Power control method for composite energy storage system of energy internet

Abstract

The invention belongs to the technical field of energy control, and relates to a power control method for a composite energy storage system of an energy internet. According to the power control method, first a fluctuant power signal is decomposed into a linear combination of a series of atom signals through atom decomposition, and then a cut-off frequency is set to reconstruct the decomposed linear signals into a high-frequency component, an intermediate-frequency component and a low-frequency component as given power of three energy storage devices. The power control method has the beneficial effects that a multi-time scale energy management strategy based on sine atom oscillation simultaneously proposed by the invention realizes reasonable allocation of the fluctuating power among the three energy storage devices; the energy storage system and the control method consider physical characteristics and limitation of different energy storage devices, delay and disadvantage avoiding are achieved by optimized combination, and the overall efficiency-cost ratio of the energy storage system is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of energy control, and relates to a power control method for a composite energy storage system of the Energy Internet. Background technique [0002] The Energy Internet is a future-oriented energy supply infrastructure, which can realize the production, conversion, storage and consumption of safer and economical clean energy, thereby greatly improving the efficiency of comprehensive energy utilization and supporting the development of a sustainable ecological civilization society. In the Energy Internet, the production, transmission and consumption of energy are integrated, and new energy such as wind power and photovoltaic power generation is used as the main energy source. How to realize the active consumption and comprehensive utilization of new energy has become one of the primary problems to be solved by the Energy Internet. Energy storage technology can effectively control the uncertainty of clean powe...

AI Technical Summary

Problems solved by technology

[0004] In the hybrid energy storage system, how to increase the life of the energy storage device as much as possible and reduce the cost of energy storage is an important issue under the premise of ensuring the stabilization effect. Second, how to formulate an appropriate coordinated control strategy according to the response characteristics of different energy storage devices is another difficult problem in controlling hybrid energy storage systems, especially in the energy Internet where there are a large number of random, nonlinear, and unstable renewable energy sources. Fluctuation, the traditional low-pass filter decomposition has spectrum aliasing, and it is difficult to accurately extract its characteristics, especially when the types of energy storage devices increase, multiple filter functions are required, which will further increase the filter error

Images