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

A comprehensive control and self-adaptive technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of overcharging and overdischarging of energy storage, too simple control strategies, and not considering SOC self-recovery control, etc. The effect of small configuration, extended service life, and reduced frequency

Pending Publication Date: 2021-03-12
FUZHOU UNIVERSITY
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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 m

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

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Embodiment 1

[0060]In this embodiment, a small independent power system including two thermal power units and an energy storage is built in Matlab / Simulink, and its rated frequency is 50 Hz. Among them, the thermal power unit has a complete excitation and speed regulation system with a capacity of 200MVA and 150MVA respectively. The system load is a constant power load with a size of 322MW. The simulation analysis is carried out under two typical load disturbance conditions of step and continuous. Method 1 is without energy storage; method 2 is to add energy storage to participate in frequency regulation, and its control strategy is the frequency regulation stage control strategy proposed by the present invention, but does not take into account the self-recovery control of SOC; method 3 is to add energy storage to participate in frequency regulation, Its control strategy only considers the virtual droop control, the SOC self-recovery strategy in the frequency modulation dead zone and the ...

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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 ...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/32
CPCH02J3/241H02J3/32
Inventor 朱振山叶成涛温步瀛翁智敏郑海林孔昱凯吴诗雨
Owner FUZHOU UNIVERSITY
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