Dynamic Model of Kaplan Turbine Regulating System Suitable for Power System Analysis

Zhao, Jie; Wang, Li; Liu, Dichen; Wang, Jun; Zhao, Yu; Tian, Liang; Wang, Haoyu

doi:10.1155/2015/294523

Cited by 11 publications

(6 citation statements)

References 18 publications

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“…Several methods are typically used to reflect the key parameters at each moment in the flow field in the flow channel. One is to use the one-dimensional method of characteristics (1D-MOC) [1,5] and transfer function method (TFM) [6] et al to establish a numerical model of the entire flow channel of the turbine. The 1D transient process analysis simplifies the complicated water diversion system and equipment into simple pipelines and simplified models.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Mechanism of the Wicket Gate Closing Law for High-Head Pumped Storage Power Stations

et al. 2021

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The high-head pumped storage power station (PSPS) has complex working conditions and severe transient processes. Under load rejection conditions, the turbine speed and the flow channel pressure will threaten the unit. By adjusting the wicket gate closing law (WGCL), we can effectively alleviate the adverse effects of the transient process. In this study, a full flow channel refined model of a high-head PSPS was constructed, and the influence mechanism of load rejection conditions on key parameters was analyzed by tracking the operating trajectory on the S characteristic curves and simulating the transient flow field inside the pumped turbine by three-dimensional computational fluid dynamics (3D-CFD). Given the contradiction between different parameters in the wicket gate closing process, a third-generation nondominated genetic algorithm based on reference point selection (NSGA-III) was introduced, and a highdimensional multi-objective WGCL optimization model was constructed. We compared parameter changes in the two-phase and three-phase WGCL optimized elite solutions and explained the rationality of adopting the three-phase WGCL in high-head PSPSs. By proposing an improved three-phase WGCL, a new scheme-the most suitable WGCL under load rejection-was obtained through precise optimization. The research embodied the excellent effect of the heuristic multi-objective (MO) optimization algorithm based on the Pareto strategy in solving the operation problem of the large fluctuation transient process of hydraulic machinery. It revealed the theoretical basis of engineering adjustment for the safe production and operation of hydropower. INDEX TERMS pumped storage power station, one-dimensional method of characteristic, multi-objective wicket gate closing law optimization, non-dominant genetic algorithm based on reference point selection (NSGA-III)

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Section: Introductionmentioning

confidence: 99%

Optimization and Mechanism of the Wicket Gate Closing Law for High-Head Pumped Storage Power Stations

et al. 2021

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“…Energies 2021, 14, 2604 2 of 15 Results from Zhao et al [7] have shown that small turbines present lots of potential for generating high-efficiency hydropower, whilst also showing increased flexibility over larger turbines during times of lower power demand.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on the Influence of Blade Number in a Small Water Turbine

2021

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This paper demonstrates the procedure of blade adjustment in a Kaplan-type water turbine, based on calculations of the flow system. The geometrical adjustment of a twisted blade with varying chord length is described in the study. Computational fluid dynamics (CFD) analysis was used to characterise aerofoil and turbine performance. Furthermore, two turbines, with a different number of blades, were designed, manufactured, and tested experimentally. The numerical model results were then compared with the experimental data. The studies were carried out with different rotational velocities and different stator blade incidence angles. The paper shows a comparison of the turbine efficiencies that were assessed, using numerical and experimental methods, of a flow system with four- and five-bladed rotors. The numerical model results matched up well with those of the experimental study. The efficiency of the proposed turbines reached up to 72% and 84% for four-bladed and five-bladed designs, respectively. These efficiencies, when considered with the turbine’s simplicity, low production and maintenance costs, as well as their potential for harvesting energy from low energy flows, mean that Kaplan turbines provide a promising technology for processing renewable energy.

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“…To overcome this problem, the measured data composed of different heads and loads under various working conditions can be combined with appropriate algorithms to construct more accurate nonlinear hydraulic turbine models. These models have been extended to the single-regulation nonlinear model proposed by IEEE in 1992 [15], which means that the blade adjustment part can be added without modifying the basic model equations, and it has higher flexibility [16]- [18]. Although these studies have improved the Kaplan turbine model accuracy, the single-regulated control method with a combined relationship curve is still employed in practical application, and the transient process's adjustment problem still exists.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Control of Non-Combined Integrated Governor for Kaplan Turbine Generator Set

et al. 2021

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In this paper, a nonlinear model is established for the Kaplan turbine generator set (KTGS) with dual input governor and generator excitation to solve unsatisfactory regulation performance caused by the deviation from the combination curve during the transient process. According to the model charateristics, the constraint effect of the objective function in multi-objective feedback nonlinear control design is utilized to replace the associative relationship between the wicket gate and the blade. Then, a three-variable integrated nonlinear control strategy (TVINCS) is applied to the wicket gate, blade governor, and generator excitation. Simulation results demonstrate the precise tracking performance of hydraulic and electrical parameters controlled by TVINCS. The controller is designed to guaratee the turbine's output efficiency, and effectively coordinate the wicket gate and blade actions in the dynamic regulation process, providing a superior dynamic adjustment performance for the system under various disturbances.

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Dynamic Model of Kaplan Turbine Regulating System Suitable for Power System Analysis

Cited by 11 publications

References 18 publications

Optimization and Mechanism of the Wicket Gate Closing Law for High-Head Pumped Storage Power Stations

Optimization and Mechanism of the Wicket Gate Closing Law for High-Head Pumped Storage Power Stations

Experimental and Numerical Studies on the Influence of Blade Number in a Small Water Turbine

Nonlinear Control of Non-Combined Integrated Governor for Kaplan Turbine Generator Set

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