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This paper deals with the modeling and the control of a dual stator induction generator (DSIG) integrated into a wind energy conversion system with a variable speed wind turbine. DSIG is increasingly used because of its advantages in better reliability and supply division. The objective of this work is to present the application of sliding mode control on a DSIG driven by a wind turbine in the second...
This work analyzes the performance of a dual stator-winding induction generator based wind turbine during grid faults. The simulated and experimental results can be used to improve the transient response during these faults, as well as being a reference frame of low-voltage ride-through capability enhancement for this type of induction generator.
As we incorporate more random renewable energy into the power grid, power system operators need to ensure physical constraints, such as transmission line limits, are not violated despite uncertainty. Risk-constrained optimal power flow (RCOPF) based on the Conditional Value-at-Risk (CVaR) is a convenient modeling tool, ensuring that these constraints are satisfied with a high probability (e.g., 95%)...
In order to take full advantages from renewable energy sources; we propose combination between a wind power source and a pumped storage hydro power station taking into account electricity market framework. A scenario is proposed which defines programmed power demand and energy price. An operation optimization scheduling strategy is integrated. This strategy of scheduling requires in priority wind...
The combination of many kinds of renewable energy sources, such as solar power, wind energy with the integration of batteries and diesel generators in the system, is widely used as an alternative energy source in remote areas. Solar and wind energies are widely available in the Southeast Region of Turkey. Therefore, a province situated in the southeastern of Turkey can be autonomous and provide its...
Questions make tutoring interactive. They also facilitate a better learning. Response to a good quality question is a means to generate feedback about students' learning and understanding capabilities. Setting such questions is a challenge for a tutor.
Wind power generation and Solar PV installations continues to grow and are the two key contributors to the large scale variable power generation mix. Utility transmission system operators impose stringent grid codes internationally. Grid code regulations are defined by system operators to outline the rights and responsibilities of all the generators and loads that are connected to the transmission/distribution...
A simulation on developing the voltage control with active management system of Wind Turbines (WT)-diesel generator (DG) hybrid system considering economic criteria is exhibited in this paper. The hybrid system model is developed from mathematical equations of WTs as well as diesel generators and evaluated the system performances. Minimizing the overall cost and power losses the proposed active management...
Due to the benefits of distributed generation (DG), in particular wind DG on a power system, researches on its optimal allocation increased. However, most of these studies failed to incorporate the stochastic nature of wind which could lead to an erroneous result for not considering uncertainties. To address these uncertainties, different wind DG models are used. This paper compares how optimal allocation...
While renewable generation sources provide many economic and environmental benefits for the operation of power systems, their inherent stochastic nature introduces challenges from the perspective of reliability. Existing optimal power flow (OPF) methods must therefore be extended to consider forecast errors to mitigate in an economic manner the uncertainty that renewable generation introduces. This...
Introduction of wind power generation is promoted all over the world so as to utilize renewable energies. Among various types of wind power generation, two-speed switching type squirrel-cage induction generators are used in remote sites and island power systems due to its low cost and ease of maintenance. However, outputs of these generators tend to fluctuate and may deteriorate power quality. Especially,...
The integration of the renewable power generation into the existing grid has been increased significantly and it is expected to be increased further in near future. The placement of renewable power generation units can be done accordance with reactive power loadability and it has to be taken care during the optimal placement. In this paper, a particle Swarm Optimization (PSO) based optimal placement...
Energy sources which are non-exhaustible in nature are solar energy, wind energy, ocean thermal energy and wave tidal power. Among the said renewable energy sources, solar and wind are the major energy sources which has a huge potential to generate electricity, and can overcome the main problems (like 'depletion' and 'environment pollution') of conventional energy sources. As a contribution to further...
The increase in the penetration of non-dispatchable generation calls for the need to contain uncertainity in the already existing power flow programs. In this paper, a method is proposed based on probabilistic load flow with the incorporation of generator bus modelling along with four wind generator models and photovoltaic system. The proposed probabilistic load flow method is tested on the IEEE-118...
Transmission line protective relaying is an important aspect of a reliable power system operation. The issue has become critical due to wide spread grid integration of distributed energy sources. The power system faults do occur in power system network and are more frequent in transmission and distribution systems. The behaviour of faults changes in the presence of renewable energy (RE) sources. This...
The increasing stress on the rapidly diminishing conventional sources of energy like coal and fossil fuels and the devastating ramifications posed by their use in energy production has compelled man to look for cleaner and voluminous alternative sources of energy. Among the various renewable sources of energy, wind happens to be the most abundant and omnipresent one. However, there are various implications...
This work is associated with the renewable energy based microgrid for a standalone operation. The places where the renewable energy sources such as wind, solar, hydro etc. are in abundance can be used to generate electricity by developing microgrid (MG) such as wind- hydro MG. A synchronous reluctance generator (SyRG) is used as a constant speed hydro turbine and a permanent magnet brushless DC generator...
In this paper is presented an algorithm for estimating the wind speed by solving the non-linear model of a wind turbine (WT) using the Newton Raphson iterative method. The wind speed estimations obtained are used for computing the WT generator speed that maximize the extraction of wind power. This optimum generator speed is used as reference for the speed controller of a permanent magnet synchronous...
This paper presents the electromagnetic design of a direct-driven dual-stator superconducting permanent magnet wind power generator of several megawatts. Considering the severe demagnetization in PM materials caused by the huge current in the superconducting armature windings, several new configurations of rotor poles are presented. The features of each configuration are discussed and the FEM results...
This paper presents a novel coreless bidirectional axial-flux-modulation machine for direct-drive contra-rotating wind power generation. Different with the conventional axial flux wind generators, in the proposed machine, dual rotors rotate in the opposite directions and all permanent magnets (PM) with the same polarity are alternatively located with salient poles in rotors. With the bidirectional...
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