In this study, a fast terminal sliding-mode control scheme is proposed as a new approach for the voltage tracking control of the DC-DC boost converter affected by disturbances, such as the variations in the input voltage and the load resistance. Some experiments are performed on a test bench to show the effectiveness of the proposed approach. The fast reference tracking capability with small overshoot and robustness to the disturbances of the designed controller is verified by the experimental results. Moreover, the results demonstrate that the proposed controller has a better performance related to conventional sliding mode and proportional-integral controllers in terms of the settling time and robustness to the disturbances.

In this study, a fast and fully software-based algorithm for digital phase-locked loop (PLL) is proposed via a new hybrid approach in software and hardware by using an advanced digital signal processor architecture. The proposed algorithm is robust against line disturbances such as phase-angle jump, voltage sag, third harmonic injection, multi-zero crossing and step change in frequency at the input voltage. Performance and robustness of the proposed method are investigated through experimental studies. Furthermore, it is compared with three different PLL algorithms in detail to show its superiority over existing methods.

In this study, a single sensor-based maximum power point tracking (MPPT) algorithm is presented for permanent magnet synchronous generator-based wind energy conversion system (WECS). The MPPT method used in this study uses only the wind speed sensor to generate the reference point required for the maximum power. A discrete-time controller is proposed to bring the system to the reference point determined by the MPPT algorithm. The designed MPPT controller consisting of a new discrete-time reaching-law approach and a discrete-time integral sliding mode control (SMC). The designed discrete-time SMC-based controller is implemented by using an Acorn RISC Machine (ARM)-based LM4F120 microcontroller, and its performance is examined on a WECS emulator prepared in the laboratory. The results got from the real-time studies prove that the proposed controller has the satisfactory performance to bring the system to the MPP. The performance of the proposed controller is also compared with the conventional sliding mode controller and perturb and observe method. The obtained results proved that the proposed controller has a better performance than the other controllers in terms of the settling time and output voltage's ripple.

In this study, a robust voltage-mode controller for DC-DC boost converter subject to time varying parameters is presented. The time-varying parameters of the boost converter are considered as the input voltage, the load resistance and the passive components (inductor and capacitor). The proposed controller, designed in discrete time, is based on the sliding mode control combined with the model-reference approach. In addition to this controller structure, the system dynamics are augmented by integral action to ensure zero steady-state tracking error. Experimental results, obtained from prototype operating at the fixed frequency, are provided to demonstrate the excellent robustness of the designed controller against wide input voltage variations and large load transients and also variation in passive components.

This study proposes a discrete-time integral terminal sliding mode controller (DITSMC) integrated with a sensorless maximum power point tracking (MPPT) method for a permanent magnet synchronous generator (PMSG)-based wind energy conversion system (WECS). The effects of the parameters of the proposed DITSMC on the convergence-time and the errorbound are investigated by the simulation studies. The dynamic performance of the DITSMC has been evaluated experimentally on a test bench for step-type wind changes. The optimum coefficient between the output voltage of the generator and the extracted power from the WECS is determined only for a wind speed by offline studies. Then, the MPPT can be provided using this coefficient for all wind speeds in the operating range of the WECS without any mechanical sensor. Additionally, the experimental studies show that DITSMC has better performance than the PI controller in terms of the settling time and thus the efficiency of the WECS.

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In this paper, a new single phase inverter is proposed. The proposed inverter topology is obtained through modifying the well-known DC-DC buck converter to produce sine wave alternative voltage at the output. Thus, the peak value of the alternative output voltage can be provided lower than the input direct voltage value. The inverter is designed for producing alternative voltage at the output in the frequency range of 0-50 Hz. PI feedback controller is used for the control of the inverter operation. A simulation study is done for the proposed inverter and its operation in MATLAB-Simulink in order to prove its accuracy on different operation conditions. The results demonstrate that the proposed inverter can accurately produce nearly sine wave alternative voltage in various frequencies with low THD values on different operation conditions.

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