Open AccessMulti‐functional grid‐connected inverter: upgrading distributed generator with ancillary services
Author(s) -
Zeng Zheng,
Li Xiaoling,
Shao Weihua
Publication year - 2018
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2017.0609
Subject(s) - inverter , generator (circuit theory) , grid , computer science , distributed generation , electrical engineering , renewable energy , engineering , mathematics , power (physics) , physics , voltage , geometry , quantum mechanics
Multi‐functional grid‐connected inverter (MFGCI) is an effective solution for smart grid application to interface renewable energy sources and provide ancillary services. In this study, the controller of an MFGCI‐based distributed generator (DG) is investigated. On the basis of impedance reconfiguration, multiple coupled ancillary services of a DG are modelled to upgrade DG, including power quality conditioning, virtual synchronous generator emulation, and harmonic resonance damping. Analyses highlight potential benefits of DGs to actively participate in some possible services. From the perspective of impedance model, an upgrading solution is also proposed to coordinate these services in a DG. Using the proposed equivalent circuit model, these ancillary services can be uniformly considered as impedance control of the distribution network. Detailed models are presented to explain the principles of ancillary services. Experimental results of a test rig confirm the ancillary services of DG to enhance the power quality, provide virtual inertia, and eliminate the harmonic resonance.