Multiterminal HVDC systems present challenges in the specification and
design of suitable de side filtering, This document examines the exis
ting experience and addresses the particular technical problems posed
by multiterminal systems. The filtering requirements of small taps are
discussed, as is the potential use of active filters. Aspects of calc
ulation and design are considered and recommendations made to guide th
e planners and designers of future multiterminal schemes.