Title: Harmonic compensation and closed-loop control for single-phase metre calibration power supply

Authors: Fuzhuan Wu; Manman Li; Shengjun Wen; Yongsheng Zhu

Addresses: College of Electric and Information Engineering, Zhongyuan University of Technology, No. 41 Zhongyuan Road, Zhengzhou, Henan Province, 450007, China ' College of Electric and Information Engineering, Zhongyuan University of Technology, No. 41 Zhongyuan Road, Zhengzhou, Henan Province, 450007, China ' College of Electric and Information Engineering, Zhongyuan University of Technology, No. 41 Zhongyuan Road, Zhengzhou, Henan Province, 450007, China ' College of Electric and Information Engineering, Zhongyuan University of Technology, No. 41 Zhongyuan Road, Zhengzhou, Henan Province, 450007, China

Abstract: This paper proposes a three-closed-loop control strategy based on harmonic compensation to address the requirements of voltage and current sources with wide output ranges and low harmonic content in metre calibration power supply. Firstly, a root mean square (RMS) value controller is designed in outer loop to control the output voltage and current. Then, a harmonic compensator in the instantaneous value middle loop is combined with a proportional-integral controller in the inductor current inner loop to suppress disturbances between the power supply and the load, as well as reduce the increase in harmonic content caused by factors such as inductor saturation, dead time settings, and transformer magnetic saturation. Also, a phase closed-loop regulator based on over-frequency sampling is investigated to ensure precise regulation of the phase in voltage and current sources, which optimises the selection of the zero-crossing point by increasing the A/D sampling frequency and applying closed-loop regulation to the phase difference between the voltage and current sources and a given value. Finally, the effectiveness of the proposed control strategy is verified through MATLAB/Simulink simulation and a prototype system with DSP28335.

Keywords: harmonic compensation; three closed-loop control; over-frequency sampling; closed-loop phase control; root mean square; RMS.

DOI: 10.1504/IJAMECHS.2026.150497

International Journal of Advanced Mechatronic Systems, 2026 Vol.13 No.1, pp.33 - 45

Received: 05 Oct 2024
Accepted: 05 Mar 2025
Published online: 15 Dec 2025 *

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