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Classification of different mental tasks using electroencephalogram (EEG) signal plays an imperative part in various brain–computer interface (BCI) applications. In the design of BCI systems, features extracted from lower frequency bands of scalp-recorded EEG signals are generally considered to classify mental tasks and higher frequency bands are mostly ignored as noise. However, in this paper, it...
Subsynchronous control interaction (SSCI) is a fast growing electrical interaction between series-compensated transmission lines and power electronic converters of DFIGs that may destroy the machines if not prevented. Thus, a nonlinear controller is proposed in order to mitigate SSCI in series-compensated doubly-fed induction generator (DFIG)-based wind farms. Partial feedback linearization technique...
This paper presents an H» controller synthesised based on linear matrix inequalities (LMI) for a current source converter based superconducting magnetic energy systems (SMESs) connected to a node of power systems where the regulation of grid current has considered as a control objective. To facilitate the control design, the system is represented in terms of state space realization with uncertainties...
This paper presents a μ-Synthesis H∞ Controller for regulating the switching signal of the inverter connected with a three-phase photovoltaic (PV) system. To facilitate the control design, the system is represented in terms of state space realization with uncertainties. The control design involves selecting proper weighting functions and performing synthesis. The controller order is reduced by Henkel-norm...
This paper presents a H∞ loop-shaping controller for regulating the switching signal of the inverter connected with a single-phase photovoltaic (PV) system. To facilitate the control design, the system is represented in terms of state space realization with uncertainties. The controller design involves achieving proper loop shapes through the choice of the proper weighting functions. A H∞ synthesis...
This paper presents an active disturbance rejection (ADR) controller for the enhancement of transient stability of doubly fed induction generators (DFIGs). In real time estimation and mitigation of the total effect of various uncertainties, ADR controller is particularly effective against a wide range of parameter variations, model uncertainties, and large disturbances. The performance of the designed...
Stability and reliability issues in power grids are of utmost importance with penetration of more renewable energies and smart technologies. Thus it is imperative to continually investigate the grid stability for reliable power system operation. This paper presents dynamic modelling of Borneo power grid and analyses on voltage stability at different location of Borneo power grid under contingencies...
With the increasing wind power penetration, the wind farms are directly influencing the power systems. The majority of wind farms are using variable speed wind turbines equipped with doubly-fed induction generators (DFIG) due to their advantages over other wind turbine generators. Therefore, the analysis of wind power dynamics with the DFIG wind turbines has become a very important research issue,...
Wind energy has been receiving more acceptance as a reproducible, resourceful and clean energy source since last decade. Wind power is not constant and can fluctuate below the rated wind power when the wind speeds are lower than the rated wind speed. This fact affects the grid the wind generators are connected to, which is becoming more significant with the increasing penetration of wind energy systems...
Wind farms begin to influence the power systems with the increasing amount of wind power penetration. The study of such influence justifies the need of a dynamic wind farm model comprising of a large number of generators, but detail models require high simulation computation time. An aggregation technique is required to reduce the model order while maintaining its accuracy. In this paper, a complete...
Existing authentication techniques assumes a one-to-one relationship between the user and the device. However using multiple devices simultaneously by a single user in ubiquitous environments is inherently natural. In this paper we present use cases in which it is essential to authenticate a user continuously to guarantee secured data collection service. Next, we examine techniques found in the literature...
With the increasing wind power penetration, the wind farms are directly influencing the power systems. Therefore, analysis of wind power dynamics has become a very important issue, which justifies the need of a detailed dynamic model of wind power generation system. This paper approaches towards the study on the effect of wind speed variations and machine inertia constants on transient during initialization,...
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