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Electronics 2016, 5(4), 68; doi:10.3390/electronics5040068

A Multi-Slope Sliding-Mode Control Approach for Single-Phase Inverters under Different Loads

Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad 8514143131, Iran
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Author to whom correspondence should be addressed.
Academic Editor: Bimal K. Bose
Received: 18 July 2016 / Revised: 28 September 2016 / Accepted: 7 October 2016 / Published: 14 October 2016
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Abstract

In this paper, a new approach to the sliding-mode control of single-phase inverters under linear and non-linear loads is introduced. The main idea behind this approach is to utilize a non-linear, flexible and multi-slope function in controller structure. This non-linear function makes the controller possible to control the inverter by a non-linear multi-slope sliding surface. In general, this sliding surface has two parts with different slopes in each part and the flexibility of the sliding surface makes the multi-slope sliding-mode controller (MSSMC) possible to reduce the total harmonic distortion, to improve the tracking accuracy, and to prevent overshoots leading to undesirable transient-states in output voltage that occur when the load current sharply rises. In order to improve the tracking accuracy and to reduce the steady-state error, an integral term of the multi-slope function is also added to the sliding surface. The improved performance of the proposed controller is confirmed by simulations and finally, the results of the proposed approach are compared with a conventional sliding-mode controller (SMC) and a synchronous reference frame PI (SRFPI) controller. View Full-Text
Keywords: multi-slope sliding-mode control (MSSMC); single-phase inverter; multi-slope function (MS) multi-slope sliding-mode control (MSSMC); single-phase inverter; multi-slope function (MS)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Khajeh-Shalaly, B.; Shahgholian, G. A Multi-Slope Sliding-Mode Control Approach for Single-Phase Inverters under Different Loads. Electronics 2016, 5, 68.

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