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Enterprise Service Bus (ESB) is a middleware infrastructure that provides a way to integrate loosely-coupled heterogeneous software applications based on the services principles. The life-cycle management of services in such environments is a critical issue for the component's reuse, maintenance and operation. This paper introduces a service life-cycle management module that extends the traditional...
This paper discusses the robust stabilization of a linear time-invariant system based on event triggering strategy. In most practical system, it is not possible to update control in continuous manner, so it is given to plant at some periodic discrete instants only. Recently, the event based control technique for control law update has become popular as it uses the resources efficiently while guaranteeing...
A robust power sharing controller for single phase inverter has been developed for the microgrid emergency condition where it is islanded from the main grid, and no communication available. In order to design a robust controller, the Glover McFarlane H infinity synthesis method is used. This design method guarantees the robustness of the droop controller and it allows to specify the settling time...
This paper proposes a current controller for grid tied Voltage Source Inverter (VSI) via a LCL filter using discrete-time Sliding Mode Control (SMC) in a multi-loop framework. The inner loop is implemented by the SMC with reference generated by an outer controller for the VSI side current. The tracking of the current entering the distribution network is ensured by a outer controller with a derivative...
This paper presents a power control study of a Wind Energy Conversion System (WECS) based on a Doubly Fed Induction Generator (DFIG) connected to the electric power grid. Proportional-Integral (PI) and Sliding Mode (SM) controls are used to compare the system's performances in terms of reference tracking and robustness to disturbance rejection and with respect to the machine parameters variation....
This paper proposes and analyzes a current control technique applied to the current control of a three-phase shunt Active Power Filter. The technique is based on an adaptive variable structure controller. The adaptive algorithm compensates for the parametric uncertainties and a modification is applied for robustness with respect to the unmodeled dynamics. The variable structure action built in the...
This paper purposes a hybrid control method applied to a DC-DC Boost converter in order to maintain a constant output voltage and ensure the supply of good power quality to the load. The hybrid controller consists of a fuzzy supervisor which mixes control signals of two types of controllers: robust and fuzzy. Each one of these controllers has good performance in certain operational conditions. The...
In the process of power generation by hydrogen energy, the application of fuel cell has been used widely. As we all known, it often appears that the randomness of hydrogen, oxygen input and power output load, which puts forward higher requirements for the robust design of power converters. The power converter based on traditional sliding mode due to its discrete control law exist inevitable chattering...
This work considers the problem of speed sensorless vector control of a three-phase PMSM using nonlinear control methods. An improved design of continuous sliding mode observer (SMO) is provided with a comprehensive analysis of sigmoid boundary layer to establish its relation with the estimation accuracy. The idea of cascaded SMO and high gain observer (HGO) is proposed for robust speed estimation...
This paper addresses the robust H∞ filtering problem for a class of Markov jump Lur'e systems with time-varying transition probabilities in discrete-time domain. The time-varying character of transition probabilities is considered to be finite piecewise homogeneous. A full-order filter is designed such that the resulting closed-loop systems are stochastically stable and have a guaranteed H∞ performance...
Renewable energy sources are still increasing their penetration in the electric energy system. Their connection to the grid is being done at continuously reduced power. So, a robust current controller is one of the main requirements in a grid-connected voltage source converter, namely in distributed energy sources where the connection can be made to weak grids. Additionally, achieving unity power...
This research work introduces a new control method for feedback control of nonlinear power electronics systems with application example the problem of three-phase voltage source converters. The control method consists of a repetitive solution of an H-infinity control problem for the voltage source converter, that makes use of a locally linearized model of the converter and takes place at each iteration...
With the development of smart grid technology, the future power system will become a complex cyber-physical system. The control and management of this system will impose new challenges to the current Supervisory Control and Data Acquisition system such as scalability in its computational and communications effort, and robustness to single point of failure. Decentralized cooperative control is promising...
A high performance H∞ controller designed to control an Active Magnetic Bearing (AMB) system is considered in this paper. A digital signal processor (DSP) is used to implement the designed controller in real-time. The designed H∞ controller is compared with a conventional lead-lag type compensator and the on-board analogue controller of the AMB under various conditions and disturbances acting on the...
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