Small-Signal Dynamic Analysis of LCC-HVDC with STATCOM at the Inverter Busbar

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Liu, Dong^2 ; Jiang, Wen^1 ; Guo, Chunyi^1 ; Rehman, Atiq Ur^1 ; Zhao, Chengyong^1

School of Electrical and Electronic Engineering, North China Electric Power University, Beijing

102206, China^1

State Key Laboratory of Advanced Power Transmission Technology, Beijing

102209, China^2

关键词: AC voltage controller;    AC voltage controls;    Line commutated converter based hvdc (LCC-HVDC);    Phase Locked Loop (PLL);    Small signal dynamics;    Small signal model;    Small signal stability;    Time domain response;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/5/052078/pdf
DOI  :  10.1088/1755-1315/108/5/052078

来源: IOP

【 摘 要 】

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.