Modular Multi-Level Converter Based T-STATCOM

This project deals with the design methodology for modular multilevel converter (MMC) -based transmission-type STATCOM (T-STATCOM). Sizing of the MMC module, the number of H-bridges (HBs) in each phase of the MMC, ac voltage rating of the MMC, the number of paralleled MMC modules in the T-STATCOM system, the optimum value of series filter reactors, and the determination of bus bar in the power grid to which the T-STATCOM system is going to be connected, current status of high voltage (HV) insulated gate bipolar transistor (IGBT) technology, and the required reactive power variation range for the T-STATCOM application. The equalization of dc-link capacitor voltages is achieved according to the modified selective swapping (MSS) algorithm. An L-shaped laminated bus has been designed and the HV IGBT driver circuit has been modified for the optimum switching performance of HV IGBT modules. The simulation is carried over by the MATLAB-SIMULINK software