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Energies 2018, 11(9), 2354;

A Compound Controller Design for a Buck Converter

School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
School Key Laboratory of Facility Agriculture Measurement and Control Technology and Equipment of Machinery Industry, Jiangsu University, Zhenjiang 212013, China
Author to whom correspondence should be addressed.
Received: 24 July 2018 / Revised: 3 September 2018 / Accepted: 4 September 2018 / Published: 6 September 2018
(This article belongs to the Special Issue Communications in Microgrids)
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In order to improve the performance of the closed-loop Buck converter control system, a compound control scheme based on nonlinear disturbance observer (DO) and nonsingular terminal sliding mode (TSM) was developed to control the Buck converter. The control design includes two steps. First of all, without considering the dynamic and steady-state performances, a baseline terminal sliding mode controller was designed based on the average model of the Buck converter, such that the desired value of output voltage could be tracked. Secondly, a nonlinear DO was designed, which yields an estimated value as the feedforward term to compensate the lumped disturbance. The compound controller was composed of the terminal sliding mode controller as the state feedback and the estimated value as the feedforward term. Simulation analysis and experimental verifications showed that compared with the traditional proportional integral derivative (PID) and terminal sliding mode state feedback control, the proposed compound control method can provide faster convergence performance and higher voltage output quality for the closed-loop system of the Buck converter. View Full-Text
Keywords: terminal sliding mode; DC-DC converter; disturbance observer terminal sliding mode; DC-DC converter; disturbance observer

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Sun, Y.; Ma, L.; Zhao, D.; Ding, S. A Compound Controller Design for a Buck Converter. Energies 2018, 11, 2354.

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