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The control of a variable-speed wind turbine below the rated wind speed is achieved by controlling the generator. The main goal is to maximize the wind power capture at variable wind speed which can be achieved by adjusting the turbine speed in such a way that the optimal tip speed ratio λopt is maintained. For higher than rated wind speeds but below the cut-out limit, the captured power is kept constant...
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...
Maximising electricity production from wind requires improvement of wind turbine reliability. Component failures result in unscheduled or reactive maintenance on turbines which incurs significant downtime and, in turn, increases production cost, ultimately limiting the competitiveness of renewable energy. Thus, a critical task is the early detection of faults. To this end, we present a framework for...
This paper presents WECS (wind energy conversion system) installed with BTB (back-to-back) medium voltage diode clamped five-level converter and SCIG (Squirrel-Cage-Induction-Generator) for a large capacity wind turbine (5MW). The DTC (direct torque control) has been used for the machine side diode clamped five-level converter. The use of DTC with the MLC (multilevel converter) gives a better performance...
This paper proposes a Quasi-Monte Carlo (QMC) simulation based multi-objective economic dispatch, which aims to reduce the fuel cost and emission of the grid simultaneously. During the simulation, QMC models the stochastic behaviours of wind speed and distributed loads with low-discrepancy sequences. In comparison with conventional Monte Carlo (MC) simulation, the computational complexity of QMC is...
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...
Microgrids define a new paradigm in the smart grid concept for distributed energy resources integration. As one of the key enabling components of the smart grid, microgrids can operate independently of or in parallel with the utility grid. Since most of the distributed resources are renewable energy based, the dynamics of the system change due to their unpredictable and intermittent nature. Accordingly,...
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 inclusion and modeling of uncertainty in conventional load flow is required with the enhancement in the penetration of intermittent generation. As a result, the multi-modality is there in output distribution functions. In this paper, a probabilistic load flow method is used with two wind generator models with multimodal loadings and a spline based reconstruction technique is introduced for the...
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...
The higher penetration of Non Dispatchable Energy Sources inspite of its many obvious benefits may cause system stability into jeopardize. Also its ability to increase system reliability needs to be examined due to its inherent intermittency. This problem can be overcome by using a mix of renewable energy sources and also the use of storage units. A Microgrid consisting of wind and PV connected to...
It is now well established that renewable energy sources (RESs) and distributed generation system (DGs) are there to play major role to meet out the electrical energy needs of the world. The RESs are being utilized for electrical power generation at small levels by way of forming microgrid (MG). But because of the uncertainties involved due to unpredictable weather conditions, the power generated...
In this paper a supervision system based on the proportional distribution algorithm is developed, for a large wind farm based on the squirrel cage asynchronous generator (SCAG), associated with the maximum power point tracking (MPPT) and the PQ control. The MPPT control mode is used to extract the maximum power from the wind and the PQ control is used to inject the required active and reactive power...
The continuous rise of energy demand worldwide combined with the decrease of natural resources such as fossil fuel represents a huge energy problem which facing humanity. Industry as well as consumers must rethink how to produce and use energy at low cost price. Renewable Energy (RE) applications and energy savings are keys to meet this challenge in a sustainable way and reduce the percentage of carbon...
Optimal unit sizing of generation units in small off-grid systems is an important aspect to minimize total annual cost. This can be applied to wind, photovoltaic (PV), and hybrid wind-PV power generating systems to meet power demand for a residential home constructed at a specific site located in remote hilly areas in Turkey's northwest Black Sea coast where no grid extension is available. It is obvious...
This study proposes a control system design for Electrical Network Connected Wind Farm (ENCWF) using Direct Drive Permanent Magnet Synchronous Generator (DD-PMSG). The generators are connected to the power network by Voltage Source Converter (VSC) with a dc-link. The proposed scheme is based on Backstepping technique and regulates the powers exchanged between the ENCWF and the electric network to...
Diesel generators (DGs) or solar panels are widely used to provide electricity in isolated regions in Morocco. However, the instability of fuel prices and the stochastic nature of renewables imply that these systems cannot effectively supply the load demand with a good reliability. In this paper, an analysis of different energy components was performed in order to have a cost-effective and reliable...
This paper proposes a three term PID controller to achieve optimum tip-speed ratio of a variable speed fixed pitch two-mass wind turbine system. The main advantage of the method is the functional simplicity and the robust performance in a wide range of operating condition. The objective is achieved by maintaining optimum speed of the rotor via adjusting the restoring generator torque. Hence, PID controller...
This paper presents the dynamic performance of a wind-driven self-excited reluctance generator (WDSERG) to obtain a desired output voltage under a stochastic wind speed variation and changing load. The dynamic model of SERG is developed and utilised to simulate the WDSERG in the MATLAB-Simulink environment. A stochastic wind speed profile is generated using weibull distribution. The excitation capacitance...
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...
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