PROJECT TITLE :

Dual Channel Control with DC Fault Ride Through for MMC-based, Isolated DC/DC Converter - 2017

ABSTRACT:

This paper presents the two-channel controller with inner current loops for twin bridge, DC/DC converter, based on modular multilevel converter (MMC) technology. The DC/DC management strategy is based on two inner quick current control loops in dq rotating frame at every of the 2 MMC bridges. These current controls facilitate operation through dc faults at either dc bus. The active power control is shared by 2 MMCs, at the slower outer control level. The second outer management loop minimizes losses, which is achieved by feedback management of magnitude of each modulation indices at maximal worth of zero.ninety five in any respect loading levels. The controller is symmetrical, provides bidirectional power flow and responds equally to faults on either dc bus. Beneath dc fault conditions, one MMC actively controls the inner ac current, while temporary blocking of MMC on faulted facet is required to prevent cell capacitor discharge. The validity of the proposed control is verified on PSCAD using a 60zero MW, five hundred-kV/640-kV take a look at dc/dc model. The controller can be used for management/stability studies with massive dc grids that contain dc/dc converters.