A sliding mode fuzzy control method which combines sliding mode and fuzzy logic control for DC-DC boost converter is designed to achieve robustness and better performance. A fuzzy sliding mode controller in which sliding surface whose reference is obtained from the output of the outer voltage loop is used to control the inductor current. A linear PI controller is used for the outer voltage loop. The control system is simulated using Matlab/Simulink. The simulation results are presented for input voltage and load variations. Simulated results are given to show the effectiveness of the control system.

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DSP implementation of speed control of three phase induction motor drive is presented in this paper. A closed loop speed control has been achieved using constant V/f technique which is a simple scalar control method used to control the magnitude of the control quantities. In this study, a fourth order polynomial drived from V/f curve is constructed instead of using look up table which takes much time for determination of voltage from frequency value. A PI controller is used in speed control.  dSPACE DS-1103 controller board is used for the implementation with Matlab/Simulink, which has a simple real time interface. Steady-state speed characteristics and transient responses with various reference speed commands are presented by experimental system.  The simulation and experimental results provide a smooth speed response and good performance under various dynamic operations. Real time speed control has been implemented and some results are presented.

This study presents a new energy efficient V/f speed control of single-phase induction motor. The method is implemented with a single-phase inverter in which extreme learning machine technique is used to achieve selective harmonic elimination pulse width modulation. The objective is to adjust the speed of the single-phase induction motor while eliminating undesired low-order harmonics. Algorithm is developed using MATLAB/Simulink high-speed adaptation was obtained even at low-and high-speed regions. The results showed the effectiveness of the proposed method. The reduction in the total harmonic distortion is achieved in all operation range of V/f speed control.

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