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

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5 Author(s)
Vesti, S. ; Centro de Electron. Ind., Univ. Politech. de Madrid, Madrid, Spain ; Suntio, T. ; Oliver, J.A. ; Prieto, R.
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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.

Published in:

Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 5 )

Date of Publication:

May 2013

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