Power-type energy storage frequency modulation responsibility dividing method based on secondary planning

Abstract

The invention discloses a power-type energy storage frequency modulation responsibility dividing method based on secondary planning, and the method comprises the steps: optimizing the output power ofa frequency modulation power supply through the secondary planning according to the basic information of the frequency modulation power supply and the real-time state information of the frequency modulation power supply, and achieving the precise tracking of a regional error signal. Meanwhile, when a tracking failure is caused by objective factors (insufficient frequency modulation power), a linear planning method is employed for achieving the minimization of a tracking error. The method makes the most of the quick reaction capability of an energy storage device, achieves the precise trackingof a secondary frequency modulation signal of a system to the maximum degree, and improves the frequency modulation capability of a power grid. In addition, the method also can enable the charge stateof the battery energy storage to remain nearby a set value, guarantees the remaining charging and discharging capacity, and prolongs the service life. Meanwhile, the method effectively reduces the equipment loss, caused by the frequent climbing, of a conventional motor in a frequency modulation process.

Description

technical field [0001] The invention relates to the technical field of power grid secondary frequency control, in particular to a power type energy storage frequency regulation responsibility division method based on secondary planning. Background technique [0002] With the global energy shortage and the deterioration of the climate environment, the development of new energy has become the focus of attention of all countries at this stage. New energy power generation has volatility and uncertainty, and this type of intermittent power supply does not have inertia. After large-scale grid connection, the inertia of the grid will be reduced, which will put pressure on the frequency regulation of the grid. The frequency regulation capacity of the traditional power supply has been difficult to meet the frequency regulation requirements of the power grid, and the constraints of the response power amplitude and polarity change speed must be considered in the unit control of the tra...

AI Technical Summary

Problems solved by technology

[0004] At present, the secondary frequency regulation of the system with the participation of energy storage in the power system is mainly based on a fixed responsibility division method, which cannot meet the real-time changes in the charge state under the penetration of renewable energy.

In addition, some methods do not give full play to the ability of battery energy storage to quickly respond to frequency modulation needs. Similarly, some methods ignore the change of battery energy storage charge state, and cannot guarantee the remaining charge and discharge capacity of battery energy storage.

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