Power-heat decoupling system in heat-power cogeneration system and control method thereof

Abstract

The invention discloses a power-heat decoupling system in a heat-power cogeneration system. The power-heat decoupling system comprises a gas generator, a heat-power set, a wind power generation device, a heat storage device, a power-heat conversion device, a power load and a heat load, wherein the gas generator is connected with the power load; the wind power generation device and the heat-power set are connected with the heat storage device through the power-heat conversion device; the heat-power set is connected to the power load, the heat load and the heat storage device respectively; the heat storage device is connected to the heat load. A method comprises the following steps: determining demanded quantity of the heat load and the power load, the purchased wind power unit price, fuel unit price, power selling price and heat selling price; determining power quantity and heat quantity generated by unit fuel and heat generated by unit power quantity through power-heat conversion; solving power of the heat-power set, the heat storage device and the gas generator, interaction power of the wind power generation device and the heat storage device, and interaction power of the heat-power set and the heat storage device; and regulating the heat load and the power load via the heat storage device and the gas generator if the heat load and the power load have fluctuation. Through the power-heat decoupling system, an operation method of ordering power by heat is decoupled; and the problem of the wind power consumption is solved.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric decoupling regulation of cogeneration, and mainly relates to an electrothermal decoupling system in a cogeneration system and a control method thereof. Background technique [0002] The structure of power generation units in northern my country is relatively simple, dominated by thermal power units, of which thermal power units account for a considerable proportion and are also used as the main heat source for heat supply. The old thermal power units in Northeast China are facing transformation due to insufficient peak-shaving capacity and other reasons. The thermal power unit’s own operation mode of “setting power by heat” gives priority to the demand of thermal loads, so that the power supplied to the electrical loads will be too little or Too much, the thermoelectric coupling relationship seriously restricts the peak-shaving capability of the thermoelectric unit, causing fluctuations in ...

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Problems solved by technology

The power grid will unconditionally accept the electric energy generated by the thermoelectric unit, which may cause an imbalance between the supply and demand of electric energy

Especially at night in winter, when the demand for electric load is small and the demand for heat load is high, the excessive electric energy received by the grid will fluctuate the grid, affect the stability of the grid, and lead to the inability to fully utilize the electric energy, resulting in energy waste and uneconomical operation of thermal power plants

[0005] At the same time, a considerable part of my country's wind power industry is concentrated in the northern region, and the amount of wind power connected to the grid is increasing year by year. Wasted energy will have a great impact on changes in the future energy pattern

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