Recently, the applications of MMC (Modular Multilevel Converter) topology to STATCOMs (Static synchronous Compensators), which are self-commutated reactive power compensators, have been reported. An MMC consists of multiple sub-modules in series, which are small converters, and control voltages equivalent to voltage references calculated by VSCC (Voltage Sourced Converter Controller). Since MMC-ST...Show More
This paper describes a capacitor voltage control method of a modular multi-level cascade (MMC) converter configuring delta connection for a STATCOM. Each converter cell has its capacitor in DC-side, therefore this circuit configuration requires controlling the capacitor voltage level individually. Especially, controlling the voltage of each phase is important because the grid voltage can be a sudd...Show More
