Paper Info
Title
Transient Stability and Current Injection Design of Paralleled Current-Controlled VSCs and Virtual Synchronous Generators
Abstract
With development of power electronic technology, the paralleled current-controlled voltage source converters (CCSs) and virtual synchronous generators (VSGs) system has advantages in providing power and voltage/frequency regulation at the same time in rural area or remote island. However, the paralleled system faces great challenges in safe and stable operation due to their limited thermal capacity and weak anti-disturbance ability, especially during fault periods. This article focuses on transient stability and stability-oriented control design of the paralleled CCS-VSG system. First, mathematical model of the paralleled system is established and then the effect of two kinds of CCSs' current injection angle (active current and reactive current) on VSG's transient stability has been revealed through extended equal area criterion. Based on the theoretical analysis results, transient stability improvement control is put forward by controlling the CCS to track the VSG's frame. Compared with the conditions that only active- or reactive current is provided by the CCS, the system can achieve the best transient performance when the proposed control is adopted. Moreover, the effect of CCS's capacity on transient stability of the VSG has also been discussed. Finally, both Lyapunov's method and simulation/experimental results are provided to validate the correctness of theoretical analysis.
Year
DOI
Venue
2021
10.1109/TSG.2020.3032610
IEEE Transactions on Smart Grid
Keywords
DocType
Volume
Current-controlled voltage source converter (CCS),virtual synchronous generator (VSG),paralleled system,transient stability,Lyapunov’s method
Journal
12
Issue
ISSN
Citations 
2
1949-3053
1
PageRank 
References 
Authors
0.37
0
7
Name
Order
Citations
PageRank
Chao Shen111.05
Zhikang Shuai27616.06
Yang Shen324.10
Yelun Peng4123.42
Xuan Liu529738.07
Zuyi Li6308.94
Z. John Shen7527.88