Variable Speed Hydropower Conversion and Control
Tor Inge Reigstad,Kjetil Uhlen +1 more
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TLDR
A variable speed hydropower (VSHP) model is developed that can aid the design of controllers that maximize the utilization of power plant for the provision of ancillary services, considering the limitations given by the hydraulic system.Abstract:
The objective of this paper is to develop and analyse a variable speed hydropower (VSHP) model that can aid the design of controllers that maximize the utilization of power plant for the provision of ancillary services, considering the limitations given by the hydraulic system. The model is tested and analysed with more or less conventional controllers to identify critical modes, adverse interactions or other limitations that must be taken into account in the future design of potentially multivariable or more advanced controllers for VSHP. Dynamic tests are performed by simulating step responses in power demand and by comparing responses of the model with the VSHP and with a conventional hydropower plant. A participation factor-based interaction analysis shows that there are no strong dynamic couplings between the hydraulic system of the VSHP and the rest of the grid. This simplifies the tuning of the control system. However, the analysis concludes that some oscillatory modes associated with the hydraulic system become significantly more excited when operating at variable speed; which is due to the larger deviation in turbine rotational speed. Extra awareness when designing the control system is therefore needed to keep the hydraulic system variables within their limits.read more
Citations
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Journal ArticleDOI
Control Methods for Standalone and Grid Connected Micro-Hydro Power Plants With Synthetic Inertia Frequency Support: A Comprehensive Review
TL;DR: This paper reviews control schemes applied in literature for the frequency, voltage, and inertia control, in both the grid-connected and standalone modes of micro-hydro power plants.
Journal ArticleDOI
Variable-Speed Hydropower Generation: System Modeling, Optimal Control, and Experimental Validation
TL;DR: A converter-fed synchronous generator system capable of variable-speed operation (VSO) in the full power range is investigated and a modified “perturb and observe” algorithm is proposed, which is easy to implement and able to track the maximum power point quickly and accurately compared with the classical method.
Journal ArticleDOI
Nonlinear model predictive control of variable speed hydropower for provision of fast frequency reserves
Tor Inge Reigstad,Kjetil Uhlen +1 more
TL;DR: The proposed non-linear model predictive controller for controlling variable speed hydropower (VSHP) plants is able to damp power oscillations in the grid, reduce water hammering in the penstock and improve the future estimation of turbine head, turbine power and turbine flow.
Posted Content
Optimized Control of Variable Speed Hydropower for Provision of Fast Frequency Reserves
Tor Inge Reigstad,Kjetil Uhlen +1 more
TL;DR: A model predictive controller was developed to coordinate the turbine controller with the virtual synchronous generator control of the power electronics converter, which allows the VSHP to provide fast frequency reserves (FFR).
Journal ArticleDOI
Variable Speed Hydropower for Provision of Fast Frequency Reserves in the Nordic Grid
Tor Inge Reigstad,Kjetil Uhlen +1 more
TL;DR: In this article, the authors demonstrate the grid support capability of variable speed hydropower (VSHP) plants by demonstrating that active power control of VSHP plants can improve both the frequency stability and the transient rotor angle stability by contributing to virtual inertia, fast frequency reserves and power oscillation damping.
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