AUTHOR=Ma Junchao , Wu Zhe , Sun Ke , Wang Chenxu , Lu Chengyu , Gu Yilei , Liu Jianing , Zhu Chengzhi , Guo Hanlin , Zhang Zheren , Xu Zheng 

TITLE=Research on variable pairing scheme for V/f controlled MMC station

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 12 - 2024

YEAR=2024

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2024.1400285

DOI=10.3389/fenrg.2024.1400285

ISSN=2296-598X

ABSTRACT=The grid-forming control is a promising solution for renewable power integration. In this paper, the variable pairing scheme for the voltage controller of grid-forming modular multilevel converter (MMC) in islanded network with synchronous machine is studied, based on V/f control which is a special type of grid-forming control. According to the concept of the relative gain array (RGA), it is found out that RGA matrix can be derived based on steady-state sensitivity analysis. Then, the steady-state characteristics of typical electrical components in the islanded network are considered, and the analytical expression for calculating the RGA matrix is derived. Based on a typical system, a variable pairing scheme is suggested by the calculated RGA matrix elements. The time-domain simulation is carried out in PSCAD/EMTDC, and the simulation results verify feasibility and the advantage of the suggested variable pairing scheme.