Quantitative stability analysis of complex nonlinear hydraulic turbine regulation system based on accurate calculation

Chen, Jinbao; Zheng, Yang; Liu, Dong; Du, Yang; Xiao, Zhihuai

doi:10.1016/j.apenergy.2023.121853

Cited by 10 publications

(2 citation statements)

References 31 publications

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“…In rated operating conditions, it is possible to approximate all coefficients in Equation (8) as constants. Based on the literature [27], the standard parameters were set as ∂p m /∂h = 1.5, ∂p m /∂n = 0, ∂p m /∂y = 1, ∂q t /∂h = 0.5, ∂q t /∂n = 0, and ∂q t /∂y = 1. Consequently, the turbine system's transfer function, which accounts for the water hammer effect, was derived as Equation (9).…”

Section: Hydraulic Turbine Systemmentioning

confidence: 99%

A Novel Control Strategy for Hydraulic Turbines to Consider Both Primary Frequency Regulation and Ultra-Low Frequency Oscillation Suppression

Jia,

Tan,

Zhang

et al. 2024

Energies

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In response to the requirements of mitigating ultra-low frequency oscillation (ULFO) and enhancing primary frequency regulation (PFR) performance in hydropower-dominated systems, a novel control strategy, namely the center-frequency-structured governor-side power system stabilizer (CFS_GPSS) is proposed. In this study, the transfer function model of the hydropower system with a proportional-integral-derivative (PID)-type governor is established. Through analysis of damping torque and amplitude-frequency characteristics, the dominant links and key characteristics of ULFO are revealed. Based on these findings, a CFS_GPSS strategy is proposed to compensate for the phase and increase system damping. Finally, the effectiveness of the CFS_GPSS is verified under normal operating conditions of 0.04 Hz, strong network and low hydropower output conditions of 0.034 Hz, and weak grid-connected conditions of 0.054 Hz based on the 3-machine, 9-bus system. Compared to the conventional structured governor-side power system stabilizer (CS_GPSS) control strategy and PID parameter optimization method, the CFS_GPSS demonstrates efficient ULFO suppression across a wide frequency range while significantly enhancing PFR performance. The proposed control strategy exhibited the expected performance under various operating conditions, providing effective technical means to enhance the reliability of hydraulic turbines and guide the safe and stable operation of hydropower-dominated systems.

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Section: Hydraulic Turbine Systemmentioning

confidence: 99%

A Novel Control Strategy for Hydraulic Turbines to Consider Both Primary Frequency Regulation and Ultra-Low Frequency Oscillation Suppression

Jia,

Tan,

Zhang

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…For a large amount of high residual pressure liquids in industries such as petrochemical, petroleum processing, seawater desalination, and steel metallurgy, pressure-reducing valves or orifice plates are usually used to reduce these fluids to the required low pressure, which means that large pressure energy in fluids is wasted [1][2][3][4][5][6]. To reduce energy waste, some enterprises use hydraulic turbine devices to recycle and utilize pressure energy [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence Analysis of Runner Inlet Diameter of Hydraulic Turbine in Turbine Mode with Ultra-Low Specific Speed

Chen,

Zheng,

Zhang

et al. 2023

Energies

Self Cite

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The hydraulic turbine in turbine mode (HTTM) with an ultra-low specific speed (HTTM-ULSS) has the advantages of a simplified structure, high efficiency, and good stability and has great application value in the industry. However, the influence of the runner inlet diameter (D1) on the performance of HTTM-ULSS has not yet been fully studied. Therefore, the three-dimensional models of Francis runners were established in the ultra-low specific speed range by examining D1 = 0.49 m, 0.5 m, and 0.51 m, and the two-stage hydraulic turbine models were constructed with flow passage components. Then, internal flow and energy characteristics were calculated using Fluent 16.0 software. Further, the influence of D1 on HTTM performance was studied by comparing numerical simulation results. The results show that the water head of the HTTM-ULSS can reach 540.87 m when D1 = 0.51 m, showing its powerful ability to recover the pressure energy in high-pressure water. Moreover, the head and efficiency are closely related to D1; when D1 increases, the circulation at the runner inlet increases, resulting in an enhancement in the ability to recover the water head and decreases in efficiency and in the operating range of the high-efficiency zone; with D1 increasing, the flow pattern inside the runner becomes better, but the high-pressure area of the blade increases. When selecting the D1, attention should not only be paid to the ability to recover the water head but also to the pressure of the runner blades and the internal water flow pattern.

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Generalized predictive control application scheme for nonlinear hydro-turbine regulation system: Based on a precise novel control structure

Chen,

Liu,

Wang

et al. 2024

Energy

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Quantitative stability analysis of complex nonlinear hydraulic turbine regulation system based on accurate calculation

Cited by 10 publications

References 31 publications

A Novel Control Strategy for Hydraulic Turbines to Consider Both Primary Frequency Regulation and Ultra-Low Frequency Oscillation Suppression

A Novel Control Strategy for Hydraulic Turbines to Consider Both Primary Frequency Regulation and Ultra-Low Frequency Oscillation Suppression

Influence Analysis of Runner Inlet Diameter of Hydraulic Turbine in Turbine Mode with Ultra-Low Specific Speed

Generalized predictive control application scheme for nonlinear hydro-turbine regulation system: Based on a precise novel control structure

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