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, which is characterized in that the energy storage frequency modulation process is divided into a frequency modulation phase and an SOC recovery phase by taking the power grid frequency modulation dead zone as a division boundary. In the frequency modulation stage, the SOC and the maximum frequency deviation are used as the control amount to adaptively adjust the output depth of the energy storage to prevent the saturation or depletion of the energy storage SOC; Considering the energy storage output determination method of SOC restoration demand and grid capacity, a double-layer fuzzy controller is finally designed to realize dynamic SOC base point value and energy storage output value determination. It is scientific and reasonable, and has strong applicability. It can not only ensure the frequency modulation effect, but also ensure the state of the energy storage SOC, and can maintain the long-term stable output of the energy storage.

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...

AI Technical Summary

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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