Extra transient block for virtual synchronous machine with better performance

An extra transient block (ETB) for virtual synchronous machine (VSM) that is able to provide extra transient damping and adjust transient inertial to better stabilise the frequency of the VSM in a shorter time during transient period without altering the steady-state performance is proposed in this...

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Bibliographic Details
Published in:IET generation, transmission & distribution transmission & distribution, 2020-04, Vol.14 (7), p.1186-1196
Main Authors: Pan, Rongcai, Sun, Peide
Format: Article
Language:English
Subjects:
damping
damping coefficient
distributed power generation
dynamic response
easier parameter design method
ETB‐based VSM
extra parallel series lead‐lag blocks
extra transient block
extra transient damping
inner reference frequency
power generation control
power system stability
Research Article
steady‐state performance
synchronous generators
synchronous machines
time‐domain analysis
transient frequency output
transient period
virtual inertial coefficient
virtual synchronous machine
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Summary:An extra transient block (ETB) for virtual synchronous machine (VSM) that is able to provide extra transient damping and adjust transient inertial to better stabilise the frequency of the VSM in a shorter time during transient period without altering the steady-state performance is proposed in this study. The ETB uses extra parallel series lead-lag blocks to get the transient frequency output to make the stability of the VSM less intensive to the parameter design of the virtual inertial and damping coefficient so that an easier parameter design method can be used. In other words, this method helps to solve the contradiction between dynamic response and stable performance, especially when the damping coefficient cannot be freely modified to increase damping for a large inertial value because of the mutual dependence between damping coefficient and droop coefficient caused by the use of inner reference frequency. Moreover, a simplified method for the parameter design of the ETB is proposed and the small-signal model of the ETB-based VSM is also derived. After that, the power coupling situation is analysed and comparisons with other control strategies are presented. Furthermore, time-domain simulation results are demonstrated to verify the effectiveness of the proposed method.
ISSN:1751-8687
1751-8695
1751-8695
DOI:10.1049/iet-gtd.2018.6990