A unit commitment method for deep peak load regulation of thermal power units under the condition of wind power grid connection

Abstract

The invention relates to the technical field of wind power dissipation, in particular to a unit combination method considering deep peak load regulation of a thermal power unit under the condition ofgrid connection of wind power, in particular to a method for improving peak load regulation capacity of the thermal power unit under the condition of grid connection of wind power. Including: unit commitment algorithm; Objective function of unit commitment; Constraints of unit commitment; Solution of unit commitment; Operation Flow of Unit Commitment. Under the condition of large-scale wind powergrid connection, the invention considers that a certain reserve is reserved for the wind farm to balance the change of the wind power output. When the load is low, the conventional power plant unit has been adjusted to a lower output, if the wind farm output increases significantly at this time, the acceptance of wind power will be limited, resulting in wind power discarding limit. Genetic algorithm is used to find the global optimal solution, and the economy of deep peak shaving scheme is analyzed under the condition of large-scale wind power grid. Solve the problem of not abandoning the windabsorption, save the thermal power unit power generation cost, so that 'deep regulation absorption' is feasible.

Description

Technical field [0001] The invention relates to the technical field of wind power absorption, in particular to a unit combination method considering the deep peak shaving of thermal power units under the condition of wind power grid connection, and specifically relates to a method for improving the peak shaving capacity of thermal power units under the condition of wind power grid connection. Background technique [0002] After large-scale wind power is connected to the grid for power generation, the power system's peak shaving capacity has been severely weakened. In addition, wind power output has the characteristics of intermittency, volatility, anti-peak shaving characteristics, and low prediction accuracy and capacity credibility, which greatly increases the peak-valley difference of the equivalent load of the system and increases the difficulty of system peak shaving. With the continuous adjustment of China's industrial structure, China's electricity consumption structure is...

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Problems solved by technology

The problem that may arise in the traditional unit optimization combination is that although the total consumption is the smallest or the economic benefit is the largest, it fails to consider that when the load is low, the conventional power plant unit has been adjusted to a lower output. If the output of the wind farm increases significantly at this time, then Whether conventional units can further contribute to allow wind power to carry the load determines the ability of the grid to accept wind power, that is to say, the peak-shaving capability of conventional units at low-valley loads is the key condition that limits the ability of the provincial grid to accept wind power

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