A novel method for grid integration of synchronous generator based wind energy generation system
01 Dec 2014-pp 1-6
TL;DR: The proposed method does not employ any power electronic based interface for grid integration of SG based WEGS and hence does not produce harmonics and the control of the proposed method is simple.
Abstract: Conventional grid connected synchronous generator (SG) based wind energy generation system (WEGS) incorporates sophisticated power electronic control system in it which produces harmonics and this deteriorates the quality of output power. Hence, this paper presents a new method for grid integration of SG based WEGS using variable frequency transformer (VFT). The proposed method does not employ any power electronic based interface for grid integration of SG based WEGS and hence does not produce harmonics. Moreover, control of the proposed method is simple. In order to realize the proposed scheme, a digital simulation model of the proposed method has been developed under MATLAB/ Simulink environment. The power flow from the SG to the grid using the model has been studied and its results have been discussed.
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TL;DR: In this paper, the authors explored the possibility of synchronous generator based wind energy generation system feeding an isolated load using a latest power transmission technology i.e. variable frequency transformer (VFT).
19 citations
TL;DR: In this article, a small wind turbine was implemented on a vehicle, such that it is able to capture the air when the vehicle is in motion to generate the required energy to run the vehicle.
Abstract: The global transport sector is heavily dependent on fossil fuels as a vital source of energy. This has adversely affected the climate. This climate change necessitates that technologies employing renewable and clean energy should be utilized in the global transportation sector. To address this issue, in this study, a small wind turbine was implemented on a vehicle, such that it is able to capture the air when the vehicle is in motion to generate the required energy to run the vehicle. Consequently, theoretical modeling and experimental calculation were conducted to confirm the utilization of wind by the turbine of the running vehicle to generate electricity through the conversion process of its electrical subsystem, thereby powering the vehicle as a self-sufficient energy mechanism that can be commercialized. The results show that a car moving at 10 kph produces 8 kWh, for an average wind speed of 2 kph. As a standard car requires 20 kWh to get fully energized, the results indicate that it is possible to fully charge the car and run it for 200 kilom if the car runs at 10 kph for two hours during charging. Consequently, if the car runs at 60 kph, it will take require 20 min to get fully charged and run for the same distance. The findings of this research suggest that the large-scale adoption of wind energy, which is completely clean and available in abundance, to run vehicles can be an innovative solution to meet the energy demand of the global transportation sector.
5 citations
01 Jan 2020
TL;DR: The results show that the proposed Fuzzy logic pitch angle control approach had better performance and improved by 10% from the controllers such as PI and therefore, the efficiency of the system gets improved.
Abstract: There has been a growing interest in wind energy in latest years as it is a budding source for generating electricity with a negligible environmental impact. With the development of aerodynamic models, wind turbines are easily accessible, capable of capturing hundreds of kilowatts of energy. They generate a significant quantity of energy when such WECS are incorporated into the grid. Variable Speed Generation (VSG) strategies were used to maximize energy extraction from the wind. While variable velocity operation requires greater complication and original investment, these disadvantages are offset by increasing energy capture and improving flexibility in control. A growing number of variable velocity WECS systems are therefore being suggested as wind technology advances. Variable Velocity Generation (VSG) approaches differ the turbine’s rotational speed by regulating either a mechanical or electrical parameter to keep a steady turbine tip-speed ratio. This is called a MPPT controller. Maximum power point region is the region in which wind speed is 5–12 m/s and in this region the pitch angle control is done. The monitoring was when the pitch angle controller was designed for MPPT using Fuzzy Logic controller for a 50 Hz system connected to a grid and compared the performance with conventional PI controller. The proposed designed control system topologies designed will regulate pitch command; therefore, power extraction framed can be controlled and maximized. The results show that the proposed Fuzzy logic pitch angle control approach had better performance and improved by 10% from the controllers such as PI and therefore, the efficiency of the system gets improved.
2 citations
01 Jan 2020
TL;DR: This chapter discusses the application of the VFT as controllable, bidirectional AC link for power flow control in-between synchronous grids under steady state and fault conditions.
Abstract: VFT is the latest power transmission technology. It can transfer power within synchronous, in-between synchronous and in-between asynchronous grids. This chapter discusses the application of the VFT as controllable, bidirectional AC link for power flow control in-between synchronous grids under steady state and fault conditions. For the study of steady state analysis, a complete VFT simulation model has been developed in MATLAB/Simulink. A sequence of studies on power transfer in-between synchronous grids is carried out with the developed model. The power flow control with respect to applied torque is achieved. The VFT concept and its application in-between synchronous grids are verified by the obtained results. Moreover, LLLG fault analysis has been carried out at three locations under different conditions in order to understand the effect of LLLG fault on VFT and how VFT reacts to mitigate the effect of the fault.
