An Improved Hybrid DC Circuit Breaker with Battery Banks for Energy Storage in HVDC System

High voltage direct current (HVDC) power system is gaining popularity over high voltage alternating current (HVAC) systems in the area of power distribution and transmission based on their performance, reliability, efficiency, and integration with renewable. Despite its many advantages, one of the most difficult aspects of using DC is breaking its DC current, because, unlike AC, DC does not have zero-crossing. The situation becomes more worst when the source is inductive in nature. As network inductance resists a quick shift in the current. Conventional hybrid dc circuit breaker (HDCCB) topologies handle this problem by dissipating the network inductance's energy or regenerating this energy and sent back to the DC source. Moreover, previous work was limited to DC sources. However, in this paper, battery banks are introduced to store this regenerative energy of the network inductance of HDCCB irrespective of the nature of the source. Be it AC or DC. A more flexible and realistic scenario is presented and tested in the HVDC grid. In which AC source is generating power sending to HVDC transmission lines through rectifier and store that regenerated energy in battery banks during DC fault. The proposed topology has an edge over existing circuit breaker topologies, owing to battery banks that can store this regenerative energy into storage elements for future use. In addition, this topology is tested in a 500kV HVDC transmission system which will improve the overall performance of the HVDC grid. The entire system is simulated using the MATLAB/SIMULINK platform.