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H∞ Controller Design for Robust Control in MMC-HVDC System

Eun-Sung Gil, Hui Song, and Kwan-Ho Chun
Chungnam National University, Daejeon, Korea

Abstract— In this paper, a Modular–Multilevel–Converter based high voltage direct current (MMC-HVDC) system is considered. It is assumed that the grid is strong. The effects of load change and, PLL errors can cause voltage, current, and active/reactive power changes on the grid side. It is assumed that active/reactive power and q-axis voltage are disturbances. Based on the H∞ theory, a robust controller is designed to deal with external disturbances. Purpose of controller maintains active/reactive power at the inverter station. The designed H∞ controller is validated by a simulation using MATLAB/Simulink.
 
Index Terms—MMC-HVDC system, Strong Grid, H∞ control, PLL

Cite: Eun-Sung Gil, Hui Song, and Kwan-Ho Chun, "H∞ Controller Design for Robust Control in MMC-HVDC System," International Journal of Mechanical Engineering and Robotics Research, Vol. 6, No. 2, pp. 104-107, March 2017. DOI: 10.18178/ijmerr.6.2.104-107

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