Impedance-Based Stability and Transient-Performance Assessment Applying Maximum Peak Criteria

The impedance-based stability-assessment method has turned out to be a very effective tool and its usage is rapidly growing in different applications ranging from the conventional interconnected dc/dc systems to the grid-connected renewable energy systems. The results are sometime given as a certain...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2013-05, Vol.28 (5), p.2099-2104
Main Authors: Vesti, S., Suntio, T., Oliver, J. A., Prieto, R., Cobos, J. A.
Format: Article
Language:English
Subjects:
Alternative energy
Applied sciences
Circuit properties
Convertors
Electric currents
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical machines
Electronic circuits
Electronics
Exact sciences and technology
Gain
Gain measurement
Impedance
Minor-loop gain
Power supply
Robust stability
Sensitivity
sensitivity function
Signal convertors
stability
Stability criteria
switched-mode converter
Testing. Reliability. Quality control
Transfer functions
transient performance
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Summary:The impedance-based stability-assessment method has turned out to be a very effective tool and its usage is rapidly growing in different applications ranging from the conventional interconnected dc/dc systems to the grid-connected renewable energy systems. The results are sometime given as a certain forbidden region in the complex plane out of which the impedance ratio--known as minor-loop gain--shall stay for ensuring robust stability. This letter discusses the circle-like forbidden region occupying minimum area in the complex plane, defined by applying maximum peak criteria, which is well-known theory in control engineering. The investigation shows that the circle-like forbidden region will ensure robust stability only if the impedance-based minor-loop gain is determined at the very input or output of each subsystem within the interconnected system. Experimental evidence is provided based on a small-scale dc/dc distributed system.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2012.2220157