TY - JOUR
T1 - Improving the Impedance-Based Stability Criterion by Using the Vector Fitting Method
AU - Dowlatabadi, Mohammadkazem Bakhshizadeh
AU - Blaabjerg, Frede
AU - Hjerrild, Jesper
AU - Kocewiak, Lukasz
AU - Bak, Claus Leth
PY - 2018/12
Y1 - 2018/12
N2 - In this paper, some issues related to the impedance-based stability criterion, such as RHP poles in the minor-loop gain, how to specify source and load impedances, and node-dependent stability margins are discussed and the vector fitting method is used to improve the method. This results in an eigenvalue analysis of the system instead of using the Nyquist diagram, and leads to obtain more information about the system. Furthermore, a participation factor analysis can be used to identify the problematic subsystem. The proposed method is examined in the assessment of a stable and an unstable system, and simulation results are used for verification.
AB - In this paper, some issues related to the impedance-based stability criterion, such as RHP poles in the minor-loop gain, how to specify source and load impedances, and node-dependent stability margins are discussed and the vector fitting method is used to improve the method. This results in an eigenvalue analysis of the system instead of using the Nyquist diagram, and leads to obtain more information about the system. Furthermore, a participation factor analysis can be used to identify the problematic subsystem. The proposed method is examined in the assessment of a stable and an unstable system, and simulation results are used for verification.
KW - Eigenvalue analysis
KW - impedance
KW - harmonic stability
KW - power converter
KW - vector fitting
UR - http://www.scopus.com/inward/record.url?scp=85048857361&partnerID=8YFLogxK
U2 - 10.1109/TEC.2018.2849347
DO - 10.1109/TEC.2018.2849347
M3 - Journal article
SN - 0885-8969
VL - 33
SP - 1739
EP - 1747
JO - I E E E Transactions on Energy Conversion
JF - I E E E Transactions on Energy Conversion
IS - 4
M1 - 8391731
ER -