Grid-Connection Control of Doubly Fed Variable Speed Pumped Storage Unit

Gong, Guoxian; Lv, Jingliang; Jiang, Xinjian; Sun, Xudong

doi:10.1109/icgea51694.2021.9487601

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Wang et al 27 proposed an optimization step of VSPSU based on the experiment curve and quantified the power regulation range and the regulation capacity of VSPSU based on physical model experiments. Gong et al 28 proposed a primary frequency regulation control strategy for the VSPSU with DFIM to participate in the power grid, of which the goal is to control the unit speed with a coordinated control strategy. Nahak et al, 29 Nahak and Satapathy, 30 and Satapathy et al 31 explored the PID governor parameters and proposed a coordinated modified pumped storage governor with a fractional parallel unified power flow controller to damp angular frequency variations in the power system.…”

Section: Introductionmentioning

confidence: 99%

Quantifying power regulation characteristics in pump mode of variable‐speed pumped storage unit with DFIM

Liu,

Yang,

Yang

et al. 2024

Energy Science & Engineering

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Pumped storage plants (PSPs) play an important role in renewable energy consumption in power systems. Variable‐speed technology is a new and critical direction for the development of PSPs. In pump mode, variable‐speed pumped storage units (VSPSUs) have wider power regulation ranges and more flexible power responses than fixed‐speed pumped storage units (FSPSUs); however, the corresponding quantification study of VSPSUs is rare. Therefore, this study aims to quantify the static and dynamic power regulation characteristics of VSPSU in pump mode. First, the modeling of the fast speed control strategy of VSPSU in pump mode is improved. Then, the power regulation range of the VSPSU is explored. The factors (i.e., power command, governor, and converter) affecting the power response rapidity are quantified through the engineering case of a variable‐speed PSP adopting the doubly fed induction machine. Accordingly, suggestions on the settings of the parameters are provided. Quantification results show that parameter tuning based on this study effectively solves the problem of low regulation rate caused by great power fluctuations under typical power regulation cases in pump mode. This VSPSU has the fastest regulation rate of 13.75%/s when adjusting 40% power. This study could provide technical support to the practical operation of VSPSU.

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Section: Introductionmentioning

confidence: 99%

Quantifying power regulation characteristics in pump mode of variable‐speed pumped storage unit with DFIM

Liu,

Yang,

Yang

et al. 2024

Energy Science & Engineering

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Improved Soft-Starting Method for Doubly Fed Induction Machines Based on Standstill Rotor-Side Synchronization

Mahtani,

Guerrero,

Sánchez

et al. 2024

Electronics

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This paper addresses the challenge of developing a cost-effective and efficient soft-starting method for doubly fed induction machines (DFIMs), a critical requirement for various industrial applications, such as pumped-storage hydropower. The research aims to improve a previously developed starting method by introducing a rotor-side synchronization technique at standstill conditions, which simplifies the starting process and eliminates the need for additional equipment such as autotransformers, resistors, or auxiliary converters. The proposed method begins with the stator winding being fed directly from the power system, while the rotor-side converter adjusts the voltage and frequency to achieve synchronization. Once synchronized, the rotor frequency is gradually reduced by the converter, resulting in a smooth acceleration of the machine. The methodology is validated through a combination of simulations and experimental testing, demonstrating the effectiveness of the proposed approach. The results reveal smooth startup dynamics, with significant reductions in electrical stress, operational complexity, and converter sizing requirements compared to existing methods. Notably, the magnetizing current is supplied directly by the power system through the stator, reducing the burden on the rotor converter by 60% compared to the previous method. The conclusions highlight the method’s robustness and its potential as a superior alternative to existing DFIM starting techniques.

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A Soft Start Method for Doubly Fed Induction Machines Based on Synchronization with the Power System at Standstill Conditions

Guerrero,

Mahtani,

Aranzabal

et al. 2024

Machines

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Due to their exceptional operational versatility, doubly fed induction machines (DFIM) are widely employed in power systems comprising variable renewable energy-based electrical generation sources, such as wind farms and pumped-storage hydropower plants. However, their starting and grid synchronization methods require numerous maneuvers or additional components, making the process challenging. In this paper, a soft start method for DFIM, inspired by the traditional synchronization method of synchronous machines, is proposed. This method involves matching the frequencies, voltages, and phase angles on both sides of the main circuit breaker, by adjusting the excitation through the controlled power converter at standstill conditions. Once synchronization is achieved, the frequency is gradually reduced to the rated operational levels. This straightforward starting method effectively suppresses large inrush currents and voltage sags. The proposed method has been validated through computer simulations and experimental tests, yielding satisfactory results.

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Grid-Connection Control of Doubly Fed Variable Speed Pumped Storage Unit

Cited by 3 publications

References 7 publications

Quantifying power regulation characteristics in pump mode of variable‐speed pumped storage unit with DFIM

Quantifying power regulation characteristics in pump mode of variable‐speed pumped storage unit with DFIM

Improved Soft-Starting Method for Doubly Fed Induction Machines Based on Standstill Rotor-Side Synchronization

A Soft Start Method for Doubly Fed Induction Machines Based on Synchronization with the Power System at Standstill Conditions

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