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1887

access icon free DC fault protection for modular multi-level converter-based HVDC multi-terminal systems with solid state circuit breakers

© The Institution of Engineering and Technology
Received 25/08/2017, Accepted 03/04/2018, Revised 09/03/2018, Published 09/04/2018

The high penetration of renewable energy requires flexible transmission of electrical energy over long distances. Onshore high-voltage DC (HVDC) interconnectors based on overhead transmission lines have already reached an advanced planning stage. These interconnectors could be extended to multi-terminal grids in the second step for higher transmission redundancy and flexibility. Fast and selective protection concepts for fault handling are required to ensure high reliability and continuous operation of these systems. Modular multi-level converters with submodules in half-bridge topology and solid-state HVDC-circuit breakers (SSCB) provide fault clearing within several microseconds to prevent converter blocking. Within this publication, a selective protection concept for SSCB and multi-terminal HVDC systems based on the overhead transmission is developed and analysed. It is based on a combination of local voltage and current signals and does not require communication between grid nodes. Additional series reactors for limiting rising fault currents are not required. Subsequent simulations for validating the protection concept and identifying its limits are carried out in power systems computer-aided design™/electro-magnetic transient design and control™ for an exemplary HVDC system. The combination of overcurrent protection with additional excitation signals enables selective fault clearing for all types of line fault scenarios.

Inspec keywords: HVDC power convertors; power transmission faults; power system interconnection; power overhead lines; fault currents; circuit breakers; power grids; HVDC power transmission; power transmission protection; power transmission planning

Other keywords: SSCBs; limiting rising fault currents; modular multilevel converter-based HVDC multi-terminal systems; fault handling; converter blocking; reliability; advanced planning stage; DC fault protection; power systems computer-aided design; multiterminal HVDC systems; solid-state HVDC-circuit breakers; transmission redundancy; fault clearing; local voltage-current signals; selective protection concepts; electromagnetic transient design and control; multiterminal grids; overcurrent protection; onshore high-voltage DC interconnectors; half-bridge topology; grid nodes; renewable energy penetration; overhead transmission lines

Subjects: Overhead power lines; Power system protection; Power system planning and layout; AC-DC power convertors (rectifiers); d.c. transmission; DC-AC power convertors (invertors); Switchgear

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