A method for improving and tracking the output characteristics of photovoltaic power generation based on hydrogen and battery hybrid energy storage

Abstract

The invention discloses a method of improving tracking photovoltaic power generation output characteristics based on hydrogen and battery hybrid energy storage. The method comprises the steps of: S100, formulating a next-day photovoltaic output plan according to the short-term photovoltaic prediction power, and correcting the next-day photovoltaic output plan according to the SOC of an energy storage battery at night of the day, S200, dividing scheduling modes into main scheduling and coordinated scheduling according to the SOC of the energy storage battery, selecting a different scheduling mode according to the state of charge interval of the SOC of the energy storage battery in real-time scheduling, and tracking the photovoltaic planned output, and S300, taking the photovoltaic output plan as the premise by next-day scheduling and controlling a hydrogen electrolysis cell and the energy storage battery for charge and discharge according to the scheduling mode. The method can perform flexible switching between a main scheduling scheme and a coordinated scheduling scheme, realizes accurate tracking of photovoltaic planned output, reduces fluctuation of grid-connected input power ofa photovoltaic power station, relieves frequency modulation pressure of a system unit, and improves the utilization rate of light energy.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation and energy storage, and specifically relates to a method for improving and tracking the output characteristics of photovoltaic power generation based on hydrogen and battery hybrid energy storage. Background technique [0002] With the shortage of global oil resources, the greenhouse effect, air pollution and other problems, countries strongly advocate people to save energy and reduce emissions. Photovoltaic power generation, as a new energy power generation technology, has attracted the attention of various countries in recent years, and its installed capacity is also increasing day by day. However, photovoltaic power generation also has obvious disadvantages, because its output is greatly affected by weather factors, ambient temperature, light intensity, etc., resulting in intermittent and fluctuating characteristics of its output. The integration of a large number of phot...

AI Technical Summary

Problems solved by technology

However, in actual operation, due to a series of limitations of the energy storage system itself, there will be situations where the energy storage system cannot fully compensate. The more times this happens, the worse the tracking effect will be.

[0004] At present, scholars at home and abroad have done a lot of work on energy storage technology to improve the output characteristics of photovoltaic projects in terms of energy storage capacity allocation and economic optimization of photovoltaic power plants, but most of their research has focused on a single energy storage technology level. There are very few researches on the combination of multiple hybrid energy storage technologies

Moreover, in the existing research methods, although the relationship between the life of the energy storage battery and the SOC is considered, the SOC limit when the energy storage battery can function for a long time is not considered, it is very likely that the energy storage battery has just been put into use for a short period of time. Finally, the energy storage battery was forced to shut down because the SOC exceeded the limit, which caused the photovoltaic output to seriously deviate from the photovoltaic planned output.

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