fuzzy-fuzzy space-vector control on AC variable speed drives

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## Abstract

This work presents the experimental demonstration of a hybrid fuzzy-fuzzy controller speed control of a squirrel-cage induction motor variable speed drive based on the space-vector pulse width modulation technique by means of digital signal processing. In particular, two features of field-oriented control were engaged to design a hybrid fuzzy-fuzzy controller, namely the current and frequency. In order to overcome the limitations of the field-oriented control technique, the principle of the hybrid fuzzy-fuzzy controller is introduced in the course of the acceleration–deceleration stages to regulate the speed of the rotor with the help of a fuzzy frequency controller. Conversely, a fuzzy stator current magnitude controller was involved during the steady-state. The results revealed that the control approach has the ability to deliver a practical control solution in the presence of diverse operating conditions.

## Keywords

hybrid fuzzy-fuzzy control DSP controller space-vector pulse width modulation squirrel-cage induction motor indirect field-oriented control hall-effect current sensors## Abbreviations

- ABC
Artificial bee colony

- AC
Alternate current

- ACO
Ant colony optimization

- A/D
Analog to digital converter

- ANN
Artificial neural network

- BF
Bacteria foraging

- BSA
Bat search algorithm

- CCS
Code composer studio

- DAQ
Data acquisition card

- DC
Direct current

- DFOC
Direct field-oriented control

- DMC
Digital motor control

- DSP
Digital signal processing

- DTC
Direct torque control

- FFA
Firefly algorithm

- FL
Feedback linearization

- FLC
Fuzzy logic control

- FOC
Field-oriented control

- Fuzzy-PI
Fuzzy proportional-integral control

- GA
Genetic algorithm

- HFFC
Hybrid fuzzy-fuzzy control

- HFPIC
Hybrid fuzzy-PI control

- ICA
Imperialist competitive algorithm

- IFOC
Indirect field-oriented control

- IM
Induction motor

- PI
Proportional-integral control

- PC
Personal computer

- PSO
Particle swarm optimization

- PWM
Pulse width modulation

- QEP
Quadrature encoder pulse

- SCIM
Squirrel-cage induction motor

- SMC
Sliding mode control

- SVPWM
Space-vector PWM

- USB
Universal serial bus

- VSI
Voltage source inverter

## Notes

### Acknowledgements

The contributions of Universiti Teknologi PETRONAS (UTP) in terms of a graduate assistantship scheme award and the Universiti Research Internal Fund (URIF) No. 10/2013 are gratefully acknowledged.

### Compliance with ethical standards

### Conflicts of Interest

The authors declare no conflict of interest.

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