TY - JOUR
T1 - Impact of non-minimum-phase zeros on the weak-grid-tied VSC
AU - Wu, Guanglu
AU - Zhao, Bing
AU - Zhang, Xi
AU - Wang, Shanshan
AU - Egea-Àlvarez, Agusti
AU - Sun, Yuany uan
AU - Li, Yingbiao
AU - Guo, Deyang
AU - Zhou, Xiaoxin
N1 - © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
PY - 2020/10/29
Y1 - 2020/10/29
N2 - Right-half-plain (RHP) zeros can significantly deteriorate a control system’s dynamic performances as it exhibits non-minimum-phase behaviors. In this paper, we investigate the occurrence mechanism of RHP zeros in weak-grid-tied VSCs as well as provide guidance for minimizing their effects. A reduced order multi-input multi-output (MIMO) transfer function of the weak-grid-tied VSC is firstly obtained. Then, the single-input single-output (SISO) transfer function to study the impact of the RHP zeros on the power response is further derived. The existence of RHP zeros is examined by applying the Routh criterion on the numerator of the SISO open-loop transfer function. We find that RHP zeros can exist either when the VSC works as an inverter or a rectifier. Furthermore, large grid impedance values as well as operation points with high active power values can result in a non-minimum-phase system. It is also shown that RHP zeros limit the minimum PLL bandwidth. Simulation results and RTDS experiments validate the correctness of the analysis and the conclusions obtained.
AB - Right-half-plain (RHP) zeros can significantly deteriorate a control system’s dynamic performances as it exhibits non-minimum-phase behaviors. In this paper, we investigate the occurrence mechanism of RHP zeros in weak-grid-tied VSCs as well as provide guidance for minimizing their effects. A reduced order multi-input multi-output (MIMO) transfer function of the weak-grid-tied VSC is firstly obtained. Then, the single-input single-output (SISO) transfer function to study the impact of the RHP zeros on the power response is further derived. The existence of RHP zeros is examined by applying the Routh criterion on the numerator of the SISO open-loop transfer function. We find that RHP zeros can exist either when the VSC works as an inverter or a rectifier. Furthermore, large grid impedance values as well as operation points with high active power values can result in a non-minimum-phase system. It is also shown that RHP zeros limit the minimum PLL bandwidth. Simulation results and RTDS experiments validate the correctness of the analysis and the conclusions obtained.
KW - weak grid tied VSC
KW - non-minimum phate zeros
KW - MIMO transfer function
KW - small signal model
KW - controller bandwidth
UR - https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=5165391
U2 - 10.1109/TSTE.2020.3034791
DO - 10.1109/TSTE.2020.3034791
M3 - Article
SN - 1949-3029
JO - IEEE Transactions on Sustainable Energy
JF - IEEE Transactions on Sustainable Energy
ER -