Abstract
In stressed power systems with large induction machine component, there exist undamped electromechanical modes and unstable monotonic 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 guarantees 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.
Original language | English |
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Pages (from-to) | 561-570 |
Number of pages | 10 |
Journal | International Journal of Emerging Electric Power Systems |
Volume | 14 |
Issue number | 6 |
DOIs | |
Publication status | Published - 12 Oct 2013 |
Externally published | Yes |
Keywords
- nonlinearity
- robust control
- transient stability
- uncertainty
- voltage regulation