Power distribution method for hybrid energy storage system

Abstract

The invention relates to a power distribution method for a hybrid energy storage system, and belongs to the technical field of new energy power generation systems. The method comprises the following steps: generating a fluctuating power signal; performing power distribution on the power signal through a low-pass filter; making response characteristics to reference power of energy storage equipment equivalent by using a power delay equivalent device; calculating the charge state of the energy storage equipment through an energy storage equipment charge state calculation device; judging and controlling the working state of the energy storage equipment by adopting a time constant comprehensive judgment device to obtain a corresponding variable low-pass filter time constant to adjust the power distribution. The power distribution strategy for the hybrid energy storage system based on the variable filter time constant of an energy storage equipment charge state disclosed by the invention has the function of changing the filter time constant of the low-pass filter in real time, and has the advantages of reducing the change range of the energy storage equipment charge state, slowing the saturation or the depletion of the energy storage equipment charge state to a certain degree, prolonging the service life of the energy storage equipment and the like.

Description

technical field [0001] The invention relates to a power distribution method of a hybrid energy storage system, in particular to a power distribution method of a hybrid energy storage system based on a variable filter time constant of the state of charge, and belongs to the technical field of new energy power generation systems. Background technique [0002] As we all know, due to the intermittent and random characteristics of the output power of the photovoltaic power generation system, the increase in the energy penetration rate of the photovoltaic power generation system has brought a great impact on the power grid, which has a negative impact on the quality of electric energy and the stability of the system. . Equipped with energy storage devices with a certain capacity, the power fluctuations in the main power grid can be stabilized to a certain extent. The energy storage devices mainly used at this stage mainly include energy-type energy storage components and power-typ...

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Problems solved by technology

Although the power distribution strategy of this hybrid energy storage system realizes the most ideal situation in the power distribution of the hybrid energy storage system, due to the limited energy storage capacity of lithium batteries and supercapacitors, lithium batteries and supercapacitors are prone to overcharge and overdischarge. Cause damage to energy storage equipment, which is not conducive to engineering applications

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