Analysis and Enhancement of Active Power Transfer Capability for DFIG-Based WTs in Very Weak Grid

Guo, Xiang; Zhu, Donghai; Zou, Xudong; Yang, Yin; Kang, Yong; Tang, Wangqianyun

doi:10.1109/jestpe.2021.3089235

Cited by 24 publications

(5 citation statements)

References 28 publications

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“…The overwhelming cost of power transmission network development and the need for improved transfer capability has raised significant concerns regarding distributed energy system planning [46,47]. Therefore, several correlational studies are being conducted to investigate the impact of voltage stability on the power transfer capability.…”

Section: Transfer Capability Evaluation Using Static Analysis Methodsmentioning

confidence: 99%

“…In addition, these indices can be classified according to the evaluation target, for example, according to the measurement target and the voltage instability mechanism. As per the voltage instability classification presented in [46,47], the areas that are most prone to voltage collapse in the power system can be identified through different VSIs. In [63] classification according to offline or online VSI applications was proposed, in which offline is suggested for VSI applications of buses and online is suggested for VSI applications of lines.…”

Section: Vsi Classificationmentioning

confidence: 99%

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Analytical Methods of Voltage Stability in Renewable Dominated Power Systems: A Review

2022

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The ongoing development of renewable energy and microgrid technologies has gradually transformed the conventional energy infrastructure and upgraded it into a modernized system with more distributed generation and localized energy storage options. Compared with power grids utilizing synchronous generation, inverter-based networks cannot physically provide large amounts of inertia, which means that more advanced and extensive studies regarding stability considerations are required for such systems. Therefore, appropriate analytical methods are needed for the voltage stability analysis of renewable-dominated power systems, which incorporate a large number of inverters and distributed energy sources. This paper provides a comprehensive literature review of voltage stability analyses of power systems with high levels of renewable energy penetration. A series of generalized evaluation schemes and improvement methods relating to the voltage stability of power systems integrated with various distributed energy resources are discussed. The existing voltage stability analysis methods and corresponding simulation verification models for microgrids are also reviewed in a systematic manner. The traditional and improved voltage stability analysis methods are reviewed according to the microgrid operation mode, the types of distributed generators, and the microgrid configurations. Moreover, the voltage stability indices, which play a crucial role in voltage stability assessments, are critically evaluated in terms of the applicable conditions. The associated modeling and simulation techniques are also presented and discussed. This contribution presents guidelines for voltage stability analysis and instability mitigation methods for modern renewable-rich power systems.

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Section: Transfer Capability Evaluation Using Static Analysis Methodsmentioning

confidence: 99%

Section: Vsi Classificationmentioning

confidence: 99%

Analytical Methods of Voltage Stability in Renewable Dominated Power Systems: A Review

2022

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“…The electric power system faces challenges of system frequency stability with highwind-power-penetrated power girds (Wang et al, 2020). The reasons for this phenomenon are explained as follows: doubly fed induction generators (DFIGs) are unable to sustain the system frequency since they decouple the speed of the rotor from the frequency (Xiong et al, 2020;Guo et al, 2022). This results in a reduction in the system inertia response and primary frequency response (Gevorgian et al, 2015;Yang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Dynamic power-based temporary frequency support scheme for a wind farm

You

Xu²,

Cao³

2022

Front. Energy Res.

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Doubly fed induction generators can participate in frequency support following a disturbance by releasing their rotational energies. However, when regaining the rotor speed, a secondary frequency dip (SFD) tends to produce a sudden output drop. This study suggests a dynamic power-based stepwise inertial control (IC) scheme of a wind power plant for minimizing the SFD while reducing the maximum frequency deviation (MFD), considering the non-negligible wake. To this end, the reference of the output power increases to the torque limit. Afterward, the power reference smoothly decays with the dynamically decreasing incremental power and then automatically switches to the maximum power point tracking operation. The performance of the temporary frequency support with the suggested stepwise IC strategy is investigated with various penetration levels of wind power. Test results demonstrate that the suggested stepwise IC strategy can minimize the SFD and reduce mechanical stresses on the wind turbine during the recovery of the rotor speed while reducing the MFD. Therefore, the suggested stepwise IC strategy secures the dynamic frequency stability of an electric power system dominated by wind power generations.

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“…However, with the continuous increase in wind power penetration, the power system has witnessed a significant reduction in inertia and damping levels. When disturbances occur, they can easily trigger frequency relays, leading to events such as generator tripping and load shedding, which pose a serious threat to the secure and stable operation of the power system, Yang et al (2023); Guo et al (2022); Xiong et al (2022); Zhang et al (2024). Therefore, maintaining grid frequency stability under high wind power penetration scenarios is very important.…”

mentioning

confidence: 99%

Frequency regulation strategy of direct drive permanent magnet synchronous wind power generation system based on RPC principle

Zhang,

Xia,

Zhang

et al. 2023

Front. Energy Res.

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The continuous integration of renewable energy into the grid has reduced its inertia and damping levels. When disturbances occur, the grid is prone to frequency excursion issues, which restrict the further utilization of renewable energy. Consequently, an increasing number of grid codes require active participation of renewable energy sources in the system’s frequency regulation (FR). Direct-drive permanent magnet synchronous wind power systems, characterized by their simple structure and high reliability, have gradually become the mainstream in wind power systems. By controlling the pitch angle to reserve surplus power, the wind turbines can actively engage in frequency regulation during disturbances. However, due to limited power reserve capacity, traditional FR methods struggle with parameters tuning, thus failing to achieve the desired effect. To this end, this paper proposes an FR strategy for direct-drive permanent magnet synchronous wind power systems based on the principle of rapid power compensation (RPC). It circumvents the challenges associated with parameter tuning, and achieves optimal FR performance for wind turbine inverter under power-limited conditions. Firstly, it is demonstrated that the proposed RPC control, when making full use of power reserves, can achieve FR effects equivalent to optimal PD control through rigorous mathematical analysis. Subsequently, the RPC control is divided into four operating modes to address FR requirements under different conditions. The transitions between these modes are explained, and the detailed implementation of the RPC control is provided. Finally, the effectiveness and superiority of the proposed control strategy are validated through simulation based on Matlab/Simulink.

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Analysis and Enhancement of Active Power Transfer Capability for DFIG-Based WTs in Very Weak Grid

Cited by 24 publications

References 28 publications

Analytical Methods of Voltage Stability in Renewable Dominated Power Systems: A Review

Analytical Methods of Voltage Stability in Renewable Dominated Power Systems: A Review

Dynamic power-based temporary frequency support scheme for a wind farm

Frequency regulation strategy of direct drive permanent magnet synchronous wind power generation system based on RPC principle

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