Hydropower Systems: Comparison of Mechanistic and Table Look-up Turbine Models

Splavska, Valentyna; Vytvytskyi, Liubomyr; Lie, Bernt

doi:10.3384/ecp17138368

Cited by 3 publications

(5 citation statements)

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“…In this library, different waterway components of the hydropower system are described by both mass and momentum balance, and include compressible/incompressible water or elastic/inelastic pipe walls. An overview of the mathematical models and methods used in this library is given in Vytvytskyi and Lie (2017); Splavska et al (2017).…”

Section: Model Overviewmentioning

confidence: 99%

Nonlinear observer for hydropower system

Vytvytskyi¹,

Sharma²,

Lie³

2019

MIC

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Estimation of unmeasured states plays an essential role in the design of control systems as well as for monitoring of hydropower plants. The standard Kalman filter gives the optimum state estimates for linear systems. However, this optimality is not relevant for nonlinear models and a choice between stochastic and deterministic approaches is not so obvious in this case. Thus the application of a nonlinear observer in a hydropower system is of interest here as an alternative to the widely used extended Kalman filter. This paper provides a study and design of a reduced order nonlinear observer to estimate the states of a hydropower system. Implementation of the nonlinear observer is done in OpenModelica and added to our in-house hydropower Modelica library-OpenHPL, where different models for hydropower systems are assembled. Simulations and analysis of the designed observer are done in Python using a Python API for operating OpenModelica simulations.

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Section: Model Overviewmentioning

confidence: 99%

Nonlinear observer for hydropower system

Vytvytskyi¹,

Sharma²,

Lie³

2019

MIC

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“…Our work on modelling the waterway and the Francis turbine for high head hydropower systems using the multiphysics tool OpenModelica [20], has been reported in [21][22][23]. Unit models have been developed for our in-house open-source Modelica [24] library-OpenHPL (Open Hydro Power Library is developed by the first author within his PhD study).…”

Section: Previous Workmentioning

confidence: 99%

“…The electricity produced by the generator is then transferred through power lines to consumers. More detailed description of the hydropower system has been presented in our previous work [21,22]. A typical structure of a high head hydropower plant is depicted in Figure 1 [21].…”

Section: Geometry Datamentioning

confidence: 99%

“…In OpenHPL, different waterway components of the hydropower system, e.g., reservoir, conduits, surge tank, are described by both mass and momentum balances, and could include compressible/incompressible water or elastic/inelastic pipe walls. A more detailed overview of the mathematical models and methods used in this library for the waterway components is given in [21,22]. The Pipe element in the library (see the left panel in Figure 3) represents a simple model of a circular conduit with incompressible water and inelastic pipe.…”

Section: Waterway Unitsmentioning

confidence: 99%

“…There are also available Reservoir and SurgeTank elements that represent simple models for the reservoir and surge tank, respectively. More details of these models are given in [22].…”

Section: Waterway Unitsmentioning

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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Combining measurements with models for superior information in hydropower plants

Vytvytskyi

Lie

2019

Flow Measurement and Instrumentation

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Hydropower Systems: Comparison of Mechanistic and Table Look-up Turbine Models

Cited by 3 publications

References 3 publications

Nonlinear observer for hydropower system

Nonlinear observer for hydropower system

OpenHPL for Modelling the Trollheim Hydropower Plant

Combining measurements with models for superior information in hydropower plants

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