1 citations
References
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TL;DR: In this paper, an algorithm based on dc link voltage is proposed for effective energy management of a standalone permanent magnet synchronous generator (PMSG)-based variable speed wind energy conversion system consisting of battery, fuel cell, and dump load (i.e., electrolyzer).
Abstract: In this paper, a novel algorithm, based on dc link voltage, is proposed for effective energy management of a standalone permanent magnet synchronous generator (PMSG)-based variable speed wind energy conversion system consisting of battery, fuel cell, and dump load (i.e., electrolyzer). Moreover, by maintaining the dc link voltage at its reference value, the output ac voltage of the inverter can be kept constant irrespective of variations in the wind speed and load. An effective control technique for the inverter, based on the pulsewidth modulation (PWM) scheme, has been developed to make the line voltages at the point of common coupling (PCC) balanced when the load is unbalanced. Similarly, a proper control of battery current through dc-dc converter has been carried out to reduce the electrical torque pulsation of the PMSG under an unbalanced load scenario. Based on extensive simulation results using MATLAB/SIMULINK, it has been established that the performance of the controllers both in transient as well as in steady state is quite satisfactory and it can also maintain maximum power point tracking.
336 citations
"A novel method for grid integration..." refers background in this paper
...Further, they require suitable compensation in order to meet the standards for harmonic pollution which further increases the cost and complexity of the system [4] – [5]....
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TL;DR: In this article, the steady-state reactive power loading capability of DIF-based WTs with doubly fed induction generators (DFIGs) is discussed. And the active-reactive power diagram is systematically derived by considering the typical power-speed relationship and converter loading limits.
Abstract: With the increasing penetration of wind turbines (WTs) grid utilities require extended reactive power supply capability not only during voltage dips but also in steady-state operation WTs with doubly fed induction generators (DFIG) are able to control active and reactive power independently The reactive power capability is subject to several limitations resulting from the voltage, current, and speed, which change with the operating point This paper discusses the steady-state reactive power loading capability of DFIG-based WTs by taking into account the most important physical phenomena restricting the reactive power supply of DFIG-based WT systems The active-reactive power diagram is systematically derived by considering the typical power-speed relationship and converter loading limits The authors discuss also some special operating modes limiting the reactive power capability together with aspects of modeling and control that give rise to these limitations
255 citations
"A novel method for grid integration..." refers background in this paper
...In some countries, this share is about 50% [1]....
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TL;DR: In this paper, a novel approach for simultaneous power generation and harmonic current mitigation using variable speed WECS with DFIG is presented. And a new control strategy is proposed to upgrade the DFIG control to achieve simultaneously a green active and reactive power source with active filtering capability.
135 citations
"A novel method for grid integration..." refers background in this paper
...It is essential to ensure that the grid is capable of staying within the operational limits of frequency and voltage for all foreseen combination of WECS and consumer load, and to keep, at the same time the grid transient stability [6]....
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01 May 1996
TL;DR: In this paper, the authors describe the use of a permanent magnet synchronous generator for use with a wind turbine, where the stator is allowed limited rotational movement by connecting it to the wind turbine housing via a spring and a mechanical damper.
Abstract: The paper describes the use of a novel permanent-magnet synchronous generator for use with a wind turbine The small pole pitch of the generator allows it to operate at low speeds, be directly coupled to the wind turbine and maintain a direct electrical grid connection The ability to couple the generator directly to the wind turbine eliminates the need for the usual gearbox, but leads to a generator design where conventional damper windings are ineffective as there is too little space The paper describes an alternative damping system whereby the stator is allowed limited rotational movement by connecting it to the wind turbine housing via a spring and a mechanical damper This arrangement allows greater damping of power-angle oscillations than is possible using conventional damper windings The response of the generator to step changes in driving torque is used to illustrate the effectiveness of such a design The behaviour of the generator on both synchronisation and during operation in a varying wind is discussed to demonstrate the feasibility of this new design
125 citations
"A novel method for grid integration..." refers background in this paper
...The use of a gearbox causes many problems such as it demands regular maintenance, increases the weight of the WECS, generates noise, and increases power losses [3]....
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