Power system secondary frequency modulation control method giving consideration to large-scale battery energy storage charge state and energy storage station distributed cooperative control system

Abstract

The invention discloses a power system secondary frequency modulation control method giving consideration to a large-scale battery energy storage charge state and an energy storage station distributed cooperative control system, and the method comprises the steps: calculating a regional control deviation, and obtaining the charge state and a horizontal interval of a large-scale battery energy storage station; according to the region control deviation, determining a region adjustment power demand and an adjustment interval in which the region adjustment power demand is located; according to a preset power distribution strategy, respectively obtaining secondary frequency modulation power data corresponding to a thermal power generating unit and an energy storage station according to the charge state level interval of the large-scale battery energy storage station and the adjustment interval of the regional adjustment power requirement, and issuing the secondary frequency modulation power data to the thermal power generating unit and the energy storage station; and enabling the energy storage station to perform distributed cooperative control according to the received secondary frequency modulation power data, so that the total power of the energy storage station tracks the secondary frequency modulation power data, and the charge states and the charge and discharge power of all energy storage units are consistent. The secondary frequency modulation target of the power system can be achieved, the state of charge of the energy storage power station can be ensured to be within the set operation interval, and the capacity of the energy storage power station for continuously participating in the secondary frequency modulation is improved.

Description

technical field [0001] The invention relates to the technical field of secondary frequency regulation of electric power systems, in particular to a control method for secondary frequency regulation of electric power systems and a distributed collaborative control system for energy storage stations that take into account the state of charge of large-scale battery energy storage. Background technique [0002] The integration of large-scale renewable energy into the power grid greatly reduces the system inertia and anti-interference ability, and brings great challenges to power system frequency regulation. Traditional frequency regulation resources have their own limitations when dealing with fast-changing and large-fluctuation loads, which is not conducive to the further improvement of power system frequency regulation quality. Therefore, it is urgent to coordinate and configure frequency regulation resources with flexible control of speed blocks. With the continuous developme...

AI Technical Summary

Problems solved by technology

However, the ability of the battery energy storage system to participate in system frequency regulation is limited by the battery capacity and the state of charge of the battery. Continuous discharge (or charge) for a long time will cause the battery to deplete (or fully store), and the battery energy storage system is depleted or When fully charged, only one-way frequency modulation can be performed, which greatly weakens the ability to participate in frequency modulation

In addition, the charging power and state of charge of each energy storage unit in the energy storage station must be effectively managed, otherwise it will greatly reduce the utilization rate of the frequency modulation capacity of the energy storage system, and even endanger the healthy operation of the energy storage system

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