In this section
@article{Feng:2026:10.1109/TPEL.2026.3678386,
author = {Feng, N and Zhang, X and Chen, K and Zhu, J and Yang, X},
doi = {10.1109/TPEL.2026.3678386},
journal = {IEEE Transactions on Power Electronics},
pages = {15649--15664},
title = {Generalized z-Domain Modeling and Analysis for High-Order Grid-Connected Inverters},
url = {http://dx.doi.org/10.1109/TPEL.2026.3678386},
volume = {41},
year = {2026}
}
TY - JOUR
AB - With the rapid development of power electronics technology, discrete-time digital controllers are taking an increasingly dominant role in converter control. Existing converter control methods lack the scalability required by practical power electronic systems with high-order filters and lack the accuracy needed for stability assessment under complex topologies. To remove these limitations, this article proposes a highly accurate and scalable method for linear time-invariant systems of arbitrary integer order that include time delays. The proposed approach utilizes the so-called modified z-transform that accurately models delays that are not necessarily multiples of the sampling period, and therefore yields an enhanced capability for stability margin assessment. The z-domain modeling, digital controller design, and stability analysis are discussed in detail and compared with mainstream methods. The improved performance of the proposed method is verified via both numerical simulations and physical experiments, under various component configurations and filter topologies. The results show that the proposed method predicts the margin of the stabilizing feedback gain significantly more accurately than the ones predicted by the existing methods.
AU - Feng,N
AU - Zhang,X
AU - Chen,K
AU - Zhu,J
AU - Yang,X
DO - 10.1109/TPEL.2026.3678386
EP - 15664
PY - 2026///
SN - 0885-8993
SP - 15649
TI - Generalized z-Domain Modeling and Analysis for High-Order Grid-Connected Inverters
T2 - IEEE Transactions on Power Electronics
UR - http://dx.doi.org/10.1109/TPEL.2026.3678386
VL - 41
ER -