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Battery energy storage systems can be used in wind-diesel systems to offset diesel fuel and potentially reduce the cost of the energy served by limiting the amount of dumped energy. However, this problem is characterized by two components: energy storage sizing and its on-line operation. This paper presents a energy storage sizing approach, which is then adapted for on-line scheduling. The operating...
Variability in power output is a characteristic of wind energy, resulting in an adverse impact over the power system. In order to reduce the wind power impact over the power quality, a SMES is applied to smooth short-term fluctuations in wind farms. An independent power control strategy is used for the SMES. An indirect wind power control strategy based on compensating the power fluctuations by SMES...
In this work is presenting a reactive homopolar synchronous machine with stator excitation (RHSMSE) destined to operate as generator for hydroelectric or wind power stations of low and middle power or as servomotor with reduced inertia. By means of the equivalent magnetic circuits method is deduced a mathematic model based on which is simulated the main measures that features the machinepsilas operation...
Renewable energy sources (RES) often share two disadvantageous features: they produce energy whenever they want and wherever they want. Alternative primary sources like wind or solar radiation may be available only at remote locations. In the case of off-shore wind farms, expensive high voltage DC lines might be necessary to transport the gained electricity. Additionally, these alternative sources...
This paper presents the study on the integration of battery energy storage system (BESS) to STATCOM for smoothing out the intermittent output power of a wind farm. Lead-acid battery type is considered as the energy storage system for availability and comparably simpler management system. Reviewed several modeling approaches indicating their advantages and drawbacks; particularly, appropriate for high...
This paper shows a simple approach to designing PPS for a variable-speed wind power converter for damping oscillations. The proposed control is evaluated performing several simulations on modified version of 9-bus system. The simulation represent a three-phase short-circuit, and the damping control system is applied with different gains. The selection of the variable-speed wind power converterpsilas...
Wind energy systems are being closely studied because of its benefits as an environmentally friendly and renewable source of energy. Because of its unpredictable nature, power management concepts are essential to extract as much power as possible from the wind when it becomes available. In this paper an algorithm has been developed to keep the system at its highest possible efficiency at all times...
Fault ride-through capability is one of the basic requirements for a large-scale wind farm. There are two aspects to fault ride-through: to continue power supply without breaking any part of the system and to resume normal operation after clearance of the fault. In this paper the transients of the doubly-fed induction generator is analyzed. The safe operating area characteristics of the IGBT converter...
Due to random variations of wind speed, output power of wind generator fluctuates randomly, and consequently fluctuations of power system frequency occur. These frequency fluctuations pose serious problems on the system, for example, lamp flicker and inaccuracy in the timing devices. Therefore, minimization of fluctuations of power system frequency is very important from the viewpoint of power system...
Wind power fluctuations that have adverse impacts on power quality are becoming more serious as wind energy reaches higher level of penetration. This paper focuses on the control design of super-capacitor energy storage system (SCES) which serves for the whole wind farm. The control method of the aggregated SCES is proposed for smoothing medium frequency wind power fluctuations and maintaining wind...
This paper proposes a control strategy for variable speed wind energy conversion system (WECS), incorporating maximum power point tracking (MPPT) algorithm, using direct driven permanent magnet synchronous generator (PMSG). The generator is operated in the speed control mode below the base speed by controlling the terminal voltage using three phase front-end active-rectifier feeding power to the DC...
The potential impact of SiC devices on a wind generation system is explored by simulations in this work. The system modeling is explained in detail. Most recent SiC MOSFET prototypes are obtained, tested, and used to form a bi-directional converter in the simulation. The performance of the SiC converter is analyzed and compared to its Si counterpart at different temperatures and frequencies. A conclusion...
The vector control of the brushless doubly fed induction generator (BDFIG) was implemented in Matlab/Simulink/SymPowerSystems using a rotating reference frame fixed on the power winding flux. The control algorithms of the grid-side and control-side converters can regulate the active and reactive power independently. The measure of the power winding flux angle, realized using a phase locked loop (PLL),...
This paper focuses on efficiency analysis and comparative study of hard- and soft-switching dc-dc boost converters in wind farms. The efficiency of an ac or a dc-based wind farm is dependent on the efficiency of its key components such as dc-dc converters. The demand for dc-dc converters depends on how voltage fluctuations are adjusted. This paper analyzes the efficiency of the switching method used...
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