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Title: Research on static reactive power generator based on asymmetric distribution network

Authors: Fuzhuan Wu; Shengjun Wen; Sheng Peng

Addresses: Department of Electrical and Information Engineering, Zhongyuan University of Technology, No. 41 Zhongyuan Road, Zhengzhou, Henan Province, 450007, China ' Zhongyuan-Peterburg Aviation College, Zhongyuan University of Technology, No. 41 Zhongyuan Road, Zhengzhou, Henan Province, 450007, China ' Department of Electrical and Information Engineering, Zhongyuan University of Technology, No. 41 Zhongyuan Road, Zhengzhou, Henan Province, 450007, China

Abstract: Negative or zero sequence components are generated when the voltage is asymmetric or harmonic in distribution networks. Meanwhile, the decoupling process of traditional dq transform is complex. To solve the above problems, firstly, the T/4 delay method (T is the period of grid voltage) is presented to separate positive and negative sequence components, which improves the stability of software phase-locked. Then, software phase-locked loop (SPLL) is designed to ensure the instantaneity of reactive current check. Besides, a double-loop control scheme combining proportional integral (PI) controller for DC voltage in outer loop and proportional resonance (PR) controller for AC current in inner loop without decoupling is designed by considering the characteristics of traditional PI and PR without static error regulation. It avoids the complicated decoupling process and improves the real-time performance of the system. Finally, both simulation and experimental results are given to verify the feasibility of design scheme in the static var generator (SVG) system by MATLAB/Simulink and experimental platform based on DSP28335.

Keywords: static reactive power generator; asymmetrical distribution network; PR controller; software phase-locked loop; SPLL.

DOI: 10.1504/IJAMECHS.2020.109885

International Journal of Advanced Mechatronic Systems, 2020 Vol.8 No.1, pp.1 - 8

Received: 27 Nov 2018
Accepted: 12 Mar 2019

Published online: 15 Sep 2020 *

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