The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Biological creatures perform their motion by using distributed spinal control system. Natural control generates motion instantly based on the feelings from the environment. In line with this concept, an artificial control system is known as Central Pattern Generator (GPG) is an online motion generation system that can be generated instantly like spine based control system. CPG also generates online...
This paper describes the different techniques available for extracting mechanical energy from the waves and controls the wave power conversion system. Some sort of control system is necessary to get the maximum power output from the converter. Also the optimum oscillation of wave energy converter is important to get the maximum energy from the wave. In this paper the maximum power production from...
Flocking control has recently been used in smart grid applications to stabilize power systems during a transient instability period. Based on consensus and cooperation of multi-agent control systems, flocking control uses cyber information about the power system to help achieve stability after the occurrence of a fault in the power system. Recent work showed that such controller can be useful in a...
Parallel-form narrowband feedback active noise control (FBANC) system has been shown to perform better than conventional internal model control (IMC) based FBANC system in cancelling multi-tonal noise. A previous paper illustrated a novel approach in estimating the frequencies of the multi-tone noise, and using an internal tonal generator cum frequency grouping unit to increase its frequency separation...
This paper presents a Multi-Agent System (MAS) to model and enable an active power management in a multiple microgrids system consisting of batteries, photovoltaic and diesel micro sources in islanded or grid-connected operation. The multi-agent system was developed in JADE (Java Agent DEvelopment Framework), a Foundation for Intelligent Physical Agents (FIPA) and a compliant open source multi-agent...
This paper presents a shunt-connected converter for interfacing a distributed generation system and the grid, with focus on uncontrolled small power wind generators. The objective is to show that the converter, with a suitable control strategy, is able to impose sinusoidal voltage and, in most cases, guarantee the compliance of the grid voltage with the THD standard levels. The strategy allows, simultaneously,...
An experimental setup is developed to emulate a wind turbine-generator system. The configuration of the wind energy conversion system is elaborated using OPAL-RT real-time simulator and electrical modules from Lab-Volt. In order to operate such system, a control scheme is designed for the generator side and grid side converters. The experiment can be reconfigured for conducting research and teaching...
An improved PID sliding mode control strategy with constant switching frequency for the voltage regulator of doubly salient electro-magnetic generator has been proposed in this paper. Next, operating principle of controller was described in detail and the stable condition of the system was deduced by Lyapunov function based on mathematical model and working principle of generator. Considering improved...
The flexible alternating current transmission system (FACTS), a new technology based on power electronics can be used to improve controllability, stability, and power transfer capability of AC transmission systems. In this paper SSSC damps or decrease Sub Synchronous Resonance in the power system caused during fault or at disconnection of fault. PI or Fuzzy Logic Controller along with an additional...
The paper analyzes the capability of a wind power plant, based on doubly-fed induction generators (DFIGs) with an improved control system, to fulfill low voltage ride-through (LVRT) capability of the wind turbines providing the reactive power support. According to grid code requirements, tripping of wind generators under grid faults is not allowed. The sensitivity of DFIGs to grid faults requires...
Modern SRAM-based Field Programmable Gate Arrays (FPGAs) are increasingly employed in safety- and mission-critical applications. However, the aggressive technology scaling is highlighting the increasing sensitivity of such devices to Single Event Upsets (SEUs) caused by external radiation events. Assessing the reliability of FPGA-based systems in the early design stages is of upmost importance, allowing...
In this paper, we address the communication overhead problem between OpenFlow controllers and switches due to table-miss in a flow table. For dealing with table-miss, the switch informs the controller by sending a packet-in message to make the controller perform further actions. However, this packet-in procedure to deal with table-miss may cause a controller overhead when one controller has to process...
This paper proposes a nonlinear control methodology for three phase grid connected of PV generator. It consists of a PV arrays; a voltage source inverter, a grid filter and an electric grid. The controller objectives are threefold: i) ensuring the Maximum power point tracking (MPPT) in the side of PV panels, ii) guaranteeing a power factor unit in the side of the grid, iii) ensuring the global asymptotic...
This paper is about a hierarchical structure with an event-based supervisor in a higher level and a fractional-order proportional integral (FOPI) in a lower level applied to a wind turbine. The event-based supervisor analyzes the operation conditions to determine the state of the wind turbine. This controller operate in the full load region and the main objective is to capture maximum power generation...
The behavior of wind farms with doubly fed induction generators (DFIGs) in fault ride through (FRT) conditions is investigated in the first part of this article. The requirements mandated by grid-codes to contribute to the voltage stability are introduced. Afterwards, the problems associated with applying the crowbar system in FRT conditions are discussed. In the next part, modeling of this problem...
This paper presents two six-phase open-end machine conversion systems. They are composed of three three-leg converters connected in series to a six-phase machine with open terminals, in an open-end winding connection. The converters use diodes to replace controlled switches, making the conversion system non-reversible and with a reduced number of controlled components. In this case, the machine must...
A nonlinear control methodology for three phase grid connected of photovoltaic generator is presented in this paper. It consists of a PV arrays, a voltage source inverter, a grid filter and an electric grid. The controller objectives are threefold: i) ensuring the Maximum power point tracking (MPPT) in the side of PV panels, ii) guaranteeing a power factor unit in the side of the grid, iii) ensuring...
This paper presents a versatile test bench for the investigation of the power electronics converter and its control for different wind energy conversion concepts. A three-level back-to-back converter connects a drive train consisting of an induction machine and a synchronous machine to the grid. 4-quadrant operation is feasible on both sides controlling the converter either in 2- or 3-level mode....
This paper discusses a AC-DC converter which is constructed by a Modular Multilevel Converter (MMC) for a wind power generation system connected to Micro-grid. The proposed system which is constructed the MMC with an H-bridge cell achieves to convert from a generator voltage of 3.3 kV into DC bus voltage of 340 V. Moreover, as a fundamental evaluation, the experimental result by miniature model of...
Hydraulic wind power transfer systems deliver the captured energy by the blades to the generators differently and through an intermediate medium i.e. hydraulic fluid. This paper develops a control system for a nonlinear model of hydraulic wind power transfer systems. To maintain a fixed frequency electrical voltage by the system, the generator should remain at a constant rotational speed. The fluctuating...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.