scholarly journals Nyquist Stability Analysis of an AC-Grid Connected VSC-HVDC System Using a Distributed Parameter DC Cable Model

2016 ◽  
Vol 31 (2) ◽  
pp. 898-907 ◽  
Author(s):  
Yujiao Song ◽  
Claes Breitholtz
Keyword(s):  
Stability Analysis ◽  
Distributed Parameter ◽  
Cable Model ◽  
Hvdc System ◽  
Nyquist Stability

scholarly journals Small-Signal Stability Criteria in AC Distribution Systems—A Review

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 216 ◽  
Author(s):  
Atta Rahman ◽  
Irtaza Syed ◽  
Mukhtar Ullah
Keyword(s):  
Stability Analysis ◽  
Distribution Systems ◽  
Phase System ◽  
Small Signal ◽  
Small Signal Stability ◽  
Distribution Grid ◽  
Signal Stability ◽  
Synchronous Reference Frame ◽  
Nyquist Stability ◽  
Analytical Tools

AC distribution grid is prone to instability due to negative impedance and constant power nature of the load if it is dominant with power electronics-based components. There are various time-domain and frequency-domain modelling methods which use various methodologies and analytical tools. Also, there are many small-signal stability analysis (SSSA) methods and their different variants for different specific conditions and situation. This paper presents a review of SSSA methods in AC distribution grid using impedance-based models in a synchronous reference frame (SRF). By simplifying and converting the system into load and source subsystem, the impedances of both subsystems are determined by perturbation method. For a single-phase system, Hilbert transform can be used to derive the equivalent SRF model. Afterwards, the Nyquist stability criterion can be used for stability analysis.

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