Electrical Engineering ⇒ Topic : Routh Stability Criterion

Routh Stability Criterion:- The Routh Stability Criterion is a method for determining system stability that can be applied to an ri^th order characteristic equation of the form

Shortcomings of Routh's Criterion:-

• It assumes that characteristic equation is available in polynomial form which is not necessarily always true.
• Although this criterion gives information about absolute stability, it conveys little or no information about how close the system may be to becoming unstable.
• The Routh array may show no change in sign in the first column but the ensuring dynamic response may be characterized by overshoots.
• Routh method does not provide the facility for selecting in a simple and direct fashion the parameters of a system component to stabilize the system when it is found to be absolutely unstable