A Solar Series Grid Following Harmonic Compensator With Enhanced Grid Current Shaping and Active Power Injection Capability

This work proposes a solar-based series inverter configuration to demonstrate the superior power quality shaping with the active power injection capability in grid-interfaced nonlinear load applications. The proposed configuration realizes the AC network in series. It ensures the reduced AC filter s...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2024-06, Vol.39 (3), p.1563-1574
Main Authors: Reddy, P. Mahesh, Gedam, Amol Ishwarrao, Sekhar, K. Ramachandra
Format: Article
Language:English
Subjects:
and unipolar PWM
Closed loops
Compensators
Configurations
Control methods
Electrical loads
Feedback control
Grid interfacing inverter
Harmonic analysis
harmonic compensation
Harmonics
Inductance
Inverters
non-linear loads
Power harmonic filters
series inverter
Shunt active power filter
Shunts (electrical)
Solar energy
Switches
Switching frequency
three-phase inverter
Topology
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Description
Summary:This work proposes a solar-based series inverter configuration to demonstrate the superior power quality shaping with the active power injection capability in grid-interfaced nonlinear load applications. The proposed configuration realizes the AC network in series. It ensures the reduced AC filter size and DC voltage compared to the conventional inverter topologies. The series inverter configuration mimics the double switching frequency across the load, making the system's overall bandwidth higher than the conventional inverter. The improved bandwidth ensures reduced attenuation towards lower-order load-demanded harmonics. In addition, as the filter size plays a role in harmonic processing capability, in this work, an optimum filter size is derived by analyzing the nonlinear load current rise time signatures at different load resistances and filter inductances. With the appropriate filter sizing, the dynamic solar power and harmonic injection are accomplished by developing a dedicated closed-loop control mechanism for series inverters. The developed control methodology instantaneously derives combined references to individual inverters through instantaneous AC load harmonic segregation and DC solar power computation. With the derived control mechanism, the superiority of the proposed series inverter over a parallel isolated inverter in terms of enhanced harmonic compensation and dynamic solar power injection is demonstrated through experimental results.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2024.3369098