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Title: NPC photovoltaic grid-connected inverter with ride-through capability under grid faults
Authors: Dehghani Tafti, Hossein
Maswood, Ali Iftekhar
Lim, Ziyou
Ooi, Gabriel Heo Peng
Raj, Pinkymol Harikrishna
Keywords: DRNTU::Engineering::Electrical and electronic engineering::Power electronics
Issue Date: 2015
Source: Dehghani Tafti, H., Maswood, A. I., Lim, Z., Ooi, G. H. P., & Raj, P. H. (2015). NPC photovoltaic grid-connected inverter with ride-through capability under grid faults. 2015 IEEE 11th International Conference on Power Electronics and Drive Systems.
Abstract: Fault ride through (FRT) capability is one of the challenges faced in the medium to high voltage grid-tied large-scale photovoltaic (PV) power plants. This paper proposes a novel control strategy to enhance the FRT capability of a two-stage multi-string PV plant which consists of DC/DC converters and NPC inverter. The proposed control is implemented to the DC/DC converter to maintain the DC-link voltage under any grid fault conditions by adjusting the extracted PV power to the inverter output power. This is achieved by changing the PV string reference voltage from its maximum power point voltage to a new voltage point with less power. On top of that, a novel voltage-oriented control (VOC) control structure using proportional-resonant (PR) controller is proposed for the NPC inverter. Additionally, the DC-link capacitor voltages are remained balanced at all times due to the adaptive space vector modulation (ASVM) scheme. The evaluation results have verified the feasibility and the FRT capability of a 14kW PV plant using the proposed control scheme under different grid fault conditions.
DOI: 10.1109/PEDS.2015.7203401
Rights: © 2015 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. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Conference Papers
ERI@N Journal Articles

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