Energy storage-unit coordinated frequency modulation control method for reducing frequency modulation action of thermal power unit

Abstract

The invention discloses an energy storage-unit coordinated frequency modulation control method for reducing frequency modulation actions of a thermal power generating unit, and belongs to the technical field of thermal power generating unit control. According to the method, the thermal power generating unit and an energy storage system are used as a whole for coordinated control, different control strategies are generated according to different AGC instructions, and output of the thermal power generating unit and output of the energy storage system are controlled respectively; while the comprehensive frequency modulation index is improved, the frequency modulation action frequency and frequency modulation action amplitude of the thermal power generating unit are reduced, the operation stability and safety of the unit are improved, the service life of the thermal power generating unit is prolonged, and optimal control is achieved.

Description

technical field [0001] The present invention relates to the technical field of thermal power unit control, and more specifically, relates to an energy storage-unit coordinated frequency modulation control method that reduces frequency modulation actions of thermal power units. Background technique [0002] In recent years, with the continuous integration of new energy generation methods such as wind power and photovoltaic power generation, the operation and regulation of the power grid system has become more difficult, and the demand for frequency regulation resources in the power grid has also increased. At the same time, the proportion of traditional thermal power units has decreased. The available frequency regulation resources of the power grid are reduced, and the problem of insufficient frequency regulation capacity is highlighted. With the further deepening of power market reform, the power auxiliary service market has become a hot spot and focus of reform. Electroche...

AI Technical Summary

Problems solved by technology

The known method does not reduce the number of frequency modulation actions and the frequency modulation action range of the thermal power unit when the AGC command is changed, and the thermal power unit still operates according to the original logic, especially when the AGC command is in the ACE mode, the AGC command changes frequently, often after the rising command, And immediately lower the command to this turn-back state. Under this turn-back command state, the thermal power unit will easily cause the adjustment of the coordinated control system to be unstable, so that the change range and frequency of the boiler-side fuel quantity command and the turbine-side control valve command will follow. Increase, the fluctuation of fuel quantity will lead to combustion disturbance, resulting in fluctuations in furnace pressure, NOx emission, main steam temperature, etc., reducing the operating safety and economic environmental protection of the unit, and may even lead to boiler overpressure in severe cases

The command change of the regulating valve on the steam turbine side will lead to a large change in the steam intake of the steam turbine, reduce the life of the equipment, and easily cause shaft vibration and shoe vibration of the turbine

Images