A Day-Ahead Unit Combination Optimization Method for Thermal Power Systems in Thermal Power Plants Operating in Multiple States

Abstract

The invention discloses an optimization method of the day-ahead unit commitment of a thermal power system of a thermal power plant capable of operating under multiple states. The optimization method comprises the following steps: firstly, predicting the total power generation load of the system and the heat supply load of each thermal power plant on the next day; then, taking the minimum total power generation coal consumption of thermal power system on the next day as a target, and taking a situation that power supply and thermal energy supply are satisfied as a condition to establish an optimization model of the thermal power system unit commitment by simultaneously meeting constraints including the reserve requirements of the thermal power system, the electrothermal coupling characteristics of an extraction steam turbine of the thermal power plant and the thermal characteristics of a thermal storage tank; and finally, using an optimization algorithm to calculate to obtain a startup-shutdown plan of each thermal power unit, a power generation and steam extraction plan of a steam turbine of a heat supply unit and a thermal charging and discharging plan of the thermal storage tank in the thermal power plant on the next day so as to guarantee the economic operation of the thermal power system.

Description

technical field [0001] The invention relates to the technical field of power system dispatching operation, in particular to a method for optimizing unit combination of a thermal power system of a multi-state operating thermal power plant. Background technique [0002] At present, my country's power grid is under great pressure for peak regulation, and the operation mode of "heating to determine electricity" of heating units is one of the main reasons for the difficulty in peak regulation. The heat-supply units dispatched by my country's power grid are basically large-scale steam-extraction heat-supply units, and large-scale steam-extraction thermal power plants are equipped with heat storage tanks, such as figure 1 As shown, it can effectively decouple the operation constraints of "heat-based power generation", improve the flexibility of generating unit peak-shaving operation, and relieve the system's peak-shaving pressure. [0003] When the power system adopts the centrali...

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Problems solved by technology

[0034] When thermal power plants are equipped with thermal storage tanks, the above traditional unit combination model is difficult to apply because it does not consider the heat supply of thermal power units and thermal storage tanks.

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