Rodrigo A. Ramos

Learn More
In this paper, a novel robust controller for a Static Synchronous Compensator (STATCOM) is presented to enhance the fault ride-through (FRT) capability of fixed speed induction generators (FSIGs), the most common type of generators that can be found in wind farms. The effects of STATCOM rating and wind farm integration on FRT capability of FSIGs are studied(More)
—The complexity of power systems has increased in recent years due to the operation of existing transmission lines closer to their limits, using flexible AC transmission system devices (FACTS), and also due to the increased penetration of new types of generators that have more intermittent characteristics and lower inertial response, such as wind(More)
In this paper, the problem of practical stability of some classes of continuous-time switched systems is studied. The main results of this paper include some sufficient conditions concerning practical stability of continuous-time switched nonlinear systems without a common equilibria for all subsystems. In this class of switched systems, the equilibrium(More)
This paper proposes a systematic method based on linear matrix inequalities for the design of power system stabilizers for synchronous generators connected to distribution grids. The system to be controlled is originally described by a nonlinear dynamical model in state-space form. However, for synthesis purposes we represent it as a norm-bounded linear(More)
— In this paper, we propose an algorithm to design a robust output feedback controller for a Static Synchronous Compensator (STATCOM) to enhance the Low-Voltage Ride-Through (LVRT) capability of fixed-speed wind turbines equipped with induction generators. The wind generator is a highly nonlinear system, and in this paper it is modelled as a linear part(More)
This paper presents a new control scheme for the design of damping controllers for power systems. The scheme is based on the combination of two powerful control design techniques, namely the Linear Matrix Inequalities (LMI) techniques and the Direct Feedback Linearization (DFL). It is shown that the DFL can cancel nonlinearities in the power system model,(More)
In this paper, a new procedure to design Supplementary Damping Controllers (SDCs) for Flexible Alternating Current Transmission System (FACTS) devices is proposed. The control design problem is formulated as a search for a feasible controller subject to restrictions in the form of Linear Matrix Inequalities (LMIs). The main objective, from the application(More)