VOLTAGE REGULATION IN MULTI-TERMINAL HVDC NETWORK

A method (100) for regulating voltage in a multi-terminal HVDC network system (1) is disclosed. The system comprises one or more converter stations (2). The method (100) involves a step (101) of measuring a local DC voltage at each of the participating converter stations (20), a step (102) of detecting an over-voltage condition when the local DC voltage crosses a predefined upper threshold voltage (10) or detecting an under-voltage condition when the local DC voltage crosses a predefined lower threshold voltage (11), a step (103) of triggering modification of an available DC power set value by the said converter station (10) on detection of the over-voltage or the under-voltage condition, wherein the DC power set value is modified based on a defined power ramp of defined steepness and a final step (104) of checking for termination of the modification step (103) when the over-voltage condition or the under-voltage condition no longer persists.