Multi terminal hvdc control methods and systems

Abstract

A method for controlling or operating High Voltage Direct Current (HVDC) converters within a multi-terminal HVDC system, multi-terminal HVDC systems implementing such controls, controllers and computer software for same. The outputs of the HVDC converters are controlled by providing each HVDC converter with a respective or converter specific DC voltage reference. A feedback signal is determined for each HVDC converter, and the converter specific feedback signals comprise a modification to the DC voltage reference for the respective converter. Determining the converter specific feedback signals comprises analysing terminal characteristics of each converter and determining an index indicative of a margin against loss of equilibrium, or modelling terminal characteristics of each converter as an equivalent circuit based on or representing the response of that HVDC converter to a modification of its voltage reference for a given operating state. HVDC converter terminal characteristics can include impedance, voltage droop, power, branch current and nodal voltage, etc.

Dependencies are inferred from the claim text.