Energy storage primary frequency modulation comprehensive control method considering SOC adaptive recovery

Abstract

The invention relates to an energy storage primary frequency modulation comprehensive control method considering SOC adaptive recovery, and the method takes a power grid frequency modulation dead zoneas a boundary, and enables the process of energy storage participating in frequency modulation to be divided into a frequency modulation stage and an SOC self-recovery stage. In the frequency modulation stage, a comprehensive control strategy considering virtual droop control, virtual inertia control and virtual negative inertia control is adopted, so that the effect that energy storage participates in primary frequency modulation of the power system is exerted to the maximum extent. In the SOC self-recovery stage, the recovery benchmark of the SOC is set to be an interval of (0.45-0.55), sothat the frequency of starting SOC self-recovery by energy storage can be reduced, and the potential of energy storage participating in next frequency modulation can be ensured. An SOC-based self-adaptive control rule is adopted for power recovery, so that the problems of over-charging and over-discharging can be effectively prevented.

Description

technical field [0001] The invention relates to the field of power system control, in particular to an energy storage primary frequency modulation comprehensive control method considering SOC self-adaptive restoration. Background technique [0002] With the improvement of environmental protection awareness and the depletion of fossil fuels, large-scale renewable energy sources, such as wind power and photovoltaics, are being widely used in power generation. However, the volatility and uncertainty of renewable energy will seriously affect the power supply security of the power system. Moreover, the replacement of traditional units with a high proportion of renewable energy will reduce the inertia of the system and affect the primary frequency regulation capability of the power system. Therefore, under such pressure, it is urgent to find new means of frequency modulation to make up for the lack of the next frequency modulation capability of the traditional method. In recent ...

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Problems solved by technology

[0003] At present, the research on energy storage participating in the primary frequency regulation control strategy of the power system mainly has the following problems: on the one hand, the management of SOC is mostly concentrated in the frequency regulation stage, and the SOC self-recovery control in the frequency regulation dead zone is not considered, which may cause serious problems. Causes overcharging and overdischarging of energy storage

On the other hand, when SOC self-recovery is considered, the control strategy in the frequency regulation stage is too simple, for example, only the role of virtual droop control is considered, and the maximum role of energy storage in frequency regulation cannot be fully utilized.

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