Authors : Vikash Anand and S. K. Mallik
Abstract: The Distributed Power Flow Controller (DPFC) is a latest device in the FACTS family which has emerged from the UPFC and has a high reliability and relatively low cost. Two types of converters present in the DPFC are shunt and series which are connected to grids. A common DC link is present between the shunt and the series converter which is eliminated. Unlike the UPFC where in the active power exchange is through the common DC link, the active power exchange between the shunt and series converters is through the transmission line at the 3rd harmonic frequency. A high reliability of the system is provided by the redundancy of the series converters. The DPFC behaviour during the single series converter unit failure is considered is discussed in this study. In order to improve the performance of the DPFC during the failure a control scheme is proposed which is based on the principle that the single series converter failure will result into unsymmetrical current at the fundamental frequency. The series converter failure is compensated by controlling the negative and zero sequence current to zero. The control system is simulated in MATLAB environment and the results are presented to highlight the effectiveness of the proposed control scheme.
Vikash Anand and S. K. Mallik, 2019. Introducing Supplementary Control Scheme to DPFC During Series Converter Failure. Journal of Engineering and Applied Sciences, 14: 2124-2134.