TY - JOUR
T1 - Low-voltage ride-through control for photovoltaic generation in the low-voltage distribution network
AU - He, Yufei
AU - Wang, Minghao
AU - Jia, Youwei
AU - Zhao, Jian
AU - Xu, Zhao
N1 - Funding Information:
This work was supported by Hong Kong Research Grants Council (RGC) under Theme-based Research Project T23-701/14N and by National Natural Science Foundation of China under grant no. 71971183.
Publisher Copyright:
© The Institution of Engineering and Technology 2020
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10/26
Y1 - 2020/10/26
N2 - The increasing penetration of photovoltaic (PV) energy in power grids will impose system instability issues, especially in the occurrence of faults. However, very limited research has been conducted on the low-voltage ride-through (LVRT) control of PV systems in the low-voltage distribution networks (LVDNs) with predominantly resistive line impedances. To fulfil this remaining gap, the effects of active current injection (ACI) on the grid voltage support in LVDN is mathematically analysed in this study. Subsequently, a novel LVRT control scheme for the PV grid-forming inverter is proposed, where the control distinguishes itself from other existing methods due to its optimisation of ACI and PV energy harvesting with the premise of system safety and specified reactive current injection as per grid codes. Multi-mode control modes are involved in the proposed method for dealing with different environmental conditions and voltage dips. Meanwhile, the DC-link voltage is adaptively operated in a self-adjustable control structure for improving grid resilience. The effectiveness of the proposed control method is verified by simulations in MATALB Simulink and hardware experiments on a PV microinverter. Compared with the traditional LVRT control, the post-fault power recovery and voltage support capability can be significantly improved.
AB - The increasing penetration of photovoltaic (PV) energy in power grids will impose system instability issues, especially in the occurrence of faults. However, very limited research has been conducted on the low-voltage ride-through (LVRT) control of PV systems in the low-voltage distribution networks (LVDNs) with predominantly resistive line impedances. To fulfil this remaining gap, the effects of active current injection (ACI) on the grid voltage support in LVDN is mathematically analysed in this study. Subsequently, a novel LVRT control scheme for the PV grid-forming inverter is proposed, where the control distinguishes itself from other existing methods due to its optimisation of ACI and PV energy harvesting with the premise of system safety and specified reactive current injection as per grid codes. Multi-mode control modes are involved in the proposed method for dealing with different environmental conditions and voltage dips. Meanwhile, the DC-link voltage is adaptively operated in a self-adjustable control structure for improving grid resilience. The effectiveness of the proposed control method is verified by simulations in MATALB Simulink and hardware experiments on a PV microinverter. Compared with the traditional LVRT control, the post-fault power recovery and voltage support capability can be significantly improved.
UR - http://www.scopus.com/inward/record.url?scp=85094919545&partnerID=8YFLogxK
U2 - 10.1049/iet-rpg.2019.1101
DO - 10.1049/iet-rpg.2019.1101
M3 - Journal article
AN - SCOPUS:85094919545
SN - 1752-1416
VL - 14
SP - 2727
EP - 2737
JO - IET Renewable Power Generation
JF - IET Renewable Power Generation
IS - 14
ER -
