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Optimal scheduling and dispatch for hydroelectric generation

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Tufegdzic, N (1997) Optimal scheduling and dispatch for hydroelectric generation. PhD thesis, University of Tasmania.

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Abstract

The optimal operation of a power system has been investigated since early days
of power systems. Special attention has been given to the optimal generation
schedule, because significant savings can be achieved in this area. As
predominantly hydro systems are not common, treatment of hydro in many
cases has been connected with thermal operation and thermal fuel cost. Today
with the open electricity market becoming reality in many countries, and
decentralisation of the power industry representing the main trend, an
independent hydro generator will become a reality and the necessity for
optimisation of the predominantly or solely hydro system will increase.
The major factors which affect optimal operation of the hydro system are:
- Operation at maximum efficient point
- Target level achievement(connected with mid and long term optimal operation)
- Inflow (and load) uncertainty
- Operation at the best head
- Start up cost
The new algorithm has been developed to take into account all those factors and
produce optimal operation for a predominantly hydro system.
The new algorithm presents real time hydro scheduling which is performed through regular rescheduling and look ahead dynamic economic dispatch. The
full model is implemented including head variation and start-up costs.
Mixed Integer Linear Programming (MILP) is chosen as the solution algorithm,
because the linear programming part models the hydro network very effectively
and the integer variables can be used to control the unit start-up and shut-down
behaviour.
The new techniques are developed to accommodate implementation of the MILP
algorithm, such as power balance constraint relaxation, specific search
techniques for integer solution and more detailed connection with mid-term
optimisation.
The algorithm is implemented on the Tasmanian Hydro Electric Commission's
hydro system. It is tested off-line using historical operating plans. A
conservative estimate is that the savings will be up to six hours daily of an
operator's time plus 0.5% in annual stored energy savings. There is the
possibility for savings in the mid term optimisation by decreasing the risk of
spill through better control of short term storage levels.

Item Type: Thesis (PhD)
Copyright Holders: The Author
Copyright Information:

Copyright 1997 the author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

A number of technical journals and conferences papers connected to the thesis
are included in the Appendix.
1. Tufegdzic, N., Hyslop, P., Stadlin, W., A Unique concept for hydro economic dispatch, Proceedings of the 1993 ISEDEM Symposium on Electricity Distribution and Energy Management, Singapore, 1993
2. Tufegdzic, N., Frowd, R. J., Stadlin, W. O., A Coordinated approach for real-time short term hydro scheduling, IEEE 96 WM 169-3 PWRS, Baltimore, USA

Also included is a post print equivalent of an article published as: Tufegdzic, N. Hyslop, P., 1997, An Optimal real-time short term operation of independent hydro generator company in the open electricity market, Electric power systems research, 41(1), 5-11 doi:10.1016/S0378-7796(96)01132-7

Date Deposited: 04 Feb 2015 23:24
Last Modified: 17 Aug 2016 00:17
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