Decomposition control system to suppress the fluctuating voltage of a weak grid connected with a mega wind farm

Author(s): Aroun Sanelatha, Ken Nagasakab
a Electrical and Electronic Engineering Department, Tokyo University of Agriculture and Technology, Tokyo, Japan
b Supervisor Professor of Graduate School of Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
International Journal of Smart Grid and Clean Energy, vol. 11, no. 1, January 2022: pp. 41-48
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.11.1. 41-48

Abstract: Clean energy such as wind power has rapidly grown over decades. However, unstable output of wind farm (WF) causes the fluctuating voltage and reactive power shortage problem that directly affects security and stability of the grid when a mega WF is connected to a weak grid. The goal of this research is to suppress voltage fluctuation and reactive power shortage of a weak grid. MATLAB/Simulink is implemented as a simulation platform. In addition, the penetration limits of WF to power grid (IEEE 30 Bus Test System) was investigated. As a result, 9 out of 30 buses are available for Mega WF. Furthermore, in this paper, the decomposition method using time delay to send 54 MW of WF to a weak grid was carried out. PQ inverter and STATCOM were also implemented into the control system to compensate the reactive power and enhance the stability of a weak power system. As a consequence, 54 MW of WF was successfully able to transmit to a weak grid by implementing the approach mentioned above.

Keywords: Decomposition approach, STATCOM, mega wind farm, weak grid, IEEE 30 Bus Test System
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