Power systems
Mehdi Bekrani; Mojtaba Heydari; Seyedeh Tahereh Behrooz
Abstract
In this paper, a new adaptive control method is proposed for direct matrix converters. The proposed method uses interval type-2 fuzzy logic integrated with sliding mode control. Employing the sliding mode control in matrix converters leads to an efficient choice of switching combinations and a reliable ...
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In this paper, a new adaptive control method is proposed for direct matrix converters. The proposed method uses interval type-2 fuzzy logic integrated with sliding mode control. Employing the sliding mode control in matrix converters leads to an efficient choice of switching combinations and a reliable reference tracking. The main problem of the sliding mode control is the chattering phenomenon that degrades the controller performance through injecting high-frequency variations in the controller variables. The proposed method incorporates the interval type-2 fuzzy with the sliding mode control to mitigate the chattering problem. The sliding mode switch surface can be adjusted adaptively according to the system state and the proposed fuzzy compensation based on the Lyapunov stability theorem, so that the control system has the characteristics of low chattering effect and appropriate operation quality. Comprehensive evaluations of the waveforms are conducted for the new matrix converter through various simulations. Simulation results verify the effectiveness of the proposed adaptive control method for matrix converter in various conditions, and its superiority in chattering suppression in comparison to the conventional sliding mode control and the boundary layer method.
Industrial Electronics
Hossein Shojaeian; Saeed Hasanzadeh; Mojtaba Heydari
Abstract
AbstractThis paper proposes a novel high step-up converter suitable for distributed generation using renewable power sources. The proposed converter includes a dual switches structure, two voltage multiplier cells and a three-windings coupled inductor for achieving high voltage gain. The configuration ...
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AbstractThis paper proposes a novel high step-up converter suitable for distributed generation using renewable power sources. The proposed converter includes a dual switches structure, two voltage multiplier cells and a three-windings coupled inductor for achieving high voltage gain. The configuration of the proposed converter not only reduces the voltage and current stresses of the switches, but also restricts the input source current, which reduces transmission losses and increases the lifetime of the input source. In the proposed converter, the multiplier cells are charged during the switch-on and switch-off periods, which cause to enhance the voltage gain of the converter and improve its productivity. Another feature of the proposed converter is that the inductive leakage energy of the coupled inductor is recycled through a passive clamping circuit which, in turn, has a considerable impact on system efficiency. A comparison is conducted between the performance of the proposed converter and the counterpart converters to demonstrate the proposed converter’s superiority in terms of voltage gain, voltage stress across the switches and diodes and number of components. Theoretical analysis and simulation results are provided to demonstrate the authenticity of the proposed converter.