access icon openaccess Design of DC-line terminating inductors for enhancement of protective functions in MTDC grids

This study presents a detailed DC-side fault analysis considering inductive termination of lines within a high-voltage multi-terminal direct current (MTDC) grid. The analysis aims to provide design guidelines for DC-side inductors, taking into account important aspects of protection such as the required speed of operation of relays and the performance characteristics of current interruption devices (i.e. of DC circuit breakers). Moreover, the impact of current limiting inductors on the fault signatures is investigated. In particular, it has been found that DC-side inductors not only limit the fault current level, but also the resulting signatures in voltage and current, can assist to enhance the speed of operation, stability and selectivity of protective functions for DC-side faults. The analysis has been extended to include the impact of inductive termination on fast transient phenomena known as travelling waves. Specifically, DC-side inductors can form a significant reflection boundary for the generated travelling waves. A deeper insight into the faults has been achieved by utilising wavelet transform.

Inspec keywords: HVDC power transmission; power transmission protection; fault diagnosis; power transmission faults; power grids; fault currents; inductors; current limiters; wavelet transforms; circuit breakers; power overhead lines

Other keywords: DC-line terminating inductors; inductive termination; design guidelines; fault signatures; high-voltage multiterminal direct current grid; DC-side inductors; fault current level; MTDC grids; current interruption devices; current limiting inductors; detailed DC-side fault analysis; protective functions; DC circuit breakers

Subjects: Power engineering computing; Power system protection; Switchgear; Integral transforms

http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2018.0266
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content/journals/10.1049/joe.2018.0266
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