Fire-storage AGC frequency modulation control method by considering flexible load characteristics

Abstract

The invention discloses a fire-storage AGC frequency modulation control method by considering flexible load characteristics. The method is characterized in that partition control is carried out on theoperation of each frequency modulation resource, the operation constraint of a battery energy storage system and the centralized control constraint of a flexible load are designed from the perspective of source-load interaction, and the real-time condition of the system is accurately and reasonably adjusted based on frequency deviation partition; the power supply side smoothes the output of the unit by utilizing the rapid adjustment characteristic of the battery energy storage system, and restrains the charging and discharging depth by adopting a linear regression function; the load side relieves the frequency regulation pressure by utilizing the flexible scheduling characteristic of the flexible load, and depicts the constraint of the controllable output by adopting centralized control;partitioning is carried out according to different degrees of frequency deviation, and different regulation and control means are adopted in different areas to accurately respond to different states of the system. The frequency modulation performance of the system can be improved, the energy storage output condition is optimized, and the energy storage life loss is reduced.

Description

technical field [0001] The invention relates to the field of secondary frequency regulation of energy storage auxiliary thermal power units, and is a fire-storage AGC frequency regulation control method considering flexible load characteristics. Background technique [0002] With the integration of large-scale renewable energy into the grid, its volatility and power decoupling characteristics make it impossible for renewable energy units to provide sufficient frequency regulation reserve capacity. Due to the long start-up time of traditional thermal power units and the slow climbing speed of the units, they cannot quickly respond to system frequency regulation. Therefore, it is necessary to find an adjustment method that can solve the problem of rapid frequency change of the power system after large-scale renewable energy is connected to the grid to adjust the frequency of the system. In the previous studies, when the energy storage auxiliary thermal power unit was only use...

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Problems solved by technology

In the previous studies, when the energy storage auxiliary thermal power unit was only used for frequency regulation, because the adjustable power of the energy storage system in different states of charge is different, the acceptable power is small when the state of charge value is extremely large, and the power can be accommodated when the state of charge value is In extremely small cases, the released power is small, so that the energy storage system may be insufficient in the case of the extreme value of the state of charge, which limits the system frequency recovery

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