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Modelling of firm offer from combined wind and hydro generations


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This paper analyses the impact of a firm combined offer by wind and small hydro generators located in the river chain, with a view to address the intermittency of wind generators. Both generations are dispatchable and cleared against their offer prices. They offer a firm, hourly-schedule (WH schedule) for 24 hours ahead of real-time operation to an auction based locational marginal price (LMP) market with other generators offering to meet the system loads. The model network consists of other generators and loads at different buses. The scheduled power is taken off at a predetermined bus, as a load at the bus. This schedule must be met by the wind and hydro combined generations. If necessary, a notional thermal generation is available at a considerable higher price to meet the schedule, at the offtake point.
The objective is to minimise the total supply cost for 24 hours and examine LMPs and constraint-on costs while respecting the given WH schedule, nodal power balance constraint, generation limits, branch flow and other limits. Discussion is based on New Zealand (NZ) Electricity Market rules, where generators are self-committed into the market. Three scenarios are studied and the results presented.

Item Type: Paper presented at a conference, workshop, or other event which was not published in the proceedings
Uncontrolled Keywords: Index Terms—Constraint-on payment, Dual Problem, Electricity market, Firm offer, Hydro generation, Optimisation.
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Schools > Centre for Engineering and Industrial Design
Depositing User: Sarla Kumari
Date Deposited: 06 May 2020 23:21
Last Modified: 21 Jul 2023 08:48

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