NDLI: Generalised dq-dynamic phasor modelling of a STATCOM connected to a grid for stability analysis

Content Provider	IET Digital Library
Author	Abojlala, Khaled Asad, Grain Ahmed, Khaled Holliday, Derrick Xu, Lie
Abstract	The synchronous d-q based small-signal stability using the eigenvalue analysis and impedance methods is widely employed to assess system stability. Generally, the harmonics are ignored in the stability analysis, and such assumption may lead to inaccuracies in the stability predictions, particularly, in harmonic-polluted ac grids. Typically, the harmonic state-space method (HSS) facilitates stability studies of linear time-periodic systems, which considers the impact of harmonics. The use of the d-q dynamic phasor state space and impedance methods offer significant advantages over the HSS counterpart, as they reduce system order, suitable for studying control systems, retain coupling between harmonics, and simplify the stability study under unbalanced conditions. This study extends dynamic phasor modelling for studying stability of modern power systems that include power converters. It is shown that the proposed methods reproduce the typical response of STATCOM at the fundamental frequency, as well as, in the presence of significant low-order harmonics, using both eigenvalues and impedance analysis. Quantitative validations of the proposed extended models against synchronous dq small-signal models confirm their validity.
Starting Page	720
Ending Page	731
Page Count	12
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 4, Mar (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.6366
Journal	IET Power Electronics
Publisher Date	2019-11-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control of Electric Power System Dynamic Phasor State Space Eigen Values And Eigen Function Eigenvalue Analysis Generalised Dq-dynamic Phasor Modelling Harmonic State-Space Method Harmonic-polluted AC Grid Harmonics HSS Counterpart Impedance Method Linear Algebra Linear System Linear Time-periodic System Low-order Harmonics Mathematical Analysis Numerical Analysis Other Power Apparatus And Electric Machine Periodic Control Power Converter Power Electronics Power Supplies to Apparatus Power Supply Power Supply Quality Power System Control Power System Harmonics Power System Stability Stability Analysis Stability in Control Theory STATCOM State Space Method Static VAr Compensators Supervisory Circuit Synchronous Dq Small-signal Stability System Order Reduction Time Domain Analysis Time Varying Control System
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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