A short-term load distribution method for a diversion-type hydropower station with multiple machines in one hole

Abstract

The invention belongs to the field of dispatching operation of hydropower stations, and relates to a short-term load distribution method of a diversion type hydropower station with multiple machines in one hole. The diversion-type hydropower station with multiple machines in one hole not only has the characteristics of large installed capacity, high operating water head, and fast tracking load, but also faces problems such as hydraulic mutual interference between units, difficult calculation of water head, and complex vibration area of ​​the unit. The present invention adopts two stages to solve this problem. Modeling and solution: In the first stage, an optimization model for starting and stopping hydropower units considering duration constraints is established, and a step-by-step optimization algorithm combined with a heuristic strategy is used to solve the optimal start-up combination; The load distribution model of this paper adopts dynamic programming to carry out the optimal distribution of load among fixed units. The invention solves the interference between hydraulic power and electric power among units in the same diversion tunnel, and provides a solid theoretical basis for solving and calculating the short-term load distribution of diversion-type hydropower stations with multiple machines in one tunnel.

Description

Technical field[0001]The present invention belongs to the field of water and electricity schedule, involving a short-term load distribution method for a multi-machine water-electric power plant.[0002]technical background[0003]Hydropower is the non-polluting green energy in my country. In the past two decades, especially in the last ten years, China's hydraulic power generation has been very rapid, and the proportion of power resources is getting bigger and larger. The research of system optimization scheduling issues is becoming more important. Therefore, under the premise of satisfying the safety of hydropower operations, the operation of the hydropower unit is scientifically reasonably arranged, in order to improve the water-energy utilization rate of hydropower to achieve greater economic benefits. Many large hydropower stations in my country use slope and gentle water to form a sharp drop in natural water surface, and build long-range water-repellent power plants to make full us...

AI Technical Summary

Problems solved by technology

The "one-hole multi-machine" hydropower station not only has the characteristics of large installed capacity, high operating head, and complex vibration area of ​​the unit, but also faces more complex problems in short-term load distribution compared with the conventional single-hole single-machine model

First of all, in the multi-machine mode of one tunnel, multiple units share the same diversion tunnel (hereinafter referred to as the tunnel), and the hydraulic connection between the units interferes with each other. When the load is distributed, it is necessary to consider the complicated distribution of power generation flow and start-up methods; secondly, when these high-head units operate When peak-shaving and frequency-regulating operations and rapid response to system load demand changes, it is necessary to consider how to avoid frequent crossing of the vibration zone; thirdly, when encountering severe hydraulic conditions or power system failures, severe fluctuations in unit load will cause drastic changes in the power generation flow in the tunnel, Cause a large amount of water energy loss, and even cause great harm to the safe operation of the power station or power grid

Therefore, the short-term load distribution of "one hole multi-machine" hydropower station has not only complex hydraulic connections such as water volume balance and flow correlation, but also complex power connections such as power constraints and power balance; Constraints, and multi-period correlation constraints such as the number of periods of unit start-up and shutdown, and vibration zone crossing must also be considered. Therefore, it is a discrete, high-dimensional, nonlinear, and non-convex mathematical programming problem. Load distribution optimization modeling and solution bring huge difficulties

At present, most of the relevant research results and literature reports in China are aimed at the short-term load distribution of single-cavity single-machine, and often use conventional mathematical methods such as mixed integer linear programming, dynamic programming and its improved algorithm, or intelligent algorithms such as genetic algorithm, ant colony algorithm, and particle swarm algorithm to solve the problem. , there is no solution considering the short-term load distribution of "one hole and multiple machines" hydropower station

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