Abstract: This paper proposes an adaptive robust control strategy for voltage source dc/ac converter interfaced with the grid for harnessing renewable energy using discrete sliding mode control (DSMC). In the proposed method, the Euler’s first order approximation method is used for obtaining the discrete plant model. This model retains matched uncertainties to matched uncertainties. The proposed approach uses adaptive control to get fast convergence without overshoot. The explicit adaptive nature of the control law ensures lower control energy. The power quality is improved with a smaller total harmonic distortion. The proposed method rejects the system disturbances and uncertainties. Use of stationary reference frame avoids the rotating co-ordinate transformation and the angular information of grid voltage or virtual flux is not required. Extra current loops are not needed which leads to simple design. Further, the performance of the proposed algorithm is compared with the conventional look up table (LUT), DPC method and the superiority of the proposed controller is exhibited.
Keywords: Discrete sliding mode control, direct real and reactive power regulation, dc to ac converters, renewable energy applications.
Title: Adaptive Robust Control of DC/AC Converter for Renewable Energy Applications Using Discrete Sliding Mode
Author: U. M. Mate, V. N. Pande, Shailaja Kurode
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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