Cooperative control method and system of battery energy storage power source participating in secondary frequency modulation of power grid

Abstract

The invention provides a cooperative control method and system of a battery energy storage power source participating in secondary frequency modulation of a power grid. The cooperative control method comprises the steps of: mounting the battery energy storage power source in a regional power grid needing the cooperation; obtaining an ACE (Area Control Error) signal from an electric grid control center by a cooperative control module; participating in the secondary frequency modulation of the power grid by the battery energy storage power source, and then dividing a typical application scene to determine the chance and participating degree of participation in the frequency modulation; converting a theoretical frequency modulation command into a practical frequency modulation command, then realizing charge / discharge control of the battery energy storage power source through an energy conversion system, and accordingly helping a traditional frequency modulation power source to finish a secondary frequency modulation process. The transient and steady performances of the secondary frequency modulation of the power grid are improved obviously, the frequent start of the traditional frequency modulation machine set is reduced, and balance between supply and demand of the power grid is maintained rapidly.

Description

technical field [0001] The invention relates to a coordinated control method and system for a battery energy storage power supply participating in secondary frequency modulation of a power grid. Background technique [0002] In the secondary frequency regulation of the power grid, by changing the position of the differential regulation characteristic curve of the generator set, the frequency can be adjusted without difference, which is generally used to adjust the load fluctuation of minute level and longer period. [0003] (1) Tie-line load frequency bias control (Tie-line load frequency Bias Control, TBC) control mode is generally adopted for the interconnected grid, that is, the frequency bias and the tie-line net exchange power bias are linearly superimposed to reflect the regional supply and demand imbalance, thus forming ACE signal with secondary frequency modulation. The ACE signals in each area generally go through filtering and dead zone judgment, and then the cont...

AI Technical Summary

Problems solved by technology

At present, the frequency modulation capacity of hydropower units participating in secondary frequency modulation is easily restricted by regions and seasons; due to technical limitations such as energy conversion process and slow climbing rate of thermal power units, the frequency modulation process shows long response time lag, adjustment process delay, Reverse and deviation (overshoot and undershoot) and other phenomena, and the frequency regulation service provided by the unit not only aggravates the wear and tear of its equipment, but also increases fuel consumption, operating costs and waste emissions, etc.

With the large-scale grid-connection of high-penetration new energy, the problem of insufficient existing frequency regulation capacity has become increasingly prominent, and new frequency regulation methods are urgently needed

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