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access icon openaccess Operation and transient performance of a four-terminal MMC based DC grid implementing high power mechanical DC circuit breaker

This is an open access article published by the IET under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Received 26/10/2018, Accepted 10/01/2019, Published 15/03/2019

Recently, there has been significant interest in developing the modular multilevel converter (MMC) based DC grids in the power industry. However, the immature DC circuit breaker (DCCB) technology hampers the development of DC grids in overhead lines transmission field. The full controlled power electronic devices based hybrid DCCB has been proposed and researched substantially. But the hybrid type DCCB suffers from the drawback of high cost and low reliability, leading to high capital cost for DC grids that require numerous DCCBs. In this paper, a mechanical type DCCB, consisting of a mechanical switch, a circuit and an oscillation circuit, is proposed. Then, a four-terminal bipolar MMC-HVDC system implementing the mechanical DCCBs is studied. Extensive simulations have been conducted to analyse the transient performance under different fault conditions. The simulation results verify the technical feasibility of this mechanical DCCB in DC grid.

Inspec keywords: HVDC power transmission; power electronics; power grids; power transmission control; circuit breakers; HVDC power convertors; fault diagnosis; power overhead lines

Other keywords: mechanical type DCCB; controlled power electronic devices; high capital cost; hybrid type DCCB suffers; power industry; immature DC circuit breaker technology; high power mechanical DC circuit breaker; transient performance; four-terminal MMC based DC grid; four-terminal bipolar MMC-HVDC system; mechanical DCCB; hybrid DCCB

Subjects: Switchgear; d.c. transmission; Power system control; Control of electric power systems; Overhead power lines

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