Open AccessDSOGI with proportional resonance controlled CHB inverter based two‐stage exalted photovoltaic integration in power system with power quality enhancement
Author(s) -
Nirmal Mukundan C.M.,
Jayaprakash P.
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.2019.0255
Subject(s) - photovoltaic system , ac power , electronic engineering , grid connected photovoltaic power system , maximum power point tracking , engineering , electrical engineering , computer science , inverter , voltage
This study presents a grid‐integrated solar photovoltaic system (SPVS). The objective of the work is to explore the scope of cascaded H‐bridge multilevel inverter (CHBMLI) in the high infiltration of photovoltaic (PV) in the distribution system. A five‐level CHBMLI is implemented with a balanced power‐sharing and equal switch stress mode, which increases the system power rating with longer life. The power conversion efficiency is elevated by reduced switching frequency, compared to two‐level inverters. The damped second‐order generalised integral (DSOGI) control‐based grid synchronisation is used to critically damp system oscillations and overshoots at dynamic operating conditions. Hence, safer service of lower rating power electronic switches at high power operation is ensured. It also has better bandpass filtering at the nominal grid frequency. A single‐input multiple‐output single‐ended primary inductance converter realises the isolated DC sources for the CHBMLI. It extracts maximum power from the PV array by using centralised incremental conductance algorithm. The SPVS also considers the nonlinear unbalanced loads at the bus of common coupling and provide shunt active filter functionality. A minimum number of voltage and current sensors are used in the configuration. An extensive analysis is carried out to validate the theoretical claims.