Analysis, simulation and testing of the ZVRT capability of a wind turbine with a doubly fed induction generator

Cai, Enyu; Liao, Xiaozhong; Dong, Lei; Li, Yongzhan; Jiao, Chong

doi:10.1049/iet-rpg.2019.1315

Cited by 4 publications

(2 citation statements)

References 18 publications

(57 reference statements)

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“…It starts at the 4 s when the fault-point voltage drops to 0 instantly. The fault clears in 4.43 s, lasting 430 ms [31,32]. The simulation will compare the performance of the following 3 groups:…”

Section: Simulation and Discussionmentioning

confidence: 99%

Control Strategy of Doubly-Fed Induction Generator under Zero Voltage Fault of Power Grid

Yang

Liang

et al. 2022

Sustainability

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For improving the zero-voltage ride through the capability of a doubly fed induction generator in high proportion new energy grid in extreme faults, a coordinated control scheme of hardware and optimal control strategy is proposed. A high-temperature superconductive-fault current limiter suppresses stator fault current, adaptive virtual impedance control and active dynamic reactive power support control act on the back-to-back converter of wind turbines as optimal control strategies. Optimizing the control strategy without changing the controller structure is beneficial to engineering implementation. After mathematical derivation and simulation verification, the coordinated control strategy adopted in this paper can effectively avoid the rotor current and voltage exceeding the limit when the wind turbine is facing extreme faults, actively provide reactive power support for the busbar, realize zero voltage ride through and reduce the risk of high voltage failure at the point of failure. The control effect is obviously better than the traditional virtual impedance control.

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Section: Simulation and Discussionmentioning

confidence: 99%

Control Strategy of Doubly-Fed Induction Generator under Zero Voltage Fault of Power Grid

Yang

Liang

et al. 2022

Sustainability

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“…Under severe voltage sag, the rotor windings are short‐circuited by a crowbar circuit, and the DC side of the B2B converter is short‐circuited by a chopper circuit to avoid overcurrent in the converter. This causes the doubly fed generator to operate as a squirrel cage machine, absorbing reactive power for excitation from the grid and aggravating the voltage sag [7]. Under the condition of a high‐voltage fault, control systems with low withstand voltage levels such as yaw and pitch systems need to switch to an uninterruptible power supply to avoid insulation damage [8].…”

Section: Introductionmentioning

confidence: 99%

Improvement of voltage adaptability for decentralised doubly‐fed induction generator wind power system based on nine‐switch converter

Ren

et al. 2022

IET Renewable Power Gen

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This paper proposes a method to improve the voltage adaptability of doubly fed induction generator (DFIG) wind turbines in a decentralised scenario by incorporating a nine‐switch converter (NSC). With the proposed scheme, the DFIG can realise low voltage ride‐through (LVRT) and continuous operation under the grid voltage harmonic, drop, and rise. The topology of the NSC‐DFIG system is introduced and is used to solve the circuit model. Control strategies for voltage compensation and current compensation are based on the circuit model. The corresponding voltage compensation scheme and the NSC DC voltage control scheme were designed according to the specific capacity configuration of the NSC in this study. To reduce the DC‐side voltage of the NSC, a third harmonic‐injection modulation method and a dynamic modulation ratio allocation strategy were incorporated. Simulations under four power grid voltage conditions were used to validate the scheme. This method can improve the voltage adaptability for decentralised DFIG wind power systems, which can enable their successful interactions with the power grid.

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A reduced-order model for representing the reactive power response of a doubly fed wind turbine during ZVRT

Cai

Dong

Liao

2021

Journal of Renewable and Sustainable Energy

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Zero-voltage ride through (ZVRT) is the worst-case scenario of low-voltage ride through (LVRT), which indicates the optimal fault-response capability of wind turbines (WTs). The reactive response during ZVRT shows the dynamic performance of WTs during extreme grid faults, which greatly improves the flexibility and robustness of renewable-rich grids. The reactive response of a doubly fed (type-3) WT during ZVRT depends on the control strategy of the converter and the steady-state and transient-state performance of the doubly fed induction generator (DFIG). This paper proposes a reduced-order model for representing the reactive response of a type-3 WT during ZVRT including the control strategy of the converter and the equivalent electric circuit of the DFIG, which simplifies some complicated equations but is practical for modeling a renewable-rich power system in most cases. Some simplified expressions between the reactive energy and a single DFIG parameter are presented, which could satisfy the demands of designing a DFIG. Finally, the method of model consistency verification, the influence analysis of DFIG parameters on the reactive response, the reasonable ranges of DFIG parameters and the fault-response performance of the WT in the theoretically longest ZVRT period are also obtained for reference.

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Analysis, simulation and testing of the ZVRT capability of a wind turbine with a doubly fed induction generator

Cited by 4 publications

References 18 publications

Control Strategy of Doubly-Fed Induction Generator under Zero Voltage Fault of Power Grid

Control Strategy of Doubly-Fed Induction Generator under Zero Voltage Fault of Power Grid

Improvement of voltage adaptability for decentralised doubly‐fed induction generator wind power system based on nine‐switch converter

A reduced-order model for representing the reactive power response of a doubly fed wind turbine during ZVRT

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