TY - JOUR
T1 - Two-Port Network Modeling and Stability Analysis of Grid-Connected Current-Controlled VSCs
AU - Chou, Shih-Feng
AU - Wang, Xiongfei
AU - Blaabjerg, Frede
PY - 2020/4
Y1 - 2020/4
N2 - Converter-grid interactions tend to bring in frequency-coupled oscillations that deteriorate the grid stability and power quality. The frequency-coupled oscillations are generally characterized by means of multiple-input multiple-output (MIMO) impedance models, which requires using the multivariable control theory to analyze resonances. In this article, instead of the MIMO modeling and analysis, the two-port network theory is employed to integrate the MIMO impedance models into a single-input single-output (SISO) open-loop gain, which is composed by a ratio of two SISO impedances. Thus, the system resonance frequency can be readily identified with Bode plots and the classical Nyquist stability criterion. Case studies in both simulations and experimental tests corroborate the theoretical stability analysis.
AB - Converter-grid interactions tend to bring in frequency-coupled oscillations that deteriorate the grid stability and power quality. The frequency-coupled oscillations are generally characterized by means of multiple-input multiple-output (MIMO) impedance models, which requires using the multivariable control theory to analyze resonances. In this article, instead of the MIMO modeling and analysis, the two-port network theory is employed to integrate the MIMO impedance models into a single-input single-output (SISO) open-loop gain, which is composed by a ratio of two SISO impedances. Thus, the system resonance frequency can be readily identified with Bode plots and the classical Nyquist stability criterion. Case studies in both simulations and experimental tests corroborate the theoretical stability analysis.
KW - Impedance model
KW - resonances
KW - stability analysis
KW - two-port network
KW - voltage source converters (VSCs)
UR - http://www.scopus.com/inward/record.url?scp=85078261940&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2019.2934513
DO - 10.1109/TPEL.2019.2934513
M3 - Journal article
SN - 0885-8993
VL - 35
SP - 3519
EP - 3529
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 4
M1 - 8794740
ER -