Double-Thyristor-Based Protection for Valve-Side Single-Phase-to-Ground Faults in HB-MMC-Based Bipolar HVDC Systems
| Autor: | Jun Liang, Ziming Song, Wei Liu, Gen Li, Tibin Joseph |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Computer science
business.industry Ground 020208 electrical & electronic engineering Electrical engineering Thyristor 02 engineering and technology Fault (power engineering) law.invention Capacitor Control and Systems Engineering Overvoltage law 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering business Electrical impedance Circuit breaker Voltage |
| Zdroj: | IEEE Transactions on Industrial Electronics |
| ISSN: | 0278-0046 |
| DOI: | 10.1109/tie.2019.2931502 |
| Popis: | The valve-side single-phase-to-ground (SPG) faults in the half-bridge modular multilevel converter (HB-MMC)-based bipolar high-voltage direct-current (HVdc) systems induce some special fault consequences: overvoltage on the submodule (SM) capacitors in converter upper arms and nonzero-crossing currents in the grid-side ac circuit breaker (ACCB). In this letter, a protection strategy based on converter-embedded double-thyristors is proposed to address these issues. The double-thyristors are installed in parallel with each SM in the lower arms of the converter. By triggering the double-thyristors, the SPG fault is converted into a three-phase short-circuit that ensures current zero-crossings in the grid-side ACCB. Moreover, as the voltages of converter ac buses are clamped by the ground through the triggered double-thyristors, the upper arm overvoltage is mitigated. The effectiveness of the proposed protection strategy has been verified in a bipolar HB-MMC HVdc link built in PSCAD/EMTDC. |
| Databáze: | OpenAIRE |
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