Energy storage primary frequency modulation control method based on dynamic droop coefficient and SOC recovery base point

Abstract

The invention discloses an energy storage primary frequency modulation control method based on a dynamic droop coefficient and an SOC recovery base point. The method is characterized by dividing an energy storage frequency modulation process into a frequency modulation stage and an SOC recovery stage by taking a power grid frequency modulation dead zone as a segmentation boundary; at the frequencymodulation stage, using the SOC and the maximum frequency deviation as controlled variables to adaptively adjust the energy storage output depth so as to prevent the energy storage SOC from being saturated or exhausted; at the SOC recovery stage, adopting a dynamic SOC recovery base point adjustment method adapting to load changes, then designing an energy storage output determination method considering SOC recovery requirements and power grid bearing capacity, and finally designing a double-layer fuzzy controller to achieve the determination of a dynamic SOC base point value and an energy storage output value. The method has the advantages of being scientific, reasonable, being high in applicability, being capable of guaranteeing the frequency modulation effect and the state of the energy storage SOC, being capable of maintaining the long-term stable output of energy storage and the like.

Description

technical field [0001] The invention relates to a power system frequency modulation control method, which is an energy storage primary frequency modulation control method based on dynamic droop coefficient and SOC recovery base point (Dynamic Droop Coefficient and Dynamic Reference of SOC, DDC&DRSOC). Background technique [0002] In the existing technology, the wind turbine itself of wind power is decoupled from the frequency of the power system, and the replacement of traditional units by high-proportion wind turbines will lead to weakened system inertia and reduced primary frequency regulation capability; in addition, the randomness and volatility of wind power in large-scale It is more prominent when connected to the grid, which will bring greater power disturbance to the grid. Therefore, under such double pressure, it is urgent to use new frequency modulation means to make up for the lack of the next frequency modulation capability of the traditional method. In compari...

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Problems solved by technology

The research on energy storage control methods in the prior art mainly has the following two problems: ①Management of SOC is mostly focused on the adjustment of frequency modulation tasks undertaken by energy storage, but fails to make full use of the frequency modulation dead zone to maintain SOC on this basis. ② Most of the research related to SOC self-recovery is based on 0.5, and there is a lack of a SOC recovery benchmark determination method that can adapt to SOC recovery requirements and load changes

So far, there are no literature reports and practical applications on the energy storage primary frequency modulation control method based on dynamic droop coefficient and SOC recovery base point

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