Day-ahead spot market clearing method for power system with water consumption rate iterative correction of hydropower station

Abstract

The invention belongs to the field of spot markets in which large-scale hydropower participates, and relates to a day-ahead spot market clearing method for power system with water consumption rate iterative correction of a hydropower station. The water consumption rate is used for replacing a complex NHQ curve to optimize power generation amount calculation, space-time hydraulic power and electricpower complex relation of the cascade power station is coupled into an SCUC / SCED model, the water consumption rate is corrected through fine water and electricity calculation iteration, and convergence is conducted to the precision within 0.01; and a complete day-ahead spot clearing solution method covering pre-event information management, declaration, SCUC / SCED and hydropower fine calculation is constructed. The method effectively solves the problem that the cascade upstream and downstream power station generating capacity are not matched when large-scale hydropower participates in day-ahead market clearing, and avoids solving difficulty brought by hydropower complex constraints to a clearing optimization model. The method has great significance in promotion and construction of electricpower spot markets in areas with high water and electricity proportions, with cascade power stations being tight in space-time coupling and upstream and downstream power stations belonging to different benefit bodies.

Description

technical field [0001] The present invention belongs to the field of day-ahead spot market of electric power system with large-scale hydropower participation, relates to a method for clearing day-ahead spot market of power system through iterative correction of water consumption rate of hydropower station, and is a method for solving the problem of high proportion of hydropower and multi-operator cascade power station participation A new method for the mismatch problem of upstream and downstream power generation of cascade power stations that occurs when the spot market is cleared and solved. Background technique [0002] The essence of the day-a-day spot market clearing of the power system is a problem of electric energy clearing calculations and backup safety-constrained unit combinations, and there are relatively mature clearing algorithms. However, for power systems containing hydropower, especially power systems with a high proportion of hydropower and a large scale of ...

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Problems solved by technology

[0003] In view of the above problems, the present invention relies on the key support project of the National Natural Science Foundation of China major plan (91547201), and proposes a method for clearing the spot goods in the power system based on the iterative correction of the water consumption rate of the hydropower station. Participate in the SCUC / SCED calculation with the unit as the bidding unit, use the water consumption rate to replace the complex NHQ curve power generation optimization calculation, couple the complex relationship between spatiotemporal hydraulic power and electric power of the cascade power station into the SCUC / SCED model, combine the clearing results of the power station through hydropower fine-tuning The water consumption rate is corrected iteratively by means of simplified calculation, which effectively solves the problem of mismatching power generation of the cascade power station upstream and downstream power stations when the spot market is cleared, and at the same time avoids the difficulty in solving the problem caused by the hydropower nonlinear constraint given the clearing optimization model

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