Complementary optimization control method among multiple hybrid energy storage devices in energy storage system

Abstract

The embodiment of the invention relates to a complementary optimization control method among multiple hybrid energy storage devices in an energy storage system. The multiple energy storage devices are different types of energy storage devices; and the complementary optimization control method comprises the following steps: establishing dynamic and steady mathematical models for the multiple energy storage devices; establishing capacity optimization object functions on the basis of the mathematical models, and carrying out online monitoring on the charge states of the multiple energy storage devices, so as to obtain the load power shortage probability of a system; establishing optimization constraint conditions of the capacity optimization object functions according to the load power shortage probability of the system, so as to carry out optimal configuration on the capacities of various energy storage devices; and separating the load power of the energy storage system on the basis of different frequency components, and distributing the separated load power corresponding to different frequency components to the multiple energy storage devices for undertaking respectively, so as to carry out optimal configuration on the power of the energy storage devices.

Description

technical field [0001] The invention relates to the technical field of new energy power generation and energy storage, in particular to a complementary optimization control method among multiple hybrid energy storage devices in an energy storage system. Background technique [0002] An energy storage device is added to the photovoltaic power generation system with renewable energy to bear the power difference caused by fluctuations in the photovoltaic power supply, and decouple the power between the photovoltaic power generation unit and the grid, thereby stabilizing the power output of the intermittent photovoltaic power supply. Reduce the impact on sensitive loads and power grids. More importantly, when the system is in off-grid operation mode, it can provide voltage and frequency support for the system and improve system stability. Therefore, the rational use of energy storage devices is crucial to the economical, safe and reliable operation of photovoltaic and other ren...

AI Technical Summary

Problems solved by technology

However, due to the random fluctuation of the photovoltaic power supply affected by the light intensity and temperature, the instantaneous power of the system is unbalanced, resulting in multiple small cycle charging and discharging of the battery, which significantly deteriorates the charging and discharging working environment of the battery and greatly shortens the service life of the battery. At the same time, due to the premature aging and scrapping of the battery, it has brought serious environmental pollution and increased the investment cost of the system.

[0004] At present, the research on energy storage technology in photovoltaic power generation systems mainly focuses on the research and development of single energy storage technology and charge and discharge control strategies, while there is relatively little research on hybrid energy storage technology in the system, and it is only in the laboratory research stage. In particular, key technologies such as theoretical modeling of hybrid energy storage, capacity optimization matching, and complementary optimal control strategies between different energy storage devices still need further in-depth research.

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