Article
A Multilevel DC to Three-Phase AC Architecture for Photovoltaic Power Plants Public Deposited
- Abstract
This paper presents a photovoltaic (PV) inverter architecture composed of stackable dc to three-phase ac converter blocks. Several such blocks, each containing a converter power stage and controls, are connected in series on their ac sides to obtain transformerless medium-voltage ac interfaces for PV power plants. The series-connected structure is made possible by a quadruple active bridge dc-dc converter that provides isolation between the PV input and each of the three ac-side phases within each block. Furthermore, since incoming PV power is transferred as constant balanced three-phase ac power, instantaneous input-output power balance bypasses the need for bulk energy storage. To streamline implementation and maximize system scalability and resilience, decentralized block-level controllers accomplish dc-link voltage regulation, maximum power point tracking, and ac-side power sharing without centralized means. The proposed architecture is validated by simulations of a PV string to medium-voltage ac system consisting of six blocks and on a proof-of-concept hardware prototype that consists of three cascaded converter blocks.
- Creator
- Date Issued
- 2019
- Academic Affiliation
- Journal Title
- Journal Issue/Number
- 1
- Journal Volume
- 34
- Last Modified
- 2020-11-17
- Resource Type
- Rights Statement
- DOI
- ISSN
- 1558-0059
- 0885-8969
- Language
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JESTPE_T_minus1.pdf | 2020-11-17 | Public | Download |