Variable Speed Hydropower Conversion and Control

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 a...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on energy conversion 2020-03, Vol.35 (1), p.386-393
Main Authors: Reigstad, Tor Inge, Uhlen, Kjetil
Format: Article
Language:English
Subjects:
AC-AC power conversion
Ancillary services
Computer simulation
Control systems design
Controllers
Couplings
Dynamic tests
eigenvalues and eigenfunctions
Electric power generation
Frequency control
Hydraulic equipment
Hydraulic systems
hydraulic turbines
Hydraulics
Hydroelectric plants
Hydroelectric power
Hydroelectric power generation
Mathematical model
Model testing
Multivariable control
Phase locked loops
power generation control
Power system dynamics
power system modeling
power system simulation
stability
Turbines
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2019.2943233