The number of power system configurations with two or more HVDC links feeding power to different points in the same AC network area is increasing as the total number of HVDC links in the world increases. This gives rise to a greater interest in studying the performance of such applications. A very special and extreme case of multi-infeed is the asynchronous interconnection of the Scandinavian (the NORDEL) network to Continental Europe, today by 6 cable poles, but probably using more poles in the future.A number of technical aspects specifically related to multi-infeed configurations must be considered:1. Is coordination of recovery control needed?2. How can DC power modulation for stabilization beestablished?3. Infeed by two or more DC transmissions to one and thesame AC network area often means that a large amount ofpower is fed into a network that is relatively weak, thusrisking voltage instability.4. The consequence of feeding a large iimount of power intoa weak network must be considered.5. How effective is the electrical separation between invertersin reducing the risk of mutual commutation failures?
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