Dear Colleagues,

The Special Issue “Fault Analysis and Protection Schemes for Multi-Terminal HVDC Transmission Networks” calls for papers dealing scientifically and technically with protection schemes for high-voltage DC transmission networks. Over the last couple of decades, the advancement and integration of renewable energy sources into power systems has become obligatory in order to meet the increasing energy demands and continuous depletion of fossil fuels. Most of the recommended future projects based on offshore wind farms will be located significantly far away from the load centers. Moreover, the medium- and long-term ambitious targets for the installation of renewable power plants will also require a substantial amount of DC connections. Different studies have found that the use of traditional HVAC transmission to interconnect the renewable energy sources and load center, becomes more expensive as the distance increases, and would ultimately become infeasible beyond a particular distance. Multi-terminal HVDC is expected to be recognized in the development of future energy projects. DC faults are considered as the major limitations in the development of MTDC networks. There are additional challenges in terms of the classification of faults and selective isolation of faulty parts of large networks in a short period of time. Overall, proficient techniques for network analysis and novel protection schemes would be adopted for the efficient deployment of flexible HVDC networks. The focus of this Special Issue includes (but is not limited to):

• Multi-terminal/meshed HVDC transmission networks;
• Integration of renewables using HVDC;
• HVDC grids;
• DC fault analysis;
• Adoptive protection and protection schemes;
• Modeling of relay;
• Localization of high-impedance faults;
• Hybrid HVDC (e.g., VSC–LCC–DR (diode rectifier));

MMCs (half bridge/full bridge/mixed arm/novel MMC).

Dr. Muhammad Haroon Nadeem
Prof. Dr. Nengling Tai
Prof. Dr. Tomonobu Senjyu
Guest Editors

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• fault detection 
• fault classification
• fault location
• HVDC protection
• HVDC transmission network 
• grid protection 
• hybrid DC breaker 
• renewable energy 
• grid integration 
• multi-terminal DC grids 
• line commutated converter (LCC) 
• voltage source converter (VSC) 
• modular multi-level converter (MMC)