Small-Signal Dynamic Analysis of LCC-HVDC with STATCOM at the Inverter Busbar
Abstract
This paper develops a linearized small-signal dynamic model of a Line-Commutated-Converter based HVDC (LCC-HVDC) system with STATCOM at the inverter busbar, and validates its accuracy by comparing time-domain responses from small-signal model and PSCAD-based simulation results. Considering the potential impact of Phase-Locked-Loop (PLL) parameters on the study system and the close connection of STATCOM and LCC inverter station at AC busbar, this paper investigates the impact of PLL gains and AC voltage control parameters of STATCOM on the system small-signal stability. The studies show that (i) the PLL gain has highly impact on the study system and smaller PLL gains are preferable; (ii) larger values of both the proportional gain and the integral gain of AC voltage controller of STATCOM could result in oscillation/instability of the system.
- Publication:
-
IOP Conference Series: Earth and Environmental Science
- Pub Date:
- January 2018
- DOI:
- 10.1088/1755-1315/108/5/052078
- Bibcode:
- 2018E&ES..108e2078L