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...
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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-timecontroller 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-timeintegralslidingmode 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 slidingmodecontroller 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.
This work presents a comparative study of two approaches for design of high performance discrete-time velocity servo systems with induction motors (IMs). The first approach uses the conventional proportional-integral ...
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This work presents a comparative study of two approaches for design of high performance discrete-time velocity servo systems with induction motors (IMs). The first approach uses the conventional proportional-integralcontroller with one-step delayed disturbance compensator (OSDC). The OSDC is based on measurements of the control input and plant states. The second approach uses the discrete-timeintegralslidingmode (DISM) controller with a first-order disturbance compensator, which is based on switching function signal measurement only. The controlled plant, consisting of IM in the commonly used indirect field-oriented control (IFOC) scheme, is approximated by first-order dynamic model for control design purpose. Comparisons are conducted through simulations considering an ideal case (without unmodelled dynamics) and a regular one, using MATLAB/Simulink models of real IFOC structure elements. The experimental investigation is conducted as well. The performed tests show that both controllers enhanced with the corresponding disturbance compensators are suitable for high-performance control systems design if speed measurement is near noise-free case, with better performance from DISM. If Euler backward difference is applied for speed detection, both control systems need some retuning in order to make a compromise between chattering and tracking accuracy.
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