Analysis of hydro-coupled power plants and design of robust control to damp oscillatory modes

Pico, Hugo Villegas; Aliprantis, Dionysios; McCalley, James D.; Elia, Nicola; Castrillón, N. J.

doi:10.1109/pesgm.2015.7285611

Cited by 2 publications

(3 citation statements)

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“…The fractional order model of the oil film forces can be described as (7) where F x0−off and F y0−off are the oil-film forces at the quiescent operation point and the symbols k xx , k xy , k yx , k yy , c xx , c xy , c yx , and c yy are the linearized stiffness and damping coefficients.…”

Section: Htgumentioning

confidence: 99%

“…[1] As two core parts of the hydropower station, the nonlinear analysis of the hydro-turbine governing system (HTGS) and hydro-turbine generator unit (HTGU) has attracted wide interest from scholars. [2][3][4][5][6][7][8][9] The development of the nonlinear theory and the introduction of the fractional order makes analysis on the nonlinear behaviors more diverse. [10][11][12][13][14][15][16][17][18][19][20] Related researches gradually evolved from the single subsystem to the internal connection of overall system.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear fast–slow dynamics of a coupled fractional order hydropower generation system

Gao¹,

Chen

Zhang³

et al. 2018

Chinese Phys. B

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Internal effects of the dynamic behaviors and nonlinear characteristics of a coupled fractional order hydropower generation system (HGS) are analyzed. A mathematical model of hydro-turbine governing system (HTGS) with rigid water hammer and hydro-turbine generator unit (HTGU) with fractional order damping forces are proposed. Based on Lagrange equations, a coupled fractional order HGS is established. Considering the dynamic transfer coefficient eis variational during the operation, introduced e as a periodic excitation into the HGS. The internal relationship of the dynamic behaviors between HTGS and HTGU is analyzed under different parameter values and fractional order. The results show obvious fast-slow dynamic behaviors in the HGS, causing corresponding vibration of the system, and some remarkable evolution phenomena take place with the changing of the periodic excitation parameter values.

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Section: Htgumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear fast–slow dynamics of a coupled fractional order hydropower generation system

Gao¹,

Chen

Zhang³

et al. 2018

Chinese Phys. B

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show abstract

“…Meanwhile, a practical PID parameter tuning strategy for the hydraulic turbine governor is proposed to suppress the ULFO. Reference [12] designed a full-feedback robust stabilization controller to suppress the oscillations, and the method can effectively improve the speed performance of a black start. Reference [13] used a QSS model to efficiently coordinate the design of PSS4B type stabilizers to improve frequency dynamics.…”

Section: Introductionmentioning

confidence: 99%

Research on Ultra-Low-Frequency Oscillation Suppression Method of High-Head, Large-Capacity Hydropower Units

Zhang,

Li,

Liu

et al. 2024

Energies

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Aiming at the problem of ultra-low-frequency oscillation (ULFO) caused by an irrational setting of governor parameters of high-head hydraulic turbine units, this paper proposes a method to optimize the additional damping control parameters of the governor to suppress ULFO. Firstly, the mechanism of ULFO is elaborated and the effect of system damping torque on ULFO is analyzed. Secondly, Hamilton’s theory is used to rank the magnitude of each unit’s contribution to the ULFO. Then, the parameters of the damping controller are optimized using the variational modal decomposition–Hilbert transform method and the Grey Wolf Optimization algorithm. It realizes the phase compensation of the hydroelectric unit governor and suppresses the ultra-low-frequency oscillation. Finally, the proposed method is validated using the simulation conducted in CloudPSS. The test results indicate that the proposed method can effectively suppress the ULFO caused by the high-head hydroelectric unit.

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Analysis of hydro-coupled power plants and design of robust control to damp oscillatory modes

Cited by 2 publications

References 0 publications

Nonlinear fast–slow dynamics of a coupled fractional order hydropower generation system

Nonlinear fast–slow dynamics of a coupled fractional order hydropower generation system

Research on Ultra-Low-Frequency Oscillation Suppression Method of High-Head, Large-Capacity Hydropower Units

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