Supplementary frequency regulation in non-synchronous AC system connected via MTDC

Further, effectiveness of derivative based virtual inertia (VI) is also demonstrated to fully compensate the initial frequency response. It is shown that variation of turbine power, i.e. its contribution towards power balance remains minimum with inclusion of voltage droop based lead/lag compensator or/and DC power modulation technique(s). Finally, the comparison between the above control schemes is also discussed. It is indicated that the frequency deviation remains minimum using combined control scheme.