Method of Evaluating and Ensuring Stability of AC/DC Power Systems
AssigneeVirginia Tech Intellectual Properties, Inc.
InventorsRolando Burgos, Dushan Boroyevich, Fred Wang, Kamiar Karimi
Life of this patent
Estimating the term…
Abstract
Approximating loci of eigenvalues or characteristic gains of a return ratio matrix of a model of a multi-phase power converter circuit by the loci of the d-d and q-q elements of said synchronous frame of reference applied to said model, allows determination and assessment of stability of the circuit or forbidden operational parameters of the combination of an AC power source and a power converter at an interface thereof by application of a standard Nyquist stability criterion.
Claims19
A method of assessing stability of a combination of an AC power source and an active front end (AFE) power converter, said method comprising steps of
- applying a synchronized frame of reference to a model of the AC source and power converter,
- approximating loci of eigenvalues or characteristic gains of a return ratio matrix of said model by the loci of the d-d and q-q impedance elements of said synchronous frame of reference applied to said model, and
- determining stability of said combination of said AC power source and said power converter at an interface thereof by application of a standard Nyquist stability criterion.
A method of designing a power circuit comprising a combination of an AC power source and an active front end (AFE) power converter, said method comprising steps of
- applying a synchronized frame of reference to a model of the AC source and power converter,
- approximating loci of eigenvalues or characteristic gains of a return ratio matrix of said model by the loci of the d-d and q-q impedance elements of said synchronous frame of reference applied to said model, and
- determining stability of said combination of said AC power source and said power converter at an interface thereof by application of a standard Nyquist stability criterion.
Dependencies are inferred from the claim text.