Method and device for determining power and capacity of hybrid energy storage system

Abstract

The invention provides a method and a device for determining power and capacity of a hybrid energy storage system. The method comprises the steps that a hybrid energy storage model of the hybrid energy storage system is established, wherein the hybrid energy storage system comprises functional energy storage and energy type energy storage; the photovoltaic output power and the main frequency rangeare determined according to photovoltaic output data; a plurality of filtering time constants are selected within the main frequency range, and a power fluctuation rate is determined; a confidence degree corresponding to each filtering time constant is determined according to the power fluctuation rate; and according to the filtering time constants and the confidence degrees, the total power andthe capacity of the hybrid energy storage system and the total power and capacity of the functional energy storage and energy type energy storage in the hybrid energy storage system are determined byutilizing the hybrid energy storage model. According to the method, the charge and discharge energy balance of the energy type and power type two-class energy storage systems is taken as a constraint,and the filtering time constants are added to serve as a key variable, so that the characteristics of the two types of batteries are complementary, and the energy storage smooth distributed photovoltaic output fluctuation can be configured according to project requirements.

Description

technical field [0001] The invention relates to the technical field of hybrid energy storage, in particular to a method and device for determining the power and capacity of a hybrid energy storage system. Background technique [0002] With the gradual increase of the installed capacity of distributed photovoltaic power generation in my country, the connection of a large number of distributed photovoltaics to the distribution network poses a huge challenge to the planning and stable operation of the distribution network. Distributed photovoltaic power supply power changes frequently in the short term and large in the long term. The use of energy storage technology can smooth fluctuations in photovoltaic output, which is an important technical means to realize a flexible smart grid. The key bottleneck in the application of energy storage technology is economy. The distributed hybrid energy storage system based on power and energy storage types can make up for the deficiency of...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of lack of consideration of photovoltaic output fluctuations in the current hybrid energy storage technology, the present invention provides a method for determining the power and capacity of a hybrid energy storage system. The method includes:

Images