Vector analysis and performance evaluation of Modular Transformer Converter (MTC) based Convertible Static Transmission Controller

Modular Transformer Converter (MTC) is the building block to realize a versatile and transportable transmission controller which can perform several functions including power flow control for renewable resources transmission and transformer back-up for disaster management or life extension purposes. This structure has several advantages in comparison with conventional FACTS controllers. Modularity for manufacturers and utilities using standard high power electronic systems is one of the advantages of this structure. Different connecting configuration options (shunt-shunt, series-shunt, and series-series) can be obtained in the transmission controller with the MTC structures. These features allow them to be deployed dispersedly or aggregated to meet power, voltage, VAR and other power systems contingency requirements. In this paper, vector analysis of each mode to determine the operating characteristics of the proposed transmission controller is presented and compared to conventional FACTS controllers. The dynamic performance of the MTC system is further investigated in three different connecting configurations in PSCAD/EMTDC environment.