However, this switching operation would cause serious problems for the broader electric grid, because it takes hundreds of megawatts if not gigawatts of electric demand off the grid in an instant. This in turn causes voltage and frequency fluctuations from the sudden imbalance between electric supply and demand, which then may cause other generators or large loads to trip offline in a cascading grid failure.
Oh wow, so insulating the DC from the change on voltage just moves the problem elsewhere