Energy storage battery-based control method and system for primary frequency regulation of power grid

Abstract

The present application relates to an energy storage battery-based control method and system for primary frequency regulation of a power grid. The method comprises the following steps: in step S1, when power disturbance occurs in an electric power system, whether to switch on the energy storage battery to participate in the primary frequency regulation of the power grid according to frequency deviation of the electric power system; in step S2, when the frequency deviation of the electric power system falls within an allowed range of power grid frequency deviation, a control mode of the energystorage battery participating in the primary frequency regulation of the power grid is determined based on magnitude of the frequency deviation of the electric power system and a state of charge of the energy storage battery; in step S3, if the frequency deviation of the electric power system exceeds the allowed range of the frequency deviation of the power grid, virtual droop control and virtualinertia control work together to participate in the primary frequency regulation of the power grid. The method and system disclosed in the invention can help solve a problem that secondary fall of system frequency occurs and the energy storage battery is short in service life during the primary frequency regulation of the power grid via energy storage battery control technologies based on combination of the virtual droop control and the virtual inertia control.

Description

Technical field [0001] This application belongs to the technical field of power grid primary frequency modulation, and in particular relates to a power grid primary frequency modulation control method and system based on energy storage batteries. Background technique [0002] With the large-scale grid integration of clean energy power generation represented by wind and solar energy, the system balance is severely threatened. Due to the volatility and randomness of wind power and solar power generation, power fluctuations and other problems have caused the system to be between effective output and load. Dynamic imbalance leads to system frequency deviation, which brings severe challenges to the safety and stability of the system. [0003] The response speed of traditional generator sets is slow, and the adjustment accuracy is low, which cannot meet the primary frequency regulation requirements of the grid under the background of new energy generation grid connection. With the devel...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in order to solve the primary frequency regulation of the power grid based on the energy storage battery control technology based on the combination of virtual inertia control and virtual droop control in the prior art In the process, the system frequency drops twice and the life of the energy storage battery is short, thus providing a power grid primary frequency modulation control method and system based on the energy storage battery SOC feedback

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