A new methodology for the coordinated design of robust decentralized power system damping controllers

Abstract

This paper presents the fundamentals and the algorithm of a new methodology for the design of robust power system damping controllers. The methodology provides controllers capable of fulfilling various practical requirements of this problem, which could not be simultaneously satisfied by the majority of the proposed robust control approaches until now. The design procedure is based on a special formulation of the dynamic output feedback control problem, in which the design problem can be expressed directly in the form of linear matrix inequalities. The formulation also allows the incorporation of decentralization constraints on the controller matrices, one of the practical requirements for power system damping controllers. Other practical requirement is satisfied with the use of the polytopic model (to ensure the robustness of the closed-loop system with respect to the variation of operating conditions). Moreover, the inclusion of a regional pole placement criterion allows the specification of a minimum damping factor for all modes of the controlled system. The results show the controller is able to provide adequate damping for the system oscillation modes.

Control Coordination Within a VSC HVDC Link for Power Oscillation Damping: A Robust Decentralized Approach Using Homotopy

“…A procedure based on H ∞ is discussed in [11] for tuning multiple FACTS devices. In [12], a dynamic output feedback for decentralized design using linear matrix inequality (LMIs) considering multiple operating conditions is illustrated. The controller order, however, is the same as the dimension of the open-loop plant for both these approaches which could be prohibitively large for practical implementation.…”

“…ROBUST DECENTRALIZED CONTROL: HOMOTOPY APPROACH The control design is formulated in two-stages. In the first stage, a centralized controller, G C (s) is computed using methods reported in [12], [15], [16]. In the second stage, the controller matrices are deformed from full matrices defined by a centralized controller, as shown in Fig.…”

Decentralised control for damping multimodal oscillations through CSC/VSC based HVDC transmission technologies

“…A number of approaches to decentralised control have been proposed [2][3][4][5]. However, the focus of most of them are on decentralised design of low-order PSS in a SISO or MIMO framework; or otherwise, on the robust control design techniques which evidently result in high order controllers and thus proving a practical limitation amongst the network operators.…”

“…Ramos et al [4] used dynamic output feedback for decentralised design using LMIs considering multiple operating conditions. The controller order, however, is at least, as high as the open-loop plant.…”

Robust low-order controller design for multi-modal power oscillation damping using flexible AC transmission systems devices

“…used dynamic output feedback for decentralised design using LMIs [14] considering multiple operating conditions The controller order, however, is at least, as high as the open loop plant for both these approaches. The above list is, by no means, an exhaustive one but is reasonably representative of the limitations of the past research in achieving all the design specifications outlined above.…”