TY - JOUR
T1 - Fault Modeling and Analysis of Grid-connected Inverters with Decoupled Sequence Control
AU - Zhang, Qi
AU - Liu, Dong
AU - Liu, Zhou
AU - Chen, Zhe
PY - 2022
Y1 - 2022
N2 - With an increasing number of inverter-interfaced generators (IIGs), the power system is undergoing massive shifts toward the power electronic dominated power system. Such paradigm change poses significant challenges to existing fault analysis theory and the protection system, as a result of the disparate short-circuit response. Given this, the fault analysis theory needs to be further investigated and expanded to address issues arising from the new grid paradigm. Under this context, this article proposes an analytic model for short-circuit analysis of IIGs with decoupled sequence control (DSC) based on the Laplace transform. With the proposed model, the analytic fault current expression can be obtained and the fault characteristic can be analyzed. Compared with existing studies, the proposed model distinguishes itself by three key merits. First, the proposed model takes into account the delay feature of the controller, which enables transient analysis. Second, the model covers the impact of controller parameters and low voltage ride through strategy in detail which is missing in the most existing literature. Third, the proposed model provides a theoretical foundation of IIGs with DSC in the fault analysis, which makes it more applicable for the protection setup issues in reality. In the end, the correctness and feasibility of the proposed model is validated by the simulation and experimental result.
AB - With an increasing number of inverter-interfaced generators (IIGs), the power system is undergoing massive shifts toward the power electronic dominated power system. Such paradigm change poses significant challenges to existing fault analysis theory and the protection system, as a result of the disparate short-circuit response. Given this, the fault analysis theory needs to be further investigated and expanded to address issues arising from the new grid paradigm. Under this context, this article proposes an analytic model for short-circuit analysis of IIGs with decoupled sequence control (DSC) based on the Laplace transform. With the proposed model, the analytic fault current expression can be obtained and the fault characteristic can be analyzed. Compared with existing studies, the proposed model distinguishes itself by three key merits. First, the proposed model takes into account the delay feature of the controller, which enables transient analysis. Second, the model covers the impact of controller parameters and low voltage ride through strategy in detail which is missing in the most existing literature. Third, the proposed model provides a theoretical foundation of IIGs with DSC in the fault analysis, which makes it more applicable for the protection setup issues in reality. In the end, the correctness and feasibility of the proposed model is validated by the simulation and experimental result.
KW - Analytical models
KW - Fault analysis
KW - Fault currents
KW - Power systems
KW - Steady-state
KW - Surge protection
KW - Surges
KW - Transient analysis
KW - decoupled sequence control (DSC)
KW - inverter-interfaced generators
KW - renewable energy sources
UR - https://ieeexplore.ieee.org/document/9460786
U2 - 10.1109/TIE.2021.3088378
DO - 10.1109/TIE.2021.3088378
M3 - Journal article
SN - 0278-0046
VL - 69
SP - 5782
EP - 5792
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 6
ER -