Abstract
High-voltage direct current (HVDC) transmission system is commonly used for transmitting the bulk electric power over long distance and the reason behind this is, its less transmission losses and interconnection between two or more asynchronous power systems. Due to the recent advancement in power electronics devices, the terminal end converter and inverters cost is reduced and capacity is increased which makes the HVDC transmission more effective comparing with HVAC transmission over a long distance. The present scenario of HVDC in India is also given more attention due to more power demand and we have limited resources, it is being fulfilled by only through renewable energy resources, so the scope for HVDC transmission increases day by day. Most of the renewable energy resources generate energy at different frequency levels that fulfil the requirement of demand through islanded mode or connect through grid, it is an obvious option to connect renewable energy resources to grid via HVDC links. So, nowadays increasing HVDC links also increase the probability of fault in the system.
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