Open AccessAnalysis and hardware implementation of virtual resistance based PV inverters for harmonics suppression
Author(s) -
Zeng Jiang,
Huang Zhonglong,
Ling Yuchang,
Yang Lin,
Li Zhihua,
Qiu Guobin,
Yang Bo,
Yu Tao
Publication year - 2019
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2019.0314
Subject(s) - harmonics , total harmonic distortion , inverter , harmonic , maximum power point tracking , power (physics) , electrical engineering , voltage , electronic engineering , computer science , engineering , control theory (sociology) , physics , acoustics , control (management) , quantum mechanics , artificial intelligence
Traditional PV inverter is designed for power generation and reducing harmonic distortion without capability of actively participating in harmonic elimination of power grid. This study proposes a virtual resistance based PV inverter to suppress the voltage harmonics at point of common coupling (PCC), in which PV inverters could simultaneously deliver power for fundamental and behave as a series of virtual resistances to absorb power harmonics and then convert them into fundamental power; as a result, voltage distortion of each node of power grid is significantly reduced. No additional sensors are required to measure the non‐linear load current, such that a more flexible installation location of PV inverter can be achieved. Furthermore, current harmonics are controlled by PI controller to track the voltage harmonics multiplied by harmonic conductance, i.e. K h , such that the PV inverter can be equivalent to a virtual resistance. In particular, the absorbed power harmonics are used to evaluate the harmonic suppression, while harmonic conductance K h is regulated automatically to maximise the absorbed power harmonics. Both the simulation and experiment results demonstrate that the effectiveness of the propose method.