Doubly Fed Induction Generator Wind Turbine Systems Subject to Recurring Symmetrical Grid Faults

Chen, Wenjie; Blaabjerg, Frede; Zhu, Nan; Chen, Min; Xu, Dehong

doi:10.1109/tpel.2015.2418791

Cited by 34 publications

(25 citation statements)

References 32 publications

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“…As it can be seen from Fig. 1, the RSC performs effective control of the DFIG stator output power through the rotor current control, the GSC keeps a constant and stable dc-link voltage, either LCL filter [11]- [13] or L filter [6]- [10], [14]- [18] can be adopted to filter out the switching harmonics. A three-terminal step-up transformer is always connected between the DFIG machine stator winding, the GSC output LCL filter and the Point of Common Coupling (PCC) to increase the voltage level of the DFIG system.…”

Section: A Description Of the Dfig System And Weak Networkmentioning

confidence: 99%

“…where, G c (s) is the PI current controller in (1), G d (s) is the digital control delay in (14), G p (s) is the control subject DFIG transfer function defined as G p (s) = 1/(R r +sσL r ) in [16], R r is the rotor resistance, L r = L m + L σr is the rotor inductance, L m is the mutual inductance, L σr is the rotor leakage inductance.…”

Section: Influence Of the Current Controller Parametersmentioning

confidence: 99%

“…Unfortunately, due to the direct connection of the stator winding to the power network, the DFIG based wind power system is comparatively more sensitive to the power network variation, including voltage unbalance [6]- [10], low voltage fault [11]- [14], distortion [15]- [18], and also potential resonance due to a comparatively large impedance of the weak network.…”

Section: Introductionmentioning

confidence: 99%

“…However, the digital control delay is inevitable in the DFIG system as discussed in (14) and as a consequence the originally introduced virtual positive resistance can be transformed into the combination of positive resistance and positive capacitance as illustrated in Fig. 29,…”

Section: A Introduction Of Virtual Impedancementioning

confidence: 99%

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Overview of DFIG-Based Wind Power System Resonances Under Weak Networks

Song

Blaabjerg

2017

IEEE Trans. Power Electron.

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128

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-The wind power generation techniques are continuing to develop and increasing numbers of Doubly Fed Induction Generator (DFIG)-based wind power systems are connecting to the on-shore and off-shore grids, local standalone weak networks, and also micro grid applications. The impedances of the weak networks are too large to be neglected and require careful attention. Due to the impedance interaction between the weak network and the DFIG system, both SubSynchronous Resonance (SSR) and High Frequency Resonance (HFR) may occur when the DFIG system is connected to the series or parallel compensated weak network respectively. This paper will discuss the SSR and the HFR phenomena based on the impedance modeling of the DFIG system and the weak networks, and the cause of these two resonances will be explained in details. The following factors including 1) transformer configuration; 2) different power scale of DFIG system with different parameters; 3) L or LCL filter adopted in the Grid Side Converter (GSC); 4) rotor speed; 5) current closed-loop controller parameters and 6) digital control delay will be discussed in this paper. On the basis of the analysis, active damping strategies for HFR using virtual impedance concept will be proposed.

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Section: A Description Of the Dfig System And Weak Networkmentioning

confidence: 99%

Section: Influence Of the Current Controller Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: A Introduction Of Virtual Impedancementioning

confidence: 99%

See 2 more Smart Citations

Overview of DFIG-Based Wind Power System Resonances Under Weak Networks

Song

Blaabjerg

2017

IEEE Trans. Power Electron.

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128

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“…As the distributed generation develops fast, the increasing capacity of wind power generation has been achieved by connecting more and more DFIG based wind turbine systems to offshore and distributed networks [4]- [8]. These types of networks are typically smaller scale weak networks with comparatively large network impedances compared to the stiff grid network.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Active Damping of Multiple High Frequency Resonances in DFIG System

Song¹,

Blaabjerg²,

Wang³

2017

IEEE Trans. Energy Convers.

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As the wind power generation develops, the Doubly Fed Induction Generator (DFIG) based wind power system are more and more likely to operate in the emerging weak network rather than the conventional stiff network. Due to the comparatively large impedance of the weak network than the stiff grid, the DFIG system may be subject to the resonances due to the impedance interaction between the DFIG system and the weak network. Especially, when connected to a series π sections weak network, the Multiple High Frequency Resonances (MHFR) may occur and require careful studies. The impedance modeling of the DFIG system and the series π sections weak network is firstly demonstrated in this paper. Then, due to the multiple magnitude peaks of the series π sections of the weak network, the MHFR will be produced and can be theoretically explained based on the impedance modeling results. For the purpose of mitigating the MHFR, an active damping strategy which introduces a virtual impedance, including a phase leading compensation unit and a virtual positive resistance, is proposed and demonstrated. Simulations are conducted to validate the DFIG system MHFR as well as the proposed active damping strategy.Index Terms -DFIG system; series π sections weak network; multiple high frequency resonances; virtual impedance; active damping.The authors are with the

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Active damping of resonances in DFIG system with cascade converter under weak grid

Din

Zhang

et al. 2019

Int Trans Electr Energ Syst

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Summary The interaction of impedance between the doubly fed induction generator (DFIG) system and series‐compensated weak grid gives rise to an issue of subsynchronous resonance (SSR). Likewise, the high‐frequency resonance (HFR) occurs when a DFIG system is connected to parallel‐compensated weak grid. This paper proposes an improved method to mitigate the caused resonance. The improved method, based on impedance modeling, utilizes an additional cascaded converter (CC) at Y‐point of DFIG stator winding with virtual impedance implemented at the CC control unit, which reshapes the DFIG impedance for effective mitigation of both SSR and HFR. The virtual impedance is disabled when DFIG operated in series‐compensated weak grid, while enabled when working in parallel‐compensated weak grid, which effectively damps the HFR. A detailed theoretical explanation and impedance modeling of the CC has been given. The effectiveness of the proposed method has been validated through MATLAB simulations based on a 2‐MW DFIG system.

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Doubly Fed Induction Generator Wind Turbine Systems Subject to Recurring Symmetrical Grid Faults

Cited by 34 publications

References 32 publications

Overview of DFIG-Based Wind Power System Resonances Under Weak Networks

Overview of DFIG-Based Wind Power System Resonances Under Weak Networks

Analysis and Active Damping of Multiple High Frequency Resonances in DFIG System

Active damping of resonances in DFIG system with cascade converter under weak grid

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