Power grid frequency control device and method based on battery energy storage system

Abstract

The invention discloses a power grid frequency control device and method based on a battery energy storage system. The device includes a battery energy storage system and a frequency control device; The size of the capacity SOC automatically switches the power control mode of the battery energy storage system, so as to stabilize the grid frequency through the switching of the operation mode of the battery energy storage system. On the one hand, the present invention can effectively keep the SOC of the remaining capacity of the battery within a reasonable range, reduce the number of battery cycles, improve the availability and safety of the energy storage system, and promote the economic benefits of the frequency modulation mode in the entire life cycle of the energy storage system. On the other hand, The real-time adjustment of the inverter output power based on the real-time grid frequency is conducive to stabilizing the grid frequency, avoiding the fluctuation of the grid frequency due to the large deviation between the actual output power of the inverter and the expected output power, and making the grid run stably.

Description

technical field [0001] The invention relates to a power grid frequency control device and method based on a battery energy storage system, and belongs to the technical field of power system frequency modulation. Background technique [0002] With the continuous integration of large-scale wind power and photovoltaic and other intermittent new energy sources into the power grid and the continuous development of decentralized distributed power systems, the structure and characteristics of the power grid have undergone significant changes compared with before, and the stability and security of the power grid are facing challenges. new challenge. [0003] The frequency of the power grid is an important control parameter for the operation of the power system. The rated frequency in my country is 50Hz, which reflects the balance between the active power at the generator end and the load at the load end. When the two are consistent, the frequency of the grid is kept stable at Rated ...

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Problems solved by technology

[0006] At present, power control methods for frequency modulation applications of battery energy storage systems include virtual inertia control, virtual droop control, and adaptive control, etc., which have disadvantages such as complex control structures and practical limitations, and are not suitable for power grid frequency modulation applications of battery energy storage systems. The balance between battery capacity (SOC) control, cycle time, energy utilization and frequency modulation performance is lacking

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