Hybrid energy storage control method

Abstract

The invention relates to a hybrid energy storage control method. Power control of smooth fluctuation is carried out on a micro-grid system which is composed of hybrid energy storage and distributed power supply; the hybrid energy storage is a hybrid energy storage system which is composed of a super capacitor and a storage battery; the distributed power supply is wind power; in the hybrid energy storage control method, the output power of the distributed power supply is subjected to fourier transform to obtain a power fluctuation spectrogram; and respective power of the super capacitor and the storage battery is determined through second-order low-pass filtering as reference values of constant power control of the energy storage system, so that smooth control on output power of a grid-connected connecting line of a micro-grid system is achieved. According to the hybrid energy storage control method, reference power after second-order low-pass filtering can be further corrected, so that smooth fluctuation power control on hybrid energy storage is achieved on the basis of charge and discharge power imitation of the battery.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a hybrid energy storage control method. Background technique [0002] Wind power generation is one of the important components to realize the sustainable development strategy of energy and electric power in our country. Due to the strong volatility and randomness of wind power output power, and certain errors in wind speed prediction, large-scale wind power grid integration will bring a series of technical difficulties to the safe and stable operation of the power system. [0003] In order to use renewable energy more efficiently, in an environment with abundant wind energy resources, energy storage technology is used to regulate the output power of wind turbines to improve the grid-connected operation capacity of wind farms; that is, to generate electricity by building a wind-storage complementary system can Improve the continuity, stability and reliability of the system power sup...

AI Technical Summary

Problems solved by technology

Due to the limitations of the above shortcomings, it is difficult for a single type of energy storage system to meet the requirements of distributed power generation such as wind power and micro-grid. Therefore, it is necessary to combine two or more types of energy storage devices to form a hybrid energy storage system to achieve technological complementarity.

Images