Frequency control method and device for battery energy storage system

Abstract

The invention discloses a frequency control method and device for a battery energy storage system, and the method comprises the steps: obtaining a current frequency tracking error when a sampling period arrives; obtaining a current logic signal output according to the current frequency tracking error and a preset switching rule; and according to the current logic signal output and a pre-obtained steady-state value of the duty ratio of the DC / DC converter, adjusting the duty ratio of an output signal of the DC / DC converter so as to realize frequency control of the battery energy storage system. By adopting the embodiment of the invention, the frequency control capability, the power failure response speed and the voltage recovery capability of the battery energy storage system can be improved, and the calculated amount of frequency control of the battery energy storage system is simplified.

Description

technical field [0001] The present invention relates to the technical field of power systems, in particular to a frequency control method and device for a battery energy storage system. Background technique [0002] With the global energy shortage and climate deterioration, green energy has become the focus of attention at this stage. However, the grid integration of these intermittent and fluctuating renewable energy sources will affect the security and stability of the grid. At present, as large-scale wind power replaces traditional power sources and is connected to the grid, the inertia of the entire power system is reduced, posing a threat to the stable frequency operation of the grid. Therefore, it is urgent to improve the frequency response capability of the grid-connected power system with a high proportion of wind power. [0003] When the active power of the power supply is unbalanced with the load in the power system, the frequency fluctuation of the power system ...

AI Technical Summary

Problems solved by technology

PI controller is a kind of linear controller, which is simple and easy to implement, but it cannot give full play to the maximum output capacity of the equipment in emergency situations, and it lacks robustness to the nonlinearity and parameter uncertainty of the system

Although the nonlinear controller can fully consider the nonlinearity of the power system model and the uncertainty of parameters, its algorithm contains a large amount of calculation, which is not conducive to the digital realization of the system.

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