This paper presents a modular multilevel converter (MMC)-based power electronic transformer (PET) for interconnection of solar photovoltaic (PV) system and the grid. The system under study consists of a MMC-based PET and a three-phase modular multilevel inverter (MMI). The MMC-based PET extracts the maximum power from the PV system. The MMI delivers the solar PV generated power to the grid. The MMC-based PET also provides a galvanic isolation and replaces the primitive line frequency transformers. Various component of the control system includes perturbing and observation algorithm (P&O), phase shift control, model predictive control (MPC) and voltage balance algorithm. The P&O algorithm and phase shift control are employed to the MMC-based PET to extract maximum energy from the solar PV system and transfer it to the intermediate dc-link. The MPC scheme regulates the dc-link voltage of the MMI to inject the PV power into the grid. The voltage balance algorithm balances the sub-module capacitor voltage of MMCs. The system performance and effectiveness of the control algorithm is illustrated through computer simulations for different solar irradiance levels.
Control of Modular Multilevel Converter-based Power Electronic Transformer for Grid Integration of Solar PV System
04.08.2022
1029546 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Structural Analysis and Modular Control Law for Modular Multilevel Converter (MMC)
British Library Conference Proceedings | 2020
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