Open AccessFFS modulated VSC with different phase‐shifted 12‐pulse configured transformers for grid integrated large‐scale solar PV plant
Author(s) -
Karmakar Subir,
Mishra Nidhi,
Singh Bhim
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2019.0970
Subject(s) - photovoltaic system , transformer , maximum power point tracking , harmonics , booster (rocketry) , three phase , solar irradiance , electrical engineering , engineering , electronic engineering , voltage , computer science , inverter , physics , atmospheric sciences , aerospace engineering
The requirement for high capacity power conditioning unit (PCU) has increased for application in large‐scale solar photovoltaic (PV) plant for optimisation of the balance of system cost. For high power applications, one of the most important criteria for designing of PCU is to have lower switching losses to minimise the heat generated in the power switching devices. Conventionally, PCU utilises traditional two‐level or three‐level voltage source converter (VSC) topology with high‐frequency switching techniques and due to this, they have lower conversion efficiency and higher device switching losses. In this study, fundamental frequency switching (FFS) modulated three‐level neutral point clamp (3L‐NPC) VSC is used for MW scale PCU, as they have lower switching losses, higher conversion efficiency and higher AC/DC voltage ratio. The 3L‐NPC VSC generates lower order current harmonics, which are mitigated by using different phase‐shifted 12‐pulse PCU transformers located at different pooling location inside solar PV plant. The PV plant configuration for a 40 MW (AC) plant capacity is developed in the Matlab/Simulink environment and implemented in real‐time simulator OPAL‐RT to validate the proposed concept. Harmonics, steady‐state and dynamic performances are demonstrated at constant and changing solar irradiance levels.