Modelling method and applicability analysis of a reduced-order inverter model for microgrid applications

A proper inverter model is an important tool for system stability analysis and parameter design. A complete model is accurate, but computationally expensive. While some reduced-order models are available, they are inaccurate in certain situations, or lose generality as parameters change. The charact...

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Bibliographic Details
Published in:IET power electronics 2020-09, Vol.13 (12), p.2638-2650
Main Authors: Yu, Hongru, Su, Jianhui, Wang, Haining, Wang, Yiding, Shi, Yong
Format: Article
Language:English
Subjects:
control system synthesis
distributed power generation
efficient reduced‐order inverter model
inner‐loop dynamics
inverters
invertors
microgrid applications
model reduction method
modelling method
network dynamics
nonlinear control systems
parameter design
parameters change
power loops
process‐simplified reduction method
proper inverter model
reduced order systems
reduced‐order models
reduced‐order precision problem
Research Article
slow dynamics
stability
strong natural timescale separation
synchronous machines
system stability analysis
theoretical analysis
wider applicability
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Summary:A proper inverter model is an important tool for system stability analysis and parameter design. A complete model is accurate, but computationally expensive. While some reduced-order models are available, they are inaccurate in certain situations, or lose generality as parameters change. The characteristics of these inverters are significantly different from those of synchronous machines with strong natural timescale separation. Although network dynamics and inner-loop dynamics are relatively fast, they seem to have an impact on power loops with slow dynamics, and neglecting them can lead to questionable results. In this study, the limitations of existing general models are demonstrated, and their applicability is analysed. To address the reduced-order precision problem, a process-simplified reduction method and an efficient reduced-order inverter model are proposed for microgrid applications. The developed model has higher precision and wider applicability while uncovering instability mechanisms and addressing other factors. Finally, the correctness of the theoretical analysis and the validity of the model reduction method are verified by comparative experiments.
ISSN:1755-4535
1755-4543
DOI:10.1049/iet-pel.2020.0078