Hydraulic damping mechanism of low frequency oscillations in power systems: Quantitative analysis using a nonlinear model of hydropower plants

Yang, Weijia; Norrlund, Per; Bladh, Johan; Yang, Jiandong; Lundin, Urban

doi:10.1016/j.apenergy.2018.01.002

Cited by 71 publications

(34 citation statements)

References 51 publications

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“…Some work on models for these units of the hydropower systems has already been presented in the literature [1][2][3][4]. Applications of hydropower models have also been published in [5][6][7]. Various examples of software tools for hydropower modelling also exist, and a basic overview of some of them has been given in [8].…”

Section: Previous Workmentioning

confidence: 99%

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OpenHPL for Modelling the Trollheim Hydropower Plant

Vytvytskyi

Lie

2019

Energies

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An increase of tightly integrated, renewable energy sources with highly varying production leads to a greater need for flexible hydropower plants to “balance” the intermittent production from these sources. From a systems perspective, the intermittency aspect constitutes a disturbance, while the tight integration leads to a multivariable systems, both of which causes increased challenges for good control. This instigates the need for a model based analysis and synthesis tool which can describe dynamic phenomena, supports multiphysics problems, and allows for immediate use in advanced control analysis and design. Previously, an open source Hydro Power Library (OpenHPL) have been developed within the multiphysics Modelica eco-system which satisfies the above requirements: OpenHPL contains a set of model units relevant for hydropower systems, as well as examples of tools for analysis of these models for control purposes. Thus far, OpenHPL has been validated by comparison against other simulation tools. However, a real test of OpenHPL is to use it to describe a real hydropower plant using minimal plant information, to tune model parameters against experimental data, and to validate the model. As a case study, experimental data from the Trollheim hydropower plant in Norway have been made available, and used to test OpenHPL. By flow sheeting a hydropower model in OpenModelica using OpenHPL, the model can be simulated from within a script language (Python via the OMPython API, Julia via the OMJulia API) and further analyzed using analysis tools in the script language. Based on default model parameter suggestions from OpenHPL, least squares model fitting was carried out in Python, and the model was validated with good model fit. Important parts of the modelling phase were the development of a new friction model for the Francis turbine, and iterations on the description of the turbine outlet geometry. The results are complemented with a discussion of possible uses of the model.

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Section: Previous Workmentioning

confidence: 99%

“…Another tool, TOPSYS, a combined effort of Wuhan University and Uppsala University, is based on Visual C++ and provides models for various components of hydropower plants [6,12]. This software allows for simulation of elastic conduits with compressible water described by PDEs.…”

Section: Previous Workmentioning

confidence: 99%

OpenHPL for Modelling the Trollheim Hydropower Plant

Vytvytskyi

Lie

2019

Energies

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“…The non-linear dynamic phenomena are often found in the hydroturbine governing system (HTGS) because of the complex interactions among the hydraulic, mechanical and electrical components [1][2][3]. The HTGS is the key control component used to regulate this non-linear behaviour and maintain changes in the frequency of the generator within the required time interval [4]. Bifurcation behaviours in particular can result in the failure of the HTGS linked with the power grid through transmission networks.…”

Section: Introductionmentioning

confidence: 99%

Local bifurcation and continuation of a non‐linear hydro‐turbine governing system in a single‐machine infinite‐bus power system

Zhang

Chen

et al. 2020

IET Generation, Transmission & Distribution

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“…Recently, hydropower represents an indispensable role in the power industry due to the stability, reliability and economy efficiency, compared with the developing intermittent renewable energy like solar and wind, as well as the traditional high emission coal-fired thermal power [1][2][3]. In this regard, the hydraulic turbine governing system (HTGS), as the key structure of any hydropower plant, is finely studied and designed to guarantee the operation's safety and proper response [4].…”

Section: Introductionmentioning

confidence: 99%

Feedback Linearization and Reaching Law Based Sliding Mode Control Design for Nonlinear Hydraulic Turbine Governing System

Guo

Jiang

2019

Energies

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Hydropower as renewable energy has continually expanded at a relatively high rate in the last decade. This expansion calls for more accurate scheme design in hydraulic turbine governing system (HTGS) to ensure its high efficiency. Sliding mode control (SMC) as a robust control method which is insensitive to system uncertainties and disturbances raises interest in the application in HTGS. However, the feature of highly coupled state variables reflects the nonlinear essence of HTGS and SMC studies on the related mathematical model under certain fluctuations are not satisfied. In this regard, a novel SMC design with proportional-integral-derivative manifold is firstly applied to a nonlinear HTGS with a complex conduit system. In dealing with certain fluctuations in speed and load around the rated working condition, the proposed SMC is capable of driving the system to the desired state with smooth and light responses in aspects of the key state variables. The exponential reaching law and introduced boundary layer fasten the speed of converging time and suppress chattering. A necessary integral of sliding parameter added to manifold successfully reduces the latency caused by the anti-regulation feature of HTGS. Three operating scenarios are simulated compared with the PSO-PID method, and results imply that the proposed SMC method equips with accurate trajectory tracking ability and smooth responses. Finally, the strong robustness against system uncertainties is tested.

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Hydraulic damping mechanism of low frequency oscillations in power systems: Quantitative analysis using a nonlinear model of hydropower plants

Cited by 71 publications

References 51 publications

OpenHPL for Modelling the Trollheim Hydropower Plant

OpenHPL for Modelling the Trollheim Hydropower Plant

Local bifurcation and continuation of a non‐linear hydro‐turbine governing system in a single‐machine infinite‐bus power system

Feedback Linearization and Reaching Law Based Sliding Mode Control Design for Nonlinear Hydraulic Turbine Governing System

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