Stability and dynamic analysis of doubly-fed variable speed pump turbine governing system based on Hopf bifurcation theory

Gao, Chunyang; Yu, Xiangyang; Nan, Haipeng; Men, Chuangshe; Zhao, Peiyu; Cai, Qingsen; Fu, Jianing

doi:10.1016/j.renene.2021.05.015

Cited by 22 publications

(5 citation statements)

References 33 publications

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“…Guo and Zhu 36 described variable-speed PSP (VSPSP) as a fifth-order nonlinear system and analyzed its operational stability through mathematical methods. Gao et al 37 explored the stability of a VSPSU with a governing system under the condition of small power disturbance. Some of the operating characteristics of VSPSU in pump mode have also been studied.…”

Section: Literature Reviewmentioning

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: Literature Reviewmentioning

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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“…The hydraulic turbine control block diagram of the DFVSHU is shown in Figure 3, in which n opt is the optimal speed of the turbine, and u is the output of the speed controller. Details on the optimal speed generator have been provided by Gao et al (2021b).…”

Section: Hydraulic Turbine Control System Modelmentioning

confidence: 99%

“…The variable-speed hydropower unit (VSHU) employing power electronic technology has a fast response speed (Gao et al, 2021a) and does not have anti-regulation characteristics, making it possible to suppress the wind power fluctuations over a short time scale (Iliev et al, 2019). For example, the VSHU of the Ohkawachi Pumped Storage Plant in Japan can change the power output by at least 32 MW within 0.2 s. However, the present research on VSHUs mainly focuses on modelling and control strategy design (Gao et al, 2021b;Fu et al, 2022), and few studies have conducted quantitative analysis on the advancement of VSHUs in suppressing wind power fluctuations over short time scales. Therefore, three typical wind speed conditions are selected in this study to determine and quantify the advancement of VSHU in suppressing wind power fluctuations by using the power range, standard deviation, and fluctuation time.…”

Section: Introductionmentioning

confidence: 99%

Advancement and capacity allocation analysis of variable speed hydropower units for suppressing wind power fluctuations

Gao

Yu²,

Nan³

et al. 2022

Front. Energy Res.

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The advancement and capacity allocation of variable-speed hydropower units (VSHUs) for suppressing wind power fluctuations are studied. First, a wind–hydropower generation system model, comprising the doubly fed VSHU (DFVSHU) and full-size power VSHU (FSVSHU) is established. Then, three typical operating conditions, namely the wind speed step-up, wind speed sudden drop, and wind gust, are selected to quantify the advantages of the VSHU in suppressing wind power fluctuations using the power range, power standard deviation, and power fluctuation time. Finally, a VSHU capacity allocation scheme in which some FSHUs are transformed into VSHUs for the same total capacity of hydropower units is proposed. A VSHU capacity allocation formula based on this scheme is also proposed. Simulations and comparisons reveal that the VSHU can effectively suppress wind power fluctuations over short time scales, and its effectiveness is 90% higher than that of the FSHU. In addition, the simulation based on the measured wind speed data verifies the effectiveness of the capacity allocation formula. This study provides a new method for suppressing wind power fluctuations over short time scales and provides theoretical guidance for the application of VSHUs through capacity allocation.

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“…The mechanism of valve destabilization is investigated [15]. The stability of a doubly-fed variable-speed pump-turbine regulation system under low-power disturbance conditions is investigated [16]. The algebraic stability criterion of the system in turbine and pump modes is derived using Hopf bifurcation theory.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamics of Pilot-Operated Hydraulic Control Valves for Submersible Based on Improved Newmark- Integration Method

Li,

Zhang,

Lian

et al. 2023

IEEE Access

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Submersible is an important equipment for the development and utilization of marine resources. The pilot-operated hydraulic control valves have an extremely wide range of applications in the buoyancy adjustment system of submersibles. The existing hydraulic control valves have insufficient flow rate and pressure adjustment ability in a wide range of system pressures. A pilot-operated hydraulic control valve with a wide range of adjustable pressures, a high flow rate control accuracy, and anti-turbulence and cavitation is designed. A joint simulation method combining MATLAB/Simulink and UDF dynamic mesh is developed. The dynamic characteristics of the piping system and pilot-operated hydraulic control valve under different system inlet pressures are investigated by using the metric cellular automata technology and one-and threedimensional co-simulation platforms. The results of the joint simulation show that: the flow rate of the system stabilizes for a period at a system inlet pressure of 1.6 MPa, and the phenomena such as fluctuations and oscillations will occur after a period. To address this phenomenon, an improved Newmark-β integration method is proposed based on establishing a correct nonlinear model. The established model is solved in a longer time domain to obtain the nonlinear dynamic bifurcation behavior of the model. The stability of the pilot-operated hydraulic control valve is analyzed by displacement dynamic response diagrams, phase space trajectory diagrams, and bifurcation diagrams. A direction is provided for the applied research of nonlinear system bifurcation theory in self-operated valves.

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Stability and dynamic analysis of doubly-fed variable speed pump turbine governing system based on Hopf bifurcation theory

Cited by 22 publications

References 33 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

Advancement and capacity allocation analysis of variable speed hydropower units for suppressing wind power fluctuations

Nonlinear Dynamics of Pilot-Operated Hydraulic Control Valves for Submersible Based on Improved Newmark- Integration Method

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