Multi-element composite energy storage optimal configuration method supporting large-scale renewable energy consumption

Abstract

The invention relates to a multi-element composite energy storage optimal configuration method supporting large-scale renewable energy consumption, and aims at energy storage system application scenes such as smooth output, planned power generation, peak clipping and valley filling and a mixed scene, and researches a supporting source network load storage multi-element coordination ubiquitous scheduling control mode and a control strategy; different types of application scenes and operation control strategies of the energy storage system are considered, and function requirements and architecture design, data interaction, acquisition and function support technologies of the energy storage system are researched. A method for stabilizing wind power / photovoltaic active power fluctuation by using an energy storage system is used for research. According to the characteristics of different types of energy storage equipment, a wind power / photovoltaic active power smooth control method based on wavelet packet decomposition and empirical mode decomposition (EMD) is provided, the relationship between the wavelet packet decomposition level and the stored energy and the relationship between the empirical mode filtering order and the stored energy are researched respectively, and a theoretical basis is provided for dividing multiple types of stored energy.

Description

technical field [0001] The invention belongs to the technical field of energy storage system optimization, in particular to a multi-element composite energy storage optimization configuration method supporting large-scale renewable energy consumption. Background technique [0002] Due to the influence of factors such as climate and geographical environment, wind energy has the characteristics of intermittent and random output, and the direct integration of wind farm output power into the grid will have a relatively large impact on power system stability, grid frequency, power quality, power generation planning and dispatching, etc. The large-scale impact of wind energy seriously restricts the utilization of wind energy and the large-scale development of wind power. Therefore, how to effectively stabilize the output power fluctuation of wind farms has important practical significance. In response to this problem, domestic and foreign scholars have made active research, mainl...

AI Technical Summary

Problems solved by technology

At present, there are mainly two methods of energy storage system capacity configuration commonly used: ① Establish an objective function with the goal of minimizing the capacity of energy storage equipment, and determine the energy storage capacity that meets the requirements. The energy capacity allocation does not consider the impact of the current high energy storage cost on the economics of the photovoltaic / wind power system; ② The objective function is established with the goal of minimizing the cost, considering the constraints of power output and state of charge of the hybrid energy storage device, the given Energy storage system capacity that meets the requirements

The disadvantage of this method is that when calculating the cost of energy storage, it fails to take into account the cost of replacing and maintaining equipment throughout the life cycle

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