A variable speed wind energy conversion scheme for connection to weak AC systems

Neris, A.S.; Vovos, N.A.; Giannakopoulos, G.B.

doi:10.1109/60.749157

Cited by 62 publications

(29 citation statements)

References 4 publications

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“…All of the described procedure is intended to trace the determined output power by WF control unit. The mechanical torque in the wind turbine shaft is calculated applying Equation (14).…”

Section: Mechanical Partmentioning

confidence: 99%

“…Regarding the command of AGC unit to WF control unit, proper Pcmds must be formed for the WTGs in the WF. Generally, the higher the WTG's available wind velocity is, the higher the available power is according to Equation (14). Therefore, the Pcmd value must be weighted higher for the WTG with •…”

Section: Fuzzy Logic Controllermentioning

confidence: 99%

“…In [12,13], the proposed model is simplified by neglecting the DFIG rotor transients. Detailed model of DFIG-based WF helps proper investigation of the interactions between WTGs and conventional generating units, but most of the extracted models, like the model in [14], are electromagnetic models, which are suitable for power converter control strategies and cannot be employed for frequency stability studies. In [15], a detailed model of DFIG wind turbine is proposed, but the modeling of its power controller, rotor-side and grid-side controllers has made it too complex for power system studies.…”

Section: Introductionmentioning

confidence: 99%

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Control Strategies for Enhancing Frequency Stability by DFIGs in a Power System with High Percentage of Wind Power Penetration

2017

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Nowadays, regarding high percentage of wind power penetration in power systems, operating conditions of power system necessitates wind turbine generators (WTGs) to contribute in frequency regulation of the system, similar to the conventional units. To reach this goal, active power output of WTGs must be controlled, but this issue distances the operating conditions of WTGs from maximum power point tracking (MPPT) mode. This paper initially presents a completed model of doubly fed induction generator (DFIG) for dynamic studies in frequency stability analysis. Next, a coordinated control strategy to regulate active power command set point (Pcmd) for individual WTGs in a wind farm (WF) and a control strategy to regulate wind power output of DFIG upon operator's request is presented. Stability is assured under different wind conditions in the proposed control strategy. Individual WTGs set point allocation is performed applying fuzzy logic controller (FLC), while emotional learning based intelligent controller is used in regulation of the coefficient in the DFIG to reach the best stability conditions. Simulation results, performed on a test system consisting of both conventional units and WTGs, validate the effectiveness of the proposed control strategy in comparison with other mentioned solutions.

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“…All of the described procedure is intended to trace the determined output power by WF control unit. The mechanical torque in the wind turbine shaft is calculated applying Equation (14).…”

Section: Mechanical Partmentioning

confidence: 99%

Section: Fuzzy Logic Controllermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Control Strategies for Enhancing Frequency Stability by DFIGs in a Power System with High Percentage of Wind Power Penetration

2017

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“…The generated power is divided between the stator and the rotor (9) in which P stands for active power. The torque equation and equation of motion are identical to (6) and (7) for the constant speed wind turbine.…”

Section: Table II Simulated Induction Generator Parametersmentioning

confidence: 99%

“…• they focus on one subsystem of the wind turbine generating system, such as the generator [1], [2], the drive train and mechanical structure [3], [4], or the controllers [5], 0885-8969/03$17.00 © 2003 IEEE [6], while neglecting the other subsystems, whereas for investigation of the impacts of wind power on power system dynamics complete models are necessary; • they are, although advanced, not very well documented and specified [7]; • they contain time constants which are too short to be taken into account in fundamental frequency simulations [8], [9]; • they model generating systems that are not applied in wind turbines anymore [10]. The contribution of this paper is threefold, because it presents models of widely used generating systems that…”

Section: Introductionmentioning

confidence: 99%

Representing wind turbine electrical generating systems in fundamental frequency simulations

Slootweg

Polinder

Kling

2003

IEEE Trans. On Energy Conversion

289

135

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Abstract-Increasing numbers of wind turbines are being erected. In the near future, they may start to influence the dynamics of electrical power systems by interacting with conventional generation equipment and with loads. The impact of wind turbines on the dynamics of electrical power systems therefore becomes an important subject, studied by means of power system dynamics simulations. Various types of power system dynamics simulations exist and the approach depends on the aspect of power system dynamic behavior being investigated.In this paper, the focus is on fundamental frequency simulations, also known as electromechanical transient simulations. In this type of simulation, the network is represented as an impedance matrix and only the fundamental frequency component of voltages and currents is taken into account in order to reduce the computation time. This simulation approach is mainly used for voltage and angle stability investigations. Models of wind turbine generating systems that match the fundamental frequency simulation approach are presented and their responses are compared to measurements.

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Current situation and development of wind power in China

Bao

2007

Front. Energy Power Eng. China

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The current development of wind power in China was presented in this paper. Many regions such as Xinjiang Uygur Autonomous Region, Inner Mongolia Autonomous Region and southeast coastal region, etc. in China have abundant wind energy resource. At the same time, the utili zation of wind power in China has been developing quickly and its prospect is promising in spite of many some obstacles. With the implementation of the Renewable Energy Law, some previous obstacles have been or are being eliminated. Much investment and many enterprises start to enter this field. In spite of this, there still exist some financial and technological obstacles. One of the technological obstacles is the stability of local power grid owing to the increasing proportion of the wind power capacity. Because the centralized development mode of wind power was adopted, the quick fluctuation of wind speed will influence the voltage and frequency stability of local power grid. In addition, large wind farm has little dispatching ability because of the uncontrollability, randomness and fluctuation of natural incoming wind. To erase these obstacles, a novel hybrid power system combining wind farm and small gas turbine power plants is discussed.

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A variable speed wind energy conversion scheme for connection to weak AC systems

Cited by 62 publications

References 4 publications

Control Strategies for Enhancing Frequency Stability by DFIGs in a Power System with High Percentage of Wind Power Penetration

Control Strategies for Enhancing Frequency Stability by DFIGs in a Power System with High Percentage of Wind Power Penetration

Representing wind turbine electrical generating systems in fundamental frequency simulations

Current situation and development of wind power in China

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