Secondary frequency modulation control method of power system considering large-scale energy storage state of charge

Abstract

The invention discloses a power system secondary frequency modulation control method and an energy storage station distributed collaborative control system that take into account the state of charge of large-scale battery energy storage. The method includes: calculating regional control deviations and obtaining the charge of large-scale battery energy storage stations. state and its level interval; determine the regional adjustment power demand and the adjustment interval according to the regional control deviation; according to the state-of-charge level interval of the large-scale battery energy storage station and the adjustment interval of the regional adjustment power demand, according to the preset power The distribution strategy obtains the secondary frequency modulation power data corresponding to the thermal power units and energy storage stations respectively, and sends it to the thermal power units and energy storage stations. The energy storage station performs distributed collaborative control based on the received secondary frequency modulation power data, so that the energy storage station The total power tracks the secondary frequency modulation power data, and the state of charge and charge and discharge power of all energy storage units are consistent. While being able to achieve the target of secondary frequency regulation of the power system, the present invention can ensure that the state of charge of the energy storage power station is within the set operating range, thereby improving the ability of the energy storage power station to continuously participate in secondary frequency regulation.

Description

Technical field [0001] The present invention relates to the technical field of secondary frequency modulation of power systems, in particular to a power system secondary frequency modulation control method and an energy storage station distributed collaborative control system 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 has greatly reduced the system inertia and anti-interference capabilities, posing great challenges to power system frequency regulation. Traditional frequency regulation resources have their own limitations when dealing with loads that change rapidly and fluctuate greatly, which is not conducive to further improvement of the frequency regulation quality of the power system. Therefore, there is an urgent need to coordinate the configuration of speed regulation blocks and control flexible frequency regulation resources. With the...

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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