A5071714458- HVDC Systems and Fault Protection
- High-Voltage Power Transmission Systems
- Cardiac Structural Anomalies and Repair
- Microgrid Control and Optimization
- Advanced DC-DC Converters
Toshiba (United Kingdom)
2019-2020
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 submodule (SM) capacitors upper arms and nonzero-crossing currents grid-side ac circuit breaker (ACCB). In this letter, a protection strategy based converter-embedded double-thyristors is proposed to address these issues. are installed parallel with each SM lower of...
One of the most critical faults affecting modular multilevel converter (MMC) based bipolar high-voltage direct-current (HVDC) transmission systems is single-phase-to-ground (SPG) between transformer and valve. However, half-bridge (HB) full-bridge (FB) MMCs exhibit a different behavior following such fault and, thus, protection should be addressed in manner for each configuration. For HB-MMCs, an SPG at valve-side leads to severe overvoltage on submodule (SM) capacitors upper arms grid-side...
This paper describes an advanced LCC-HVDC model developed in PowerFactory for National Grid under the background of Western HVDC link UK. Unlike most models different simulation packages, this explicitly incorporates Automatic Filter Switching control and On-Load Tap Changer (OLTC) control. The automatic filter switching is designed to limit reactive power exchange between converter station connected AC system at all transfer levels be within acceptable range. OLTC dynamically firing angle...