z-logo
open-access-imgOpen Access
Fault tolerance enhancement of the PV module system by improving the topology and control strategy
Author(s) -
Zhang Yong,
Lv Zeyan,
Yu Miao,
Tang Jiacheng,
Wei Wei
Publication year - 2020
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2019.1277
Subject(s) - photovoltaic system , fault (geology) , topology (electrical circuits) , fault tolerance , ground , control theory (sociology) , fault detection and isolation , voltage , engineering , computer science , electronic engineering , control (management) , electrical engineering , reliability engineering , actuator , artificial intelligence , seismology , geology
Photovoltaic (PV) stations are easily affected by the partial shading, short‐circuit fault and grounding fault, which will reduce the power generation and degrade the system stability. Instead of separating the fault location based on complex fault detection algorithms, this study has proposed an improved topology and control strategy to address the abovementioned issues. Specifically, the buck–boost converter is applied in each PV module, and the two‐stage dc/dc/ac control is replaced by the single dc/ac control, which can effectively avoid the influences of the partial shading and the short‐circuit faults in the single or multiple PV modules. Meanwhile, to further tackle the problem of grounding fault, the small‐signal model is constructed to analyse the influence of the grounding resistance on the system stability, and the mechanism of the undesired dc voltage component and harmonic voltage component are revealed. Then a zero‐axis proportional resonant control is further added. Finally, the experiments in different conditions are carried out based on the RT‐LAB platform. The results have demonstrated that the proposed improved topology and control strategy can enhance the fault tolerance of the system and guarantee the system stability in the presence of partial shading, short‐circuit fault and grounding fault.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here