Direct Power Control of DFIG System Without Phase-Locked Loop Under Unbalanced and Harmonically Distorted Voltage

Large-scale wind turbines have become the trend of the wind power industry. However, the main factors restricting the large scale wind turbines are frequent replacement of carbon brush and slip ring and the harmonic of the stator current in double-fed induction generator, plus converters' large volume, high cost, and high failure rate in full power converter of wind turbine. Therefore, new double rotor speed-regulating wind power generation system comprising a double rotor speed-regulating device connected to the gearbox and the synchronous generator is proposed for the sake of lower cost, higher reliability, and stronger adaptability of the power grid. The structure of the system and the connection of each component are described; meanwhile, the working principle of the system under different operating conditions is analyzed. Furthermore, the mathematical model of the system is established, besides the control strategy being proposed. The simulation results verify the correctness of the mathematical model and the control strategy.

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“…The torque transmission of the speed-regulating generator as shown in formula (3) can be deduced by the formula (2).…”

Section: Working Principlementioning

confidence: 99%

“…Meanwhile, the carbon brushes and slip rings are available in the generator rotor [2]. In general, the carbon brush is replaced every 6 months and the slip ring is replaced every 2 years, resulting in the high maintenance frequency and high cost [3].…”

Section: Introductionmentioning

confidence: 99%

Study of double rotor speed-regulating wind power generation system

Yang

Wang

2018

J Wireless Com Network

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“…However, it may incur additional computational burden. In addition, Cheng and Nian proposed a virtual synchronous reference frame based DPC for VSI in [44] and extended it to doubly fed induction generator system with consideration of unbalance grid voltage and harmonically distorted voltage conditions [45], [46]. They used a virtual phase angle instead of the voltage phase angle acquired by PLL for coordinate transformations, and apply the reduced-order vector integrators to directly regulate the power pulsations.…”

Section: Introductionmentioning

confidence: 99%

Vector Current Control Derived from Direct Power Control for Grid-Connected Inverters

Gui

Wang

Blaabjerg

2019

IEEE Trans. Power Electron.

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We propose a vector current control derived from direct power control (VCC-DPC) for a three-phase voltage source inverter (VSI) in the synchronous rotating frame through instantaneous real and reactive powers. The proposed VCC-DPC method has the same control structure as the conventional VCC except for the coordinate transformation, since we obtain the d-q axes currents model of VSI without using Park transformation and the PLL system. Consequently, the proposed method has the same property as the conventional VCC if the PLL extracts the phase angle of the grid voltage correctly. However, with the consideration of the slow dynamics of the PLL, the proposed method has an enhanced dynamical performance feature compared with the conventional VCC. Moreover, it has another benefit that the reduction of the computational burden could be expected since there is no Park transformation and the PLL in the controller implementation. We can guarantee that the closed-loop system with the proposed method is exponentially stable in the operating range. Finally, both simulation and experimental results using a 15-kW-inverter system match the theoretical expectations closely. Index Terms-Voltage source inverter, vector current controller, instantaneous real and reactive powers, exponentially stable.

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“…PLLs need to faithfully track the grid voltage parameters for effective control of grid interfaced power converters such as shunt and series compensators. Their use in the design of controllers for DSTATCOM, micro‐grids and doubly‐fed induction generators are discussed. The use of computationally less intensive PLL‐less strategy is also interesting and discussed.…”

Section: Introductionmentioning

confidence: 99%

Design and performance analysis of improved Adaline technique for synchronization and load compensation of grid‐tied photovoltaic system

Saxena

Singh

Nath

2020

Int Trans Electr Energ Syst

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Summary The paper discusses the design, modeling, simulation, and implementation of improved Adaline technique, which has been used for grid synchronization as well as extended further for load compensation. A simple but effective method is proposed to improve the performance of the conventional Adaline technique. The conventional Adaline controller uses a fixed learning rate while the proposed Adaline is developed using variable learning, which improves both the steady‐state and dynamic response. Simulation and experimental results have been demonstrated, which confirm the feasibility of the proposed approach. Suitable performance comparisons highlight the effectiveness of the proposed approach.

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Direct Power Control of DFIG System Without Phase-Locked Loop Under Unbalanced and Harmonically Distorted Voltage

Cited by 63 publications

References 25 publications

Study of double rotor speed-regulating wind power generation system

Study of double rotor speed-regulating wind power generation system

Vector Current Control Derived from Direct Power Control for Grid-Connected Inverters

Design and performance analysis of improved Adaline technique for synchronization and load compensation of grid‐tied photovoltaic system

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