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access icon openaccess Small-signal stability analysis for the multi-terminal VSC MVDC distribution network; a review

This is an open access article published by the IET under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 30/08/2018, Accepted 24/09/2018, Revised 12/09/2018, Published 23/10/2018

The stable operation and control of the proposed terrestrial multi-terminal Voltage Source Converter (VSC) medium voltage DC (MVDC) distribution network is a remarkable motivation towards developing the future universal DC grid interconnecting the low voltage DC systems on one side and the high voltage DC systems on the other. The small-signal stability analysis are important in designing these power electronic based systems (PEBS). In this study, small-signal stability approaches for PEBS are reviewed with the aim of identifying suitable methods for the proposed MVDC distribution network. It is established that the impedance-based methods are suitable for local stability analysis complementing very well with the state-space modelling-eigenvalue analysis method best for global stability analysis. The Lyapunov linearisation method offers simple, adaptable, and accurate small-signal and large-signal stability study. On the other hand, the bifurcation analysis is an emerging non-linear approach with promising efficiency and precision. In conclusion, there is no single small-signal stability criterion that encompass an acceptable level of accuracy, adaptability, and efficiency. Thus, the impedance-based methods combined with state-space modelling-eigenvalue analysis, Lyapunov linearisation, and bifurcation theory can be suitable small-signal stability approaches for the multi-terminal MVDC distribution network.

Inspec keywords: power distribution protection; power system stability; bifurcation; power grids; stability; distributed power generation; fault location; eigenvalues and eigenfunctions; power electronics; Lyapunov methods

Other keywords: multiterminal VSC MVDC distribution network; multiterminal MVDC distribution network; medium voltage DC distribution network; future universal DC grid; stable operation; state-space modelling-eigenvalue analysis method; global stability analysis; bifurcation analysis; local stability analysis; power electronic based systems; accurate small-signal; impedance-based methods; large-signal stability study; small-signal stability analysis; terrestrial multiterminal; suitable small-signal stability approaches; PEBS; Lyapunov linearisation method; single small-signal stability criterion; low-voltage DC systems; high-voltage DC systems

Subjects: Distributed power generation; Control of electric power systems; Power system control; Stability in control theory

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