Enhancement of transient stability limit and voltage regulation with dynamic loads using robust excitation control
Version 2 2024-06-04, 04:45Version 2 2024-06-04, 04:45
Version 1 2014-10-28, 10:34Version 1 2014-10-28, 10:34
journal contribution
posted on 2024-06-04, 04:45authored byJ Hossain, A Mahmud, N Roy, H Pota
In stressed power systems with large induction machine component, there exist undamped electromechanical modes and unstable montonic voltage modes. This article proposes a sequential design of an excitation controller and a power system stabiliser (PSS) to stabilise the system. The operating region, with induction machines in stressed power systems, is often not captured using a linearisation around an operating point, and to alleviate this situation a robust controller is designed which guaruntees stable operation in a large region of operation. A minimax linear quadratic Gaussian design is used for the design of the supplementary control to automatic voltage regulators, and a classical PSS structure is used to damp electromechanical oscillations. The novelty of this work is in proposing a method to capture the unmodelled nonlinear dynamics as uncertainty in the design of the robust controller. Tight bounds on the uncertainty are obtained using this method which enables high-performance controllers. An IEEE benchmark test system has been used to demonstrate the performance of the designed controller
History
Journal
International journal of emerging electric power systems