Advanced HVDC control, Volume 4: Characterization and enhancement of HVDC system performance during unbalanced AC faults. Final report
Technical Report
·
OSTI ID:10191901
- General Electric Co., Schenectady, NY (United States). Power Systems Engineering Dept.
AC system faults are one of the most common transients to which dc transmission systems are exposed. The vast majority of ac faults are unbalanced in nature, primarily single-line-to-ground (SLG). The ability of dc transmission to transfer power during extended unbalanced ac faults is often an important factor when establishing power transfer limitations which assure system security. An important aspect of dc system response during unbalanced ac conditions is the existence of certain harmonics on both the ac and dc networks. As will be shown, the converter response to the unbalanced ac voltages transforms fundamental-frequency energy from the ac source to second harmonic on the dc network and third harmonic on the ac network. Resonance with the overall ac/dc network can lead to substantial amplification, with consequent high voltage or current. The effects of an unbalanced ac fault can also be transferred from one ac network to another via the dc line. The performance of the dc transmission system during inverter ac unbalanced faults is strongly influenced by the margin-angle regulator. The inverter`s ability to prevent commutation failures during modest ac unbalanced faults, and minimize commutation failures during more severe disturbances, indicates a good design. Moreover, tight regulation following the disturbance, with no commutation failures resulting from an oscillatory post-disturbance voltage, is also indicative of a reliable control design.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); General Electric Co., Schenectady, NY (United States). Power Systems Engineering Dept.
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 10191901
- Report Number(s):
- EPRI-TR--104227-V4; ON: UN95002167
- Country of Publication:
- United States
- Language:
- English
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