A new topology of the distributed power flow controller and its electromagnetic transient characteristics

In this paper, the modular multilevel converter (MMC) is introduced into the shunt side of the distributed power flow controller (DPFC), and a new topology of distributed power flow controller is constructed. The mathematical models are developed, in these models the internal energy relationship between the MMC module and the single-phase converter in the shunt side, as well as between the shunt-side single-phase converter and series-side single-phase converter are considered, and the corresponding control strategies are proposed based on the mathematical models. The internal electromagnetic transient characteristics of the MMC based DPFC are studied in PSCAD/EMTDC. The simulation results show that the MMC based DPFC is able to adjust the control variables such as voltage amplitude, phase angle and line reactance of the power system individually or simultaneously, and also the DPFC is able to respond to the power flow regulation demand effectively.