标题：Inertia and Primary Frequency Provisions of PLL-Synchronized VSC HVDC When Attached to Islanded AC System

作者：张美清; ;胡家兵

摘要：The islanded scenarios of voltage source converter (VSC) high-voltage DC (HVDC) directly supplying power to islanded loads or connecting to wind farm are becoming popular, in whichsomenewissuesarerequiredtobefurtheraddressed.While several control strategies have been studied, to the authors’ best knowledge, few have investigated the potential capability of VSC HVDC using the typical phase-locked loop (PLL)-synchronized vector control (PLLSynVC) to address islanded operation issues. To explore the potential capability of the typical PLLSynVC in islanded system, this paper proposes a frequency regulation scheme (FRS), including inertia and primary frequency control, for the PLL-synchronizedVSCHVDCbasedonthemotionequationconcept. By adding the FRS, the VSC HVDC using the PLLSynVC, similartoasynchronousgeneratorfromtheviewofthephasemotionequation,notonlycanself-maintainthefrequencystableinan islanded system, but also naturally avoids the transition of control operationmodeswithoutchangingthebasiccontrolstructure.Furthermore, based on the developed phase motion equation, the inertia characteristics of VSC HVDC with theFRS is studied,which syntheticallyconsiderstheimpactofdifferentcontrollersandPLL, and makes VSC HVDC’s manifested inertia clear. The effectiveness of FRS and inertia analysis results is verified by time-domain simulations.

发表于：IEEE TRANSACTIONS ON POWER SYSTEMS

发表时间：JUL, 2018