Control method for assisting primary frequency modulation of thermal power generating unit by flywheel energy storage

Abstract

The invention discloses a control method for assisting primary frequency modulation of a thermal power generating unit by flywheel energy storage, and relates to the technical field of thermal power generating unit control. By means of the load characteristic of flywheel energy storage, when frequency modulation load reduction is needed in power grid frequency modulation, a motor in a flywheel energy storage system serves as a motor to accelerate a flywheel by means of the quick charging function of the flywheel energy storage when frequency modulation load reduction is needed; electric energy is converted into mechanical energy, so that the unit load is reduced; when power grid frequency modulation needs to increase load, the motor in the flywheel energy storage system is used as a generator to convert mechanical energy of a flywheel into electric energy to supply power to the outside by utilizing a quick discharge function of flywheel energy storage, so that unit load is increased; and therefore, the primary frequency modulation performance of the unit can directly and automatically adjust the steam turbine control valve to complete the primary frequency modulation response without depending on the self-adjusting system of the steam turbine, the service life of steam turbine generator unit equipment is prolonged, and the economical efficiency of a thermal generator unit is enhanced.

Description

Technical field [0001] The present invention relates to the technical field of thermal power unit control, and more specifically, to a control method for flywheel energy storage to assist primary frequency modulation of thermal power units. Background technique [0002] The primary frequency regulation function of thermal power units plays an important role in maintaining the stability of the power grid. With the construction of new power systems based on new energy sources, the power grid has also put forward higher requirements for the primary frequency regulation performance of thermal power units. Traditional primary frequency modulation of thermal power units usually adjusts the opening of the turbine valve and uses the heat storage of the boiler to quickly respond to changes in the grid frequency. This frequency modulation method will cause the unit's turbine valve and turbine speed to change when the grid frequency changes frequently. Rapid changes seriously affect th...

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Problems solved by technology

Among them, flywheel energy storage has the advantages of fast response, high efficiency, long service life and environmental friendliness, and is very suitable for adjusting primary frequency regulation caused by rapid load disturbance. Therefore, flywheel energy storage is an emerging auxiliary thermal power unit frequency regulation For example, the primary frequency modulation control device for thermal power units based on flywheel energy storage, patent document number CN110571833B, but there is no mature solution for the control method of flywheel energy storage auxiliary thermal power unit primary frequency modulation

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