Voltage stability analysis of multi-infeed HVDC systems

With the increased use of HVDC transmission systems in power systems, situations have arisen and will be even more frequent in the future, where several HVDC systems are located in the vicinity of each other. It is evident that interactions between the different HVDC systems will occur in such configurations, and it is of importance to analyze such systems in a systematic way to ensure that there are no risks of adverse interactions. A method of analysis to cope with this task is presented and motivated in this paper. This method is demonstrated by application to a system with dual HVDC converters, and using the identified factors influencing the interactions, its practical realization is also illustrated.