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

Abstract

The invention discloses a secondary frequency regulation control method for a power system and a distributed coordinated control system for an energy storage station that take into account the state of charge of large-scale battery energy storage. state and its level interval; determine the regional adjustment power demand and its adjustment interval according to the regional control deviation; The distribution strategy obtains the secondary frequency modulation power data corresponding to the thermal power unit and the energy storage station respectively, and sends it to the thermal power unit and the energy storage station. The energy storage station performs distributed coordinated control according to the received secondary frequency modulation power data, so that the energy storage station The total power tracks the secondary frequency modulation power data, and all the energy storage units have the same state of charge and the same charging and discharging power. The invention can ensure the state of charge of the energy storage power station in the set operating range while achieving the target of secondary frequency regulation of the power system, and improve the ability of the energy storage power station to continuously participate in the secondary frequency regulation.

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 coordinated 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 inertia and anti-interference ability of the system, and brings great challenges to the frequency modulation of the power system. Traditional frequency modulation resources have their own limitations in coping with loads with fast changing speed and large fluctuation range, which are not conducive to further improvement of the frequency modulation quality of power systems. Therefore, it is urgent to coordinate the configuration of adjustment speed blocks and control flexible frequency mod...

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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