Multi-terminal HVDC System

This demo models a multi-terminal HVDC system. It includes eight 12-pulse valve groups with converter transformers, smoothing reactors and generic controls. There are three HVDC converter stations. One station has four 12-pulse valve groups (two bi-polar in parallel), and the other two stations have 2 12-pulse valve groups (one bi-polar) each. In each station, there are 15 3-phase AC filter sub-banks on the AC side and eight branches of filter banks on the DC sides (four at positive pole and four at negative pole) with breakers. The AC filter sub-banks are tuned to filter harmonics of 11th, 13th, and above 24th, and gives 15 tiers of VAR compensation. In each station, there are two simplified SVCs (Static Var Compensator), six synchronous generators along with their controls, and a grid source (represented by ideal source via an impedance), are connected to the AC systems.

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