Control method and system for secondary frequency modulation of thermal power unit assisted by energy storage device

Abstract

The invention discloses a control method and system for assisting the secondary frequency regulation of a thermal power unit by using an energy storage device. The control system adopted by the invention comprises a power control module based on the state-of-charge of an energy storage device and a time delay compensation module based on a Smith predictor. The control system receives the secondaryfrequency modulation command from the power grid, the active power feedback of the thermal power unit, the state of charge of the energy storage device and the active power feedback of the output. According to the feedback data, the control system adopts the method based on the state of charge of the energy storage device to determine the active power output of the energy storage device. A Smithpredictor is use to compensate the time delay in the auxiliary frequency modulation system, the control system obtains command power, and the command is sent to an energy storage device through a communication device, and the power generation power of a thermal power unit is compensated by utilizing the quick response characteristic of the energy storage device; The auxiliary frequency modulationsystem comprises a control system and an energy storage device. The invention can improve the dynamic performance of the thermal power unit participating in the frequency modulation of the electric power system and obtain higher frequency modulation income.

Description

technical field [0001] The invention belongs to the field of energy storage control, and relates to the control of an energy storage device, in particular to a control method and system for secondary frequency modulation of a thermal power unit assisted by an energy storage device. Background technique [0002] In recent years, renewable energy has been connected to the power grid on a large scale, and the uncertainty in the power grid is increasing, which puts forward higher requirements for power system frequency regulation. The frequency regulation ability of traditional thermal power units is weak, and its ramp rate is generally only 2% of the rated capacity of the unit per minute. At the same time, frequent and rapid adjustments will increase the wear and tear of thermal power units and coal consumption for power generation, endangering the safety of the unit itself and the power grid. [0003] Compared with thermal power units, the energy storage device has the ability...

AI Technical Summary

Problems solved by technology

The frequency regulation ability of traditional thermal power units is weak, and its ramp rate is generally only 2% of the rated capacity of the unit per minute. At the same time, frequent and rapid adjustments will increase the wear and tear of thermal power units and the coal consumption of power generation, endangering the safety of the unit itself and the power grid

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