Control method for battery energy storage system combining energy type and power type

Abstract

The invention relates to a control method for a battery energy storage system combining an energy type and a power type. Four key nodes are chosen so that a variation section of a state of charge (SOC) of the battery energy storage system is determined. SOC up to SOC max is an urgent charging section, SOC down to SOC up is an energy free transportation section and SOC down to SOC min is an urgent discharging section. When large power disturbance occurs in a located outer environment, the battery energy storage system always can preferably offer a rapid charging or discharging urgent power control function; and when the outer environment operates normally and the battery energy storage system is in the energy free transportation section, a charging state and a discharging state can be freely controlled according to outer environment requirements, when the battery energy storage system is in the urgent charging section, only discharge is allowed and when the battery energy storage system is in the urgent discharging section, only charge is allowed. According to the control method for the battery energy storage system, two functions of energy transportation and power urgent control can be integrated in one energy storage system, so that system device investment is reduced, device using rate is improved and economic benefit is good.

Description

technical field [0001] The invention relates to the field of electric power using a battery energy storage system, in particular to a control method for a battery energy storage system that takes both energy and power into account. Background technique [0002] Distributed power generation generally refers to a miniaturized, modularized, decentralized, small power generation system connected to the power distribution system with a generating power of several thousand watts to 50 megawatts. It is usually arranged near the user to supply power to the user. Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. It is an autonomous system capable of self-control, protection and management, which can be operated in parallel with the large power grid or isolated. Existing research and practice show that microgrid is the most ...

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the above-mentioned existing independently configured and separately controlled battery energy storage systems still have inconveniences and defects, and need to be further improved.

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